LT1490A, LT491A Datasheet by Analog Devices Inc.

L7 LI” LT1490A LT1491A TECHNOLOGY —>I— | 'HIIII: M L7 LJUW
LT1490A/LT1491A
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TYPICAL APPLICATION
FEATURES DESCRIPTION
Dual/Quad Over-The-Top
Micropower Rail-to-Rail
Input and Output Op Amps
The LT
®
1490A/LT1491A are dual and quad op amps with a
low input offset voltage of 500µV max. The LT1490A/LT1491A
operate on all single and split supplies with a total voltage of
2V to 44V, drawing only 40µA of quiescent current per ampli-
fier. These amplifiers are reverse supply protected; they draw
virtually no current for reverse supply up to 18V. The input
range of the LT1490A/LT1491A includes both supplies and
the output swings to both supplies. Unlike most micropower
op amps, the LT1490A/LT1491A can drive heavy loads; their
rail-to-rail outputs drive 20mA. The LT1490A/LT1491A are
unity-gain stable and drive all capacitive loads up to 10,000pF
when optional 0.22µF and 150 compensation is used.
The LT1490A/LT1491A have a unique input stage that oper-
ates and remains high impedance when above the positive
supply. The inputs take 44V both differential and common
mode even when operating on a 3V supply. Built-in resistors
protect the inputs for faults below the negative supply up to
15V. There is no phase reversal of the output for inputs 15V
below V– or 44V above V–, independent of V+.
The LT1490A dual op amp is available in the 8-pin MSOP, PDIP
and SO packages. For space limited applications LT1490A is
available in a 3mm × 3mm × 0.8mm, dual fine pitch leadless
package (DFN). The quad LT1491A is available in the 14-pin
SO, PDIP and 5mm × 3mm × 0.8mm DFN packages.
Battery Monitor
APPLICATIONS
n Low Input Offset Voltage: 500μV Max
n Output Swings to 10mV Max from V–
n Rail-to-Rail Input and Output
n Micropower: 50μA/Amplifier Max
n Over-The-Top
®
Input Common Mode Range Extends
44V Above V–, Independent of V+
n Specified on 3V, 5V and ±15V Supplies
n High Output Current: 20mA
n Output Drives 10,000pF with Output Compensation
n Reverse Battery Protection to 18V
n No Supply Sequencing Problems
n High Voltage Gain: 1500V/mV
n High CMRR: 98dB
n No Phase Reversal
n Gain Bandwidth Product: 200kHz
n Tiny 3mm × 3mm × 0.8mm DFN Package
n Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
n Supply Current Sensing
n Battery Monitoring
n Micropower Active Filters
n 4mA to 20mA Transmitters L, LT, LTC, LTM, Over-The-Top, Linear Technology and the Linear logo are registered
trademarks of Linear Technology Corporation. All other trademarks are the property of their
respective owners. Protected by U.S. Patents including 5825228.
–
+
–
+
RA
2k
Q2
2N3904
S1
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
RA = RB
VS = 5V, 0V
10k 90.9k
VOUT
LOGIC
1490A TA01
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
RG
10k
Q1
2N3904
RS
0.2
CHARGER
VOLTAGE
1/4 LT1491A
1/4 LT1491A
RA´
2k
RB
2k
VBATT = 12V
IBATT
+
RB´
2k
LOAD
–
+
–
+
VOUT
(RS)(RG/RA)(GAIN)
VOUT
GAIN
IBATT = = AMPS
1/4 LT1491A
1/4 LT1491A
j j j j E E E E ] j 3 ] 9% E E I: I: LT1490A/LT1491A L7LJCUEN2
LT1490A/LT1491A
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LT1490A LT1490A LT1490A
1
2
3
4
OUT A
–IN A
+IN A
V–
8
7
6
5
V+
OUT B
–IN B
+IN B
TOP VIEW
MS8 PACKAGE
8-LEAD PLASTIC MSOP
A
B
TJMAX = 150°C, θJA = 250°C/W
1
2
3
4
8
7
6
5
TOP VIEW
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
V+
OUT B
–IN B
+IN B
A
B
OUT A
–IN A
+IN A
V–
TJMAX = 150°C, θJA = 130°C/W (N8)
TJMAX = 150°C, θJA = 190°C/W (S8)
TOP VIEW
DD PACKAGE
8-LEAD (3mm w 3mm) PLASTIC DFN
5
6
7
8
4
3
2
1OUT A
–IN A
+IN A
V–
V+
OUT B
–IN B
+IN B
A
B
TJMAX = 125°C, θJA = 160°C/W (NOTE 2)
UNDERSIDE METAL CONNECTED TO V–
LT1491A LT1491A
TOP VIEW
S PACKAGE
14-LEAD PLASTIC SO
N PACKAGE
14-LEAD PDIP
1
2
3
4
5
6
7
14
13
12
11
10
9
8
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
AD
BC
TJMAX = 150°C, θJA = 110°C/W (N)
TJMAX = 150°C, θJA = 150°C/W (S)
16
15
14
13
12
11
10
9
1
2
3
4
5
6
7
8
OUT D
–IN D
+IN D
V–
+IN C
–IN C
OUT C
NC
OUT A
–IN A
+IN A
V+
+IN B
–IN B
OUT B
NC
TOP VIEW
DHC16 PACKAGE
16-LEAD (5mm w 3mm) PLASTIC DFN
AD
BC
TJMAX = 125°C, θJA = 160°C/W (NOTE 2)
UNDERSIDE METAL CONNECTED TO V–
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V+ to V–) ............................... 44V
Differential Input Voltage ......................................... 44V
Input Current (Note 9) ......................................... ±12mA
Output Short-Circuit Duration (Note 2) ........ Continuous
Operating Temperature Range (Note 3)
LT1490AC/LT1491AC ...........................–40°C to 85°C
LT1490AI/LT1491AI .............................–40°C to 85°C
LT1490AH/LT1491AH ......................... –40°C to 125°C
(Note 1)
PIN CONFIGURATION
Specified Temperature Range (Note 4)
LT1490AC/LT1490AI ............................–40°C to 85°C
LT1491AC/LT1491AI .............................–40°C to 85°C
LT1490AH/LT1491AH ......................... –40°C to 125°C
Junction Temperature .......................................... 150°C
Junction Temperature (DD/DHC Package) ........... 125°C
Storage Temperature Range ................. –65°C to 150°C
Storage Temperature Range
DD/DHC Package .............................. –65°C to 125°C
Lead Temperature (Soldering, 10 sec) .................. 300°C
LT1490A/LT1491A L7 LJUW
LT1490A/LT1491A
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ORDER INFORMATION
LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE
LT1490ACMS8#PBF LT1490ACMS8#TRPBF LTNG 8-Lead Plastic MSOP 0°C to 70°C
LT1490AIMS8#PBF LT1490AIMS8#TRPBF LTPU 8-Lead Plastic MSOP –40°C to 85°C
LT1490AHMS8#PBF LT1490AHMS8#TRPBF LTRK 8-Lead Plastic MSOP –40°C to 125°C
LT1490ACS8#PBF LT1490ACS8#TRPBF 1490A 8-Lead Plastic SO 0°C to 70°C
LT1490AIS8#PBF LT1490AIS8#TRPBF 1490AI 8-Lead Plastic SO –40°C to 85°C
LT1490AHS8#PBF LT1490AHS8#TRPBF 1490AH 8-Lead Plastic SO –40°C to 125°C
LT1490ACN8#PBF LT1490ACN8#TRPBF LT1490ACN8 8-Lead PDIP 0°C to 70°C
LT1490AIN8#PBF LT1490AIN8#TRPBF LT1490AIN8 8-Lead PDIP –40°C to 85°C
LT1490ACDD#PBF LT1490ACDD#TRPBF LAAH 8-Lead (3mm × 3mm) Plastic DFN 0°C to 70°C
LT1490AIDD#PBF LT1490AIDD#TRPBF LAAH 8-Lead (3mm × 3mm) Plastic DFN –40°C to 85°C
LT1491ACS#PBF LT1491ACS#TRPBF LT1491ACS 14-Lead Plastic SO 0°C to 70°C
LT1491AIS#PBF LT1491AIS#TRPBF LT1491AIS 14-Lead Plastic SO –40°C to 85°C
LT1491AHS#PBF LT1491AHS#TRPBF LT1491AHS 14-Lead Plastic SO –40°C to 125°C
LT1491ACN#PBF LT1491ACN#TRPBF LT1491ACN 14-Lead PDIP 0°C to 70°C
LT1491AIN#PBF LT1491AIN#TRPBF LT1491AIN 14-Lead PDIP –40°C to 85°C
LT1491ACDHC#PBF LT1491ACDHC#TRPBF 1491A 16-Lead (5mm × 3mm) Plastic DFN 0°C to 70°C
LT1491AIDHC#PBF LT1491AIDHC#TRPBF 1491A 16-Lead (5mm × 3mm) Plastic DFN –40°C to 85°C
Consult LTC Marketing for parts specified with wider operating temperature ranges. *The temperature grade is identified by a label on the shipping container.
Consult LTC Marketing for information on non-standard lead based finish parts.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/
LT1490A/LT1491A
LT1490A/LT1491A
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ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply
unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1490AC/LT1491AC
LT1490AI/LT1491AI
UNITSMIN TYP MAX
VOS Input Offset Voltage (Note 5) LT1490A N, S Packages
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
110 500
700
800
µV
µV
µV
LT1490A MS8 Package, LT1491A N, S Packages
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
220 1000
1200
1400
µV
µV
µV
LT1490A DD, LT1491A DHC
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
250 1200
1400
1600
µV
µV
µV
Input Offset Voltage Drift (Note 9) –40°C ≤ TA ≤ 85°C
LT1490A DD, LT1491A DHC, –40°C ≤ TA ≤ 85°C
l
l
2
2
4
6
µV/°C
µV/°C
IOS Input Offset Current
VCM = 44V (Note 6)
l
l
0.2 0.8
0.8
nA
µA
IBInput Bias Current
VCM = 44V (Note 6)
VS = 0V
l
l
1
3
0.3
8
10
nA
µA
nA
Input Bias Current Drift –40°C ≤ TA ≤ 85°C l2 pA/°C
Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P
enInput Noise Voltage Density f = 1kHz 50 nV/√Hz
inInput Noise Current Density f = 1kHz 0.015 pA/√Hz
RIN Input Resistance Differential
Common Mode, VCM = 0V to 44V
6
4
17
11
MΩ
MΩ
CIN Input Capacitance 4.6 pF
Input Voltage Range l044V
CMRR Common Mode Rejection Ratio
(Note 6)
VCM = 0V to VCC – 1V
VCM = 0V to 44V
l
l
84
80
98
98
dB
dB
AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
200
133
100
1500 V/mV
V/mV
V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
400
250
200
1500 V/mV
V/mV
V/mV
VOL Output Voltage Swing Low VS = 3V, No Load
VS = 3V, ISINK = 5mA
l
l
3
250
10
450
mV
mV
VS = 5V, No Load
VS = 5V, ISINK = 5mA
VS = 5V, ISINK = 10mA
l
l
3
250
330
10
500
500
mV
mV
mV
VOH Output Voltage Swing High VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
l
l
2.95
2.55
2.978
2.6
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
l
l
4.95
4.30
4.978
4.6
V
V
ISC Short-Circuit Current (Note 2) VS = 3V, Short to GND
VS = 3V, Short to VCC
10
10
15
30
mA
mA
VS = 5V, Short to GND
VS = 5V, Short to VCC
15
15
25
30
mA
mA
LT1490A/LT1491A L7 LJUW
LT1490A/LT1491A
5
14901afd
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating
temperature range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply
unless otherwise noted. (Note 4)
The ● denotes specifications which apply over the full operating temperature range of – 40°C ≤ TA ≤ 85°C, otherwise specifications are
at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1490AC/LT1491AC
LT1490AI/LT1491AI
UNITSMIN TYP MAX
PSRR Power Supply Rejection Ratio VS = 2.5V to 12.5V, VCM = VO = 1V l84 98 dB
Minimum Operating Supply Voltage l2 2.5 V
Reverse Supply Voltage IS = –100µA per Amplifier l18 27 V
ISSupply Current per Amplifier
(Note 7) l
40 50
55
µA
µA
GBW Gain Bandwidth Product
(Note 6)
f = 1kHz
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
110
100
90
180 kHz
kHz
kHz
SR Slew Rate
(Note 8)
AV = –1, RL = ∞
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
0.035
0.031
0.030
0.06 V/µs
V/µs
V/µs
SYMBOL PARAMETER CONDITIONS
LT1490AC/LT1491AC
LT1490AI/LT1491AI
UNITSMIN TYP MAX
VOS Input Offset Voltage (Note 5) LT1490A N, S Packages
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
150 700
950
1100
µV
µV
µV
LT1490A MS8 Package, LT1491A N, S Packages
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
250 1200
1350
1500
µV
µV
µV
LT1490A DD, LT1491A DHC
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
285 1400
1550
1700
µV
µV
µV
Input Offset Voltage Drift (Note 9) –40°C ≤ TA ≤ 85°C
LT1490A DD, LT1491A DHC, –40°C ≤ TA ≤ 85°C
l
l
2
2
6
7
µV/°C
µV/°C
IOS Input Offset Current l0.2 0.8 nA
IBInput Bias Current l18 nA
Input Bias Current Drift –40°C ≤ TA ≤ 85°C l5 pA/°C
Input Noise Voltage 0.1Hz to 10Hz 1 µVP-P
enInput Noise Voltage Density f = 1kHz 50 nV/√Hz
inInput Noise Current Density f = 1kHz 0.015 pA/√Hz
RIN Input Resistance Differential
Common Mode, VCM = –15V to 14V
617
15000
MΩ
MΩ
CIN Input Capacitance 4.6 pF
Input Voltage Range l–15 29 V
CMRR Common Mode Rejection Ratio VCM = –15V to 29V l80 98 dB
AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
100
75
50
250 V/mV
V/mV
V/mV
VOOutput Voltage Swing No Load
IOUT = ±5mA
IOUT = ±10mA
l
l
±14.9
±14.5
±14.5
±14.978
±14.750
±14.670
V
V
V
LT1490A/LT1491A
LT1490A/LT1491A
6
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ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 85°C, otherwise specifications are at TA = 25°C. VS = ±15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
The ● denotes specifications which apply over the full operating temperature range of –40°C ≤ TA ≤ 125°C, VS = 3V, 0V; VS = 5V, 0V;
VCM = VOUT = half supply unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1490AC/LT1491AC
LT1490AI/LT1491AI
UNITSMIN TYP MAX
ISC Short-Circuit Current (Note 2) Short to GND
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
±20
±15
±10
±25 mA
mA
mA
PSRR Power Supply Rejection Ratio VS = ±1.25V to ±22V l88 98 dB
ISSupply Current per Amplifier
l
50 70
85
µA
µA
GBW Gain Bandwidth Product f = 1kHz
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
125
110
100
200 kHz
kHz
kHz
SR Slew Rate AV = –1, RL = ∞, VO = ±10V,
Measured at VO = ±5V
0°C ≤ TA ≤ 70°C
–40°C ≤ TA ≤ 85°C
l
l
0.0375
0.0330
0.0300
0.07 V/µs
V/µs
V/µs
SYMBOL PARAMETER CONDITIONS
LT1490AH/LT1491AH
UNITSMIN TYP MAX
VOS Input Offset Voltage (Note 5) LT1490AHS8
l
110 500
2500
µV
µV
LT1490AHMS8, LT1491AHS
l
220 1000
3000
µV
µV
Input Offset Voltage Drift (Note 9) l3 6 µV/°C
IOS Input Offset Current
VCM = 44V (Note 6)
l
l
2
1.5
nA
µA
IBInput Bias Current
VCM = 44V (Note 6)
l
l
20
15
nA
µA
Input Voltage Range l0.3 44 V
CMRR Common Mode Rejection Ratio
(Note 6)
VCM = 0.3V to VCC –1V
VCM = 0.3V to 44V
l
l
60
74
dB
dB
AVOL Large-Signal Voltage Gain VS = 3V, VO = 500mV to 2.5V, RL = 10k
l
200
25
1500 V/mV
V/mV
VS = 5V, VO = 500mV to 4.5V, RL = 10k
l
400
50
1500 V/mV
V/mV
VOL Output Voltage Swing Low VS = 3V, No Load
VS = 3V, ISINK = 2.5mA
l
l
15
450
mV
mV
VS = 5V, No Load
VS = 5V, ISINK = 2.5mA
l
l
15
500
mV
mV
VOH Output Voltage Swing High VS = 3V, No Load
VS = 3V, ISOURCE = 5mA
l
l
2.925
2.350
V
V
VS = 5V, No Load
VS = 5V, ISOURCE = 10mA
l
l
4.925
4.100
V
V
PSRR Power Supply Rejection Ratio VS = 2.5V to 12.5V, VCM = VO = 1V l80 dB
Minimum Operating Supply Voltage l2.5 V
Reverse Supply Voltage IS = –100µA per Amplifier l18 V
LT1490A/LT1491A L7 LJUW
LT1490A/LT1491A
7
14901afd
ELECTRICAL CHARACTERISTICS
The ● denotes specifications which apply over the full operating temperature
range of –40°C ≤ TA ≤ 125°C. VS = ±15V, VCM = 0V, VOUT = 0V unless otherwise noted. (Note 4)
SYMBOL PARAMETER CONDITIONS
LT1490AH/LT1491AH
UNITSMIN TYP MAX
ISSupply Current per Amplifier (Note 7)
l
40 50
70
µA
µA
GBW Gain Bandwidth Product (Note 6) f = 1kHz
l
110
60
180 kHz
kHz
SR Slew Rate (Note 8) AV = –1, RL = ∞
l
0.035
0.015
0.06 V/µs
V/µs
VOS Input Offset Voltage (Note 5) LT1490AHS8
l
150 700
2700
µV
µV
LT1490AHMS8, LT1491AHS
l
250 1200
3200
µV
µV
Input Offset Voltage Drift (Note 9) l3 7 µV/°C
IOS Input Offset Current l2nA
IBInput Bias Current l20 nA
Input Voltage Range l–14.7 29 V
CMRR Common Mode Rejection Ratio VCM = –14.7V to 29V l72 dB
AVOL Large-Signal Voltage Gain VO = ±14V, RL = 10k
l
100
4
250 V/mV
V/mV
VOOutput Voltage Swing No Load
IOUT = ±2.5mA
l
l
±14.8
±14.3
V
V
PSRR Power Supply Rejection Ratio VS = ±1.25V to ±22V l84 dB
ISSupply Current per Amplifier
l
50 70
95
µA
µA
GBW Gain Bandwidth Product f = 1kHz
l
125
75
200 kHz
kHz
SR Slew Rate AV = –1, RL = ∞
l
0.0375
0.02
0.07 V/µs
V/µs
Note 1: Stresses beyond those listed under Absolute Maximum Ratings
may cause permanent damage to the device. Exposure to any Absolute
Maximum Rating condition for extended periods may affect device
reliability and lifetime.
Note 2: A heat sink may be required to keep the junction temperature
below absolute maximum. This depends on the power supply voltage and
how many amplifi ers are shorted. The θJA specifi ed for the DD and DHC
package is with minimal PCB heat spreading metal. Using expanded metal
area on all layers of a board reduces this value.
Note 3: The LT1490AC/LT1491AC and LT1490AI/LT1491AI are guaranteed
functional over the operating temperature range of –40°C to 85°C.
The LT1490AH/LT1491AH are guaranteed functional over the operating
temperature range of –40°C to 125°C.
Note 4: The LT1490AC/LT1491AC are guaranteed to meet specifi ed
performance from 0°C to 70°C. The LT1490AC/LT1491AC are designed,
characterized and expected to meet specifi ed performance from
–40°C to 85°C but are not tested or QA sampled at these temperatures.
The LT1490AI/LT1491AI are guaranteed to meet specifi ed performance
from –40°C to 85°C. The LT1490AH/LT1491AH are guaranteed to meet
specifi ed performance from – 40°C to 125°C.
Note 5: ESD (electrostatic discharge) sensitive device. Extensive use
of ESD protection devices are used internal to the LT1490A/LT1491A.
However, high electrostatic discharge can damage or degrade the device.
Use proper ESD handling precautions.
Note 6: VS = 5V limits are guaranteed by correlation to VS = 3V and
VS = ±15V tests.
Note 7: VS = 3V limits are guaranteed by correlation to VS = 5V and
VS = ±15V tests.
Note 8: Guaranteed by correlation to slew rate at VS = ±15V and GBW
at VS = 3V and VS = ±15V tests.
Note 9: This parameter is not 100% tested.
LT1490A/LT1491A L7LJCUEN2
LT1490A/LT1491A
8
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TYPICAL PERFORMANCE CHARACTERISTICS
Output Saturation Voltage
vs Load Current (Output High)
Output Saturation Voltage
vs Load Current (Output Low)
Output Saturation Voltage
vs Input Overdrive
0.1Hz to 10Hz Noise Voltage
Noise Voltage Density
vs Frequency Input Noise Current vs Frequency
Supply Current vs Supply Voltage Minimum Supply Voltage
Input Bias Current
vs Common Mode Voltage
TOTAL SUPPLY VOLTAGE (V)
0
0
SUPPLY CURRENT PER AMPLIFIER (µA)
10
30
40
50
70
10 20 25 45
1490A G01
20
80
60
515 30 35 40
TA = 125°C
TA = 25°C
TA = –55°C
TOTAL SUPPLY VOLTAGE (V)
0
CHANGE IN INPUT OFFSET VOLTAGE (µV)
200
400
4
1490A G02
0
–200
100
300
–100
–300
–400 1235
TA = 25°C
TA = 125°C
TA = –55°C
COMMON MODE VOLTAGE (V)
4.0–0.4 0
INPUT BIAS CURRENT (nA)
5000
3000
1000
30
20
10
0
–10 5.6
1490A G03
4.4 4.8 5.2 44
TA = –55°C
TA = 25°C
TA = 125°C
VS = 5V, 0V
SOURCING LOAD CURRENT (A)
1µ
OUTPUT SATURATION VOLTAGE (V)
100m
10m
1490A G04
10m 10µ 100µ 1m 100m
1
TA = 125°C
VS = 5V, 0V
TA = 25°C
TA = –55°C
SINKING LOAD CURRENT (A)
0.1µ
1m
OUTPUT SATURATION VOLTAGE (V)
10m
100m
1
1µ 10µ 100µ 1m
1490A G05
10m 100m
TA = 125°C
VS = 5V, 0V
TA = 25°C
TA = –55°C
INPUT OVERDRIVE (mV)
0
OUTPUT SATURATION VOLTAGE (mV)
60
80
100
40
1490A G06
40
20
50
70
90
30
10
010 20 30 50
OUTPUT HIGH
OUTPUT LOW
VS = 5V, 0V
NO LOAD
TIME (SEC)
NOISE VOLTAGE (400nV/DIV)
2468
1490A G07
10103579
VS = ±2.5V
FREQUENCY (Hz)
1
40
INPUT NOISE VOLTAGE DENSITY (nV/√Hz)
60
80
100
10 100 1k
1490A G08
20
120
FREQUENCY (Hz)
1
INPUT NOISE CURRENT DENSITY (pA/√Hz)
10 100 1k
1490A G09
0.20
0.25
0.30
0.35
0.15
0.10
0.05
0
LT1490A/LT1491A R‘SWQ v5 FALLING v5 = :‘5v L7 LJUW
LT1490A/LT1491A
9
14901afd
TYPICAL PERFORMANCE CHARACTERISTICS
Gain Bandwidth Product and
Phase Margin vs Supply Voltage CMRR vs Frequency PSRR vs Frequency
Gain Bandwidth Product and
Phase Margin vs Load Resistance Channel Separation vs Frequency Output Impedance vs Frequency
Gain and Phase Shift
vs Frequency
Gain Bandwidth Product
vs Temperature Slew Rate vs Temperature
FREQUENCY (kHz)
1
10
GAIN (dB)
PHASE SHIFT (DEG)
20
30
40
50
10 100 1000
1490A G10
0
–10
–20
–30
60
70
–20
0
20
40
60
–40
–60
–80
–100
80
100
VS = ±2.5V
PHASE
GAIN
TEMPERATURE (°C)
–50
GAIN BANDWIDTH PRODUCT (kHz)
120
140
160
260
200
050 75
1490A G11
100
220
240
180
–25 25 100 125
VS = ±15V
VS = ±1.5V
f = 1kHz
TEMPERATURE (°C)
–50
SLEW RATE (V/µs)
050 75
1490A G12
0.04
0.06
0.10
0.12
0.08
–25 25 100 125
RISING, VS = ±15V
RISING, VS = ±1.5V
FALLING, VS = ±1.5V
FALLING, VS = ±15V
TOTAL SUPPLY VOLTAGE (V)
0
150
GAIN BANDWIDTH PRODUCT (kHz)
PHASE MARGIN (DEG)
160
180
190
200
250
220
10 20 25 45
1490A G13
170
230
240
210
10
30
60
20
50
40
515 30 35 40
RL = 10k
f = 1kHz
PHASE MARGIN
GAIN BANDWIDTH
FREQUENCY (kHz)
1
COMMON MODE REJECTION RATIO (dB)
10
120
100
80
60
40
20 100
1490A G14
VS = ±15V
VS = ±1.5V
FREQUENCY (kHz)
1
–20
POWER SUPPLY REJECTION RATIO (dB)
0
20
40
60
10 100
1490A G15
–10
10
30
50
70
80 VS = ±2.5V
POSITIVE SUPPLY
NEGATIVE SUPPLY
LOAD RESISTANCE (k)
1
50
GAIN BANDWIDTH PRODUCT (kHz)
PHASE MARGIN (DEG)
100
150
200
250
350
10 100
1490A G16
300
20
30
40
50
60
80
70
VS = ±2.5V
AV = –1
RF = RG = 100k
f = 1kHz
PHASE MARGIN
GAIN BANDWIDTH
FREQUENCY (kHz)
0.1
90
CHANNEL SEPARATION (dB)
100
110
120
130
1 10 100
1490A G17
80
70
50
40
60
VS = ±15V
FREQUENCY (kHz)
0.1
OUTPUT IMPEDANCE ()
100
1k
10k
1 10 100
1490A G18
10
1
0.1
VS = ±2.5V
AV = 100
AV = 10
AV = 1
LT1490A/LT1491A L7Hߤߤ
LT1490A/LT1491A
10
14901afd
TYPICAL PERFORMANCE CHARACTERISTICS
Total Harmonic Distortion + Noise
vs Frequency
Total Harmonic Distortion + Noise
vs Load Resistance
Total Harmonic Distortion + Noise
vs Output Voltage
Open-Loop Gain Large-Signal Response Small-Signal Response
Undistorted Output Swing
vs Frequency
Settling Time to 0.1%
vs Output Step
Capacitive Load Handling,
Overshoot vs Capacitive Load
FREQUENCY (kHz)
0.1
20
OUTPUT SWING (VP-P)
25
30
35
1 10 100
1490A G19
15
10
5
0
DISTORTION ≤ 1%
VS = ±15V
VS = 5V, 0V
SETTLING TIME (µs)
0
–10
OUTPUT STEP (V)
–8
–4
–2
0
10
4
40 80 100
1490A F20
–6
6
8
2
20 60 120 140 160
VS = ±15V
AV = –1
AV = –1
AV = 1
AV = 1
CAPACITIVE LOAD (pF)
20
OVERSHOOT (%)
40
60
50
80
100
10
30
70
90
10 100 1000 10000
1490A G21
0
VS = 5V, 0V
ISOURCE = 170µA
AV = 1 AV = 2 AV = 5
AV = 10
FREQUENCY (kHz)
0.01
THD + NOISE (%)
0.1
1
10
0.01 1 10
1490A G22
0.001 0.1
VS = 3V, 0V
VOUT = 2VP-P
VCM = 1.2V
RL = 50k
AV = –1
AV = 1
LOAD RESISTANCE TO GROUND (k)
0.01
THD + NOISE (%)
0.1
1
10
0.1 10 100
1490A G23
0.001 1
VS = 3V TOTAL
AV = 1
VIN = 2VP-P AT 1kHz
VS = ±1.5V
VIN = ±1V
VS = 3V, 0V
VIN = 0.5V TO 2.5V
VS = 3V, 0V
VIN = 0.2V TO 2.2V
OUTPUT VOLTAGE (VP-P)
0.01
THD + NOISE (%)
1
10
023
1490A G24
0.001 1
0.1
RL = 10k
VCM = HALF SUPPLY
f = 1kHz
AV = 1
VS = 3V, 0V
AV = –1
VS = 3V, 0V
AV = –1
VS = ±1.5V
AV = 1
VS = ±1.5V
CHANGE IN INPUT OFFSET VOLTAGE
(100µV/DIV)
0V
OUTPUT VOLTAGE (5V/DIV)
10V
RL = 50k
RL = 2k RL = 10k
VS = ±15V
1490A G25
–10V VS = ±15V
AV = –1
1491A G26 VS = ±15V
AV = 1
1491A G27
LT1490A/LT1491A L7 LJUW
LT1490A/LT1491A
11
14901afd
APPLICATIONS INFORMATION
Supply Voltage
The positive supply pin of the LT1490A/LT1491A should
be bypassed with a small capacitor (about 0.01µF) within
an inch of the pin. When driving heavy loads an additional
4.7µF electrolytic capacitor should be used. When using
split supplies, the same is true for the negative supply pin.
The LT1490A/LT1491A are protected against reverse battery
voltages up to 18V. In the event a reverse battery condition
occurs, the supply current is less than 1nA.
The LT1490A/LT1491A can be shut down by removing V+.
In this condition the input bias current is typically less than
0.5nA, even if the inputs are 44V above the negative supply.
When operating the LT1490A/LT1491A on total supplies of
20V or more, the supply must not rise to its final voltage
in less than 1µs. This is especially true if low ESR bypass
capacitors are used. A series RLC circuit is formed from
the supply lead inductance and the bypass capacitor. A
resistance of 7.5 in the supply or in the bypass capacitor
will dampen the tuned circuit enough to limit the rise time.
Inputs
The LT1490A/LT1491A have two input stages, NPN and PNP
(see the Simplified Schematic), resulting in three distinct
operating regions as shown in the Input Bias Current vs
Common Mode typical performance curve.
For input voltages about 0.8V or more below V+, the PNP
input stage is active and the input bias current is typically
–1nA. When the input voltage is about 0.5V or less from
V+, the NPN input stage is operating and the input bias
current is typically 25nA. Increases in temperature will
cause the voltage at which operation switches from the
PNP stage to the NPN stage to move towards V+. The
input offset voltage of the NPN stage is untrimmed and
is typically 600µV.
A Schottky diode in the collector of each NPN transistor of
the NPN input stage allows the LT1490A/LT1491A to operate
with either or both of their inputs above V+. At about 0.3V
above V+ the NPN input transistor is fully saturated and the
input bias current is typically 3µA at room temperature.
The input offset voltage is typically 700µV when operating
above V+. The LT1490A/LT1491A will operate with their
inputs 44V above V– regardless of V+.
The inputs are protected against excursions as much as
15V below V– by an internal 1k resistor in series with
each input and a diode from the input to the negative
supply. There is no output phase reversal for inputs up to
15V below V–. There are no clamping diodes between the
inputs and the maximum differential input voltage is 44V.
Output
The output voltage swing of the LT1490A/LT1491A is
affected by input overdrive as shown in the typical per-
formance curves.
The output of the LT1490A/LT1491A can be pulled up to
18V beyond V+ with less than 1nA of leakage current,
provided that V+ is less than 0.5V.
The normally reverse-biased substrate diode from the
output to V– will cause unlimited currents to flow when
the output is forced below V–. If the current is transient
and limited to 100mA, no damage will occur.
The LT1490A/LT1491A are internally compensated to drive
at least 200pF of capacitance under any output loading
conditions. A 0.22µF capacitor in series with a 150 resis-
tor between the output and ground will compensate these
amplifiers for larger capacitive loads, up to 10,000pF, at
all output currents.
Distortion
There are two main contributors of distortion in op amps:
output crossover distortion as the output transitions
from sourcing to sinking current and distortion caused
by nonlinear common mode rejection. Of course, if the
op amp is operating inverting there is no common mode
induced distortion. When the LT1490A/LT1491A switch
between input stages there is significant nonlinearity in
the CMRR. Lower load resistance increases the output
crossover distortion, but has no effect on the input stage
transition distortion. For lowest distortion the LT1490A/
LT1491A should be operated single supply, with the out-
put always sourcing current and with the input voltage
swing between ground and (V+ – 0.8V). See the Typical
Performance Characteristics curves.
LT1490A/LT1491A L7LJCUEN2
LT1490A/LT1491A
12
14901afd
APPLICATIONS INFORMATION
Gain
The open-loop gain is almost independent of load when
the output is sourcing current. This optimizes performance
in single supply applications where the load is returned
to ground. The typical performance photo of Open-Loop
Gain for various loads shows the details.
TYPICAL APPLICATIONS
SIMPLIFIED SCHEMATIC
Square Wave Oscillator Optional Output Compensation for
Capacitive Loads Greater Than 200pF
–
+
VOUT
1490A TA02
100k
100k
C
0.1µF
VOUT = 5VP-P WITH 5V SUPPLY
IS = 200µA
59k
1/2 LT1490A
5V
R
50k
f = 1
2RC
AT VS = 5V, R = 50k, C = 1nF
OUTPUT IS 5kHz SLEW LIMITED TRIANGLE WAVE
–
+
VIN
1490A TA04
0.22µF
CL ≤ 10,000pF
150
1/2 LT1490A
Q10
D5
Q9
Q1
Q7
R2
1k
R3
1k
R4
40k
Q8
Q5
–IN
+IN
Q11 Q12
D4
ONE AMPLIFIER
D2
Q2
D1
Q6
Q13 Q14
R1
30k
R5
40k
Q4
2µA
+
Q15
Q19
D3
Q3
Q16 Q18
Q22
V+
Q17 Q20
Q21
OUT
V–
1490A SS
LT1490A/LT1491A ‘ 7 ¢ , i U \U u; Emmi:- WL, * 7,7747%} WW} -\ 1 * 1 L; ‘ 1 0 x mmmm % mgr ‘ J‘L \ 7 \ L l * L» «9‘ " 1W7 <~ 4»="" warm="" fir="" ttddddfi="" a7="" ngggl="" in="" dem:="" l7="" ljuw="">
LT1490A/LT1491A
13
14901afd
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
3.00 t0.10
(4 SIDES)
NOTE:
1. DRAWING TO BE MADE A JEDEC PACKAGE OUTLINE M0-229 VARIATION OF (WEED-1)
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION
ON TOP AND BOTTOM OF PACKAGE
0.40 t 0.10
BOTTOM VIEW—EXPOSED PAD
1.65 t 0.10
(2 SIDES)
0.75 t0.05
R = 0.125
TYP
2.38 t0.10
14
85
PIN 1
TOP MARK
(NOTE 6)
0.200 REF
0.00 – 0.05
(DD8) DFN 0509 REV C
0.25 t 0.05
2.38 t0.05
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
APPLY SOLDER MASK TO AREAS THAT ARE NOT SOLDERED
1.65 t0.05
(2 SIDES)2.10 t0.05
0.50
BSC
0.70 t0.05
3.5 t0.05
PACKAGE
OUTLINE
0.25 t 0.05
0.50 BSC
DD Package
8-Lead Plastic DFN (3mm w 3mm)
(Reference LTC DWG # 05-08-1698 Rev C)
MSOP (MS8) 0307 REV F
0.53 t 0.152
(.021 t .006)
SEATING
PLANE
NOTE:
1. DIMENSIONS IN MILLIMETER/(INCH)
2. DRAWING NOT TO SCALE
3. DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS.
MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
4. DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS.
INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.152mm (.006") PER SIDE
5. LEAD COPLANARITY (BOTTOM OF LEADS AFTER FORMING) SHALL BE 0.102mm (.004") MAX
0.18
(.007)
0.254
(.010)
1.10
(.043)
MAX
0.22 – 0.38
(.009 – .015)
TYP
0.1016 t 0.0508
(.004 t .002)
0.86
(.034)
REF
0.65
(.0256)
BSC
0s – 6s TYP
DETAIL “A”
DETAIL “A”
GAUGE PLANE
12
34
4.90 t 0.152
(.193 t .006)
8765
3.00 t 0.102
(.118 t .004)
(NOTE 3)
3.00 t 0.102
(.118 t .004)
(NOTE 4)
0.52
(.0205)
REF
5.23
(.206)
MIN
3.20 – 3.45
(.126 – .136)
0.889 t 0.127
(.035 t .005)
RECOMMENDED SOLDER PAD LAYOUT
0.42 t 0.038
(.0165 t .0015)
TYP
0.65
(.0256)
BSC
MS8 Package
8-Lead Plastic MSOP
(Reference LTC DWG # 05-08-1660 Rev F)
LT1490A/LT1491A 7 flflflm ‘97» w w T \_/ i4 : *4 3 7’ V 7:; 547103“ f, ; 7’ U U U U WCHES [DD$$% éHHHT l Luann; 47 4k riHHHH :3 f * % LT«H% LA t L77 L7LJ1W
LT1490A/LT1491A
14
14901afd
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N8 REV I 0711
.065
(1.651)
TYP
.045 – .065
(1.143 – 1.651)
.130 t .005
(3.302 t 0.127)
.020
(0.508)
MIN
.018 t .003
(0.457 t 0.076)
.120
(3.048)
MIN
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255

12 34
87 65
.255 t .015*
(6.477 t 0.381)
.400*
(10.160)
MAX
NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
N Package
8-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508)s 45o
0o– 8o TYP
.008 – .010
(0.203 – 0.254)
SO8 0303
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
1234
.150 – .157
(3.810 – 3.988)
NOTE 3
8765
.189 – .197
(4.801 – 5.004)
NOTE 3
.228 – .244
(5.791 – 6.197)
.245
MIN .160 p.005
RECOMMENDED SOLDER PAD LAYOUT
.045 p.005
.050 BSC
.030 p.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
S8 Package
8-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
LT1490A/LT1491A VH—H—H—H—H—H—V [Elmlfii Vi’H H H H H; T Emmi J * HHHHHHH Lfgl; Emil L‘ Li J 74‘ L L—Li fl L7 LJUW
LT1490A/LT1491A
15
14901afd
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
N14 REV I 0711
.020
(0.508)
MIN
.120
(3.048)
MIN
.130 ± .005
(3.302 ± 0.127)
.045 – .065
(1.143 – 1.651)
.065
(1.651)
TYP
.018 ± .003
(0.457 ± 0.076)
.005
(0.127)
MIN
.255 ± .015*
(6.477 ± 0.381)
.770*
(19.558)
MAX
31 24567
8910
11
1213
14
.008 – .015
(0.203 – 0.381)
.300 – .325
(7.620 – 8.255)
.325 +.035
–.015
+0.889
–0.381
8.255

NOTE:
1. DIMENSIONS ARE INCHES
MILLIMETERS
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .010 INCH (0.254mm)
.100
(2.54)
BSC
1
N
234
.150 – .157
(3.810 – 3.988)
NOTE 3
14 13
.337 – .344
(8.560 – 8.738)
NOTE 3
.228 – .244
(5.791 – 6.197)
12 11 10 9
567
N/2
8
.016 – .050
(0.406 – 1.270)
.010 – .020
(0.254 – 0.508) w 45
0° – 8° TYP
.008 – .010
(0.203 – 0.254)
S14 0502
.053 – .069
(1.346 – 1.752)
.014 – .019
(0.355 – 0.483)
TYP
.004 – .010
(0.101 – 0.254)
.050
(1.270)
BSC
.245
MIN
N
123 N/2
.160 ±.005
RECOMMENDED SOLDER PAD LAYOUT
.045 ±.005
.050 BSC
.030 ±.005
TYP
INCHES
(MILLIMETERS)
NOTE:
1. DIMENSIONS IN
2. DRAWING NOT TO SCALE
3. THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED .006" (0.15mm)
N Package
14-Lead PDIP (Narrow .300 Inch)
(Reference LTC DWG # 05-08-1510 Rev I)
S Package
14-Lead Plastic Small Outline (Narrow .150 Inch)
(Reference LTC DWG # 05-08-1610)
LT1490A/LT1491A % fi’ ‘ W ¢ ‘ xuuwuuwu; WW4 ,,,,, , f, ,,,,,, i ,,,,, 7 x \ + i 0 x mm “WM 1 5* “a T \ L7LJCUEN2
LT1490A/LT1491A
16
14901afd
PACKAGE DESCRIPTION
Please refer to http://www.linear.com/designtools/packaging/ for the most recent package drawings.
3.00 p0.10
(2 SIDES)
5.00 p0.10
(2 SIDES)
NOTE:
1. DRAWING PROPOSED TO BE MADE VARIATION OF VERSION (WJED-1) IN JEDEC
PACKAGE OUTLINE MO-229
2. DRAWING NOT TO SCALE
3. ALL DIMENSIONS ARE IN MILLIMETERS
4. DIMENSIONS OF EXPOSED PAD ON BOTTOM OF PACKAGE DO NOT INCLUDE
MOLD FLASH. MOLD FLASH, IF PRESENT, SHALL NOT EXCEED 0.15mm ON ANY SIDE
5. EXPOSED PAD SHALL BE SOLDER PLATED
6. SHADED AREA IS ONLY A REFERENCE FOR PIN 1 LOCATION ON THE
TOP AND BOTTOM OF PACKAGE
0.40 p 0.10
BOTTOM VIEW—EXPOSED PAD
1.65 p 0.10
(2 SIDES)
0.75 p0.05
R = 0.115
TYP
R = 0.20
TYP
4.40 p0.10
(2 SIDES)
18
169
PIN 1
TOP MARK
(SEE NOTE 6)
0.200 REF
0.00 – 0.05
(DHC16) DFN 1103
0.25 p 0.05
PIN 1
NOTCH
0.50 BSC
4.40 p0.05
(2 SIDES)
RECOMMENDED SOLDER PAD PITCH AND DIMENSIONS
1.65 p0.05
(2 SIDES)
2.20 p0.05
0.50 BSC
0.65 p0.05
3.50 p0.05
PACKAGE
OUTLINE
0.25 p 0.05
DHC Package
16-Lead Plastic DFN (5mm × 3mm)
(Reference LTC DWG # 05-08-1706)
LT1490A/LT1491A L7 LJUW
LT1490A/LT1491A
17
14901afd
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no representa-
tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.
REVISION HISTORY
REV DATE DESCRIPTION PAGE NUMBER
C 10/10 Changed units from mV to V for VO in Electrical Characteristics
Updated package drawings
7
13-16
D 12/11 Revised Order Information 3
(Revision history begins at Rev C)
LT1490A/LT1491A é” a|N—. :: 14 E 5&4; ” ”1% \ L ” M g“ />%i T H; :35: T % a: ' m L quw :l I”— L7LJCUEN2
LT1490A/LT1491A
18
14901afd
Linear Technology Corporation
1630 McCarthy Blvd., Milpitas, CA 95035-7417
(408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com
© LINEAR TECHNOLOGY CORPORATION 2011
LT 1211 REV D • PRINTED IN USA
RELATED PARTS
TYPICAL APPLICATION
Ring-Tone Generator
–
+
–
+
–
+
–
+
1490A TA03
R6
10k
R2
47k
R7
16k
R8
620k
R4
1.6M
R1
33k
R3
10k
R5
100k
R10
620k
C4
0.068µF
9
10
6
7
8
1
5
C3
0.047µF
C5
0.01µF
R13
130k
R12
10k
R15
47k
R14
10k
R24
420
C7
47µF
LOAD
UP TO
TEN
PHONES
R23
4.7k
R26
2k
Q5
2N3904
Q4
2N3906
Q2
IRF9620
–180V
POWER AMPLIFIER
SMOOTHING FILTER
20Hz OSCILLATORCADENCE OSCILLATOR
*LED OF OPTO1 ILLUMINATES WHEN THE PHONE IS OFF THE HOOK
SEE DESIGN NOTE DN134 FOR A DISCUSSION OF THE CIRCUIT
R18
100
R17
620
R16
100k
Z1
15V
100k
R25
4.7k
C6
0.033µF
R21
150
R19
620
Z2
15V
R9
300k
R11
10k
D1
1N4148
C2
0.47µF
C1
1µF
2
31/4 LT1491A
1/4 LT1491A
12
4
11
13
Q1
IRF628 Q3
2N3904
60V
14
1/4 LT1491A
OPTO1*
R20
100k
1/4 LT1491A
PART NUMBER DESCRIPTION COMMENTS
LT1366/LT1367 Dual/Quad Precision, Rail-to-Rail Input and Output Op Amps 475µV VOS(MAX), 500V/mV AVOL(MIN), 400kHz GBW
LT1636 Single Over-The-Top Micropower Rail-to-Rail Input and Output
Op Amp
55µA Supply Current, VCM Extends 44V Above VEE,
Independent of VCC, MSOP Package, Shutdown Function
LT1638/LT1639 Dual/Quad 1.2MHz Over-The-Top Micropower, Rail-to-Rail
Input and Output Op Amps
0.4V/µs Slew Rate, 230µA Supply Current per Amplifier
LT1782 Micropower, Over-The-Top, SOT-23, Rail-to-Rail Input and
Output Op Amp
SOT-23, 800µV VOS(MAX), IS = 55µA (Max),
Gain-Bandwidth = 200kHz, Shutdown Pin
LT1783 1.2MHz, Over-The-Top, Micropower, Rail-to-Rail Input and
Output Op Amp
SOT-23, 800µV VOS(MAX), IS = 300µA (Max),
Gain-Bandwidth = 1.2MHz, Shutdown Pin