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LT1490 Datasheet

Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps

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LT1490/LT1491
Dual and Quad
Micropower Rail-to-Rail
Input and Output Op Amps
FEATURES
s Rail-to-Rail Input and Output
s Single Supply Input Range: – 0.4V to 44V
s Micropower: 50µA/Amplifier Max
s Specified on 3V, 5V and ±15V Supplies
s High Output Current: 20mA
s Output Drives 10,000pF with Output Compensation
s Reverse Battery Protection to 18V
s No Supply Sequencing Problems
s High Voltage Gain: 1500V/mV
s High CMRR: 98dB
s No Phase Reversal
s Gain Bandwidth Product: 200kHz
U
APPLICATIONS
s Battery- or Solar-Powered Systems
Portable Instrumentation
Sensor Conditioning
s Supply Current Sensing
s Battery Monitoring
s Micropower Active Filters
s 4mA to 20mA Transmitters
DESCRIPTION
The dual LT®1490 and quad LT1491 op amps operate on all
single and split supplies with a total voltage of 2V to 44V
drawing only 40µA of quiescent current per amplifier. These
amplifiers are reverse supply protected; they draw no current
for reverse supply up to 18V. The input range of the LT1490/
LT1491 includes both supplies and the output swings to both
supplies. Unlike most micropower op amps, the LT1490/
LT1491 can drive heavy loads; their rail-to-rail outputs drive
20mA. The LT1490/LT1491 are unity-gain stable and drive all
capacitive loads up to 10,000pF when optional 0.22µF and
150compensation is used.
The LT1490/LT1491 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 resis-
tors protect the inputs for faults below the negative supply
up to 22V. There is no phase reversal of the output for inputs
22V below V or 44V above V, independent of V +.
The LT1490 dual op amp is available in the 8-pin SO and
PDIP packages. The quad LT1491 is available in the 14-pin
SO and PDIP packages.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATION
CHARGER
VOLTAGE
RS
0.2
IBATT
RA
2k
RA'
2k
Battery Monitor
+
A
1/4 LT1491
Q1
2N3904
LOAD
RB
2k
RB'
2k
+
VBATT = 12V
+
B
1/4 LT1491
Q2
2N3904
S1
RG
10k
10k
C
1/4 LT1491
+
LOGIC
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
+
D
1/4 LT1491
90.9k
VOUT
IBATT
=
VOUT
=
(RS)(RG/RA)(GAIN)
VOUT AMPS
GAIN
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
RA = RB
VS = 5V, 0V
1490/91 TA01
1


Linear Technology Electronic Components Datasheet

LT1490 Datasheet

Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps

No Preview Available !

LT1490/LT1491
ABSOLUTE MAXIMUM RATINGS
Total Supply Voltage (V + to V ) .............................. 44V
Input Differential Voltage ......................................... 44V
Input Current ...................................................... ±25mA
Output Short-Circuit Duration (Note 1) ......... Continuous
Operating Temperature Range ................ – 40°C to 85°C
Junction Temperature ........................................... 150°C
Specified Temperature Range (Note 2) .. – 40°C to 85°C
Storage Temperature Range ................. – 65°C to 150°C
Lead Temperature (Soldering, 10 sec).................. 300°C
PACKAGE/ORDER INFORMATION
OUT A 1
–IN A 2
+IN A 3
V4
TOP VIEW
A
B
8 V+
7 OUT B
6 –IN B
5 +IN B
MS8 PACKAGE
8-LEAD MSOP
N8 PACKAGE
8-LEAD PDIP
S8 PACKAGE
8-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 250°C/ W (MS8)
TJMAX = 150°C, θJA = 130°C/ W (N8)
TJMAX = 150°C, θJA = 190°C/ W (S8)
ORDER PART
NUMBER
LT1490CMS8
LT1490CN8
LT1490CS8
MS8 PART MARKING
LTBB
S8 PART MARKING
1490
Consult factory for Industrial and Military grade parts.
TOP VIEW
OUT A 1
–IN A 2
+IN A 3
V+ 4
+IN B 5
–IN B 6
OUT B 7
A
B
14 OUT D
13 –IN D
D
12 +IN D
11 V
10 +IN C
C
9 – IN C
8 OUT C
N PACKAGE
S PACKAGE
14-LEAD PDIP 14-LEAD PLASTIC SO
TJMAX = 150°C, θJA = 110°C/ W (N)
TJMAX = 150°C, θJA = 150°C/ W (S)
ORDER PART
NUMBER
LT1491CN
LT1491CS
ELECTRICAL CHARACTERISTICS
VS = 3V, 0V; VS = 5V, 0V; VCM = VOUT = half supply, TA = 25°C, unless otherwise noted. (Note 2)
SYMBOL PARAMETER
CONDITIONS
MIN TYP MAX
VOS Input Offset Voltage
Input Offset Voltage Drift
IOS Input Offset Current
IB Input Bias Current
Input Noise Voltage
LT1490 N Package
0°C TA 70°C
– 40°C TA 85°C
LT1490 S Package
0°C TA 70°C
– 40°C TA 85°C
LT1491 N Package
0°C TA 70°C
– 40°C TA 85°C
LT1490CMS8 Package, LT1491 S Package
0°C TA 70°C
– 40°C TA 85°C
0°C TA 70°C (Note 6)
VCM = 44V (Note 3)
VCM = 44V (Note 3)
VS = 0V
0.1Hz to 10Hz
q
q
q
q
q
q
q
q
q
q
q
q
q
220 800
1000
1100
220 950
1200
1300
300 1100
1350
1450
350 1450
1650
1750
24
0.2 0.8
0.8
48
4 10
0.1
1
en Input Noise Voltage Density f = 1kHz
in Input Noise Current Density f = 1kHz
50
0.03
UNITS
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV
µV/°C
nA
µA
nA
µA
nA
µVP-P
nV/Hz
pA/Hz
2


Part Number LT1490
Description Dual and Quad Micropower Rail-to-Rail Input and Output Op Amps
Maker Linear Technology
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LT1490 Datasheet PDF






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