LT1490 Linear Technology Corporation, LT1490 Datasheet

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LT1490

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

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FEATURES
TYPICAL APPLICATIO
APPLICATIO S
, LTC and LT are registered trademarks of Linear Technology Corporation.
Rail-to-Rail Input and Output
Single Supply Input Range: – 0.4V to 44V
Micropower: 50 A/Amplifier Max
MSOP Package
Specified on 3V, 5V and 15V Supplies
High Output Current: 20mA
Output Drives 10,000pF with Output Compensation
Reverse Battery Protection to 18V
No Supply Sequencing Problems
High Voltage Gain: 1500V/mV
High CMRR: 98dB
No Phase Reversal
Gain Bandwidth Product: 200kHz
Battery- or Solar-Powered Systems
Supply Current Sensing
Battery Monitoring
Micropower Active Filters
4mA to 20mA Transmitters
Portable Instrumentation
Sensor Conditioning
U
CHARGER
VOLTAGE
I
BATT
U
LOAD
=
I
(R
0.2
BATT
R
S
S
)(R
G
V
/R
OUT
+
A
)(GAIN)
V
BATT
R
R
R A
2k
2k
R
2k
2k
A
B
B
'
'
= 12V
=
V
GAIN
OUT
Battery Monitor
AMPS
+
1/4 LT1491
+
1/4 LT1491
A
B
Input and Output Op Amps
2N3904
DESCRIPTIO
The dual LT
single and split supplies with a total voltage of 2V to 44V
drawing only 40 A 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 0.22 F and
150 compensation 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
The LT1490 dual op amp is available in the 8-pin MSOP,
SO and PDIP packages. The quad LT1491 is available in
the 14-pin SO and PDIP packages.
For new designs it is recommended that the LT1490A/
LT1491A be used instead of the LT1490/LT1491. See the
LT1490A/LT1491A data sheet for details.
2N3904
Q2
S1
S1 = OPEN, GAIN = 1
S1 = CLOSED, GAIN = 10
Q1
R
10k
Micropower Rail-to-Rail
G
10k
®
1490 and quad LT1491 op amps operate on all
or 44V above V
LOGIC HIGH (5V) = CHARGING
LOGIC LOW (0V) = DISCHARGING
1/4 LT1491
+
+
1/4 LT1491
R
V
C
D
A
S
90.9k
= 5V, 0V
= R
U
B
Dual and Quad
1490/91 TA01
LOGIC
V
OUT
, independent of V
LT1490/LT1491
+
.
1

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LT1490 Summary of contents

Page 1

... A 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 ...

Page 2

... Input Bias Current B Input Noise Voltage 2 U (Note 1) Junction Temperature ........................................... 150 C Specified Temperature Range (Note 3) .. – Storage Temperature Range ................. – 150 C Lead Temperature (Soldering, 10 sec).................. 300 (For new designs, use the LT1490A or LT1491A) ORDER PART NUMBER LT1490CMS8 OUT A 1 – LT1490CN8 + LT1490CS8 ...

Page 3

... V = 5V, Short to GND 5V, Short 2.5V to 12.5V – 100 A per Amplifier 1kHz – – – LT1490/LT1491 = half supply, unless otherwise noted. (Note 3) OUT MIN TYP MAX 200 1500 133 100 400 1500 250 200 22 50 250 450 22 50 250 500 330 500 2 ...

Page 4

... This depends on the power supply voltage and how many amplifiers are shorted. Note 3: The LT1490C/LT1491C are guaranteed to meet specified performance from The LT1490C/LT1491C are designed, characterized and expected to meet specified performance from – but are not tested or QA sampled at these temperatures. ...

Page 5

... A 0 – 0.01 0.001 0.01 0 SINKING LOAD CURRENT (mA) 1490/90 G05 Noise Voltage Density vs Frequency 100 1k FREQUENCY (Hz) 1490/91 G08 LT1490/LT1491 Input Bias Current vs Common Mode Voltage 6000 4000 2000 – 125 C A –10 4.0 4.4 4.8 5.2 5.6 44 COMMON MODE VOLTAGE (V) ...

Page 6

... LT1490/LT1491 W U TYPICAL PERFOR A CE CHARACTERISTICS Gain and Phase Shift vs Frequency 2. PHASE GAIN 10 0 –10 –20 – 100 1000 FREQUENCY (kHz) 1490/91 G10 Gain Bandwidth Product and Phase Margin vs Supply Voltage 250 240 PHASE MARGIN 230 220 210 200 GAIN BANDWIDTH ...

Page 7

... AT 1kHz 0.5V TO 2. 0.2V TO 2.2V IN 0.001 10 0 LOAD RESISTANCE TO GROUND (k ) Large-Signal Response V = 15V –1 V LT1490/LT1491 Capacitive Load Handling, Overshoot vs Capacitive Load 100 170 A SOURCE – 100 1000 CAPACITIVE LOAD (pF) 1490/91 F20 Total Harmonic Distortion + Noise vs Output Voltage 10 R ...

Page 8

... In mance curves. When monitoring voltages within 100mV of either rail, gain should be taken to keep the output from clipping. The output of the LT1490/LT1491 can be pulled up to 18V beyond V + that V is less than 0.5V. The normally reverse-biased substrate diode from the ...

Page 9

... U U APPLICATIO S I FOR ATIO Gain The open-loop gain is almost independent of load when the output is sourcing current. This optimizes perfor- U TYPICAL APPLICATIO S Square Wave Oscillator 59k 5V 100k + 1/2 LT1490 100k – R 50k C 1490/91 TA02 0 2RC WITH 5V SUPPLY OUT P 200 5V 50k 1nF ...

Page 10

... LT1490/LT1491 PACKAGE DESCRIPTIO 0.007 0 – 6 TYP (0.18) 0.021 0.006 (0.53 0.015) * DIMENSION DOES NOT INCLUDE MOLD FLASH, PROTRUSIONS OR GATE BURRS. MOLD FLASH, PROTRUSIONS OR GATE BURRS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE ** DIMENSION DOES NOT INCLUDE INTERLEAD FLASH OR PROTRUSIONS. INTERLEAD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.006" (0.152mm) PER SIDE 0.300 – ...

Page 11

... DWG # 05-08-1610) 0.337 – 0.344* (8.560 – 8.738 0.228 – 0.244 (5.791 – 6.197 0.053 – 0.069 (1.346 – 1.752) 0 – 8 TYP 0.014 – 0.019 (0.355 – 0.483) TYP LT1490/LT1491 0.770* (19.558) MAX 0.065 (1.651) TYP 0.018 0.003 (0.457 0.076) ...

Page 12

... Q2 R21 150 C6 0.033 F R20 –180V 100k 1490/1491 TA03 , 100nV/ C, 1MHz GBW, OS(MAX) TM Operation , 500V/ 400kHz GBW OS(MAX) VOL(MIN) , Improved Version of the LT1490/LT1491 OS(MAX) 14901fb LT/LCG 0600 2K REV B • PRINTED IN USA LINEAR TECHNOLOGY CORPORATION 1996 R26 2k OPTO1 TEN PHONES OS(MAX) OS(MAX) ...

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