LT1881 Linear Technology, LT1881 Datasheet

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LT1881

Manufacturer Part Number
LT1881
Description
Dual and Quad Rail-to-Rail Output/ Picoamp Input Precision Op Amps
Manufacturer
Linear Technology
Datasheet

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FEATURES
APPLICATIO S
TYPICAL APPLICATIO
LT1634
4.096V
1.65k
Offset Voltage: 50 V Maximum (LT1881A)
Input Bias Current: 200pA Maximum (LT1881A)
Offset Voltage Drift: 0.8 V/ C Maximum
Rail-to-Rail Output Swing
Supply Range: 2.7V to 36V
Operates with Single or Split Supplies
Open-Loop Voltage Gain: 1 Million Minimum
1mA Maximum Supply Current Per Amplifier
Stable at A
Standard Pinouts
Thermocouple Amplifiers
Bridge Transducer Conditioners
Instrumentation Amplifiers
Battery-Powered Systems
Photo Current Amplifiers
R1
V
16-Bit Voltage Output DAC on 5V Supply
= 1, C
+
LT1881
R
–5V
5V
COM
U
LTC
L
®
1597
= 1000pF
REF
5V
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 represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
R
DAC
OFS
U
33pF
Picoamp Input Precision Op Amps
+
LT1881
–5V
5V
V
– 4.096V
TO 4.096V
OUT
1881/2 TA01
DESCRIPTIO
The LT
input performance to amplifiers with rail-to-rail output
swing. Input bias currents and capacitive load driving
capabilities are superior to the similar LT1884 and LT1885
amplifiers, at the cost of a slight loss in speed. Input
offset voltage is trimmed to less than 50 V and the low
drift maintains this accuracy over the operating tempera-
ture range. Input bias currents are an ultralow 200pA
maximum.
The amplifiers work on any total power supply voltage
between 2.7V and 36V (fully specified from 5V to 15V).
Output voltage swings to within 40mV of the negative
supply and 220mV of the positive supply make these
amplifiers good choices for low voltage single supply
operation.
Capacitive loads up to 1000pF can be driven directly in
unity-gain follower applications.
The dual LT1881 and LT1881A are available with standard
pinouts in S8 and PDIP packages. The quad LT1882 is in
a 14-pin SO package. For a higher speed device with
similar DC specifications, see the LT1884/LT1885.
, LTC and LT are registered trademarks of Linear Technology Corporation.
®
26
24
22
20
18
16
14
12
10
8
6
4
2
0
1881 and LT1882 op amps bring high accuracy
1
V
40 N8 (1 LOT)
144 S8 (2 LOTS)
184 TOTAL PARTS
S
–0.9
= 15V
–0.8
–0.7
Rail-to-Rail Output,
TC V
–0.6
U
–0.5
OS
–0.4
INPUT OFFSET VOLTAGE DRIFT ( V/ C)
Dual and Quad
Distribution, Industrial Grade
Final Electrical Specifications
–0.3
–0.2
LT1881/LT1882
–0.1
0
0.1
0.2
0.3
0.4
April 2000
0.5
0.6
0.7
0.8
1881/2 TA01a
0.9 1
1

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LT1881 Summary of contents

Page 1

... Capacitive loads up to 1000pF can be driven directly in unity-gain follower applications. The dual LT1881 and LT1881A are available with standard pinouts in S8 and PDIP packages. The quad LT1882 14-pin SO package. For a higher speed device with similar DC specifications, see the LT1884/LT1885. ...

Page 2

... V Input Offset Voltage (LT1881A) OS Input Offset Voltage (LT1881/LT1882) Input Offset Voltage Drift (Note 6) I Input Offset Current (LT1881A) OS Input Offset Current (LT1881/LT1882 (Note 1) Operating Temperature Range (Note 4) .. – Specified Temperature Range (Note 5) ... – – Maximum Junction Temperature .......................... 150 C Storage Temperature Range ................. – ...

Page 3

... T Single supply operation 5V SYMBOL PARAMETER I Input Bias Current (LT1881A) B Input Bias Current (LT1881/LT1882) Input Noise Voltage e Input Noise Voltage Density n i Input Noise Current Density ...

Page 4

... S CM SYMBOL PARAMETER V Input Offset Voltage (LT1881A) OS Input Offset Voltage (LT1881/LT1882) Input Offset Voltage Drift (Note 6) I Input Offset Current (LT1881A) OS Input Offset Current (LT1881/LT1882) I Input Bias Current (LT1881A) B Input Bias Current (LT1881/LT1882) Input Noise Voltage e Input Noise Voltage Density n i ...

Page 5

... SC GBW Gain-Bandwidth Product t Settling Time Slew Rate Positive – SR Slew Rate Negative V Offset Voltage Match (LT1881/LT1882) OS Offset Voltage Match (LT1881A) Offset Voltage Match Drift I + Noninverting Bias Current Match B (LT1881/LT1882) Noninverting Bias Current Match (LT1881A) CMRR Common Mode Rejection Match CONDITIONS – ...

Page 6

... EE Note 6: This parameter is not 100% tested. Note 7: Matching parameters are the difference between amplifiers A and B in the LT1881; and between amplifiers A and D and B and C in the LT1882. Note 8: This parameter is the difference between the two noninverting input bias currents. ...

Page 7

... V = 15V S S –30 –40 1k 10k 100k 1M 10M FREQUENCY (Hz) , LOAD 1500pF 1000pF 500pF 0pF 10M 100M 1881/2 G10 LT1881/LT1882 Gain Bandwidth Product vs Supply Voltage 900 850 125 C 800 25 C 750 –55 C 700 650 600 TOTAL SUPPLY VOLTAGE (V) 1881/2 G05 ...

Page 8

... LT1881/LT1882 W U TYPICAL PERFOR A CE CHARACTERISTICS Large Signal Response –1 V TIME (50 s/DIV) 1881/2 G12 Small Signal Response – 1000pF L TIME (2 s/DIV) 1881/2 G15 8 Large Signal Response TIME (50 s/DIV) 1881/2 G13 Small Signal Response TIME (2 s/DIV) 1881/2 G16 Small Signal Response – ...

Page 9

... BIAS BIAS specification being The LT1881 and LT1882 can drive capacitive loads up to 1000pF in unity-gain. The capacitive load driving in- creases as the amplifier is used in higher gain configura- tions. Capacitive load driving may be increased by decoupling the capacitance from the output with a small resistance ...

Page 10

... LT1881/LT1882 PACKAGE DESCRIPTIO 0.300 – 0.325 (7.620 – 8.255) 0.009 – 0.015 (0.229 – 0.381) +0.035 0.325 –0.015 +0.889 8.255 –0.381 *THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS. MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm Dimensions in inches (millimeters) unless otherwise noted. ...

Page 11

... TYP 0.014 – 0.019 (0.355 – 0.483) TYP LT1881/LT1882 0.150 – 0.157** (3.810 – 3.988 0.004 – 0.010 (0.101 – 0.254) 0.050 (1.270) BSC SO8 1298 0.337 – ...

Page 12

... 1.588mV RT: OMEGA F4132 1000 RTD R1, R2, R3, RF: USE BI 698 RESISTOR NETWORK COMMENTS Max OS Gain Error = 0.08% Max I = 10pA Max B 3 Times Faster than LT1881/LT1882 Max, Rail-to-Rail Output REF +IN CLK LTC1287 –IN D OUT GND ...

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