INA116 Datasheet, PDF (1/9 Pages) Burr-Brown (TI) – Ultra Low Input Bias Current INSTRUMENTATION AMPLIFIER

®
INA116
INA116
INA116
Ultra Low Input Bias Current
INSTRUMENTATION AMPLIFIER
FEATURES
q LOW INPUT BIAS CURRENT: 3fA typ
q BUFFERED GUARD DRIVE PINS
q LOW OFFSET VOLTAGE: 2mV max
q HIGH COMMON-MODE REJECTION:
84dB (G = 10)
q LOW QUIESCENT CURRENT: 1mA
q INPUT OVER-VOLTAGE PROTECTION: ±40V
APPLICATIONS
q LABORATORY INSTRUMENTATION
q pH MEASUREMENT
q ION–SPECIFIC PROBES
q LEAKAGE CURRENT MEASUREMENT
DESCRIPTION
The INA116 is a complete monolithic FET-input instru-
mentation amplifier with extremely low input bias
current. Difet ^® inputs and special guarding techniques
yield input bias currents of 3fA at 25°C, and only 25fA
at 85°C. Its 3-op amp topology allows gains to be set
from 1 to 1000 by connecting a single external resistor.
Guard pins adjacent to both input connections can be
used to drive circuit board and input cable guards to
maintain extremely low input bias current.
The INA116 is available in 16-pin plastic DIP and SOL-16
surface-mount packages, specified for the –40°C to +85°C
temperature range.
Guard
–
V_IN
Guard
2
3 Over-Voltage
Protection ⁺¹
4
1
R_G
16
Guard
+
V_IN
Guard
5
6 Over-Voltage
Protection ⁺¹
7
Difet^®; Burr-Brown Corporation
V+
13
A₁
25kΩ
60kΩ
25kΩ
A₂
60kΩ
8
V–
INA116
60kΩ
G = 1 + ^50kΩ
R_G
A₃
11 ^VO
60kΩ
Ref
9
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©1994 Burr-Brown Corporation
PDS-1242B
Printed in U.S.A. May, 1995