INA117
IN
A
11
7
INA117
www.ti.com
High Common-Mode Voltage
DIFFERENCE AMPLIFIER
FEATURES
APPLICATIONS
ꢀ COMMON-MODE INPUT RANGE:
ꢀ CURRENT MONITOR
±200V (VS = ±15V)
ꢀ BATTERY CELL-VOLTAGE MONITOR
ꢀ GROUND BREAKER
ꢀ PROTECTED INPUTS:
±500V Common-Mode
±500V Differential
ꢀ INPUT PROTECTION
ꢀ SIGNAL ACQUISITION IN NOISY
ꢀ UNITY GAIN: 0.02% Gain Error max
ꢀ NONLINEARITY: 0.001% max
ꢀ CMRR: 86dB min
ENVIRONMENTS
ꢀ FACTORY AUTOMATION
DESCRIPTION
The INA117 is a precision unity-gain difference
amplifier with very high common-mode input voltage
range. It is a single monolithic IC consisting of a
precision op amp and integrated thin-film resistor
network. It can accurately measure small differential
voltages in the presence of common-mode signals up
to ±200V. The INA117 inputs are protected from
momentary common-mode or differential overloads
up to ±500V.
21.11kΩ
RefB
–In
+In
V–
Comp
V+
1
2
3
4
8
7
6
5
380kΩ
380kΩ
380kΩ
20kΩ
In many applications, where galvanic isolation is not
essential, the INA117 can replace isolation amplifiers.
This can eliminate costly isolated input-side power
supplies and their associated ripple, noise and quies-
cent current. The INA117’s 0.001% nonlinearity and
200kHz bandwidth are superior to those of conven-
tional isolation amplifiers.
VO
RefA
The INA117 is available in 8-pin plastic mini-DIP and
SO-8 surface-mount packages, specified for the –40°C
to +85°C temperature range. The metal TO-99 models
are available specified for the –40°C to +85°C and
–55°C to +125°C temperature range.
Copyright © 2000, Texas Instruments Incorporated
SBOS154A
Printed in U.S.A. December, 2000