Document
INA117
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INA117
INA117
High Common-Mode Voltage DIFFERENCE AMPLIFIER
FEATURES
q COMMON-MODE INPUT RANGE: ±200V (VS = ±15V)
q PROTECTED INPUTS: ±500V Common-Mode ±500V Differential
q UNITY GAIN: 0.02% Gain Error max
q NONLINEARITY: 0.001% max
q CMRR: 86dB min
APPLICATIONS
q CURRENT MONITOR q BATTERY CELL-VOLTAGE MONITOR q GROUND BREAKER q INPUT PROTECTION q SIGNAL ACQUISITION IN NOISY
ENVIRONMENTS q 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.
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 quiescent current. The INA117’s 0.001% nonlinearity and 200kHz bandwidth are superior to those of conventional isolation amplifiers.
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.
21.11kΩ RefB 1
380kΩ –In 2
380kΩ +In 3
V– 4
380kΩ 20kΩ
8 Comp 7 V+ 6 VO 5 RefA
Copyright © 2000, Texas Instruments Incorporated
SBOS154A
Printed in U.S.A. December, 2000
SPECIFICATIONS
At TA = +25°C, VS = ±15V, unless otherwise noted.
PARAMETER
CONDITIONS
INA117AM, SM MIN TYP MAX
INA117BM MIN TYP MAX
INA117P, KU MIN TYP MAX
UNITS
GAIN Initial (1) Error
vs Temperature Nonlinearity (2)
1 0.01
2 0.0002
0.05 10 0.001
✻
✻
0.02
✻
✻
✻
✻
V/V
✻
✻
%
✻
ppm/°C
✻
✻
%
OUTPUT Rated Voltage Rated Current Impedance Current Limit Capacitive Load
IO = +20mA, –5mA
10
12
✻
VO = 10V
+20, –5
✻
0.01
To Common
+49, –13
Stable Operation
1000
INPUT
Impedance
Differential
800
Common-Mode
400
Voltage Range
Differential
±10
Common-Mode, Continuous ±200
✻
Common-Mode Rejection (3)
DC
70
80
86
AC, 60Hz
VCM = 400Vp-p
66
80
66
vs Temperature, DC
TA = TMIN to TMAX
AM, BM, P, KU
66
75
80
SM
60
75
OFFSET VOLTAGE Initial
KU Grade (SO-8 Package) vs Temperature vs Supply vs Time
RTO (4)
TA = TMIN to TMAX VS = ±5V to ±18V
120 1000
8.5
40
74
90
80
200
OUTPUT NOISE VOLTAGE
RTO (5)
fB = 0.01Hz to 10Hz
25
fB = 10kHz
550
DYNAMIC RESPONSE
Gain Bandwidth, –3dB
200
Full Power Bandwidth Slew Rate
VO = 20Vp-p
30
✻
2
2.6
✻
Settling Time: 0.1%
VO = 10V Step
6.5
0.01%
VO = 10V Step
10
0.01%
VCM = 10V Step, VDIFF = 0V
4.5
POWER SUPPLY Rated Voltage Range Quiescent Current
Derated Performance VO = 0V
±15
±5
±18
✻
1.5
2
TEMPERATURE RANGE Specification: AM, BM, P, KU
SM Operation Storage
–25
+85
✻
–55
+125
–55
+125
✻
–65
+150
✻
✻
✻
✻
V
✻
mA
✻
✻
Ω
✻
✻
mA
✻
✻
pF
✻
✻
kΩ
✻
✻
kΩ
✻
✻
V
✻
V
94
✻
✻
dB
94
✻
✻
dB
90
✻
dB
dB
✻
1000
✻
40
✻
✻
✻
✻
✻
✻
µV
600 2000
µV
✻
µV/°C
✻
dB
✻
µV/mo
✻
✻
µVp-p
✻
✻
nV/√Hz
✻
✻
kHz
✻
kHz
✻
✻
✻
V/µs
✻
✻
µs
✻
✻
µs
✻
✻
µs
✻
✻
V
✻
✻
✻
V
✻
✻
✻
✻
mA
✻
–40
✻
–40
✻
–55
+85
°C
°C
+85
°C
+125
°C
✻Specification same as for INA117AM. NOTES: (1) Connected as difference amplifier (see Figure 1). (2) Nonlinearity is the maximum peak deviation from the best-fit straight line as a percent of full-scale peak-to-peak output. (3) With zero source impedance (see discussion of common-mode rejection in Application Information section). (4) Includes effects of amplifier’s input bias and offset currents. (5) Includes effects of amplifier’s input current noise and thermal noise contribution of resistor network.
2
INA117
SBOS154A
PIN CONFIGURATION
Top View Ref B 1
TO-99
Tab
INA117AM, BM, SM
Comp 8
V+ 7
–In 2
6 Output
3 +In
5 Ref A
4
V–
Case internally connected to V–. Make no connection.
Top View
RefB 1 –In 2 +In 3 V– 4
DIP/SO INA117P, KU
8 Comp 7 V+ 6 Output 5 RefA
ABSOLUTE MAXIMUM RATINGS
Supply Voltage .................................................................................. ±22V Input Voltage Range, Continuous ................................................... ±200V
Common-Mode and Differential, 10s ........................................... ±500V Operating Temperature
M Metal TO-99 ................................................................ –55 to +125°C P Plastic DIP and U SO-8 ................................