TEXAS INSTRUMENTS INA117 Technical data

www.ti.com

IN

A

11

7

INA117

High Common-Mode Voltage

DIFFERENCE AMPLIFIER

INA117

FEATURES

● COMMON-MODE INPUT RANGE:

±200V (V

= ±15V)

S

● PROTECTED INPUTS:

±500V Common-Mode
±500V Differential

● UNITY GAIN: 0.02% Gain Error max

● NONLINEARITY: 0.001% max

● CMRR: 86dB min

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.

APPLICATIONS

● CURRENT MONITOR

● BATTERY CELL-VOLTAGE MONITOR

● GROUND BREAKER

● INPUT PROTECTION

● SIGNAL ACQUISITION IN NOISY

ENVIRONMENTS

● FACTORY AUTOMATION

Ref

–In

+In

V–

21.11kΩ

1

B

380kΩ

2

380kΩ

3

4

380kΩ

20kΩ

Comp

8

V+

7

V

6

O

Ref

5

A

Copyright © 2000, Texas Instruments Incorporated SBOS154A Printed in U.S.A. December, 2000

SPECIFICATIONS

At TA = +25°C, VS = ±15V, unless otherwise noted.

INA117AM, SM INA117BM INA117P, KU
PARAMETER CONDITIONS MIN TYP MAX MIN TYP MAX MIN TYP MAX UNITS
GAIN

(1)

Initial
Error 0.01 0.05 ✻ 0.02 ✻✻ %

vs Temperature 2 10 ✻✻ppm/°C

Nonlinearity

(2)

OUTPUT

Rated Voltage I
Rated Current V
Impedance 0.01 ✻✻Ω

= +20mA, –5mA 10 12 ✻✻ ✻✻ V

O

= 10V +20, –5 ✻✻mA

O

Current Limit To Common +49, –13 ✻✻mA
Capacitive Load Stable Operation 1000 ✻✻pF

INPUT

Impedance Differential 800 ✻✻kΩ

Common-Mode 400 ✻✻kΩ

Voltage Range Differential ±10 ✻✻V

Common-Mode, Continuous

Common-Mode Rejection

(3)

±200 ✻✻ V

DC 70 80 86 94 ✻✻ dB
AC, 60Hz V

vs Temperature, DC T

AM, BM, P, KU 66 75 80 90 ✻ dB

= 400Vp-p 66 80 66 94 ✻✻ dB

CM

= T

to T

A

MIN

MAX

SM 60 75 dB

OFFSET VOLTAGE RTO

(4)

Initial 120 1000 ✻ 1000 ✻✻µV

KU Grade (SO-8 Package) 600 2000 µV
vs Temperature T
vs Supply V
vs Time 200 ✻✻µV/mo

OUTPUT NOISE VOLTAGE RTO

= T

to T

A

MIN

= ±5V to ±18V 74 90 80 ✻✻✻✻ dB

S

MAX

(5)

fB = 0.01Hz to 10Hz 25 ✻✻µVp-p
f

= 10kHz 550 ✻✻nV/√Hz

B

DYNAMIC RESPONSE

Gain Bandwidth, –3dB 200 ✻✻kHz
Full Power Bandwidth V
Slew Rate 2 2.6 ✻✻ ✻✻ V/µs
Settling Time: 0.1% V

0.01% V

0.01% V

= 20Vp-p 30 ✻✻kHz

O

= 10V Step 6.5 ✻✻µs

O

= 10V Step 10 ✻✻µs

O

= 10V Step, V

CM

= 0V 4.5 ✻✻µs

DIFF

POWER SUPPLY

Rated ±15 ✻✻V
Voltage Range Derated Performance ±5 ±18 ✻✻✻✻V
Quiescent Current V

= 0V 1.5 2 ✻✻ ✻✻mA

O

TEMPERATURE RANGE

Specification: AM, BM, P, KU –25 +85 ✻✻–40 +85 °C

SM –55 +125 °C
Operation –55 +125 ✻✻–40 +85 °C
Storage –65 +150 ✻✻–55 +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.

1 ✻✻V/V

0.0002 0.001 ✻✻ ✻✻ %

8.5 40 ✻ 40 ✻ µV/°C

2

INA117

SBOS154A

PIN CONFIGURATION

Top View TO-99

Tab

Comp

8

Ref B

1

INA117AM, BM, SM

V+

7

Top View DIP/SO

1

Ref

B

8

INA117P, KU

Comp

–In

3

+In

4

V–

Case internally connected to V–. Make no connection.

62

Output

5

Ref A

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 ................................................ –40 to +85°C

Storage Temperature

M Package .......................................................................–65 to +150°C

P Plastic DIP and U SO-8 .............................................. –55 to +125°C

Lead Temperature (soldering, 10s) ............................................... +300°C

Output Short Circuit to Common ............................................. Continuous

–In

+In

V–

2

3

4

7

V+

6

Output

5

Ref

A

ELECTROSTATIC
DISCHARGE SENSITIVITY

This integrated circuit can be damaged by ESD. Texas Instru­ments recommends that all integrated circuits be handled with
appropriate precautions. Failure to observe proper handling
and installation procedures can cause damage.

ESD damage can range from subtle performance degrada­tion to complete device failure. Precision integrated circuits
may be more susceptible to damage because very small
parametric changes could cause the device not to meet its
published specifications.

PACKAGE/ORDERING INFORMATION

PACKAGE SPECIFIED

PRODUCT PACKAGE NUMBER RANGE MARKING NUMBER

DRAWING TEMPERATURE PACKAGE ORDERING TRANSPORT

INA117P DIP-8 006 –40°C to +85°C INA117P INA117P Rails
INA117KU SO-8 Surface-Mount 182 " INA117KU INA117KU Rails

" " " " " INA117KU/2K5 Tape and Reel
INA117AM TO-99 Metal 001 –25°C to +85°C INA117AM INA117AM Rails
INA117BM " " " INA117BM INA117BM Rails
INA117SM " " –55°C to +125°C INA117SM INA117SM Rails

NOTE: (1) Models with a slash (/ ) are available only in Tape and Reel in the quantities indicated (e.g., /2K5 indicates 2500 devices per reel). Ordering 2500
pieces of “INA117KU/2K5” will get a single 2500-piece Tape and Reel.

(1)

MEDIA

INA117

SBOS154A

3

TYPICAL PERFORMANCE CURVES

At TA = +25°C, VS = ±15V, unless otherwise noted.

100

Common-Mode Rejection (dB)

400

350

300

250

200

COMMON-MODE REJECTION vs FREQUENCY

INA117BM

90

80

INA117AM, SM, P, KU

70

60

50

40

20 100 1k 10k 100k 2M

Frequency (Hz)

POSITIVE COMMON-MODE VOLTAGE RANGE

vs POSITIVE POWER-SUPPLY VOLTAGE

TA = –55°C

TA = +25°C

Max Rating = 200V

TA = +125°C

100

Power-Supply Rejection (dB)

–400

–350

–300

–250

–200

POWER-SUPPLY REJECTION vs FREQUENCY

90

80

70

60

50

40

1 10 100 1k 10k

V+

NEGATIVE COMMON-MODE VOLTAGE RANGE

vs NEGATIVE POWER-SUPPLY VOLTAGE

Max Rating = –200V

V–

Frequency (Hz)

TA = +25°C

TA = –55°C to +125°C

150

100

Positive Common-Mode Range (V)

50

5101520

Positive Power-Supply Voltage (V)

–VS = –5V to –20V

–150

–100

Negative Common-Mode Range (V)

–50

–5 –10 –15 –20

Negative Power-Supply Voltage (V)

+VS = +5V to +20V

4

INA117

SBOS154A

TYPICAL PERFORMANCE CURVES (Cont.)

At TA = +25°C, VS = ±15V, unless otherwise noted.

SMALL SIGNAL STEP RESPONSE

C

= 0

L

SMALL SIGNAL STEP RESPONSE

CL = 1000pF

LARGE SIGNAL STEP RESPONSE

INA117

SBOS154A

5

APPLICATION INFORMATION

Figure 1 shows the basic connections required for operation.
Applications with noisy or high-impedance power-supply lines

may require decoupling capacitors close to the device pins.
The output voltage is equal to the differential input volt-

age between pins 2 and 3. The common mode input
voltage is rejected.

Internal circuitry connected to the compensation pin 8 can­cels the parasitic distributed capacitance between the feed­back resistor, R2, and the IC substrate. For specified dy­namic performance, pin 8 should be grounded or connected
through a 0.1µF capacitor to an AC ground such as V+.

–15V +15V

1µF

Tantalum

–In = V

+In = V

+

47

R

1

380kΩ 380kΩ

2

2

R

3

380kΩ

3

3

R

5

21.1kΩ

815

R

20kΩ

R

2

4

+

Tantalum

6

VO = V3 – V

1µF

2

FIGURE 1. Basic Power and Signal Connections.

V– V+

380kΩ 380kΩ

2

V

2

380kΩ

3

V

3

21.1kΩ 20kΩ

(a)

V– V+

47

380kΩ 380kΩ

2

V

2

380kΩ

3

V

3

21.1kΩ 20kΩ

815

47

6

815

100kΩ

10Ω

6

V = V – V

O 3 2

V+

VO = V3 – V

+15V

–15V

1/2 REF200

2

50kΩ
±1.5mV
Range

100µA

COMMON-MODE REJECTION

Common-mode rejection (CMR) of the INA117 is depend­ent on the input resistor network, which is laser-trimmed for
accurate ratio matching. To maintain high CMR, it is impor­tant to have low source impedances driving the two inputs.
A 75Ω resistance in series with pin 2 or 3 will decrease CMR
from 86dB to 72dB.

Resistance in series with the reference pins will also degrade
CMR. A 4Ω resistance in series with pin 1 or 5 will decrease
CMRR from 86dB to 72dB.

Most applications do not require trimming. Figures 2 and 3
show optional circuits that may be used for trimming offset
voltage and common-mode rejection.

TRANSFER FUNCTION

Most applications use the INA117 as a simple unity-gain
difference amplifier. The transfer function is:

VO = V3 – V

2

V3 and V2 are the voltages at pins 3 and 2.

100Ω

100Ω

100µA

1/2 REF200

V–

(b)

Offset adjustment is regulated—

insensitive to power supply variations.

OPA27

±10mV

10kΩ

FIGURE 2. Offset Voltage Trim Circuits.

Some applications, however, apply voltages to the reference
terminals (pins 1 and 5). A more complete transfer function
is:

VO = V3 – V2 + 19 • V5 – 18 • V

1

V5 and V1 are the voltages at pins 5 and 1.

6

INA117

SBOS154A