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INA270, INA271

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SBOS381E – FEBRUARY 2007 – REVISED JANUARY 2018

Product Folder Links: INA270 INA271

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Copyright © 2007–2018, Texas Instruments Incorporated

(1)

RTI means Referred-to-Input.

(2)

Initial resistor variation is ±30% with an additional –2200-ppm/°C temperature coefficient.

(3)

For output behavior when VSENSE < 20 mV, see the Accuracy Variations as a Result of VSENSE and Common-Mode Voltage section.

(4)

Total output error includes effects of gain error and VOS.

(5)

See typical characteristic curve Output Swing vs Output Current and the Accuracy Variations as a Result of VSENSE and Common-Mode

Voltage section.

(6)

Ensured by design; not production tested.

7.5 Electrical Characteristics

At TA = +25°C, VS = +5 V, VCM = +12 V, VSENSE = 100 mV, and PRE OUT connected to BUF IN, unless otherwise noted.

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT

VSENSE

Full-scale input voltage

VSENSE = (VIN+) – (VIN–)

0.15 (VS – 0.2) / Gain

V

VCM

Common-mode input range

TA = –40°C to +125°C

–16

+80

V

CMRR

Common-mode rejection ratio

VIN+ = –16 V to +80 V

80

120

dB

CMRR over temperature

VIN+ = +12 V to +80 V, TA = –40°C to

+125°C

100

120

dB

VOS

Offset voltage, RTI(1)

±0.5

2.5

mV

VOS over temperature

TA = –40°C to +125°C

±3

mV

dVOS/dT

VOS vs temperature

TA = –40°C to +125°C

2.5

20

μV/°C

PSR

VOS vs power-supply

VS = +2.7 V to +18 V, VCM = +18 V,

TA = –40°C to +125°C

5

100

μV/V

IB

Input bias current, VIN– pin

TA = –40°C to +125°C

±8

±16

μA

PRE OUT output impedance(2)

96

k

Ω

Buffer input bias current

–50

nA

Buffer input bias current temperature

coefficient

±0.03

nA/°C

OUTPUT (VSENSE ≥ 20mV)

(3)

G

Gain

INA270 total gain

14

V/V

INA271 total gain

20

V/V

GBUF

Output buffer gain

2

V/V

Total gain error

VSENSE = 20 mV to 100 mV

±0.2%

±1%

Total gain error Over temperature

TA = –40°C to +125°C

±2%

Total gain error vs temperature

TA = –40°C to +125°C

50

ppm/°C

Total output error(4)

±0.75%

±2.2%

Total output error

TA = –40°C to +125°C

±1.0%

±3.0%

Nonlinearity error

VSENSE = 20 mV to 100 mV

±0.002%

RO

Output impedance, pin 5

1.5

Ω

Maximum capacitive load

No sustained oscillation

10

nF

VOLTAGE OUTPUT(5) (RL = 10 kΩ to GND)

Swing to V+ power-supply rail

TA = –40°C to +125°C

(V+) – 0.05

(V+) – 0.2

V

Swing to GND(6)

TA = –40°C to +125°C

VGND + 0.003

VGND + 0.05

V

FREQUENCY RESPONSE

BW

Bandwidth

CLOAD = 5 pF

130

kHz

Phase margin

CLOAD < 10 nF

40

Degrees

SR

Slew rate

1

V/μs

tS

Settling time (1%)

VSENSE = 10 mV to 100 mVPP,

CLOAD = 5 pF

2

μs