FEATURES

Shut Down: < 1

µA

2ppm/

°C

−55

°C to +125°C

DUAL VERSION IN TSSOP-14 PACKAGE

DESCRIPTION

The INA321 family is a series of rail-to-rail output,

micropower CMOS instrumentation amplifiers that offer

wide-range, single-supply, as well as bipolar-supply

operation. The INA321 family provides low-cost, low-noise

amplification of differential signals with micropower

current consumption of 40

µA. When shutdown, the

INA321 has a quiescent current of less than 1

µA.

Returning to normal operations within nanoseconds, the

shutdown

feature

makes

the

INA321

optimal

for

low-power battery or multiplexing applications.

Configured internally for 5V/V gain, the INA321 offers

exceptional flexibility with user-programmable external

gain resistors. The INA321 reduces common-mode error

over frequency and with CMRR remaining high up to 3kHz,

line noise and line harmonics are rejected.

The low-power design does not compromise on bandwidth

or slew rate, making the INA321 ideal for driving sample

Analog-to-Digital

(A/D)

converters

as

well

as

general-purpose applications. With high precision, low

cost, and small packaging, the INA321 outperforms

discrete

designs,

while

offering

reliability

and

performance.

APPLICATIONS

Bridge, RTD, Thermistor, Position

ECG, EEG, EMG

CMRR vs FREQUENCY

Frequency (Hz)

1k

10

100

10k

120

100

80

60

40

INA321

Nearest

Competition

10x

Im provement

A2

A1

A3

160k

Ω

REF

40k

Ω

40k

Ω

Shutdown

V+

Gain =5 +5(R2/R1)

V

−

RG

160k

Ω

INA321

INA2321

SBOS168B − DECEMBER 2000 − REVISED JULY 2004

microPower, Single-Supply, CMOS

Instrumentation Amplifier

www.ti.com

Copyright

 2000-2004, Texas Instruments Incorporated

Please be aware that an important notice concerning availability, standard warranty, and use in critical applications of Texas Instruments

semiconductor products and disclaimers thereto appears at the end of this data sheet.

All trademarks are the property of their respective owners.

PRODUCTION DATA information is current as of publication date. Products

conform to specifications per the terms of Texas Instruments standard warranty.

Production processing does not necessarily include testing of all parameters.