INA321 Datasheet, PDF (1/21 Pages) Texas Instruments – microPower, Single-Supply, CMOS Instrumentation Amplifier

INA321
INA2321
SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006
microPower, Single-Supply, CMOS
Instrumentation Amplifier
FEATURES
D LOW QUIESCENT CURRENT: 40µA/channel
Shut Down: < 1µA
D HIGH GAIN ACCURACY: G = 5, 0.02%,
2ppm/°C
D GAIN SET WITH EXTERNAL RESISTORS
D LOW OFFSET VOLTAGE: ±200µV
D HIGH CMRR: 94dB
D LOW BIAS CURRENT: 10pA
D BANDWIDTH: 500kHz, G = 5V/V
D RAIL-TO-RAIL OUTPUT SWING: (V+) − 0.02V
D WIDE TEMPERATURE RANGE:
−55°C to +125°C
D SINGLE VERSION IN MSOP-8 PACKAGE AND
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 40µA. When shutdown, the
INA321 has a quiescent current of less than 1µA.
Returning to normal operations within microseconds, 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
D INDUSTRIAL SENSOR AMPLIFIERS:
Bridge, RTD, Thermistor, Position
D PHYSIOLOGICAL AMPLIFIERS:
ECG, EEG, EMG
D A/D CONVERTER SIGNAL CONDITIONING
D DIFFERENTIAL LINE RECEIVERS WITH GAIN
D FIELD UTILITY METERS
D PCMCIA CARDS
D COMMUNICATION SYSTEMS
D TEST EQUIPMENT
D AUTOMOTIVE INSTRUMENTATION
120
100
80
60
40
10
CMRR vs FREQUENCY
INA321
Nearest
Competition
10x
Im provement
100
1k
10k
Frequency (Hz)
REF
V_IN−
V_IN+
R₁
160kΩ 40kΩ
40kΩ
RG
R₂
160kΩ
A1
Shutdown
A3
A2
Gain = 5 + 5(R2/R1)
V_OUT = (V_IN+ − V_IN−) • Gain
V+
V−
V_OUT
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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.
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