INA331 Datasheet, PDF (1/17 Pages) Texas Instruments – Low-Power, Single-Supply, CMOS INSTRUMENTATION AMPLIFIERS

INA331
INA2331 ®
INA331
INA2331
SBOS215B – DECEMBER 2001 – REVISED APRIL 2003
Low-Power, Single-Supply, CMOS
INSTRUMENTATION AMPLIFIERS
FEATURES
q DESIGNED FOR LOW COST
q HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C
q GAIN SET WITH EXT. RESISTORS FOR > 5V/V
q LOW OFFSET VOLTAGE: ±250µV
q HIGH CMRR: 94dB DC, 50dB at 45kHz
q LOW BIAS CURRENT: 0.5pA
q BANDWIDTH, SLEW RATE: 2.0MHz, 5V/µs
q RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.02V
q WIDE TEMPERATURE RANGE: –55°C to +125°C
q LOW QUIESCENT CURRENT: 490µA max/chan
q SHUT DOWN: 0.01µA
q MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES
DESCRIPTION
The INA331 and INA2331 are rail-to-rail output, low-power
CMOS instrumentation amplifiers that offer wide range, single-
supply operation as well as bipolar-supply operation. The
INA331 family provides low-cost, low-noise amplification of
differential signals with a low quiescent current of 415µA
(dropping to 0.01µA when shutdown). Returning to normal
operation within microseconds, this INA can be used for
battery or multi-channel applications.
Configured internally in a gain of 5V/V, the INA331 offers
flexibility in higher gains by choosing external resistors.
APPLICATIONS
q INDUSTRIAL SENSOR AMPLIFIERS:
Bridge, RTD, Thermocouple, Position
q PHYSIOLOGICAL AMPLIFIERS:
ECG, EEG, EMG
q A/D CONVERTER SIGNAL CONDITIONING
q DIFFERENTIAL LINE RECEIVERS WITH GAIN
q FIELD UTILITY METERS
q PCMCIA CARDS
q AUDIO AMPLIFIERS
q COMMUNICATION SYSTEMS
q TEST EQUIPMENT
q AUTOMOTIVE INSTRUMENTATION
The INA331 rejects line noise and its harmonics, because
common-mode error remains low even at higher frequencies.
High bandwidth and slew rate makes the INA331 ideal for
directly driving sampling Analog-to-Digital (A/D) converters
as well as general-purpose applications.
With high precision, low cost, and small packages, the
INA331 outperforms discrete designs.
Additionally, because they are specified for wide temperature
range of –55°C to +125°C and operating range of –65°C to
+150°C, they can be used in demanding industrial and
automotive environments.
V_REF
V_IN–
V_IN+
R₁
G = 5 + (5R₂/R₁)
40kΩ
10kΩ
10kΩ
A1
40kΩ
A2
R₂
R_G
INA331
A3
V_OUT
INA2331
Ch A
Ch B
V+ V–
Shutdown
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.
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.
www.ti.com
Copyright © 2001-2003, Texas Instruments Incorporated