INA331
IN
A
3
I
®
3
1
N
A
2
3
3
1
INA2331
SBOS215B – DECEMBER 2001 – REVISED APRIL 2003
Low-Power, Single-Supply, CMOS
INSTRUMENTATION AMPLIFIERS
FEATURES
APPLICATIONS
ꢀ DESIGNED FOR LOW COST
ꢀ INDUSTRIAL SENSOR AMPLIFIERS:
Bridge, RTD, Thermocouple, Position
ꢀ HIGH GAIN ACCURACY: G = 5, 0.02%, 2ppm/°C
ꢀ GAIN SET WITH EXT. RESISTORS FOR > 5V/V
ꢀ LOW OFFSET VOLTAGE: ±250µV
ꢀ PHYSIOLOGICAL AMPLIFIERS:
ECG, EEG, EMG
ꢀ A/D CONVERTER SIGNAL CONDITIONING
ꢀ DIFFERENTIAL LINE RECEIVERS WITH GAIN
ꢀ FIELD UTILITY METERS
ꢀ HIGH CMRR: 94dB DC, 50dB at 45kHz
ꢀ LOW BIAS CURRENT: 0.5pA
ꢀ BANDWIDTH, SLEW RATE: 2.0MHz, 5V/µs
ꢀ RAIL-TO-RAIL OUTPUT SWING: (V+) – 0.02V
ꢀ WIDE TEMPERATURE RANGE: –55°C to +125°C
ꢀ LOW QUIESCENT CURRENT: 490µA max/chan
ꢀ SHUT DOWN: 0.01µA
ꢀ PCMCIA CARDS
ꢀ AUDIO AMPLIFIERS
ꢀ COMMUNICATION SYSTEMS
ꢀ TEST EQUIPMENT
ꢀ AUTOMOTIVE INSTRUMENTATION
ꢀ MSOP-8 SINGLE AND TSSOP-14 DUAL PACKAGES
The INA331 rejects line noise and its harmonics, because
common-mode error remains low even at higher frequencies.
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.
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.
Configured internally in a gain of 5V/V, the INA331 offers
flexibility in higher gains by choosing external resistors.
R1
R2
RG
G = 5 + (5R2/R1)
INA2331
INA331
40kΩ
10kΩ
VREF
40kΩ
Ch A
10kΩ
VOUT
A1
A3
A2
VIN–
Ch B
VIN+
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.
Copyright © 2001-2003, Texas Instruments Incorporated
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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