Document
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
CMRR (dB)
120
100
80
60
40 10
CMRR vs FREQUENCY
INA321
Nearest Competition
10x Im provement
100 1k Frequency (Hz)
10k
REF
VIN− VIN+
R1
160kΩ 40kΩ
40kΩ
RG R2 160kΩ
A1 Shutdown
A3 A2
Gain = 5 + 5(R2/R1) VOUT = (VIN+ − VIN−) • Gain
V+ V−
VOUT
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.
Copyright 2000-2006, Texas Instruments Incorporated
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INA321 INA2321
SBOS168D − DECEMBER 2000 − REVISED JANUARY 2006
ABSOLUTE MAXIMUM RATINGS(1)
Supply Voltage, V+ to V− . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7.5V Signal Input Terminals Voltage(2) . . . (V−) − (0.5V) to (V+) + (0.5V)
Current(2) . . . . . . . . . . . . . . . . . . . . . 10mA Output Short-Circuit(3) . . . . . . . . . . . . . . . . . . . . . . . . . . Continuous Operating Temperature . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C Storage Temperature . . . . . . . . . . . . . . . . . . . . . . . . −65°C to +150°C Junction Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . +150°C
(1) Stresses above these ratings may cause permanent damage. Exposure to absolute maximum conditions for extended periods may degrade device reliability. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those specified is not supported.
(2) Input terminals are diode-clamped to the power-supply rails. Input signals that can swing more than 0.5V beyond the supply rails should be current limited to 10mA or less.
(3) Short-circuit to ground, one amplifier per package.
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ELECTROSTATIC DISCHARGE SENSITIVITY
This integrated circuit can be damaged by ESD. Texas Instruments recommends that all integrated circuits be handled with appropriate precautions. Failure to observe proper handling and installation procedures can cause damage. ESD damage can range from subtle performance degradation to complete device failure. Precision integrated circuits may be more susceptible to damage because very small parametric changes could cause the device not to meet its published specifications.
PACKAGE/ORDERING INFORMATION(1)
PRODUCT
PACKAGE-LEAD
PACKAGE DESIGNATOR
SPECIFIED TEMPERATURE
RANGE
PACKAGE MARKING
ORDERING NUMBER
TRANSPORT MEDIA, QUANTITY
SINGLE
INA321E
″
MSOP-8
″
DGK
″
−55°C to +125°C
″
C21
″
INA321E/250 INA321E/2K5
Tape and Reel, 250 Tape and Reel, 2500
INA321EA
″
MSOP-8
″
DGK
″
−55°C to +125°C
C21
INA321EA/250 Tape and Reel, 250
″ ″ INA321EA/2K5 Tape and Reel, 3000
.