INA333
www.ti.com ...................................................................................................................................................................................................... SBOS445–JULY 2008
Micro-Power (50µA), Zerø-Drift, Rail-to-Rail Out
Instrumentation Amplifier
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FEATURES
DESCRIPTION
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LOW OFFSET VOLTAGE: 25µV (max), G ≥ 100
The INA333 is a low-power, precision instrumentation
amplifier offering excellent accuracy. The versatile
3-op amp design, small size, and low power make it
ideal for a wide range of portable applications.
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LOW DRIFT: 0.1µV/°C, G ≥ 100
LOW NOISE: 50nV/√Hz, G ≥ 100
HIGH CMRR: 100dB (min), G ≥ 10
A single external resistor sets any gain from 1 to
1000. The INA333 is designed to use an
industry-standard gain equation: G = 1 + (100kΩ/RG).
LOW INPUT BIAS CURRENT: 200pA (max)
SUPPLY RANGE: +1.8V to +5.5V
INPUT VOLTAGE: (V–) +0.1V to (V+) –0.1V
OUTPUT RANGE: (V–) +0.05V to (V+) –0.05V
LOW QUIESCENT CURRENT: 50µA
OPERATING TEMPERATURE: –40°C to +125°C
RFI FILTERED INPUTS
The INA333 provides very low offset voltage (25µV,
G ≥ 100), excellent offset voltage drift (0.1µV/°C,
G ≥ 100), and high common-mode rejection (100dB
at G ≥ 10). It operates with power supplies as low as
1.8V (±0.9V), and quiescent current is only
50µA—ideal for battery-operated systems. Using
autocalibration techniques to ensure excellent
precision over the extended industrial temperature
range, the INA333 also offers exceptionally low noise
density (50nV/√Hz) that extends down to dc.
MSOP-8 AND DFN-8 PACKAGES
APPLICATIONS
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BRIDGE AMPLIFIERS
ECG AMPLIFIERS
The INA333 is available in both MSOP-8 and DFN-8
surface-mount packages and is specified over the
TA = –40°C to +125°C temperature range.
PRESSURE SENSORS
MEDICAL INSTRUMENTATION
PORTABLE INSTRUMENTATION
WEIGH SCALES
THERMOCOUPLE AMPLIFIERS
RTD SENSOR AMPLIFIERS
DATA ACQUISITION
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V+
7
2
VIN-
RFI Filtered Inputs
150kW
150kW
A1
RFI Filtered Inputs
1
50kW
6
5
VOUT
A3
RG
50kW
8
3
RFI Filtered Inputs
RFI Filtered Inputs
150kW
150kW
REF
A2
VIN+
INA333
4
100kW
V-
G = 1 +
RG
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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.
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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 the Texas
Instruments standard warranty. Production processing does not
necessarily include testing of all parameters.
Copyright © 2008, Texas Instruments Incorporated
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