1 Features
1• Low Offset Voltage: 25 μV (Maximum), G ≥ 100
• Low Drift: 0.1 μV/°C, G ≥ 100
• Low Noise: 50 nV/√Hz, G ≥ 100
• High CMRR: 100 dB (Minimum), G ≥ 10
• Low Input Bias Current: 200 pA (Maximum)
• Supply Range: 1.8 V to 5.5 V
• Input Voltage: (V–) +0.1 V to (V+) –0.1 V
• Output Range: (V–) +0.05 V to (V+) –0.05 V
• Low Quiescent Current: 50 μA
• Operating Temperature: –40°C to +125°C
• RFI Filtered Inputs
• 8-Pin VSSOP and 8-Pin WSON Packages

2 Applications
• Bridge Amplifiers
• ECG Amplifiers
• Pressure Sensors
• Medical Instrumentation
• Portable Instrumentation
• Weigh Scales
• Thermocouple Amplifiers
• RTD Sensor Amplifiers
• Data Acquisition

3 Description
The INA333 device is a low-power, precision
instrumentation amplifier offering excellent accuracy.
The versatile 3-operational amplifier design, small
size, and low power make it ideal for a wide range of
portable applications.
A single external resistor sets any gain from 1 to
1000. The INA333 is designed to use an industrystandard
gain equation: G = 1 + (100 kΩ / RG).
The INA333 device provides very low offset voltage
(25 μV, G ≥ 100), excellent offset voltage drift
(0.1 μV/°C, G ≥ 100), and high common-mode
rejection (100 dB at G ≥ 10). It operates with power
supplies as low as 1.8 V (±0.9 V) and quiescent
current is only 50 μA, making it ideal for batteryoperated
systems. Using autocalibration techniques
to ensure excellent precision over the extended
industrial temperature range, the INA333 device also
offers exceptionally low noise density (50 nV/√Hz)
that extends down to DC.
The INA333 device is available in both 8-pin VSSOP
and WSON surface-mount packages and is specified
over the TA = –40°C to +125°C temperature range.