1 Features

1• Excellent DC Performance:

– Low Input Offset Voltage: 55 μV (max)

– Low Input Offset Drift: 0.2 μV/°C (max)

– High CMRR: 104 dB, G ≥ 10 (min)

• Low Input Noise:

– 12 nV/√Hz at 1 kHz

– 0.25 μVPP (0.1 Hz to 10 Hz)

• Wide Supply Range:

– Single Supply: 4 V to 36 V

– Dual Supply: ±2 V to ±18 V

• Gain Set with a Single External Resistor:

– Gain Equation: G = 1 + (50 kΩ / RG)

– Gain Error: 0.007%, G = 1

– Gain Drift: 5 ppm/°C (max) G = 1

• Input Voltage: (V–) + 0.1 V to (V+) – 1.5 V

• RFI-Filtered Inputs

• Rail-to-Rail Output

• Low Quiescent Current: 1.4 mA

• Operating Temperature: –55°C to +150°C

• SOIC-8 and DFN-8 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 INA188 is a precision instrumentation amplifier

that uses TI proprietary auto-zeroing techniques to

achieve low offset voltage, near-zero offset and gain

drift, excellent linearity, and exceptionally low-noise

density (12 nV/√Hz) that extends down to dc.

The INA188 is optimized to provide excellent

common-mode rejection of greater than 104 dB (G ≥

10). Superior common-mode and supply rejection

supports high-resolution, precise measurement

applications. The versatile three op-amp design offers

a rail-to-rail output, low-voltage operation from a 4-V

single supply as well as dual supplies up to ±18 V,

and a wide, high-impedance input range. These

specifications make this device ideal for universal

signal measurement and sensor conditioning (such

as temperature or bridge applications).

A single external resistor sets any gain from 1 to

1000. The INA188 is designed to use an industrystandard

gain equation: G = 1 + (50 kΩ / RG). The

reference pin can be used for level-shifting in singlesupply

operation or for an offset calibration.

The INA188 is specified over the temperature range

of –40°C to +125°C .