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1. Description
The INA188IDR 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 .
2. 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)
2. Low Input Noise:
– 12 nV/√Hz at 1 kHz
– 0.25 μVPP (0.1 Hz to 10 Hz)
3. Wide Supply Range:
– Single Supply: 4 V to 36 V
– Dual Supply: ±2 V to ±18 V
4. 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
5. Input Voltage: (V–) + 0.1 V to (V+) – 1.5 V
6. RFI-Filtered Inputs
7. Rail-to-Rail Output
8. Low Quiescent Current: 1.4 mA
9. Operating Temperature: –55°C to +150°C
10. SOIC-8 and DFN-8 Packages
3. Pin Configuration
4. Pin Functions
5. Applications
1. Bridge Amplifiers
2. ECG Amplifiers
3. Pressure Sensors
4. Medical Instrumentation
5. Portable Instrumentation
6. Weigh Scales
7. Thermocouple Amplifiers
8. RTD Sensor Amplifiers
9. Data Acquisition
