Overview
The INA188 is a precision instrumentation amplifier produced by Texas Instruments. It utilizes TI's proprietary auto-zeroing techniques to achieve low offset voltage, near-zero offset and gain drift, and excellent linearity. This amplifier is designed to provide exceptionally low-noise density, extending down to DC, and superior common-mode and supply rejection, making it ideal for high-resolution, precise measurement applications.
The INA188 operates with a wide supply range, supporting both single and dual supply configurations from 4 V to 36 V and ±2 V to ±18 V, respectively. It features a rail-to-rail output and a high-impedance input range, making it versatile for various signal measurement and sensor conditioning tasks.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Input Offset Voltage (VOSI) | ±25 | ±55 | μV | |
| Input Offset Drift | ±0.08 | ±0.2 | μV/°C | |
| Common-Mode Rejection Ratio (CMRR) | 104 | dB (G ≥ 10) | ||
| Input Voltage Noise | 12.5 | nV/√Hz at 1 kHz | ||
| Supply Voltage Range (Single) | 4 | 36 | V | |
| Supply Voltage Range (Dual) | ±2 | ±18 | V | |
| Gain Error | 0.007% | |||
| Gain Drift | 5 | 50 | ppm/°C (G > 1) | |
| Quiescent Current | 1.4 | 1.6 | 1.8 | mA |
| Operating Temperature Range | –55 | 150 | °C |
Key Features
- Excellent DC performance with low input offset voltage (±55 μV max) and low input offset drift (±0.2 μV/°C max).
- Low input noise: 12 nV/√Hz at 1 kHz and 0.25 μVPP from 0.1 Hz to 10 Hz.
- Wide supply range: Single supply from 4 V to 36 V and dual supply from ±2 V to ±18 V.
- Gain set with a single external resistor using the equation G = 1 + (50 kΩ / RG).
- Rail-to-rail output and high-impedance input range.
- Low quiescent current of 1.4 mA.
- Operating temperature range from –55°C to 150°C.
- Available in SOIC-8 and DFN-8 packages.
Applications
- Bridge amplifiers.
- ECG amplifiers.
- Pressure sensors.
- Medical instrumentation.
- Portable instrumentation.
- Weigh scales.
- Thermocouple amplifiers.
- RTD sensor amplifiers.
- Data acquisition.
Q & A
- What is the maximum input offset voltage of the INA188?
The maximum input offset voltage of the INA188 is ±55 μV.
- How is the gain of the INA188 set?
The gain of the INA188 is set using a single external resistor with the equation G = 1 + (50 kΩ / RG).
- What is the common-mode rejection ratio (CMRR) of the INA188?
The CMRR of the INA188 is greater than 104 dB for gains of 10 or more.
- What is the input voltage noise of the INA188 at 1 kHz?
The input voltage noise of the INA188 at 1 kHz is 12.5 nV/√Hz.
- What are the available package types for the INA188?
The INA188 is available in SOIC-8 and DFN-8 packages.
- What is the operating temperature range of the INA188?
The operating temperature range of the INA188 is from –55°C to 150°C.
- What is the quiescent current of the INA188?
The quiescent current of the INA188 is 1.4 mA.
- Can the INA188 be used in medical instrumentation?
Yes, the INA188 can be used in medical instrumentation due to its high precision and low noise characteristics.
- What is the bandwidth of the INA188 at a gain of 1?
The bandwidth of the INA188 at a gain of 1 is 600 kHz.
- How does the INA188 handle RFI?
The INA188 has RFI-filtered inputs to mitigate radio-frequency interference.
