Overview
The INA188IDR 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, excellent linearity, and exceptionally low-noise density. This amplifier is designed to provide high-resolution, precise measurement capabilities, making it ideal for universal signal measurement and sensor conditioning applications such as temperature, bridge, and medical instrumentation.
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 Noise Density | 12 | nV/√Hz at 1 kHz | ||
| Input Noise (0.1 Hz to 10 Hz) | 0.25 | μVPP | ||
| Supply Voltage Range (Single Supply) | 4 | 36 | V | |
| Supply Voltage Range (Dual Supply) | ±2 | ±18 | V | |
| Gain Range | 1 | 1000 | ||
| Gain Error (G = 1) | 0.007% | |||
| Gain Drift (G = 1) | 5 | ppm/°C | ||
| Operating Temperature Range | –40 | 125 | °C | |
| Quiescent Current | 1.4 | mA | ||
| Package Types | SOIC-8, DFN-8 |
Key Features
- Excellent DC Performance: Low input offset voltage (55 μV max), low input offset drift (0.2 μV/°C max), and high CMRR (104 dB, G ≥ 10 min).
- Low Input Noise: 12 nV/√Hz at 1 kHz and 0.25 μVPP (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: Gain equation G = 1 + (50 kΩ / RG), with gain error of 0.007% and gain drift of 5 ppm/°C (G = 1).
- RFI-Filtered Inputs and Rail-to-Rail Output.
- Low Quiescent Current: 1.4 mA.
- Operating Temperature Range: –55°C to +150°C, specified over –40°C to +125°C.
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.
- What is the common-mode rejection ratio (CMRR) of the INA188?
The CMRR of the INA188 is greater than 104 dB for gains greater than or equal to 10.
- What is the input noise density of the INA188 at 1 kHz?
The input noise density of the INA188 at 1 kHz is 12 nV/√Hz.
- What is the supply voltage range for the INA188?
The INA188 can operate from a single supply of 4 V to 36 V and a dual supply of ±2 V to ±18 V.
- How is the gain set for the INA188?
The gain is set using a single external resistor with the gain equation G = 1 + (50 kΩ / RG).
- What is the quiescent current of the INA188?
The quiescent current of the INA188 is 1.4 mA.
- What are the package types available for the INA188?
The INA188 is available in SOIC-8 and DFN-8 packages.
- What is the operating temperature range for the INA188?
The INA188 is specified over the temperature range of –40°C to +125°C and can operate from –55°C to +150°C.
- What are some common applications of the INA188?
The INA188 is commonly used in bridge amplifiers, ECG amplifiers, pressure sensors, medical instrumentation, portable instrumentation, weigh scales, thermocouple amplifiers, RTD sensor amplifiers, and data acquisition.
- Does the INA188 have RFI-filtered inputs?
Yes, the INA188 has RFI-filtered inputs.
