Overview
The OPA4189IDR from Texas Instruments is a high-precision, quad-channel operational amplifier designed for applications requiring ultra-low noise, zero-drift, and high dynamic performance. This device is part of the OPAx189 family, which includes the OPA189 and OPA2189, and is distinguished by its MUX-friendly architecture and controlled start-up system. The OPA4189IDR offers rail-to-rail output operation, making it suitable for a wide range of precision instrumentation and signal measurement tasks.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Input Offset Voltage | ±0.4 to ±3 | µV |
| Input Offset Voltage Drift | ±0.005 to ±0.03 | µV/°C |
| Common-Mode Rejection Ratio (CMRR) | 168 | dB |
| Open-Loop Gain | 170 | dB |
| Input Voltage Noise Density | 5.2 | nV/√Hz at 1 kHz |
| Gain Bandwidth | 14 | MHz |
| Slew Rate | 20 | V/µs |
| Supply Voltage Range | 4.5 to 36 | V |
| Quiescent Current | 1.7 | mA (maximum) |
| Operating Temperature Range | –40 to +125 | °C |
Key Features
- Ultra-high precision: Zero-drift of 0.005 µV/°C and ultra-low offset voltage of 3 µV maximum.
- Excellent DC precision: High CMRR of 168 dB and open-loop gain of 170 dB.
- Low noise: Input voltage noise density of 5.2 nV/√Hz at 1 kHz and 0.1 µVPP from 0.1 Hz to 10 Hz.
- Fast settling and dynamic performance: Gain bandwidth of 14 MHz and slew rate of 20 V/µs.
- MUX-friendly inputs: Prevents inrush current when applying large input differential voltages.
- Robust design: RFI/EMI filtered inputs and robust ESD protection.
- Rail-to-rail output: Output includes negative rail.
Applications
- Battery test and monitoring: Precise voltage measurement.
- Analog input modules: High-precision signal conditioning.
- Weigh scales: Accurate weight measurement.
- DC power supplies and AC sources: Stable and precise voltage regulation.
- Electronic loads and multifunction relays: Reliable and precise control.
Q & A
- What is the input offset voltage of the OPA4189IDR?
The input offset voltage of the OPA4189IDR is ±0.4 to ±3 µV. - What is the input offset voltage drift over temperature for the OPA4189IDR?
The input offset voltage drift is ±0.005 to ±0.03 µV/°C. - What is the common-mode rejection ratio (CMRR) of the OPA4189IDR?
The CMRR is 168 dB. - What is the gain bandwidth of the OPA4189IDR?
The gain bandwidth is 14 MHz. - What is the slew rate of the OPA4189IDR?
The slew rate is 20 V/µs. - What is the supply voltage range for the OPA4189IDR?
The supply voltage range is 4.5 to 36 V. - What is the quiescent current of the OPA4189IDR?
The quiescent current is 1.7 mA (maximum). - What is the operating temperature range for the OPA4189IDR?
The operating temperature range is –40 to +125 °C. - What makes the OPA4189IDR suitable for MUX applications?
The OPA4189IDR has MUX-friendly inputs that prevent inrush current when applying large input differential voltages. - What kind of noise performance does the OPA4189IDR offer?
The OPA4189IDR offers low noise with an input voltage noise density of 5.2 nV/√Hz at 1 kHz and 0.1 µVPP from 0.1 Hz to 10 Hz.
