Overview
The OPA2189IDR from Texas Instruments is a dual-channel, high-precision operational amplifier known for its ultra-low noise, zero-drift, and high-speed performance. This device is part of the OPAx189 family, which includes the OPA189 and OPA4189, and is designed to provide excellent DC precision and dynamic performance. The OPA2189IDR features a unique MUX-friendly input architecture, rail-to-rail output operation, and robust ESD protection, making it an ideal choice for precision instrumentation, signal measurement, and active filtering applications.
Key Specifications
| Parameter | Min | Typ | Max | Unit |
|---|---|---|---|---|
| Supply Voltage (Single-Supply) | 4.5 | 36 | V | |
| Supply Voltage (Dual-Supply) | ±2.25 | ±18 | V | |
| Input Offset Voltage | ±0.4 | ±3 | ±8 | µV |
| Input Offset Voltage Drift | ±0.006 | ±0.015 | ±0.03 | µV/°C |
| Common-Mode Rejection Ratio (CMRR) | 168 | dB | ||
| Open-Loop Gain | 170 | dB | ||
| Gain Bandwidth | 14 | MHz | ||
| Slew Rate | 20 | V/µs | ||
| Input Voltage Noise Density at 1 kHz | 5.2 | nV/√Hz | ||
| Quiescent Current | 1.7 | mA | ||
| Operating Temperature Range | -40 | 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: 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 noise from 0.1 Hz to 10 Hz.
- Dynamic performance: Gain bandwidth of 14 MHz, slew rate of 20 V/µs, and fast settling time (10-V step, 0.01% in 1.1 µs).
- MUX-friendly inputs: Prevents inrush current when applying large input differential voltages, improving settling performance in multichannel systems.
- Robust design: RFI/EMI filtered inputs and robust ESD protection.
- Wide supply range: Operates from 4.5 V to 36 V single-supply or ±2.25 V to ±18 V dual-supply.
- Rail-to-rail output: Output includes negative rail.
Applications
- Battery test and measurement: High precision and low noise make it suitable for battery testing.
- Analog input modules: Ideal for precision signal conditioning in analog input modules.
- Weigh scales: Used in precision weighing applications due to its high accuracy and stability.
- DC power supply, AC source, and electronic load: Suitable for various power supply and load applications requiring high precision.
- Multifunction relays: Used in relay systems that require precise signal handling.
Q & A
- What is the input offset voltage of the OPA2189IDR?
The input offset voltage of the OPA2189IDR is ±0.4 µV to ±8 µV over the temperature range of -40°C to 125°C.
- What is the gain bandwidth of the OPA2189IDR?
The gain bandwidth of the OPA2189IDR is 14 MHz.
- What is the slew rate of the OPA2189IDR?
The slew rate of the OPA2189IDR is 20 V/µs.
- What is the common-mode rejection ratio (CMRR) of the OPA2189IDR?
The CMRR of the OPA2189IDR is 168 dB.
- What is the operating temperature range of the OPA2189IDR?
The operating temperature range of the OPA2189IDR is -40°C to 125°C.
- What are the typical applications of the OPA2189IDR?
The OPA2189IDR is typically used in battery test and measurement, analog input modules, weigh scales, DC power supply, AC source, electronic load, and multifunction relays.
- What is the quiescent current of the OPA2189IDR?
The quiescent current of the OPA2189IDR is 1.7 mA maximum.
- Does the OPA2189IDR have rail-to-rail output?
Yes, the OPA2189IDR has rail-to-rail output operation.
- What is the input voltage noise density of the OPA2189IDR at 1 kHz?
The input voltage noise density of the OPA2189IDR at 1 kHz is 5.2 nV/√Hz.
- Is the OPA2189IDR MUX-friendly?
Yes, the OPA2189IDR has a MUX-friendly input architecture that prevents inrush current when applying large input differential voltages.
