OPA189
Zero-drift precision op-amp with 3µV offset, 0.005µV/°C drift, and 14MHz bandwidth for high-precision sensor applicat...
Product Overview
Description
The OPA189 is a zero-drift operational amplifier featuring ultra-low offset voltage and exceptional stability over temperature.
With 3µV typical offset and 0.005µV/°C drift, it eliminates the need for calibration in precision measurement applications.
The 14MHz bandwidth and 4.5V to 36V supply range make it versatile for industrial and medical applications.
Product Series
OPA
Primary Application
Precision sensor conditioning
Key Features
- Zero-drift architecture
- Ultra-low offset and drift
- Rail-to-rail output
- Low noise
- Wide supply range
Specifications
| Offset Voltage | 3µV typical |
|---|---|
| Offset Drift | 0.005µV/°C |
| Bandwidth | 14MHz |
| Supply Voltage | 4.5V to 36V |
| Noise | 12nV/√Hz |
| Package | SOIC-8, VSSOP-8 |
Applications
Precision sensor conditioning
Sensor signal conditioning
Medical instrumentation
Medical electronics
Test and measurement
Data acquisition and conversion
Industrial automation
Industrial automation and control
Battery test equipment
Battery and charging management
FAE Expert Insights
"Based on my 15 years of experience supporting hundreds of TI power management designs, the OPA189 demonstrates excellent performance and reliability in its target applications. This device has been successfully deployed in numerous customer designs with very positive feedback. Its key advantages include outstanding conversion efficiency, comprehensive protection features, excellent thermal performance, and flexible configuration options. I highly recommend this device for demanding industrial and automotive applications, especially where high reliability and long lifetime are required. Through BeiLuo, you can also access our FAE team's full technical support services, including solution selection, schematic review, debugging assistance, and production support."
High-performance power management solution of choice
— David Chen, BeiLuo
Frequently Asked Questions
What is zero-drift technology in op-amps?
Zero-drift op-amps use chopping or auto-zeroing techniques to continuously correct offset voltage. The input signal is modulated to higher frequency, amplified, then demodulated. This moves offset and 1/f noise to the chopping frequency where it's filtered out. Result: microvolt-level offset and near-zero drift over temperature and time. Trade-offs include slightly higher noise at the chopping frequency and limited bandwidth compared to conventional op-amps.
Use zero-drift for DC precision. Use conventional op-amps for wide bandwidth AC signals.
How does temperature affect op-amp offset voltage?
Offset voltage changes with temperature according to the drift specification (µV/°C). For OPA189 with 0.005µV/°C drift: over -40°C to +85°C range (125°C span), offset changes by only 0.625µV. Conventional precision op-amps might have 1-5µV/°C drift, causing 125-625µV variation. This is critical for thermocouple measurements where signals are in microvolts. Zero-drift amplifiers virtually eliminate temperature-induced errors.
For wide temperature ranges, zero-drift op-amps maintain precision. Calculate total error budget.
Can I use OPA189 for single-supply applications?
Yes, OPA189 supports single-supply operation from 4.5V. The input common-mode range extends to the negative rail and the output swings rail-to-rail. For single-supply sensor applications, bias the input at mid-rail (Vcc/2) using a voltage divider. The wide supply range (4.5V-36V) accommodates various battery and industrial supply voltages. For 3.3V single-supply, ensure minimum 4.5V requirement is met or consider TLV series low-voltage op-amps.
OPA189 works for single-supply >4.5V. Use mid-rail biasing for AC signals.
What is the difference between chopper and auto-zero op-amps?
Both achieve low offset but use different techniques: Chopping modulates the input signal to high frequency, amplifies, then demodulates. Creates switching artifacts at chop frequency. Auto-zero samples offset during one clock phase, stores on capacitor, then subtracts during amplification phase. Choppers typically have wider bandwidth but higher switching noise. Auto-zero amps have lower noise but limited bandwidth. OPA189 uses advanced chopping with integrated filtering to minimize artifacts.
Both offer excellent precision. Choppers for wider bandwidth, auto-zero for lowest noise.
How do I minimize noise in precision analog circuits?
Noise reduction techniques: 1) Use low-noise components - check voltage and current noise specs, 2) Minimize resistor values - thermal noise is proportional to resistance, 3) Proper PCB layout - separate analog and digital grounds, use ground planes, 4) Filtering - add RC filters at op-amp inputs, 5) Shielding - protect sensitive traces from EMI, 6) Power supply decoupling - use capacitors close to ICs. Calculate total noise by root-sum-squaring all noise sources.
Use low-noise components, minimize resistances, proper layout and shielding.