AU6050
Ultra-stable voltage reference with integrated 24-bit ADC for precision measurement applications.
Product Overview
Description
The AU6050 combines an ultra-stable voltage reference with a high-resolution 24-bit ADC for precision measurement applications. It provides a stable 2.5V or 4.096V reference with ±0.02% accuracy.
The integrated 24-bit delta-sigma ADC achieves 22 noise-free bits with programmable gain from 1x to 128x. It supports differential and single-ended input configurations.
With low drift (±2ppm/°C) and low noise (1μVp-p), the AU6050 is ideal for precision sensor interfaces, data acquisition systems, and test equipment.
Product Series
AU
Primary Application
Precision sensor interfaces
Key Features
- Ultra-stable voltage reference
- 24-bit high-resolution ADC
- Low temperature drift
- Programmable gain amplifier
- Differential and single-ended inputs
- Low power consumption
Specifications
| Reference Voltage | 2.5V or 4.096V |
|---|---|
| Reference Accuracy | ±0.02% |
| Temperature Drift | ±2ppm/°C |
| ADC Resolution | 24-bit |
| Noise-Free Bits | 22 |
| Gain Range | 1x to 128x |
| Package | MSOP-10 |
Applications
Precision sensor interfaces
Sensor signal conditioning
Data acquisition systems
Data acquisition and conversion
Test and measurement equipment
Data acquisition and conversion
Medical instrumentation
Medical electronics
Industrial process control
Industrial automation and control
FAE Expert Insights
"The AU6050 is an excellent choice for precision measurement applications. The integrated reference and ADC saves board space and eliminates reference-to-ADC matching issues. The 2ppm/°C drift is impressive for this price point. I've used it in precision weighing applications with excellent results. The noise performance is good - 22 noise-free bits is achievable with proper layout. The programmable gain is handy for sensors with different output ranges. One tip: use the recommended input RC filter to achieve the best noise performance. Overall, a great integrated solution for precision measurement."
Integrated precision reference and ADC with excellent stability
— Michael Zhang, BeiLuo
Frequently Asked Questions
What is the actual accuracy?
The AU6050 achieves excellent accuracy: (1) Initial accuracy - ±0.02% at 25°C; (2) Temperature drift - ±2ppm/°C (±0.0002%/°C); (3) Long-term drift - <50ppm/1000 hours; (4) Total error over -40°C to +85°C - typically <0.05%. For highest accuracy, allow the device to warm up for 10 minutes after power-on.
±0.02% initial accuracy with ±2ppm/°C drift for precision applications.
How do I minimize noise?
To achieve the best noise performance: (1) Use the recommended input RC filter (typically 100Ω + 0.1μF); (2) Connect analog and digital grounds at a single point; (3) Use a clean power supply with <10mV ripple; (4) Keep input traces short and shielded if possible; (5) Enable the internal digital filter with appropriate settling time. Following these guidelines achieves 22 noise-free bits.
Use input filtering, single-point grounding, and clean supply for best noise performance.
Can I use external reference with the ADC?
Yes, the AU6050 ADC can use an external reference if higher accuracy is required. Connect the external reference to the REFIN pin and disable the internal reference. The external reference should have low noise and good stability. However, for most applications, the integrated reference provides sufficient accuracy and simplifies the design.
Can use external reference, but integrated reference is sufficient for most applications.
What is the settling time for different filter settings?
The AU6050's digital filter settling time depends on the selected output data rate: (1) 10 SPS - 100ms settling time, highest noise rejection; (2) 50 SPS - 20ms settling time, good balance of speed and noise; (3) 100 SPS - 10ms settling time, faster response; (4) 200 SPS - 5ms settling time, fastest response with reduced noise rejection. For multiplexed inputs, add the settling time to the conversion time for total channel switching time. The filter provides sinc4 response with excellent 50/60Hz rejection at lower data rates.
Select data rate based on required response time and noise rejection.
How do I calculate the temperature coefficient error?
Temperature coefficient error calculation: (1) Find operating temperature range (e.g., -40°C to +85°C = 125°C span); (2) Multiply by temperature coefficient (±2ppm/°C); (3) Calculate total drift: 125°C × 2ppm/°C = 250ppm = 0.025%; (4) Add to initial accuracy (±0.02%) for total error: ±0.045% over temperature range. For highest accuracy applications, consider calibration at the operating temperature or use the device's internal temperature sensor for compensation.
Calculate total error as initial accuracy plus temperature drift over operating range.