ADS1256 24-bit ADC data acquisition module with 8 input channels (ADC8 road). Features low noise, SPI interface, and 3V analog input range.
What Matters Most in a High-Precision ADC?
- Besides having high resolution, a high-quality voltage reference is absolutely critical for accurate and stable analog-to-digital conversion.
- Ultra-Low Temperature Coefficient (< 3 ppm/°C):
- This means that for every 1°C change in temperature, the voltage reference drifts by only 3 parts per million
- High Initialization Accuracy (< ±0.1%):
- This error margin between the output voltage and the reference voltage ensures consistent performance across multiple units, which is crucial for repeatable and reliable results.
- Low Noise (< 10 µV peak-to-peak):
- Noise from the voltage reference directly impacts ADC accuracy. By applying a 0.1–10 Hz low-pass filter (using an OPA350 buffer, high-quality capacitors, and low-noise metal film resistors), low-frequency noise is effectively suppressed, further improving precision.
- 8 Analog Input Channels (A0–A7): Configurable as single-ended or differential inputs
- Composed of SMD Components:
- Vishay wafer metal film resistors
- Input filter capacitors (104) on each channel for noise reduction
- High-speed, low-noise LDO regulator with high power rejection ratio and low static current
- Voltage Reference and Filtering:
- ADR03 2.5V voltage reference buffered by an OPA350 amplifier
- 0.1–10 Hz low-pass filter with large copper and ceramic capacitors and metal film resistors
- Power Supply Filtering:
- LC filter circuit composed of 100 µF capacitor and inductor
- Separate Grounds: Dedicated analog and digital ground wiring to reduce interference
- Debugging Convenience: Test points for GND, 2.5V, and 3.3V voltages
- Ideal For: Electronics enthusiasts, precision instrumentation, and high-accuracy data acquisition projects
- Package Contents:
- 1 × ADS1256 ADC Module Board
- 3 × Header Pins
