24bitADC_Module

Introduction:

The project requires a high-precision sensor because the voltage of the sensor is very low and is easily overwhelmed by noise.

• A high-precision ADC will not be able to resolve the sensor signal
• Front-end op amp does buffering and amplification
• Baseline cache
• Internal resistance adaptation

In order to solve the above problems, the verification version is produced using a module method, which can connect various sensors and avoid separate requirements for making boards.

The op amp can be configured as needed, but the benchmark is more important, so choose a foreign brand.

Chip description

The ADS1251 is a precision, wide dynamic range, delta-sigma analog-to-digital (A/D) converter operating from a single +5V supply with 24-bit resolution. The delta-sigma architecture allows for wide dynamic range and ensures 24-bit dropout-free code performance. For slew rates up to 20kHz, an effective resolution of 19 bits (1.5ppm rms noise) is achieved.

The ADS1251 is designed for high-resolution measurement applications in cardiac diagnostics, smart transmitters, industrial process control, weight scales, chromatography, and portable instrumentation. The converter includes a flexible 2-wire synchronous serial interface for low-cost isolation.

The ADS1251 is a single-channel converter in an SO-8 package. It is pin compatible with the faster ADS1252 (41.7kHz data rate).

feature

• 24-bit—no missing codes
• 19-bit effective resolution up to 20kHz data rate
• Low noise: 1.5ppm
• Differential input
• INL: 15ppm (maximum)
• External reference voltage source (0.5V to 5V)
• power down mode
• synchronous mode
• Low power consumption: 8mW at 20kHz, 5mW at 10kHz
• Application areas
  • cardiac diagnosis
  • direct thermal interface
  • blood analysis
  • Infrared thermoluminizer
  • Liquid/Gas Chromatography
  • Precision process control