ADS1251U/2K5G4

Overview

The ADS1251U/2K5G4 is a single-channel, 24-bit Delta-Sigma analog-to-digital converter (ADC) manufactured by Texas Instruments. It operates on a single +5V supply with voltage ranges of 4.75V to 5.25V for both analog and digital domains. The device features a sampling rate up to 20 kSPS and delivers true 24-bit no missing codes performance. It utilizes an external voltage reference ranging from 0.5V to 5V and communicates via a flexible two-wire synchronous serial interface compatible with SPI. Packaged in an 8-pin SOIC, it supports differential inputs and includes synchronization modes for multi-device applications.

Feature Summary

• Provides true 24-bit resolution without missing codes across the full operating range.
• Features low power consumption with typical dissipation of 8mW at 20kHz and 5mW at 10kHz.
• Supports synchronization mode for precise multi-device sampling alignment.
• Includes a dedicated pin for controlling the internal clock or accepting an external clock source.

Applications

• High-precision industrial process control systems
• Medical diagnostics equipment such as electrocardiographs
• Weigh scales and load cell interfaces
• Thermocouple and RTD temperature measurement

Procurement Notes

Verify the specific suffix 'G4' against the manufacturer's current datasheet to confirm RoHS compliance status and lead time requirements. Ensure the ordering part number matches the exact package variant and tape-and-reel quantity specifications defined in the official documentation before finalizing procurement.

Selection Notes

Select this component when high-resolution DC measurement is required with minimal channel count. It is suitable for designs needing low noise performance at moderate data rates. Consider the ADS1252 if higher throughput is necessary, as it shares pin compatibility but offers increased sampling speed.

Part Context

This device belongs to the ADS1251 ResolutionPLUS family of precision ADCs. It is designed for applications demanding high accuracy and low power in a compact form factor. The series is widely used in instrumentation where signal integrity and low drift are critical parameters for system performance.

Replacement Considerations

The ADS1252U is a pin-compatible alternative offering higher sampling rates. Verify interface timing and power requirements when substituting, as performance characteristics differ significantly between the two models.