ADS1211P

Overview

The ADS1211P is a 24-bit analog-to-digital converter (ADC) manufactured by Texas Instruments, utilizing delta-sigma architecture. It features four differential inputs and an integrated programmable gain amplifier (PGA). The device operates on a single 5V supply for both analog and digital domains. Data is transmitted via a standard SPI-compatible serial interface. It is housed in a 28-pin plastic small-outline dual in-line package (PDIP). The component supports sampling rates up to 16 kSPS and functions within a temperature range of -40°C to +85°C.

Feature Summary

• Integrates a multiplexer, programmable gain amplifier, and 24-bit ADC for high-precision signal conditioning
• Supports flexible input configurations with four differential channels or eight single-ended channels
• Provides low-noise performance suitable for precision measurement applications

Applications

• Industrial process control systems requiring high-resolution data acquisition
• Weigh scales and load cell interfaces
• Medical instrumentation such as ECG and blood pressure monitors
• Portable battery-powered test equipment

Procurement Notes

Verify the specific suffix 'P' confirms the PDIP package variant when sourcing. Confirm RoHS compliance status as manufacturing updates may affect material declarations. Check for obsolescence notices or product change notifications prior to final design approval. Ensure availability aligns with long-term production plans given the component's age.

Selection Notes

Select this model if four differential inputs are required, distinguishing it from the single-channel ADS1210. Verify that the 28-pin PDIP footprint fits the target PCB layout constraints. Compare power consumption requirements against other delta-sigma ADCs if battery life is critical. Ensure the SPI interface timing matches the host microcontroller capabilities.

Part Context

The ADS1211P belongs to the ADS121x family of 24-bit delta-sigma ADCs from Texas Instruments. This series is designed for high-accuracy applications where noise rejection and resolution are paramount. The 'P' suffix specifically denotes the through-hole PDIP packaging option, differentiating it from surface-mount variants like the U or N packages.

Replacement Considerations

Direct pin-to-pin replacements may be limited due to the specific PDIP package and legacy status. Evaluate the ADS1211U or ADS1211N for surface-mount alternatives if board redesign is permissible. Consider newer generation devices from Texas Instruments for improved performance metrics, though pin compatibility must be verified.