AD974ARS

Overview

The AD974ARS is a four-channel, 16-bit, 200 kSPS data acquisition system (DAS) fabricated on Analog Devices’ BiCMOS process. It integrates an input multiplexer, a high-speed sampling ADC, and a +2.5 V reference on a single chip. Operating from a single +5 V supply, it supports analog input ranges of –10 V to +10 V, 0 V to +4 V, and 0 V to +5 V. The device features a serial interface for efficient data transfer with minimal interconnects. It includes a power-down mode reducing power dissipation to 50 mW and offers both internal and external reference options.

Feature Summary

• Four single-ended analog input channels with integrated 4-to-1 multiplexer
• 16-bit resolution with 200 kSPS throughput rate
• Single +5 V supply operation with 50 mW power-down mode
• Serial data interface compatible with internal or external clocking

Applications

• Industrial process control systems requiring multi-channel signal acquisition
• Data logging applications with moderate speed and high resolution requirements
• Test and measurement equipment utilizing single-supply architectures

Procurement Notes

Verify the specific grade (A or B) required for integral linearity and dynamic range specifications. Confirm package type compatibility, as the AD974ARS denotes the SSOP variant. Ensure voltage levels match the single +5 V supply requirement. Check for ESD sensitivity precautions during handling and storage.

Selection Notes

Select the AD974ARS when a compact SSOP package is preferred over DIP or SOIC. Choose this component if the application requires four unipolar or bipolar channels without external multiplexers. Consider the internal 2.5 V reference for simplified design, or plan for an external reference if higher precision is needed. Verify that the serial interface timing meets the host controller's capabilities.

Part Context

The AD974 series comprises complete data acquisition systems combining multiplexers, ADCs, and references. The AD974ARS specifically utilizes the RS-28 leaded SSOP package. It is part of Analog Devices' portfolio of mixed-signal ICs designed for cost-effective, high-performance signal conditioning in industrial environments.

Replacement Considerations

Direct pin-compatible replacements within the same family include the AD974BRZ (B Grade, SOIC) or AD974BNZ (B Grade, DIP). Cross-family replacements require careful evaluation of interface protocols, pinouts, and performance parameters such as SNR and linearity.