AD974AR

Overview

The AD974AR is a four-channel, 16-bit data acquisition system operating from a single +5 V supply. It integrates an input multiplexer, a high-speed sampling ADC, and a +2.5 V reference. The device supports throughput rates of 200 kSPS with analog input ranges including –10 V, 0 V to +4 V, and 0 V to +5 V. It features a serial interface for efficient data transfer and includes a power-down mode reducing consumption to 50 mW. The component is housed in a 28-lead SOIC package.

Feature Summary

• Four single-ended analog input channels with selectable voltage ranges
• 16-bit resolution with 200 kSPS throughput rate
• Integrated +2.5 V reference or external reference capability
• Serial interface with internal or external clock options

Applications

• Industrial process control systems
• Data logging equipment
• Portable instrumentation

Procurement Notes

Verify the specific grade (A or B) required for linearity and dynamic range specifications. Confirm the package type matches the design footprint, as the AD974 series includes DIP and SSOP variants alongside the SOIC option. Ensure power supply decoupling meets the datasheet requirements for stable operation.

Selection Notes

Select the A Grade for applications requiring 83 dB S/(N+D) and –3.0 LSB INL, or the B Grade for 85 dB S/(N+D) and –2.0 LSB INL. Consider the power-down feature for battery-operated designs. Verify that the serial interface timing aligns with the host microcontroller's capabilities, particularly regarding internal versus external clock modes.

Part Context

The AD974AR belongs to the AD974 family of data acquisition systems manufactured by Analog Devices. It is part of a broader portfolio of mixed-signal ICs designed for precision measurement applications. The AR suffix denotes the 28-lead Small Outline Integrated Circuit (SOIC) package variant within this product line.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.