AD974BR

Overview

The AD974BR is a four-channel, 16-bit, 200 kSPS data acquisition system fabricated on Analog Devices' BiCMOS process. It integrates an input multiplexer, a high-speed sampling ADC, and a +2.5 V reference, operating from a single +5 V supply. The device supports analog input ranges of –10 V to +10 V, 0 V to +4 V, and 0 V to +5 V. It features a serial interface for efficient data transfer with minimal interconnects. Key specifications include a maximum power dissipation of 120 mW in active mode and 50 mW in power-down mode. The part is available in a 28-lead SOIC package.

Feature Summary

• Four single-ended analog input channels with selectable voltage ranges (–10 V to +10 V, 0 V to +4 V, 0 V to +5 V).
• 16-bit resolution with 200 kSPS throughput rate and integral linearity error of ±2.0 LSB (B Grade).
• Integrated +2.5 V internal reference or provision for external reference input.
• Serial data interface compatible with standard microcontrollers, supporting internal or external clock modes.

Applications

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

Procurement Notes

Verify the specific grade (A or B) and package type (SOIC vs SSOP vs DIP) when ordering, as performance parameters like INL and SNR vary by grade. Ensure the supplier provides the original manufacturer datasheet to confirm revision level and electrical characteristics. Check for RoHS compliance status if required by local regulations.

Selection Notes

Select the AD974BR for applications requiring four channels of 16-bit acquisition at 200 kSPS with a single +5 V supply. Compare against the AD974AR if a lower cost option with slightly higher nonlinearity error (±3.0 LSB) is acceptable. Consider the AD974BNZ if through-hole packaging is preferred over surface mount. Verify that the input signal ranges match the configured unipolar or bipolar settings.

Part Context

The AD974 series represents a complete data acquisition system combining multiplexing, analog-to-digital conversion, and reference generation on a single chip. The 'BR' suffix denotes the B Grade version housed in a 28-lead Small Outline Integrated Circuit (SOIC) package. This component is part of Analog Devices' portfolio designed for efficient interfacing and comprehensive AC/DC parameter testing.

Replacement Considerations

The AD974AR serves as a direct pin-compatible alternative with A Grade specifications. For through-hole implementations, the AD974BNZ offers identical functionality in a 28-lead PDIP package. No other manufacturers produce functionally equivalent integrated 4-channel 16-bit DAS with this specific form factor and interface.