AD7776AR

Overview

The AD7776AR is a high-speed, single-channel, 10-bit analog-to-digital converter (ADC) from Analog Devices. It operates on a single +5 V supply and features a parallel interface with a throughput rate of up to 378 kS/s. The device utilizes a successive approximation register (SAR) architecture and includes an internal voltage reference output. Key electrical specifications include a signal-to-noise and distortion ratio of -56 dB minimum, total harmonic distortion of -60 dB minimum, and differential nonlinearity of ±1 LSB maximum. It functions within a temperature range of -40°C to +85°C and is housed in a 24-lead SOIC package.

Feature Summary

• Integrates a track-and-hold amplifier capable of handling input frequencies up to the Nyquist limit at maximum throughput rates.
• Includes a configurable control register that allows selection between normal operating mode and power-down mode for optimized energy consumption.
• Features a BUSY/INT status output pin that can be programmed to indicate either active conversion periods or completion of conversions.

Applications

• Read/write head positioning servos in high-density hard disk drives
• General-purpose instrumentation systems requiring fast data acquisition
• Digital signal processing applications such as voice recognition and echo cancellation

Procurement Notes

Verify the specific ordering suffix 'R' corresponds to the SOIC package option when sourcing components. Confirm that the required channel count matches the single-channel specification of this model, as other variants in the family offer four or eight channels. Ensure compatibility with the specified +5 V logic levels and clock frequency requirements during component validation.

Selection Notes

Select this component when a single-channel solution is sufficient, as the AD7777 and AD7778 provide four and eight channels respectively. Consider the parallel interface requirement and the need for a +5 V supply voltage. Evaluate the dynamic performance specifications against the requirements of digital signal processing tasks to ensure adequate signal fidelity.

Part Context

This part belongs to the AD7776/AD7777/AD7778 family of LC2MOS high-speed ADCs. While the AD7776AR provides one channel, the AD7777AR offers four channels and the AD7778AS provides eight channels. All variants share similar architectural features and are designed for high-speed data acquisition applications.

Replacement Considerations

Direct functional substitutes within the same family include the AD7777AR for multi-channel requirements. Verify pinout compatibility if replacing with other members of the series, as channel counts differ significantly between the single, quad, and octal versions.