AD7776AR-REEL

Overview

The AD7776AR-REEL 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 data interface with a maximum throughput of 378 kS/s. The device utilizes an LC2MOS architecture for fast conversion times and includes a track-and-hold amplifier to support input frequencies up to the Nyquist limit. Key electrical parameters include a resolution of 10 bits, a differential nonlinearity of ±1 LSB max, and a signal-to-noise and distortion ratio of -56 dB min. 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 to accurately capture high-frequency analog signals up to 189 kHz.
• Supports power-down mode via control register configuration to minimize current consumption when idle.
• Provides a dedicated BUSY/INT output pin that can be configured as either a busy flag or an interrupt signal.
• Includes an internal voltage reference output at REFOUT to simplify biasing requirements for analog inputs.

Applications

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

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific REEL packaging suffix matches inventory records. Check for RoHS compliance status as indicated in official documentation. Ensure storage conditions adhere to moisture sensitivity levels to prevent damage prior to soldering.

Selection Notes

Select this model for applications requiring a single-channel, high-speed 10-bit ADC with a parallel interface. Consider the AD7777 or AD7778 if multiple simultaneous sampling channels are required instead of a single channel. Evaluate the parallel bus timing constraints against the host microprocessor's capabilities to ensure compatible interfacing speeds.

Part Context

This component belongs to the AD7776/AD7777/AD7778 family of LC2MOS high-speed ADCs designed primarily for hard disk drive servo applications. The 'A' suffix denotes the industrial temperature range (-40°C to +85°C), while 'R' indicates the SOIC package option. The 'REEL' suffix specifies tape-and-reel packaging for automated assembly processes.

Replacement Considerations

The AD7777AR and AD7778AS offer multi-channel variants within the same family. Verify pin compatibility and software register configurations when substituting these models, as channel counts and control register addresses differ significantly from the single-channel AD7776.