AD7777AR-REEL

Overview

The AD7777AR-REEL is a quad-channel, 10-bit successive approximation analog-to-digital converter manufactured by Analog Devices Inc. It operates within an ambient temperature range of -40°C to +85°C and utilizes a 28-lead SOIC package (RW-28). The device features a parallel data interface with DB0–DB9 lines and accepts a single-ended input voltage range defined as VBIAS ± VSWING. Powered by a nominal 5 V supply (4.75 V to 5.25 V), it achieves a maximum sampling rate of 378 kS/s using an 8 MHz CLKIN. Key dynamic performance metrics include a minimum Signal-to-Noise and Distortion ratio of -56 dB and a Total Harmonic Distortion of -60 dB min at full-scale sine wave inputs.

Feature Summary

• Quad-channel architecture supporting independent or simultaneous sampling configurations via control register settings.
• Integrated track-and-hold amplifiers enabling accurate conversion of high-frequency analog signals up to the Nyquist limit.
• Configurable BUSY/INT output pin that functions as either a status flag during conversion or an interrupt signal upon completion.
• Internal reference output capability providing a stable bias voltage for analog input channels.

Applications

• Digital signal processing systems requiring voice recognition or echo cancellation capabilities.
• Adaptive filtering applications demanding precise dynamic characterizations.
• Microprocessor interfacing with DSP machines such as the TMS320 family.
• Multi-channel data acquisition systems utilizing parallel bus architectures.

Procurement Notes

Verify the specific REEL suffix against manufacturer documentation to confirm tape-and-reel packaging specifications. Ensure the ordering code matches the required channel count and package style. Cross-reference the datasheet revision to validate electrical parameters before finalizing procurement orders.

Selection Notes

Select this component when four independent 10-bit conversions are required in a single integrated circuit. Consider the parallel interface requirements and the 5 V logic compatibility. Evaluate the power-down mode functionality if energy efficiency during idle periods is a critical design constraint.

Part Context

This part belongs to the AD7776/AD7777/AD7778 family of high-speed ADCs. While the AD7776 offers one channel and the AD7778 provides eight, the AD7777 specifically bridges these options with four channels. All variants share identical core SAR architecture and timing specifications.

Replacement Considerations

The AD7776AR and AD7778AR serve as functional alternatives within the same family, differing only in channel count. Verify pinout compatibility and control register mapping when substituting between these models.