AD7776ARZ

Overview

The AD7776ARZ 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 10-bit bidirectional data bus (DB0–DB9). The device utilizes a successive approximation register (SAR) architecture and supports an input clock frequency up to 2 MHz. Key electrical specifications include a maximum differential nonlinearity of ±1 LSB, ensuring no missing codes, and a bias offset error of ±12 LSB. The ADC accepts analog input signals within the range of VBIAS ± VSWING, where VBIAS is determined by the reference voltage applied to the REFIN pin. Dynamic performance metrics specify a minimum signal-to-noise and distortion ratio of -56 dB and total harmonic distortion of -60 dB at a sampling rate of 380.95 kHz. The component is housed in a 24-lead SOIC package and functions reliably across an industrial temperature range of -40°C to +85°C.

Feature Summary

• Integrated track-and-hold amplifier allows accurate conversion of input sine waves up to the Nyquist frequency.
• Configurable control register enables selection between normal operating mode and low-power down mode.
• Built-in 2.0 V internal voltage reference output provides bias voltage for input channels.
• Dedicated BUSY/INT logic output indicates A/D converter status or completion of conversion cycles.

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's current documentation to confirm package type and temperature grade. Ensure that the design accommodates the required decoupling capacitor values for the reference input to maintain specified dynamic performance. Confirm compatibility with the host microprocessor's timing constraints for read and write cycles.

Selection Notes

Select this component when a single-channel, high-speed 10-bit resolution is required for servo control or DSP applications. Consider the AD7777ARZ if four simultaneous or sequential channels are needed, or the AD7778ARZ for eight-channel configurations. Evaluate the power-down capability if system energy efficiency during idle periods is a critical design parameter.

Part Context

The AD7776ARZ belongs to the AD7776/AD7777/AD7778 family of LC2MOS high-speed ADCs designed primarily for hard disk drive applications. This family shares a common SAR architecture and control interface but varies in channel count. The 'A' suffix denotes the extended industrial temperature range, while 'RZ' indicates the SOIC package and RoHS compliance.

Replacement Considerations

The AD7776AN is a PDIP package alternative within the same family. For multi-channel requirements, the AD7777 series serves as a direct functional expansion. Verify pinout compatibility and timing parameters before substituting any variant.