AD7856ANZ

Overview

The AD7856ANZ is an 8-channel, 14-bit successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices. It operates from a single 5 V supply and supports throughput rates up to 285 kSPS with a typical power dissipation of 60 mW in normal mode. The device features a flexible serial interface compatible with SPI, QSPI, 8051, and microprocessor standards. It includes internal self-calibration and system calibration capabilities to maintain accuracy over temperature variations. The input range spans from 0 V to the reference voltage, supporting eight single-ended or four pseudo-differential channels.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy and stability across varying temperatures.
• Flexible serial communication interface supports multiple standard protocols including SPI, QSPI, and 8051 compatibility.
• Low power architecture provides automatic power-down modes to minimize energy consumption during idle periods.

Applications

• Battery-powered personal digital assistants and mobile communications devices
• Medical instrumentation requiring precise signal acquisition
• Pen computers and portable data collection systems
• Industrial instrumentation and control systems

Procurement Notes

Verify component authenticity through authorized distributors or direct manufacturer channels. Confirm the specific grade version matches application requirements, as performance specifications vary between A and K grades regarding clock frequency and operating temperature ranges. Ensure proper handling procedures are followed due to electrostatic discharge sensitivity.

Selection Notes

Select the AD7856ANZ when an 8-channel multiplexed ADC with 14-bit resolution is required for single-supply applications. Consider the package constraints of the 24-lead DIP format against available board space. Evaluate the need for internal calibration features versus external reference precision based on system accuracy requirements and thermal environment.

Part Context

The AD7856ANZ belongs to the AD7856 family of high-speed, low-power sampling ADCs. This series is designed for applications demanding moderate speed and multi-channel capability within a compact footprint. The 'AN' suffix denotes the 24-lead plastic dual in-line package variant, distinguishing it from SOIC or SSOP options within the same functional family.

Replacement Considerations

Direct pin-compatible replacements within the same family include AD7856AR and AD7856ARS. Verify that alternative packages maintain identical electrical characteristics and interface timing requirements for seamless integration into existing designs.