AD7856ARSZ

Overview

The AD7856ARSZ is a high-speed, low-power 14-bit analog-to-digital converter (ADC) from Analog Devices. It operates from a single 5 V supply and supports an 8-channel input configuration, functioning as either eight single-ended or four pseudo-differential inputs. The device achieves a throughput rate of 285 kSPS with a typical power dissipation of 60 mW in normal operation. It features self-calibration and system calibration options to maintain accuracy over time and temperature variations. The ADC utilizes a flexible serial interface compatible with SPI, QSPI, and microprocessor standards, housed in a 24-lead SOIC package.

Feature Summary

• Supports eight single-ended or four pseudo-differential analog input channels.
• Includes self-calibration and system calibration capabilities for sustained accuracy.
• Features automatic power-down after conversion to minimize energy consumption.
• Provides a versatile serial I/O port compatible with standard communication protocols.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices.
• Medical instruments requiring precise signal acquisition.
• Instrumentation and control systems.
• High-speed modems.

Procurement Notes

Verify the specific grade version required for your application, as the AD7856 series includes different temperature grades. Confirm that the 24-lead SOIC package aligns with your PCB footprint requirements. Ensure that the single 5 V supply voltage matches your system design constraints before finalizing procurement.

Selection Notes

Select this component when a 14-bit resolution and 285 kSPS sampling rate are necessary for multi-channel data acquisition. Consider the internal reference and calibration features if external precision references are unavailable. Evaluate the power-down modes against your system's battery life requirements to optimize energy efficiency during idle periods.

Part Context

The AD7856 belongs to a family of high-speed, low-power ADCs designed for portable and desktop applications. It shares architectural similarities with other members like the AD7853 and AD7858 but offers distinct channel counts and resolution combinations. This specific model focuses on providing eight channels with 14-bit precision in a compact form factor suitable for space-constrained designs.

Replacement Considerations

Direct replacements within the same family include the AD7856AN and AD7856AR, which share identical electrical specifications but differ in packaging types. Verify pin compatibility and thermal characteristics when substituting between DIP, SOIC, and SSOP variants.