AD7896BR

Overview

The AD7896BR is a 12-bit successive approximation register (SAR) analog-to-digital converter (ADC) housed in an 8-lead SOIC package. It operates from a single 2.7 V to 5.5 V supply, consuming 9 mW typical power. The device features an on-chip track-and-hold amplifier and generates its own clock internally. It supports a maximum throughput rate of 100 kHz with an 8 µs conversion time in high-speed mode. The analog input range spans from 0 V to VDD, utilizing the supply voltage as the internal reference. Data is accessed via a high-speed serial interface requiring SCLK and SDATA lines.

Feature Summary

• Integrated track-and-hold amplifier ensures accurate signal acquisition for full-scale sine waves up to the Nyquist rate.
• Proprietary automatic power-down mode reduces consumption significantly during low-rate conversions by entering sleep after completion.
• High-speed serial interface allows easy connection to microcontrollers using standard two-wire communication protocols.

Applications

• Battery-powered portable instrumentation systems
• Industrial process control data acquisition
• Portable medical devices requiring low power consumption

Procurement Notes

Verify the specific suffix 'BR' against official Analog Devices documentation to confirm exact temperature grade and packaging details, as datasheets primarily list A, B, J, and S versions. Ensure compatibility with 3.3 V or 5 V logic levels when integrating into existing system architectures.

Selection Notes

Select this component for applications requiring a compact 8-lead solution with integrated reference and clock generation. Consider the 100 kHz throughput limit and 12-bit resolution when designing for speed and accuracy requirements. Evaluate power constraints if operating in continuous conversion modes versus auto-sleep modes.

Part Context

The AD7896 series includes variants such as AD7896ANZ, AD7896ARZ, and AD7896JR. These parts share identical functional specifications but differ in temperature ranges and package types. The BR designation typically indicates a specific industrial temperature grade variant within the broader AD7896 family offered by Analog Devices.

Replacement Considerations

Direct replacements include other AD7896 variants like AD7896ARZ or AD7896ANZ depending on required temperature range. Cross-reference with newer SAR ADCs from Analog Devices if higher speeds or additional channels are needed.