AD7858LBRZ

Overview

The AD7858LBRZ is a low-power, 12-bit successive approximation analog-to-digital converter (ADC) manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and features an internal 2.5 V reference. The device supports eight single-ended or four pseudo-differential input channels with a maximum sampling rate of 100 kSPS. It utilizes a flexible serial interface compatible with SPI, QSPI, and 8051 protocols. Key specifications include a typical power dissipation of 4.5 mW at 3 V, integral nonlinearity of ±1 LSB, and a signal-to-noise ratio of 70 dB. The component is housed in a 24-lead SOIC package.

Feature Summary

• Integrated system and self-calibration capabilities with automatic calibration on power-up to ensure accuracy over time and temperature variations.
• Flexible power management options including automatic power-down after conversion and multiple sleep modes for optimized energy efficiency.
• Versatile serial I/O port supporting standard communication protocols such as SPI, QSPI, and 8051 microprocessor interfaces.

Applications

• Battery-powered systems including personal digital assistants and mobile communications devices
• Medical instruments requiring low power consumption and high precision
• Instrumentation and control systems utilizing multi-channel data acquisition

Procurement Notes

Verify the specific suffix BRZ indicates the SOIC-24 package variant when sourcing replacements. Confirm that the L designation corresponds to the 100 kSPS low-power version rather than the standard 200 kSPS model. Ensure compatibility with existing serial interface timing requirements before integration into new designs.

Selection Notes

Select this component for applications prioritizing low power consumption over maximum throughput speed. The AD7858L offers reduced power dissipation compared to the AD7858 but operates at half the sampling rate. Consider the integrated reference and calibration features if external components are to be minimized in the design.

Part Context

This part belongs to the AD7858 family of 12-bit ADCs from Analog Devices. The AD7858L variant is specifically optimized for low power operation, distinguishing it from the higher-speed AD7858. Both share identical pinouts and functional architectures, differing primarily in performance specifications related to sampling rate and power consumption.

Replacement Considerations

AD7858LARZ is a confirmed substitute part number available from Analog Devices Inc.