AD7858LARSZ

Overview

The AD7858LARSZ is an 8-channel, 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 a throughput rate of 100 kSPS. The device includes an internal 2.5 V reference, system calibration capabilities, and flexible serial interface compatibility with SPI/QSPI/8051 protocols. It is housed in a 24-lead SSOP package.

Feature Summary

• Low power consumption optimized for battery-powered applications
• Integrated self-calibration and system calibration functions
• Flexible serial interface compatible with multiple microprocessor standards
• Automatic power-down mode after conversion

Applications

• Battery-powered systems such as personal digital assistants and medical instruments
• Pen computers
• Instrumentation and control systems
• High-speed modems

Procurement Notes

Verify the specific suffix ARSZ corresponds to the 24-lead SSOP package variant when sourcing. Confirm that the L designation indicates the low-power 100 kSPS version rather than the standard 200 kSPS model. Ensure environmental compliance documentation matches project requirements.

Selection Notes

Select this component for applications requiring low power dissipation at approximately 4.5 mW under normal operation. Choose the AD7858L variant over the standard AD7858 if the maximum sampling rate requirement does not exceed 100 kSPS. Verify that the 12-bit resolution and 8-channel multiplexing meet the signal acquisition needs.

Part Context

This part belongs to the AD7858 family of high-speed, low-power ADCs. The AD7858L variant is specifically engineered for lower power consumption compared to the standard AD7858, which targets higher speed performance. Both share the same pinout and functional architecture.

Replacement Considerations

The AD7858LARZ serves as a tube-packaged alternative to the reel version. Standard AD7858 variants offer higher speed but increased power consumption.