AD7858LARS-REEL

Overview

The AD7858LARS-REEL is a low-power, 12-bit successive approximation analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and features eight single-ended or four pseudo-differential analog input channels. The device supports a maximum sampling rate of 100 kSPS with a typical power dissipation of 6.85 mW at 3 V. It includes an internal 2.5 V reference, system calibration capabilities, and a flexible serial interface compatible with SPI and QSPI protocols. The component is housed in a 24-lead SSOP package.

Feature Summary

• Integrated self-calibration and system calibration functions ensure accurate operation over time and temperature variations.
• Flexible serial interface supports multiple communication protocols including SPI, QSPI, and 8051 compatibility.
• Automatic power-down mode reduces power consumption significantly after each conversion cycle.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Medical instruments requiring precise signal acquisition
• Pen computers and portable instrumentation systems

Procurement Notes

Verify the specific ordering suffix against official manufacturer documentation to confirm package type and reel specifications. Ensure that the procurement source provides valid traceability for the component lot. Confirm environmental compliance status directly with the supplier's current certification documents prior to purchase.

Selection Notes

Select this model when a low-power 12-bit resolution is required with a throughput rate up to 100 kSPS. It is suitable for applications where single-supply operation between 3 V and 5.5 V is necessary. Consider the SSOP package constraints for board space and thermal management requirements compared to DIP or SOIC alternatives.

Part Context

This component belongs to the AD7858 family of high-speed, low-power ADCs. The 'L' designation indicates the low-power variant optimized for reduced energy consumption compared to the standard AD7858. The 'AR' suffix specifies the SOIC package, while 'Z' denotes lead-free construction. The '-REEL' suffix indicates tape and reel packaging for automated assembly.

Replacement Considerations

The AD7858LARZ is a direct pin-compatible alternative within the same family offering similar electrical characteristics. Verify that the replacement part matches the required package dimensions and thermal performance specifications for the existing design.