AD7853LARSZ

Overview

The AD7853LARSZ is a 12-bit, single-channel successive approximation register (SAR) analog-to-digital converter manufactured by Analog Devices Inc. It operates from a single 3 V to 5.5 V supply and supports a maximum throughput rate of 100 kSPS. The device features a pseudo-differential input architecture with an acquisition time of 1 µs. Power consumption is optimized for low-power applications, drawing typically 4.5 mW at 3 V in normal mode and reducing to 1.15 mW in power-down mode. It includes internal self-calibration and system calibration capabilities that activate automatically upon power-up to maintain accuracy over temperature variations.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy without external intervention.
• Flexible serial interface compatible with standard protocols including SPI, QSPI, Microwire, and microprocessor modes.
• Automatic power-down functionality reduces energy consumption immediately following each conversion cycle.
• Pseudo-differential input configuration allows for versatile signal conditioning and biasing options.

Applications

• Battery-powered portable systems such as personal digital assistants and mobile communications devices
• Medical instrumentation requiring precise low-power data acquisition
• Pen computers and handheld control systems

Procurement Notes

Verify the specific grade and package variant when ordering, as performance specifications vary between A and B grades. Confirm the presence of the 'L' suffix indicates the low-power version with a 100 kSPS limit. Ensure the SSOP-24 package matches the target PCB footprint requirements. Check for end-of-life status or alternative recommendations if current stock is unavailable.

Selection Notes

Select the AD7853LARSZ when system design prioritizes minimal power consumption over maximum sampling speed. This component is suitable for applications where 100 kSPS is sufficient and single-supply operation between 3 V and 5 V is required. Consider the AD7853 variant if higher throughput up to 200 kSPS is necessary, accepting the associated increase in power dissipation.

Part Context

This component belongs to the AD7853 family of high-speed, low-power 12-bit ADCs. The 'L' designation specifically identifies the low-power optimized version within this series. The ARSZ suffix denotes the RoHS-compliant SSOP-24 package variant. The family shares common architectural features but differs in speed and power characteristics based on the specific model selected.

Replacement Considerations

Direct functional replacements include the AD7853ARZ for higher speed requirements or other AD7853 variants within the same package. Verify pin compatibility and software register configurations when substituting with different grades or packages from the same manufacturer.