AD7853LARZ

Overview

The AD7853LARZ is a 12-bit 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 features a throughput rate of 100 kSPS. The device utilizes a pseudo-differential input scheme with an acquisition time of 1 ns minimum. It supports flexible serial interfaces including SPI, QSPI, Microwire, and 8051 compatibility via SM1/SM2 pins. Power consumption is typically 6.85 mW at 3 V in normal mode, dropping to 400 nA in partial power-down. It includes internal self-calibration and system calibration capabilities.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure accuracy over temperature variations.
• Flexible serial interface supporting multiple communication protocols for diverse microcontroller integration.
• Automatic power-down functionality reduces energy consumption during idle periods.
• Pseudo-differential input architecture minimizes common-mode noise interference.

Applications

• Battery-powered personal digital assistants and mobile communications devices
• Medical instrumentation requiring low power and high precision
• Pen computers and portable data acquisition systems

Procurement Notes

Verify the specific grade and package variant when ordering, as the suffix indicates SSOP packaging. Confirm that the L-series designation corresponds to the optimized low-power specifications required for the application. Ensure the voltage supply range aligns with the 3 V to 5.5 V operational limits defined in the datasheet.

Selection Notes

Select this component for applications prioritizing low power consumption over maximum speed, as the L-version offers reduced current draw compared to the standard AD7853. Consider the 100 kSPS throughput limit when designing signal processing chains. Verify that the serial interface modes supported by the host processor match the available SM1/SM2 configurations.

Part Context

This part belongs to the AD7853 family of 12-bit sampling ADCs. The AD7853L variant is specifically optimized for lower power dissipation compared to the standard AD7853, which targets higher speed performance. Both share similar architectural features but differ in clock frequency limits and power profiles.

Replacement Considerations

The AD7853BRZ is a parameter-equivalent alternative within the same family offering different linearity grades. Other members like the AD7858 provide multiplexed inputs but may require interface adjustments.