AD7853ARZ-REEL

Overview

The AD7853ARZ-REEL is a 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 supports a throughput rate of 200 kSPS. The device features a pseudo-differential input range of 0 to VREF, with output coding available in straight binary or two's complement formats. Normal mode power dissipation is typically 12 mW at 3 V. It includes system and self-calibration capabilities with autocalibration on power-up. The component utilizes a flexible serial interface compatible with SPI, QSPI, and µP standards, housed in a 24-lead SSOP package.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure operational accuracy across varying temperatures and timeframes.
• Flexible serial communication interface supporting multiple standard protocols including SPI, QSPI, and microprocessor modes.
• Automatic power-down functionality activates immediately following conversion cycles to minimize energy consumption.
• Track-and-hold amplifier acquires input signals within 500 ns using a pseudo-differential sampling scheme.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Medical instruments requiring precise signal acquisition
• Pen computers and high-speed modem applications

Procurement Notes

Verify the specific grade and temperature rating required for your application, as specifications vary between A and B versions. Confirm that the SSOP-24 package dimensions align with your PCB footprint constraints. Ensure the external reference voltage connected to REFIN/REFOUT falls within the functional range of 1.2 V to VDD. Check for any lead-free compliance requirements if operating in restricted jurisdictions.

Selection Notes

Select the AD7853 variant over the AD7853L when maximum throughput speed is prioritized over minimal power consumption. Consider the AD7853L if the design requires lower active current draw at the expense of reduced sample rates. Evaluate the need for bipolar versus unipolar input ranges based on the AMODE pin configuration. Verify that the master clock frequency requirements match the specific grade limitations defined in the datasheet.

Part Context

This component belongs to the AD7853 family of high-speed, low-power ADCs designed for single-supply operation. The family includes variants optimized for different performance trade-offs, such as the AD7853L which focuses on reduced power dissipation. These devices are commonly used in portable electronics and instrumentation where accurate data conversion is critical.

Replacement Considerations

Public confirmed substitute part numbers: AD7853AN, AD7853BN, AD7853LAR, AD7853LBR.