AD7853ARZ

Overview

The AD7853ARZ 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 supports a maximum throughput rate of 200 kSPS. The device features a pseudo-differential input architecture with an acquisition time of 400 ns. Power consumption is typically 20 mW at 3.6 V and 33 mW at 5.5 V in normal mode, with automatic power-down reducing dissipation to 25 mW after conversion. It includes internal self-calibration and system calibration capabilities, along with flexible serial interface modes compatible with SPI, QSPI, and microprocessor systems.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure accuracy over temperature variations.
• Flexible serial interface supporting multiple clocking modes for compatibility with various host controllers.
• Automatic power-down functionality activates immediately following the completion of each conversion cycle.
• Pseudo-differential analog input structure allows for versatile signal range configurations.

Applications

• Battery-powered portable instrumentation
• Medical diagnostic instruments
• Industrial process control systems

Procurement Notes

Verify the specific grade suffix (e.g., ARZ) against the required operating temperature range and linearity specifications. Confirm package availability as the component may be subject to discontinuation notices. Ensure that the ordering documentation matches the exact pinout and calibration requirements for the target application design.

Selection Notes

Select this component when a 12-bit resolution and high-speed sampling are required within a low-power constraint. Compare the AD7853L variant if lower power consumption is prioritized over maximum throughput speed. Evaluate the need for external reference voltage versus utilizing the internal reference output based on system noise sensitivity.

Part Context

This part belongs to the AD7853 family of single-supply sampling ADCs. The 'A' designation indicates a commercial/industrial temperature range specification, while 'R' denotes the SOIC-24 package. The 'Z' suffix signifies lead-free compliance. It serves as a high-performance alternative to parallel interface ADCs in space-constrained designs.

Replacement Considerations

The AD7853L series offers equivalent functionality with optimized low-power characteristics. Verify pin compatibility and software register mapping before substituting with other SAR ADC families.