AD7859LASZ-REEL

Overview

The AD7859LASZ-REEL is a low-power, 8-channel, 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 delivers a throughput rate of 100 kSPS. The device features an internal track-and-hold amplifier with a 500 ns acquisition time and supports both unipolar and bipolar input ranges. It includes self-calibration and system calibration capabilities to maintain accuracy over temperature and time variations. The component utilizes a flexible parallel interface for data transfer and is housed in a 44-pin plastic quad flatpack (PQFP) package.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy without external adjustments.
• Flexible power management options allow operation in normal mode or automatic power-down states to minimize energy consumption.
• Supports pseudo-differential and single-ended input configurations via programmable control registers.
• Capable of converting full-power signals up to the specified throughput rate using CMOS construction.

Applications

• Battery-powered systems such as personal digital assistants and mobile communications devices
• Medical instruments requiring precise signal acquisition
• Instrumentation and control systems
• High-speed modems

Procurement Notes

Verify the specific suffix REEL indicates tape and reel packaging when sourcing components. Confirm that the LASZ designation corresponds to the low-power L variant within the PQFP package. Ensure compatibility with existing board layouts designed for 44-pin PQFP footprints. Check for moisture sensitivity level requirements during storage and handling procedures prior to assembly.

Selection Notes

Select this model when low power consumption is prioritized over maximum sampling speed compared to the standard AD7859 variant. Ensure the application requires an 8-channel multiplexed input structure with a 12-bit resolution. Verify that the system can accommodate a parallel interface rather than serial alternatives. Confirm that the 100 kSPS throughput rate meets the signal bandwidth requirements of the target application.

Part Context

This component belongs to the AD7859 family of high-speed, low-power ADCs from Analog Devices. The family includes variants optimized for different performance trade-offs, such as the standard AD7859 which offers higher speed at increased power dissipation. The AD7859L series specifically targets applications where energy efficiency is critical while maintaining adequate conversion accuracy for general-purpose data acquisition tasks.

Replacement Considerations

The AD7859ASZ serves as a higher-speed alternative within the same package family but consumes more power. The AD7859BSZ offers improved linearity specifications compared to the standard A version. Designers should verify pin compatibility and register mapping when substituting between these variants to ensure functional equivalence in the host system.