AD7859LASZ

Overview

The AD7859LASZ is a low-power, 12-bit, 8-channel analog-to-digital converter (ADC) from the AD7859 family. It operates on 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 pseudo-differential or single-ended input configurations. It includes self-calibration and system calibration options to maintain accuracy over temperature and time variations. Power consumption is optimized for battery-powered applications, offering multiple power-down modes.

Feature Summary

• Integrated self-calibration and system calibration mechanisms ensure long-term accuracy without external adjustments.
• Flexible parallel interface supporting both 16-bit word and 8-bit byte data transfer modes.
• Multiple power management states including automatic power-down after conversion for energy efficiency.
• Pseudo-differential sampling scheme reduces common-mode noise in analog signal paths.

Applications

• Battery-powered medical instruments
• Portable pen computers and personal digital assistants
• Industrial instrumentation and control systems

Procurement Notes

Verify the specific suffix 'L' indicates the low-power variant with 100 kSPS throughput rather than the standard 200 kSPS version. Confirm the package type matches the required PCB footprint, as this model typically utilizes a 44-pin SSOP or PQFP configuration. Check RoHS compliance status and moisture sensitivity levels before integration into manufacturing processes.

Selection Notes

Select this component when low power consumption is critical alongside moderate speed requirements. The AD7859LASZ is suitable for designs requiring 8 channels but not needing the higher 200 kSPS speed of the standard AD7859. Ensure the application can accommodate the parallel interface complexity compared to serial alternatives like the AD7851.

Part Context

This part belongs to the AD7859 series of high-speed, low-power ADCs manufactured by Analog Devices. It is specifically the low-power optimized variant, distinguished from the standard AD7859 by its reduced throughput and lower active current draw. The series is designed for applications balancing performance with battery life constraints.

Replacement Considerations

The AD7859BSZ serves as a higher-speed alternative within the same family. For serial interface replacements, consider the AD7851ARSZ-REEL, though it offers only one channel. Verify pin compatibility and software register mapping differences when substituting.