AD7891ASZ-2REEL

ADCs/DACs - Special Purpose Overview

The AD7891ASZ-2REEL is an LC2MOS-based, 8-channel, 12-bit high-speed data acquisition system manufactured by Analog Devices. It integrates a multiplexer, track/hold amplifier, ADC, and 2.5 V reference on a single chip. Operating from a single 5 V supply, it supports input ranges of 0 to +2.5 V, 0 to +5 V, and ±2.5 V. The device offers selectable parallel or serial interfaces via the MODE pin. Key electrical parameters include a maximum conversion time of 1.6 µs, typical power dissipation of 82 mW in normal mode, and relative accuracy of ±1 LSB. It is housed in a 44-terminal MQFP package.

ADCs/DACs - Special Purpose Feature Summary

• Integrated 8-channel multiplexer with overvoltage protection on each channel
• On-chip 2.5 V voltage reference and track/hold amplifier
• Configurable parallel or serial interface structure controlled by the MODE pin
• Single 5 V supply operation with low power consumption (82 mW typical)

ADCs/DACs - Special Purpose Applications

• Data Acquisition Systems
• Motor Control
• Mobile Communication Base Stations
• Instrumentation

ADCs/DACs - Special Purpose Procurement Notes

Verify the specific suffix 'REEL' indicates tape-and-reel packaging rather than tube. Confirm the 'Z' suffix denotes lead-free compliance status as per manufacturer specifications. Ensure the 'AS' designation matches the required commercial temperature range (-40°C to +85°C) for the application environment.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891ASZ-2REEL for applications requiring unipolar or bipolar input ranges up to ±2.5 V. Choose this model over the -1 variant if the system requires 0 to +5 V or 0 to +2.5 V inputs. Verify interface requirements; while both modes are supported, parallel mode achieves higher throughput rates compared to serial mode limitations.

ADCs/DACs - Special Purpose Part Context

This component belongs to the AD7891 family of monolithic data acquisition systems. The ASZ-2 variant specifically designates the Plastic Quad Flatpack (MQFP) package with lead-free construction and the -2 input range configuration. It serves as a complete solution for multi-channel signal conditioning and digitization in embedded systems.

ADCs/DACs - Special Purpose Replacement Considerations

Direct substitutes within the same family include AD7891AS-2REEL (non-Z version) or AD7891BSZ-2REEL (higher accuracy). Cross-family replacements require verification of pin compatibility and input range specifications.