AD7891ASZ-2

ADCs/DACs - Special Purpose Overview

The AD7891ASZ-2 is an 8-channel, 12-bit high-speed data acquisition system manufactured by Analog Devices. It integrates a multiplexer, track/hold amplifier, SAR 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 a sample rate of 500 kSPS for single-channel sampling and features both parallel and serial interfaces selectable via the MODE pin. It is housed in a 44-terminal MQFP package with an operating temperature range of -40°C to +85°C.

ADCs/DACs - Special Purpose Feature Summary

• 8 Single-Ended Analog Input Channels with overvoltage protection
• 12-Bit SAR ADC with 500 kSPS sample rate (single channel)
• On-Chip 2.5 V Reference and Track/Hold Amplifier
• Selectable Parallel or Serial Interface via MODE pin

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 'Z' indicates Pb-free compliance as per the ordering guide. Confirm the '-2' variant matches the required unipolar/bipolar input voltage ranges (0 to +2.5 V, 0 to +5 V, ±2.5 V). Ensure the 44-MQFP package form factor fits the target PCB layout constraints.

ADCs/DACs - Special Purpose Selection Notes

Select this model for applications requiring 8 channels with 12-bit resolution at up to 500 kSPS. Choose the parallel interface if higher throughput is needed compared to the serial mode limit of 357 kSPS. Ensure the analog input signals fall within the supported ranges of the AD7891-2 variant. Consider the 100 mW maximum power dissipation for thermal management.

ADCs/DACs - Special Purpose Part Context

The AD7891ASZ-2 belongs to the AD7891 family of LC2MOS data acquisition systems. The 'A' denotes the commercial temperature grade (-40°C to +85°C), 'S' indicates the MQFP package, and 'Z' signifies lead-free construction. It is distinct from the AD7891-1 which supports ±5 V and ±10 V ranges.

ADCs/DACs - Special Purpose Replacement Considerations

Direct substitutes include other variants within the AD7891 family such as AD7891AS-2 or AD7891BS-2, depending on accuracy and packaging requirements. Verify compatibility of input ranges and interface modes when substituting.