AD7891APZ-2

ADCs/DACs - Special Purpose Overview

The AD7891APZ-2 is an 8-channel, 12-bit data acquisition system (DAS) from 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 parallel or serial interfaces selectable via the MODE pin. Key electrical parameters include a maximum conversion time of 1.6 µs, a typical power dissipation of 82 mW in normal mode, and a standby power consumption of 75 mW. It features overvoltage protection on all channels.

ADCs/DACs - Special Purpose Feature Summary

• 8 Single-Ended Analog Input Channels with Overvoltage Protection
• On-Chip Track/Hold Amplifier and 2.5 V Reference
• Parallel and Serial Interface Options
• Single-Supply Operation (5 V) with Low Power Consumption

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 'P' indicates the PLCC-44 package and 'Z' denotes Pb-free compliance when sourcing. Confirm the '-2' variant matches the required unipolar/bipolar input voltage ranges (0 to +2.5 V, 0 to +5 V, ±2.5 V). Check current availability status as older revisions may be discontinued.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891APZ-2 for applications requiring 8 channels with 12-bit resolution at up to 500 kSPS per channel. Ensure the interface mode (parallel vs. serial) aligns with the host microprocessor capabilities. Verify that the analog input signal levels fall within the supported ranges for the -2 model. Consider thermal management if operating near the maximum junction temperature limits.

ADCs/DACs - Special Purpose Part Context

The AD7891 series includes variants with different accuracy grades (A, B, Y) and packages (PLCC, MQFP). The APZ-2 specifically refers to the A-grade accuracy version in a Plastic Leaded Chip Carrier (PLCC) package with Pb-free termination. It is part of a broader family including the ASZ-2 (MQFP package) and other speed/accuracy variants like the AD7891-1.

ADCs/DACs - Special Purpose Replacement Considerations

Direct replacements include the AD7891BPZ-2 for improved accuracy (±0.75 LSB) or the AD7891YSZ-2 for extended temperature range (-55°C to +105°C). Package alternatives are the AD7891ASZ-2 (MQFP-44). Verify pin compatibility and software register settings when substituting.