AD7891AP-1

ADCs/DACs - Special Purpose Overview

The AD7891AP-1 is an LC2MOS 8-channel, 12-bit high-speed data acquisition system manufactured by Analog Devices. It integrates an input multiplexer, a track/hold amplifier, a 12-bit SAR ADC, and a 2.5 V reference on a single chip. Operating from a single +5 V supply, it supports ±5 V and ±10 V analog input ranges with overvoltage protection up to ±17 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, a typical power dissipation of 82 mW in normal mode, and a standby power consumption of 75 μW. It is housed in a 44-lead PLCC package.

ADCs/DACs - Special Purpose Feature Summary

• 8 Single-Ended Analog Input Channels with Overvoltage Protection
• Fast 12-Bit SAR ADC with 1.6 μs Conversion Time
• Selectable Parallel or Serial Interface Structure
• On-Chip Track/Hold Amplifier and 2.5 V Reference

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 Plastic Leaded Chip Carrier (PLCC) package option. Confirm that the '-1' designation corresponds to the ±5 V and ±10 V input range model. Check for RoHS compliance status as original datasheets may list non-compliant variants. Ensure ESD precautions are observed during handling due to sensitivity.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891AP-1 when bipolar input signals within ±5 V or ±10 V ranges are required. Choose this part over the AD7891-2 variant if unipolar inputs (0 V to +2.5 V, etc.) are not needed. Consider the interface requirement; while both modes are supported, parallel mode allows higher throughput rates up to 454.5 kSPS compared to the serial limit of 357 kSPS. Verify temperature range requirements against the commercial grade (-40°C to +85°C).

ADCs/DACs - Special Purpose Part Context

The AD7891 series comprises monolithic data acquisition systems available in multiple accuracy grades (A, B, Y) and packages (MQFP, PLCC). The AP-1 variant specifically denotes the A-grade accuracy with PLCC packaging. It belongs to the LC2MOS family, designed for low-power, high-speed applications. Other variants include the AS-1 (MQFP package) and BP-1 (higher accuracy), sharing the same core functionality but differing in precision and form factor.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not provided in the source material.