AD7891BP-2

ADCs/DACs - Special Purpose Overview

The AD7891BP-2 is an 8-channel, 12-bit 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 features a conversion time of 1.6 µs max and a typical power dissipation of 82 mW in normal mode. It offers selectable parallel or serial interfaces via the MODE pin and provides overvoltage protection on each channel.

ADCs/DACs - Special Purpose Feature Summary

• 8 Single-Ended Analog Input Channels with Overvoltage Protection
• 12-Bit SAR ADC with 1.6 µs Max Conversion Time
• On-Chip Track/Hold Amplifier and 2.5 V Reference
• Selectable Parallel or Serial Interface (MODE Pin)
• Single 5 V Supply Operation with 82 mW Typical Power Dissipation

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 'BP-2' against the manufacturer's current ordering guide to confirm package type (PLCC) and accuracy grade (±0.75 LSB relative accuracy). Confirm availability status as distribution channels may list this component as obsolete or limited stock. Ensure ESD precautions are observed during handling due to the sensitivity of the CMOS/TTL interface circuitry.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891BP-2 for applications requiring 8-channel multiplexed sampling at up to 500 kSPS per channel. Choose this model over the AD7891-1 variant when unipolar or bipolar input ranges within ±2.5 V or 0–5 V are required rather than ±5 V or ±10 V. The B version offers improved relative accuracy (±0.75 LSB) compared to the A version (±1 LSB). Ensure the interface mode matches the host processor capabilities, as the MODE pin determines parallel or serial operation.

ADCs/DACs - Special Purpose Part Context

The AD7891 belongs to a family of high-speed data acquisition systems from Analog Devices. The AD7891BP-2 specifically denotes the B-grade accuracy version packaged in a 44-lead Plastic Leaded Chip Carrier (PLCC). It shares functional similarities with the AD7891AP-2 but differs in linearity specifications. The part is designed for monolithic integration, reducing board space compared to discrete solutions.

ADCs/DACs - Special Purpose Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided documentation. Designers should verify pin compatibility and electrical parameters if considering alternative manufacturers' 8-channel 12-bit SAR ADCs.