AD7891BP-1

ADCs/DACs - Special Purpose Overview

The AD7891BP-1 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 ±5 V or ±10 V input ranges with a maximum sample rate of 454.5 kSPS. The device features a conversion time of 1.6 µs and offers selectable parallel or serial interfaces via the MODE pin. Typical power dissipation is 82 mW in normal mode and 75 mW in standby. It is housed in a 44-lead PLCC package.

ADCs/DACs - Special Purpose Feature Summary

• 8 Single-Ended Analog Input Channels
• 12-Bit Resolution with ±0.75 LSB Relative Accuracy
• Parallel and Serial Interface Options
• 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 as defined in the ordering guide. Confirm that the '-1' designation corresponds to the bipolar input range specifications (±5 V or ±10 V). Ensure compatibility with the required operating temperature range of –40°C to +85°C for this version.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891BP-1 when bipolar input signals within ±5 V or ±10 V ranges are required. The 'B' version provides improved relative accuracy of ±0.75 LSB compared to the 'A' version's ±1 LSB. Choose the PLCC package if surface mount chip carrier form factors are preferred over MQFP. Verify interface requirements, as the MODE pin determines between parallel and serial communication protocols.

ADCs/DACs - Special Purpose Part Context

The AD7891BP-1 belongs to the AD7891 family of monolithic data acquisition systems. It shares core architecture with the AD7891AP-1 and AD7891AS-1 but differs in accuracy grade and packaging. The 'B' suffix denotes the higher accuracy variant, while 'P' specifies the PLCC package. This part is distinct from the AD7891-2 series, which supports unipolar input ranges.

ADCs/DACs - Special Purpose Replacement Considerations

Public confirmed substitute part numbers: AD7891AP-1, AD7891BS-1, AD7891YS-1.