AD7891BP-1REEL

ADCs/DACs - Special Purpose Overview

The AD7891BP-1REEL is an LC2MOS-based, 8-channel, 12-bit high-speed data acquisition system manufactured by Analog Devices. It integrates an input multiplexer, on-chip track/hold amplifier, SAR ADC, and a 2.5 V reference. The device operates from a single 5 V supply and supports ±5 V or ±10 V analog input ranges. It features a selectable parallel or serial interface determined by the MODE pin. Key electrical parameters include a maximum conversion time of 1.6 µs, typical power dissipation of 82 mW in normal mode, and 75 mW in standby. Relative accuracy is specified at ±0.75 LSB max.

ADCs/DACs - Special Purpose Feature Summary

• Monolithic 12-bit SAR ADC with 8 single-ended analog input channels and overvoltage protection.
• Selectable parallel (5-wire) or serial (SPI-compatible) digital interface via MODE pin.
• On-chip 2.5 V voltage reference and track/hold amplifier for simplified system design.
• Low power consumption: 82 mW typical in normal mode; 75 mW typical in standby mode.

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 'REEL' indicates tape-and-reel packaging rather than tube packaging when sourcing replacements. Confirm that the 'B' version designation corresponds to the ±0.75 LSB relative accuracy specification required for the application. Ensure the ordering part number matches the PLCC-44 package type if physical footprint compatibility is critical.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891BP-1REEL for applications requiring bipolar input ranges of ±5 V or ±10 V with higher DC accuracy (±0.75 LSB). Choose this model over the 'A' version if tighter full-scale error matching is needed. Verify interface requirements; while both parallel and serial modes are supported, timing characteristics differ significantly between the two configurations.

ADCs/DACs - Special Purpose Part Context

This component belongs to the AD7891 family of 8-channel, 12-bit data acquisition systems. The 'P' suffix denotes the Plastic Leaded Chip Carrier (PLCC) 44-lead package. The 'B' version offers improved relative accuracy compared to the standard 'A' version. The 'REEL' suffix specifies the shipping format as tape and reel, suitable for automated surface-mount assembly processes.

ADCs/DACs - Special Purpose Replacement Considerations

Direct substitutes within the same package and accuracy class include AD7891AP-1REEL (if ±1 LSB accuracy is acceptable) or AD7891YSZ-1REEL (for extended temperature range -55°C to +105°C). Note that MQFP packages (S suffix) are pin-compatible but have different thermal and mechanical characteristics.