AD7891AP-2

ADCs/DACs - Special Purpose Overview

The AD7891AP-2 is an 8-channel, 12-bit data acquisition system manufactured by Analog Devices Inc. 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 offers parallel or serial interface options via the MODE pin. Key electrical parameters include a maximum conversion time of 1.6 µs, allowing a sample rate of 500 kSPS for single-channel operation. Power dissipation is typically 82 mW in normal mode.

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 Selection via MODE Pin
• Single-Supply 5 V Operation 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 component authenticity through authorized distributors or direct manufacturer channels. Confirm package integrity upon receipt, as the PLCC-44 variant is sensitive to mechanical stress during handling. Ensure proper ESD precautions are observed during storage and installation to prevent damage to internal circuitry.

ADCs/DACs - Special Purpose Selection Notes

Select the AD7891AP-2 when bipolar input ranges such as ±2.5 V are required alongside unipolar options like 0 to +5 V. This model provides a higher sample rate of 500 kSPS compared to the AD7891-1 series. Choose the PLCC-44 package for surface-mount applications requiring specific footprint constraints compatible with this leaded chip carrier format.

ADCs/DACs - Special Purpose Part Context

The AD7891 family consists of monolithic 12-bit data acquisition systems available in multiple accuracy grades and temperature ranges. The AP suffix denotes the Plastic Leaded Chip Carrier (PLCC) package option. The -2 designation specifically indicates support for unipolar and limited bipolar input voltage ranges, distinguishing it from the -1 version designed for wider ±5 V and ±10 V inputs.

ADCs/DACs - Special Purpose Replacement Considerations

AD7891BP-2: Offers improved relative accuracy of ±0.75 LSB while maintaining identical input ranges and performance characteristics.