AD7873ARQ-REEL7

Overview

The AD7873ARQ-REEL7 is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitization. It operates from a single 2.2 V to 5.25 V supply and achieves a throughput rate of 125 kSPS. The device integrates a 4-wire touch screen interface, an on-chip 2.5 V reference, and a temperature sensor covering −40°C to +85°C. Key features include direct battery measurement (0 V to 6 V), touch pressure sensing, and programmable 8-bit or 12-bit resolution. It utilizes a high-speed synchronous serial interface and offers a shutdown mode with maximum current consumption of 1 µA.

Feature Summary

• 12-bit ADC with 125 kSPS throughput rate
• Integrated 4-wire touch screen interface and switches
• On-chip 2.5 V reference and temperature sensor (−40°C to +85°C)
• Direct battery monitor input (0 V to 6 V) and auxiliary analog input
• Shutdown mode with 1 µA maximum current consumption

Applications

• Personal digital assistants
• Smart hand-held devices
• Touch screen monitors
• Point-of-sale terminals
• Pagers

Procurement Notes

Verify the package type matches the 'AR' suffix designation, which corresponds to the 16-lead QSOP format. Confirm the '-REEL7' suffix indicates tape-and-reel packaging suitable for automated assembly processes. Ensure the operating environment stays within the specified -40°C to +85°C commercial temperature range for guaranteed performance parameters.

Selection Notes

Select this component for battery-powered systems requiring low power consumption and integrated touch screen driving capabilities. The ratiometric conversion mode helps eliminate errors caused by internal switch resistances. Consider the available package options, including QSOP, TSSOP, and LFCSP, based on board space constraints and thermal requirements.

Part Context

This part belongs to the AD7873 series of touch screen digitizers manufactured by Analog Devices Inc. The series provides a complete solution for resistive touch screens by combining ADC functionality with necessary switching logic and references in a compact footprint.

Replacement Considerations

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