AD7873ARQ-REEL

Overview

The AD7873ARQ-REEL is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitizer applications. It operates from a single 2.2 V to 5.25 V supply and supports throughput rates up to 125 kSPS. The device integrates on-chip switches, a 2.5 V reference, and a temperature sensor. Key specifications include a maximum integral nonlinearity of ±2 LSB (AD7873A1 variant), an input voltage range of 0 V to VREF, and a shutdown mode with current consumption below 1 µA. It utilizes a high-speed synchronous serial interface for data access.

Feature Summary

• 12-bit resolution with 125 kSPS throughput rate
• Integrated 4-wire touch screen interface with low on-resistance switches
• On-chip 2.5 V reference and temperature sensor (-40°C to +85°C)
• Direct battery measurement capability (0 V to 6 V)
• Shutdown mode reduces power consumption to <1 µA

Applications

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

Procurement Notes

Verify the specific grade suffix (e.g., A1 or B1) required for your application's accuracy specifications, as the base part number covers multiple performance variants. Confirm that the REEL packaging format aligns with your automated assembly equipment requirements. Ensure the operating environment stays within the specified -40°C to +85°C commercial temperature range for guaranteed electrical parameters.

Selection Notes

Select the AD7873A1 variant if the application requires a maximum integral nonlinearity of ±2 LSB; choose the AD7873B1 variant for tighter accuracy at ±1 LSB. Consider the internal 2.5 V reference sufficiency versus external reference needs based on system noise immunity requirements. Evaluate the 16-lead QSOP package thermal characteristics against the expected power dissipation in the final enclosure design.

Part Context

This component belongs to the AD7873 family of touch screen controllers manufactured by Analog Devices Inc. The ARQZ designation indicates the 16-lead Quarter Size Outline Package (QSOP). The -REEL suffix specifies the tape-and-reel packaging configuration intended for surface-mount assembly processes, distinguishing it from tube-packaged units.

Replacement Considerations

Public confirmed substitute part numbers are not available in the provided documentation.