AD7873ARU-REEL

Overview

The AD7873ARU-REEL is a 12-bit successive approximation analog-to-digital converter (ADC) designed for 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 for driving resistive touch screens, an internal 2.5 V reference, and a temperature sensor. It features a synchronous serial interface and programmable resolution of 8 or 12 bits. The component is housed in a 16-lead TSSOP package and functions within an operating temperature range of −40°C to +85°C.

Feature Summary

• 12-bit SAR ADC 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)
• Single supply operation: 2.2 V to 5.25 V
• Shutdown mode with maximum current consumption of 1 µA

Applications

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

Procurement Notes

Verify the specific suffix 'ARU' corresponds to the 16-lead TSSOP package and commercial temperature grade (-40°C to +85°C). Confirm that the '-REEL' designation indicates tape-and-reel packaging rather than tube packaging. Cross-reference the manufacturer part number with official Analog Devices documentation to ensure compatibility with system requirements.

Selection Notes

Select this component when a compact solution for resistive touch screens is required. The integrated switches eliminate external driver components. Ensure the application voltage falls within the 2.2 V to 5.25 V range. Consider the 125 kSPS speed limit if higher sampling rates are necessary. Verify that the TSSOP-16 footprint matches the PCB layout constraints.

Part Context

The AD7873 belongs to the AD7873 family of touch screen controllers. Variants include the AD7873BRQZ (QSOP package) and AD7873ARUZ (TSSOP package). The ARU suffix specifically denotes the TSSOP-16 package configuration. Other family members may offer different package styles or extended temperature ranges, but share the core ADC functionality.

Replacement Considerations

Publicly confirmed substitute part numbers are not available in the provided source material. Users should consult Analog Devices for current alternative recommendations based on specific pinout and performance requirements.