AD7873ARUZ-REEL7

Overview

The AD7873ARUZ-REEL7 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 low on-resistance switches, an on-chip 2.5 V reference, and a temperature sensor. Key features include direct battery measurement (0 V to 6 V), touch pressure sensing, and a programmable serial interface. It is housed in a 16-lead TSSOP package with a specified operating temperature range of −40°C to +85°C.

Feature Summary

• 12-bit resolution with 125 kSPS throughput rate
• Integrated 2.5 V reference and on-chip temperature sensor
• Direct battery monitor input supporting 0 V to 6 V range
• Low power 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 REEL7 suffix indicates tape-and-reel packaging when sourcing this component. Confirm that the specific revision matches the required thermal and electrical specifications for the target application environment.

Selection Notes

Select this model for systems requiring integrated touch screen driving switches and battery monitoring within a compact footprint. Ensure the external clock frequency does not exceed 2 MHz to maintain specified timing parameters and data integrity.

Part Context

This component belongs to the AD7873 family of touch screen controllers. It shares functional similarities with the AD7843 but adds internal reference and temperature sensing capabilities. The ARUZ suffix specifically denotes the 16-lead TSSOP package variant.

Replacement Considerations

The AD7873BRQZ serves as a pin-compatible alternative in a QSOP package. Verify package dimensions and thermal characteristics when substituting between TSSOP and QSOP form factors.