AD7873ACPZ-REEL

Overview

The AD7873ACPZ-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 achieves throughput rates exceeding 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 ±1 LSB (AD7873B1 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 input)

Applications

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

Procurement Notes

Verify the specific suffix 'ACPZ' corresponds to the Lead Frame Chip Scale Package (LFCSP) configuration as defined in the manufacturer's ordering guide. Confirm that the reel packaging matches production requirements. Check for end-of-life status or alternative package availability if long-term supply stability is required.

Selection Notes

Select the AD7873B1 variant for specified performance with ±1 LSB maximum integral nonlinearity compared to the A1 variant. Ensure the system clock frequency does not exceed 2 MHz to maintain timing specifications. Verify that the external source impedance allows for sufficient track-and-hold acquisition time at the desired sampling rate.

Part Context

This component belongs to the AD7873 family of touch screen controllers. It shares functional similarities with the AD7843 but offers integrated switching capabilities. The LFCSP package provides a compact 4 mm × 4 mm footprint suitable for space-constrained portable electronics.

Replacement Considerations

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