AD7877ACBZ-REEL7

Overview

The AD7877ACBZ-REEL7 is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitization. It operates on a single 2.7 V to 5.25 V supply and achieves a throughput rate of 125 kSPS. The device integrates an internal 2.5 V reference, an 8-bit DAC, and an on-chip temperature sensor. It features four-wire touch screen interface switches, two battery measurement channels, three auxiliary inputs, and four GPIOs. Communication occurs via a synchronous serial interface with a separate VDRIVE logic level.

Feature Summary

• 12-bit resolution with 125 kSPS throughput rate
• Integrated 2.5 V reference, 8-bit DAC, and temperature sensor
• Four-wire resistive touch screen interface with low on-resistance switches
• Two dedicated battery monitor inputs and three auxiliary analog inputs

Applications

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

Procurement Notes

Verify the package type matches the specific suffix; the ACBZ variant indicates the 32-lead LFCSP form factor. Confirm that the REEL7 designation corresponds to the standard tape-and-reel packaging configuration required for automated assembly processes.

Selection Notes

Select this component when a complete touch screen controller solution is required within a limited footprint. The integrated switches and sequencer reduce external component count compared to discrete ADC solutions. Ensure the host system supports the required SPI-compatible serial interface timing specifications.

Part Context

This part belongs to the AD7877 family of touch screen controllers manufactured by Analog Devices Inc. The REEL7 suffix identifies the specific reel packaging format used for high-volume surface mount production lines.

Replacement Considerations

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