AD7877ACPZ-REEL

Overview

The AD7877 is a 12-bit successive approximation analog-to-digital converter (ADC) designed for resistive touch screen digitization. It operates from a single 2.7 V to 5.25 V supply with a maximum throughput rate of 125 kSPS. The device integrates an on-chip 2.5 V reference, an 8-bit DAC, and a temperature sensor. It supports four-wire touch screens via dedicated X/Y inputs and includes two battery measurement channels, three auxiliary analog inputs, and four GPIOs. Shutdown current is limited to 1 µA maximum.

Feature Summary

• 12-bit resolution with 125 kSPS throughput rate
• Integrated 2.5 V reference, 8-bit DAC, and temperature sensor
• Four-wire touch screen interface with LCD noise reduction (STOPACQ)
• Two direct battery measurement channels (0.5 V to 5 V)
• Shutdown mode with 1 µA maximum current consumption

Applications

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

Procurement Notes

Verify the specific package variant required, as the AD7877 family includes both 32-lead LFCSP and 25-ball WLCSP options. Confirm that the REEL suffix corresponds to the tape-and-reel packaging format intended for automated assembly processes.

Selection Notes

Select this component for systems requiring integrated touch digitization and power management features. Ensure the host processor supports the synchronous serial interface timing requirements. Verify that the operating voltage range aligns with the system's 2.7 V to 5.25 V specification.

Part Context

This part belongs to the AD7877 series of touch screen controllers manufactured by Analog Devices Inc. It is functionally similar to the AD7843 but offers additional integrated peripherals such as the internal DAC and temperature sensor within a compact chip-scale package.

Replacement Considerations

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