AD7889ACBZ-500R7

Overview

The AD7889ACBZ-500R7 is a 12-bit successive approximation analog-to-digital converter (SAR ADC) designed for touch screen controller applications. It operates on a single supply voltage ranging from 1.6 V to 3.6 V and achieves a throughput rate of 105 kSPS. The device features an SPI serial interface, integrated median and averaging filters for noise reduction, and programmable conversion parameters. It supports touch pressure measurement, temperature monitoring, and auxiliary inputs including battery monitoring or general-purpose I/O.

Feature Summary

• 12-bit SAR ADC with 105 kSPS throughput rate
• Single 1.6 V to 3.6 V power supply operation
• Integrated median and averaging filters for noise suppression
• SPI serial interface with automatic conversion sequencer

Applications

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

Procurement Notes

Verify the specific ordering suffix ACBZ-500R7 against the manufacturer's current documentation to confirm package type and reel quantity specifications. Ensure compatibility with system requirements regarding the SPI interface and low-voltage operation range before procurement.

Selection Notes

Select this component for applications requiring low-power touch screen digitization within a 1.6 V to 3.6 V supply range. Consider the integrated filtering capabilities for environments with LCD noise. Verify that the host system supports the required SPI communication protocol and can accommodate the specified shutdown current consumption.

Part Context

This part belongs to the AD7879/AD7889 series of low-voltage touch screen controllers. The AD7889 variant specifically utilizes an SPI interface, distinguishing it from the AD7889-1 which uses an I2C interface. Both variants share similar functional blocks but differ in their serial communication protocols.

Replacement Considerations

The AD7879 serves as a direct functional substitute within the same family, sharing identical electrical characteristics and pinouts. Users must verify that the replacement part matches the required serial interface configuration for their specific design implementation.