AD7889-1ACBZ-500R7

Overview

The AD7889-1ACBZ-500R7 is a 12-bit successive approximation analog-to-digital converter (SAR ADC) designed for touch screen applications. It features an I²C interface and operates on a single supply voltage ranging from 1.6 V to 3.6 V. The device includes low on-resistance switches for driving 4-wire resistive touch screens, achieving a throughput rate of 105 kSPS. Key specifications include a maximum shutdown current of 6 μA, programmable median and averaging filters for noise reduction, and auxiliary inputs for battery monitoring or general-purpose I/O.

Feature Summary

• 12-bit SAR ADC with 105 kSPS throughput rate
• I²C serial interface with configurable addressing
• Integrated 4-wire resistive touch screen drivers
• Programmable median and averaging filters
• Shutdown mode consuming less than 6 μA

Applications

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

Procurement Notes

Verify the specific suffix '500R7' against official documentation to confirm reel packaging quantities and tape specifications. Ensure the I²C variant matches system bus requirements. Confirm operating temperature range compliance (-40°C to +85°C) for the target environment.

Selection Notes

Select this component when an I²C interface is required instead of SPI. The AD7889 provides the same core functionality as the AD7879 but utilizes SDA/SCL pins. Verify that the host processor supports the required I²C clock speeds up to 400 kHz. Consider the WLCSP package dimensions for space-constrained designs.

Part Context

This part belongs to the AD7879/AD7889 family of low-voltage touch screen controllers. The AD7889 variant specifically denotes the I²C interface capability, distinguishing it from the SPI-based AD7879. Both share identical electrical characteristics and pinouts for common interfaces.

Replacement Considerations

The AD7879-1ACPZ-500R7 is a functional equivalent within the same family, differing only in the physical package type (LFCSP vs. WLCSP). Verify footprint compatibility before substitution.