AD7879WARUZ-RL7

Overview

The AD7879WARUZ-RL7 is a 12-bit successive approximation analog-to-digital converter (SAR ADC) designed for 4-wire resistive touch screen interfaces. Operating on a single 1.6 V to 3.6 V supply, it delivers throughput rates of 105 kSPS with a shutdown current of less than 6 µA. The device integrates low on-resistance switches for driving touch screens and includes preprocessing blocks comprising median and averaging filters to reduce noise. It features an SPI serial interface, user-programmable conversion parameters, and auxiliary inputs for battery monitoring or general-purpose I/O.

Feature Summary

• 12-bit SAR ADC with 105 kSPS throughput rate
• Integrated median and averaging filters for noise reduction
• Low power operation: 1.6 V to 3.6 V supply, <6 µA shutdown current
• Qualifies for automotive applications per AEC-Q100 standards

Applications

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

Procurement Notes

Verify the specific suffix 'RL7' indicates reel packaging when sourcing. Confirm the 'W' designation corresponds to the TSSOP package variant. Ensure compatibility with the host system's voltage levels and serial interface requirements before integration.

Selection Notes

Select this component for systems requiring low-voltage operation and integrated touch screen drive capabilities. The AD7879W supports SPI interfaces; verify if I2C compatibility is required, as that necessitates the AD7879-1W variant. Consider the thermal resistance of the TSSOP package for heat dissipation in enclosed designs.

Part Context

This part belongs to the AD7879W family of touch screen controllers from Analog Devices. It is distinct from the AD7879-1W, which utilizes an I2C interface instead of SPI. The RL7 suffix denotes tape and reel packaging for automated assembly processes.

Replacement Considerations

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