AD7879-1WARUZ-RL7

Overview

The AD7879-1WARUZ-RL7 is a 12-bit successive approximation analog-to-digital converter (SAR ADC) designed for resistive touch screen applications. It operates on a single 1.6 V to 3.6 V supply and supports I²C serial communication. The device integrates low on-resistance switches for driving 4-wire screens, an automatic conversion sequencer, and preprocessing filters including median and averaging functions to reduce noise. Key features include auxiliary input/battery monitoring capabilities, programmable GPIO, and interrupt outputs. It achieves throughput rates of 105 kSPS with a shutdown current of less than 6 µA.

Feature Summary

• 12-bit SAR ADC with 105 kSPS throughput rate
• I²C serial interface compatible with standard protocols
• Integrated median and averaging filters for noise reduction
• Auxiliary analog input supporting battery monitoring (0.5 V to 5 V)
• Shutdown mode consuming maximum 6 µA

Applications

• Automotive infotainment systems
• Smart handheld devices and personal digital assistants
• Point-of-sale terminals
• Medical devices requiring precise touch input
• Touch screen monitors

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and interface configuration. Ensure compatibility with the target system's voltage levels and communication protocol requirements before integration.

Selection Notes

Select this component when an I²C interface is required for touch screen control in space-constrained designs. Consider the 1.6 V minimum operating voltage for low-power battery applications. Verify that the 12-bit resolution meets the spatial accuracy requirements of the specific touch panel implementation.

Part Context

This part belongs to the AD7879W family from Analog Devices. The 'AD7879-1' designation indicates the I²C interface variant, distinguishing it from the SPI-based AD7879W. The 'RL7' suffix typically denotes reel packaging specifications as defined by the manufacturer.

Replacement Considerations

Direct substitutes within the same family include the AD7879W series for SPI interfaces or other packages like LFCSP. Cross-vendor replacements require verification of pin compatibility and register mapping.