AD7879WARUZ-RL

Overview

The AD7879WARUZ-RL is a 12-bit successive approximation analog-to-digital converter (SAR ADC) designed for resistive touch screen control. It operates on a single 1.6 V to 3.6 V supply and achieves a throughput rate of 105 kSPS. The device integrates low on-resistance switches, a preprocessing block with median and averaging filters, and an automatic conversion sequencer. It supports serial communication interfaces and includes auxiliary inputs for battery monitoring or general-purpose I/O. The component is housed in a 16-lead LFCSP package and functions within an operating temperature range of -40°C to +85°C.

Feature Summary

• 12-bit SAR ADC with 105 kSPS throughput rate
• Integrated median and averaging filters for noise reduction
• Single-ended input type with 4-wire touch screen interface
• Shutdown mode current consumption of maximum 6 μA

Applications

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

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm package type and interface configuration. Ensure compatibility with system voltage requirements between 1.6 V and 3.6 V. Confirm that the selected variant matches the required serial interface protocol for the target application design.

Selection Notes

Select this component for applications requiring low-power touch digitization with integrated filtering capabilities. The 12-bit resolution and 105 kSPS speed are suitable for standard resistive touch interfaces. Consider the available package options if board space is constrained, ensuring the thermal characteristics of the chosen package meet the system's dissipation requirements.

Part Context

This part belongs to the AD7879/AD7889 family of low-voltage touch screen controllers manufactured by Analog Devices Inc. The series provides solutions for portable electronics requiring accurate position sensing. Variants within the family may differ in package style or interface support, such as SPI versus I2C configurations.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.