ADIAD7147PACPZ-RL

Overview

The AD7147PACPZ-RL is a high-precision CapTouch controller designed for use with capacitance sensors such as buttons, scroll wheels, and sliders. It features 13 input channels and a 16-bit sigma-delta capacitance-to-digital converter (CDC) that provides high resolution and high common-mode rejection. The device includes on-chip calibration logic to compensate for environmental changes like temperature and humidity.

Why Choose This Part

The AD7147 excels in low-power environments with an integrated sequencer that allows the host microcontroller to remain in sleep mode while the CDC polls the sensors. Its 16-bit resolution and active shield drivers ensure high sensitivity and immunity to parasitic capacitance and EMI. The 250k sampling rate and SPI interface facilitate rapid response times for fluid user interfaces.

Applications

Getting Started

Start development by interfacing the AD7147 with a microcontroller via the SPI bus and providing a stable 2.6V to 3.6V supply. Analog Devices provides the EVAL-AD7147EBZ evaluation board which includes software for configuring sensor thresholds and calibration settings. Engineers should pay close attention to PCB layout, specifically keeping traces from the sensors to the CIN pins short and guarded.

AD7147 Family

Comparing specs that differ across variants. The current part is highlighted.

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