AD7147PACPZ-1500R7

Overview

The AD7147 is a CapTouch programmable controller for single-electrode capacitance sensors, featuring a 16-bit sigma-delta converter and 13 sensor inputs. It operates on a 2.6 V to 3.6 V supply with full power consumption of 1 mA and low power mode at 21.5 μA. The device provides femtofarad resolution and an update rate of approximately 9 ms for all inputs. It includes automatic environmental calibration, adaptive thresholds, and an SPI-compatible serial interface. The component is housed in a 24-lead, 4 mm × 4 mm LFCSP package.

Feature Summary

• 13-channel capacitance-to-digital conversion with 16-bit resolution
• Automatic environmental calibration and adaptive threshold logic
• SPI-compatible serial interface with separate VDRIVE level
• Low power operation: 21.5 μA typical in low power mode

Applications

• Cell phones
• Personal music and multimedia players
• Smart handheld devices
• Television, A/V, and remote controls
• Gaming consoles

Procurement Notes

Verify the specific ordering suffix against the manufacturer's official documentation to confirm interface type and packaging details. Ensure compatibility with the host processor's voltage levels, particularly regarding the VDRIVE pin configuration for the serial interface.

Selection Notes

Select this component for applications requiring high-resolution capacitive sensing without external RC components. Consider the 24-lead LFCSP package constraints and the need for a companion algorithm on the host processor if implementing scroll bars or wheels rather than simple buttons.

Part Context

This part belongs to the AD7147 series of CapTouch controllers designed for portable electronics. It integrates a switch matrix and on-chip RAM for calibration data, distinguishing it from standard ADCs by its specialized focus on single-electrode capacitance sensing and environmental compensation.

Replacement Considerations

The AD7142 offers a similar capacitance-to-digital conversion function but utilizes an SPI interface and features a 32-lead LFCSP package with 14 channels. Verify register map compatibility and physical footprint differences when considering substitution.