AD7147AACBZ-500RL7

Overview

The AD7147AACBZ-500RL7 is a CapTouch programmable controller for single-electrode capacitance sensors manufactured by Analog Devices Inc. It integrates a 16-bit, 250 kHz sigma-delta capacitance-to-digital converter (CDC) with 13 sensor inputs and on-chip environmental calibration logic. The device operates on a 2.6 V to 3.6 V supply and features an SPI-compatible serial interface. Key specifications include a 9 ms update rate for all 13 inputs, femtofarad resolution, and low power consumption of 28.96 μA in low power mode. It is housed in a 25-ball, 2.3 mm × 2.1 mm WLCSP package.

Feature Summary

• Integrated 16-bit CDC with 13 sensor inputs and automatic environmental calibration
• SPI-compatible serial interface with separate VDRIVE level for logic levels
• Low power operation: 28.96 μA typical current in low power mode
• On-chip adaptive threshold and sensitivity levels with calibration RAM

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 AACBZ-500RL7 against official Analog Devices documentation to confirm package type and reel quantity. Ensure compatibility with the host processor's SPI interface voltage levels using the VDRIVE pin. Confirm availability through authorized distributors as supply status may vary.

Selection Notes

Select the AD7147A variant if an SPI interface is required; choose the AD7147A-1 for I2C compatibility. Consider the low power mode for battery-operated applications to achieve significant power savings. Ensure the PCB design accommodates the 25-ball WLCSP package dimensions and provides adequate shielding via the ACSHIELD output.

Part Context

The AD7147A belongs to the AD714x family of CapTouch controllers designed for portable electronics requiring novel user input methods. It replaces traditional mechanical buttons with capacitive sensing solutions, enabling ultrathin designs. The device simplifies system design by integrating calibration logic and adaptive thresholds directly on-chip.

Replacement Considerations

The AD7147ACPZ-1500RL7 is a compatible alternative within the same family but utilizes an LFCSP-24 package and an I2C interface instead of SPI. Verify interface compatibility and physical footprint differences before substitution.