AD7142ACPZ-1500RL7

Overview

The AD7142ACPZ-1500RL7 is a programmable capacitance-to-digital converter (CDC) designed for capacitive touch sensor applications. It features 14 input channels routed through a switch matrix to a 16-bit sigma-delta converter operating at 250 kHz. The device operates on a 2.6 V to 3.6 V supply and includes an SPI-compatible serial interface, interrupt output, and GPIO. On-chip calibration logic automatically compensates for environmental changes, ensuring reliable detection of buttons, scroll bars, or wheels without external tuning components.

Feature Summary

• 14-channel capacitance sensing with 16-bit resolution
• On-chip automatic environmental calibration and adaptive thresholds
• SPI-compatible serial interface with separate VDRIVE level
• Low power consumption: <1 mA full power, 50 µA low power mode

Applications

• Personal music and multimedia players
• Cell phones and smart hand-held devices
• Digital still cameras
• Television, A/V, and remote controls
• Gaming consoles

Procurement Notes

Verify the specific suffix -1500RL7 against the manufacturer's current ordering guide to confirm packaging quantity and reel specifications. Ensure compatibility with the host processor's SPI voltage levels via the VDRIVE pin. Confirm that the LFCSP-32 package thermal requirements are met in the final design.

Selection Notes

Select this component when a high-resolution CDC with integrated calibration is required for portable devices. The AD7142 variant is chosen over the AD7142-1 specifically for SPI interface compatibility. Consider the 36 ms update rate and 1 fF resolution for sensitive touch applications. Ensure the system can support the required 10 kB ROM and 600 bytes RAM for complex sensor software if needed.

Part Context

This part belongs to the AD7142 family of capacitance-to-digital converters from Analog Devices. It shares functional similarities with the AD7142-1 but differs in its serial communication protocol, utilizing SPI instead of I2C. The -1500RL7 designation indicates a specific tape and reel packaging configuration for automated assembly.

Replacement Considerations

The AD7142ACPZ-500RL7 is a verified alternative within the same family, offering identical functionality with a different packaging quantity suffix. No other direct substitutes are confirmed in the provided documentation.