AD7148ACPZ-1REEL

Overview

The AD7148ACPZ-1REEL is a programmable capacitance-to-digital converter (CDC) designed for single-electrode capacitive sensors. It features eight sensor inputs, a 16-bit resolution, and an I2C-compatible serial interface with a separate VDRIVE level. The device operates on a 2.6 V to 3.6 V supply, consuming 1 mA in full power mode and 21.5 μA in low power mode. It includes on-chip automatic calibration logic and adaptive thresholds to compensate for environmental changes.

Feature Summary

• Integrated capacitance-to-digital conversion with femtofarad resolution
• On-chip automatic calibration and environmental compensation logic
• I2C-compatible serial interface with independent voltage drive level
• Programmable touch controller supporting buttons, scroll bars, and wheels

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 current documentation to confirm package type and reel specifications. Ensure compatibility with the host system's I2C voltage levels using the VDRIVE pin. Confirm that the LFCSP-16 package dimensions align with the PCB footprint design guidelines provided in the datasheet.

Selection Notes

Select this component when designing systems requiring high-resolution user input methods like sliders or wheels. It is suitable for applications needing minimal software overhead due to its on-chip calibration and threshold logic. Consider the low power mode capabilities for battery-operated portable devices where extended standby times are critical.

Part Context

This part belongs to the AD714x series of CapTouch controllers from Analog Devices. It is functionally similar to the AD7147 but provides eight sensor inputs instead of thirteen. The AD7148 is optimized for ultrathin applications using single-layer PCB sensors and integrates directly with standard microcontrollers via the I2C interface.

Replacement Considerations

The AD7147ACPZ-RL serves as a compatible alternative for designs requiring additional sensor channels. Both parts share the same LFCSP-16 package and register map compatibility, facilitating potential migration between the two models without significant hardware redesign.