CAPACITANCE TO ANALOG CONVERTER

The QT301 charge-transfer (QT) IC is a self-contained Capacitance-to-Analog-Converter (CAC) capable of detecting femotofarad level changes in capacitance. This part is designed primarily for stand-alone instrumentation applications.
Primary applications include fluid level sensors, distance sensors, material detectors, transducer amplifiers for pressure and humidity sensing functions, and other uses requiring quantified capacitance data.
Unlike other Quantum products, the QT301 does not process its acquired data. Its only output is raw, unprocessed data in filterable PWM form that can be translated into an analog voltage by a simple RC network. This allows the designer to treat the device as a CAC for measurement applications.

● Capacitance to Analog Converter (CAC) IC
● Patented charge-transfer conversion method
● Sub-ranging Direct-to-Analog conversion
● Rescaleable PWM: wide dynamic range
● End-to-end calibration (gain, span) via CAL pins
● 100 kHz PWM
● Spread spectrum acquisition bursts for low noise
● Sample on demand via Sync pin
● Only one external sample capacitor

APPLICATIONS
● Proximity sensors
● Fluid level sensors
● Position sensing
● Moisture detection
● Material sensors
● Transducer driver