器件名称:
QT301-IS
功能描述:
CAPACITANCE TO ANALOG CONVERTER
文件大小:
263.66KB 共11页
简 介:
jfbkLQ CAPACITANCE TO ANALOG CONVERTER QT301 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 SYNC CAL_DN SNS1 VSS 1 8 VDD CAL_UP PWM SNS2 QT301 2 3 4 7 6 5 APPLICATIONS Fluid level sensors Proximity sensors Moisture detection Position sensing Transducer driver Material sensors 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. The PWM range is set via two inputs that control the starting and ending point of the conversion range. For example, if the capacitance range of Cx is from 27pF to 38pF, the QT301 can be c……
