Product Features

CAV444  Converter IC with Linear Voltage Output

CAV444 is a capacitance-to-voltage converter IC for the measurement of single capacitances. Its ratiometric output voltage signal is proportional to the input capacitance. CAV444 can be used as stand-alone IC or as front end for µC. Its wide capacitance measurement range and high sensitivity allow various applications.

CAV444 is an integrated C/V converter suitable for the signal-processing in capacitive sensor systems. Its output voltage is a linear function of the connected measurement capacitance CM and ratiometric to the supply voltage. The IC is completely analog leading to a fast response time and a resolution only limited by the signal to noise ratio. CAV444 provides the complete electronics needed for the conversion of capacitive input signals into voltage output signals, which can be amplified.

Part Number: CAV444
Description: Converter IC for Capacitive Signals

Datasheet CAV444

Part Descriptions

CAV444 is an integrated circuit for capacitive sensing applications. The IC converts the connected input measurement capacitance into an output voltage, which is a linear function of the measurement capacitance. CAV444 can be used as stand-alone analog signal-processing IC or as front-end for a micro processor for electronically calibratable sensor systems.

Features of CAV444 ICS

• large measurement capacitance input range: 10pF up to 10nF
• ratiometric voltage output
• linear transfer function
• adjustable offset and gain
• fast response time
• measurement oscillator frequency: 1kHz-240kHz
• integrated temperature sensor
• supply voltage 5V ± 5%
• large temperature range:  –40°C...+105°C
• easy-to-use calibration procedure  (Excel–sheet)
• available in SO16 or as die
• RoHS conform

Applications of CAV444 ICS

• Humidity measurement
• Distance measurement
• Level sensing
• Material identification
• Object detection