FEATURES
• large measurement capacitance range:
5 pF up to 40 nF
• suitable for single and differential capacitive sensor heads
• high detection sensitivity
• ratiometric voltage output
• adjustable offset and gain
• fast response time
• integrated temperature sensor
• supply voltage 5V ± 5%
• large temperature range: –40°C...+105°C
• easy-to-use calibration procedure (Excelsheet)
• available in SO16 or as Die
• RoHS conform
GENERAL DESCRIPTION
CAV424 is an integrated C/V-converter suitable
for the capacitance measurement in single or
differential capacitive sensor systems. Its output
voltage is a linear function of the reciprocal measurement capacitance and it is 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.
CAV424 provides the complete electronics
needed for the conversion of single or differential
capactive input signals into voltage output signals,
which can be an amplified and offset adjusted
using external trimming resistors.
The IC can be used as stand-alone analog signalprocessing IC or as front-end for a micro processor for electronically calibratable sensor systems.
An Excel-sheet simplifies the external component’s dimensioning as well as the trimming of
complete sensor systems.