C/V-Converter for Single and Differential Measurement


CAV424 is an integrated capacitance-to-voltage converter suitable for the measurement of single or differential input capacitances. It generates a ratiometric output voltage signal and can be used as front end for µC. The IC’s wide measurement range, low EM susceptibility and high sensitivity allow a multitude of applications.




  • 1.Humidity measurement
  • 2.Distance measurement
  • 3.Capacitive pressure sensors
  • 4.Level sensing
  • 5.Material identification
  • 6.Object detection

Short Specifications

Supply Voltage (VCC) 5 V ± 5%
Capacitance input range 5 pF .. 40 nF (single), 0 .. 40 nF (differential)
Voltage output 1 .. 4 V (ratiometric), adjustable
Reference voltage 2.5 V (ratiometric)
Temperature range -40 °C .. 105 °C
Temperature sensor output 2.20 .. 2.45 V (8 mV/K)
Package / Delivery forms SO16, on DIL16-adapter, sawn 6″ wafer on blue foil
RoHS status compliant


General Documents

Datasheet CAV424
Product flyer CAV424
IC package catalog

Design Support

Excel dimensioning and calibration sheet for CAV424.
User guide for CAV424’s breadboard.


Typical Application Circuits with Block diagram

Differential capacitance measurement with CAV424 as an analog front end for a µC.
CAV424 used for differential capacitance measurements.
CAV424 with single input capacitance and adjustable, analog ratiometric voltage output.
CAV424 used for single input capacitance measurements.


Ordering Codes

Order number Delivery form
CAV424-0-SO16 SO16(n) package
CAV424-WAF sawn wafer on 6″ blue foil
CAV424-Adapt CAV424 soldered to an SO16-DIL16 adapter



Order Number Description
BBCAV424 A preassembled breadboard with easily adaptable capacitance range. Suitable for first experiments using CAV424. Please see the document CAV424-BB for further information.