CAV444

C/V-Converter IC with Linear Voltage Output

Data Sheet
Flyer

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.

 

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 10 pF .. 10 nF
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 CAV444
Product flyer CAV444
IC package catalog

Design Support

Excel dimensioning and calibration sheet for CAV444.
User guide for CAV444’s breadboard.
Application note: Construction of capacitive sensors with 0 .. 5 V or 0 .. 10 V output
Application note: Construction of capacitive sensors with 4 .. 20 mA output

 

Typical Application Circuit with Blockdiagram

CAV444 with single input capacitance and adjustable, analog ratiometric voltage output (e.g. 1 .. 4 V).
CAV444 with single input capacitance and adjustable, analog ratiometric voltage output.

 

Ordering Codes and Product Inquiry / Samples

Order number Delivery form
CAV444-0-SO16 SO16(n) package
CAV444-WAF sawn wafer on 6″ blue foil
CAV444-Adapt CAV444 soldered to an SO16-DIL16 adapter

 

Accessories

Order Number Description
BBCAV444 A preassembled breadboard with easily adaptable capacitance range. Suitable for first experiments using CAV444. Please see the document CAV444-BB for further information.