CAV444 - C/V-Converter IC with Linear Voltage Output

Datasheet

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

Humidity measurement
Distance measurement

Capacitive pressure sensors
Level sensing

Material identification
Object detection

Humidity measurement
Distance measurement
Capacitive pressure sensors

Level sensing
Material identification
Object detection

Short Specifications

Supply Voltage (V_CC)	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 (RoHS certificate)
Product lifecycle	obsolete

General Documents

Datasheet CAV444	Datasheet
Product flyer CAV444	Flyer
IC package catalog	Package catalog

For die size and padout please contact sales@analogmicro.de.

Design Support

Excel dimensioning and calibration sheet for CAV444.	CAV444_Cali
User guide for CAV444's breadboard.	CAV444-BB
Application note: Construction of capacitive sensors with 0 .. 5 V or 0 .. 10 V output	CAV444-AN01
Application note: Construction of capacitive sensors with 4 .. 20 mA output	CAV444-AN02

Typical Application Circuit with Blockdiagram

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