CAV424 - C/V-Converter for Single and Differential Measurement

Datasheet

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.

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	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 (RoHS certificate)
Product lifecycle	obsolete

General Documents

Datasheet CAV424	Datasheet
Product flyer CAV424	Flyer
IC package catalog	Package catalog

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

Design Support

Excel dimensioning and calibration sheet for CAV424.	CAV424_Cali
User guide for CAV424's breadboard.	CAV424-BB

Typical Application Circuits with Blockdiagram

CAV424 used for differential capacitance measurements. — Differential capacitance measurement with CAV424 as analog front end for a µC.

CAV424 used for single input capacitance measurements. — CAV424 with single input capacitance and adjustable, analog ratiometric voltage output.