CAV444中文資料WOLFSPEED數(shù)據(jù)手冊(cè)PDF規(guī)格書

FEATURES

? large measurement capacitance input

range: 10pF up to 10nF

? ratiometric voltage output

? linear transfer function

? adjustable offset and gain

? fast response time

? measurement oscillator frequency:

1kHz-240kHz

? integrated temperature sensor

? supply voltage 5V ± 5

? large temperature range:

–40°C...+105°C

? easy-to-use calibration procedure

(Excel–sheet)

? available in SO16 or as die

? RoHS conform

BLOCK DIAGRAM

GENERAL DESCRIPTION

CAV444 is an integrated C/V converter suitable for

the signal-processing in capacitive sensor systems. Its output voltage is a linear function of the

connected measurement capacitance CM and 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.

CAV444 provides the complete electronics needed

for the conversion of capacitive input signals into

voltage output signals, which can be 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.