CAV414

Converter IC for Capacitive Signals FEATURES Wide Supply Voltage Range: 6...35V Wide Operating Temperature Range: –40°C...+85°C High Detection Sensitivity of Relative Capacitive Changes: 5% – 100% Detection Frequency up to 2kHz Adjustable Voltage Range: 0...5/10V, other Reference Voltage Source: 5V Protection against Reverse Polarity Output Current Limitation Adjustable with only two Resistors CAV414 GENERAL DESCRIPTION The CAV414 is an universal multipurpose interface for capacitive sensors and contains the complete signal processing unit on chip. The CAV414 detects the relative capacitive change of a measuring capacity to a fixed reference capacity. The IC is optimised for capacities in the wide range of 10pF to 2nF with possible changes of capacity of 5% to 100% of the reference capacity. The voltage output is formed by a high accuracy instrumentation amplifier in combination with an operational amplifier. With only a few external components, the CAV414 is suitable for a great variety of applications including a zero compensation. APPLICATIONS Industrial Process Control Distance Measurement Pressure Measurement Humidity Measurement Level Control DELIVERY DIL16 packages (samples) SO16(n) packages Dice on 5“ blue foil BLOCK DIAGRAM www.DataSheet4U.com COSC 12 Reference Oscillator CAV414 IA OP VCC 9 CX1 16 Integrator 1 Integrator 2 Signal Conditioning VOUT 8 7 10 CX2 14 GAIN GND Voltage/Current Reference 15 13 4 5 6 2 3 1 11 ...