CAV424 Datasheet, PDF (1/7 Pages) List of Unclassifed Manufacturers – Converter IC for Capacitive Signals

Converter IC for Capacitive Signals
CAV424
FEATURES
• Ratiometric Supply Voltage: 5V ± 5%
• Wide Operating Temperature Range:
–40°C...+85°C
• High Detection Sensitivity of Relative
Capacitive Changes: 5% – 100%
• Detection Frequency up to 2kHz
• Differential Output Signal with Great
Voltage Swing
• Integrated Temperature Sensor
• Adjustable with only two Resistors
APPLICATIONS
• Industrial Process Control
• Distance Measurement
• Pressure Measurement
• Humidity Measurement
• Level Control
BLOCK DIAGRAM
GENERAL DESCRIPTION
The CAV424 is an integrated C/V converter and
contains the complete signal processing unit for
capacitive signals on chip. The CAV424 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 dif-
ferential voltage output signal can be directly
connected to a following A/D converter or an-
other signal conditioning IC from Analog Mi-
croelectronics. Using the integrated temperature
sensor, digital adjustable systems can be built
easily.
DELIVERY
• DIL16 packages
• SO16(n) packages
• Dice put on 5“ blue foil
CAV424
VTEMP
7
T Sensor
COSC
12
Reference
Oscillator
CX1
16
CX2
14
Integrator 1
Integrator 2
RCX1 RCX2 RCOSC
2
3
1
VCC
11
Current Reference
Signal Conditioning
6
VM
5
LPOUT
10
15
GND CL1
13 4
CL2 RL
Figure 1: block diagram CAV424
analog microelectronics
Analog Microelectronics GmbH
An der Fahrt 13, D – 55124 Mainz
Internet: http://www.analogmicro.de
Phone: [phone] – 0
Fax: [phone] – 30
E–mail: [e-mail]
January 2002
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Rev. 1.3