CAV414 Datasheet, PDF (1/6 Pages) Analog Microelectronics – Converter IC for Capacitive Signals

Converter IC for Capacitive Signals CAV414
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
APPLICATIONS
• Industrial Process Control
• Distance Measurement
• Pressure Measurement
• Humidity Measurement
• Level Control
BLOCK DIAGRAM
GENERAL DESCRIPTION
The CAV414 is an universal multipurpose in-
terface 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 ref-
erence capacity.
The voltage output is formed by a high accu-
racy instrumentation amplifier in combination
with an operational amplifier.
With only a few external components, the
CAV414 is suitable for a great variety of ap-
plications including a zero compensation.
DELIVERY
• DIL16 packages (samples)
• SO16(n) packages
• Dice on 5“ blue foil
COSC
12
CX1
16
CX2
14
Reference
Oscillator
Integrator 1
Integrator 2
Signal Conditioning
CAV414 VCC
9
IA
VOUT
OP
8
GAIN
7
Voltage/Current
Reference
GND
10
VREF
11
Figure 1
15
CL1
13 4 5 6
2
3
1
CL2 RL LPOUT VM RCX1 RCX2 RCOSC
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 2001
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Rev. 2.1