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CAV424 데이터시트 PDF




Analog Microelectronics에서 제조한 전자 부품 CAV424은 전자 산업 및 응용 분야에서
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부품번호 CAV424 기능
기능 Converter IC
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CAV424 데이터시트, 핀배열, 회로
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
www.DataSheet4U.com
CAV424
VTEMP
7
T Sensor
COSC
12
Reference
Oscillator
CX1
16
CX2
14
Integrator 1
Integrator 2
RCX1 RCX2 RCOSC
231
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: +49 (0)6131/91 073 – 0
Fax: +49 (0)6131/91 073 – 30
E–mail: info@analogmicro.de
January 2002
1/7
Rev. 1.3




CAV424 pdf, 반도체, 판매, 대치품
Converter IC for Capacitive Signals
CAV424
parison of the two amplitudes pro-
duces a signal which corresponds to
the change in capacitance of CX1 and
VOSC
VOSC,HIGH
CX2 relative to one another. This dif-
ference signal is rectified in an ensu-
ing low pass. The filtered DC signal
is transferred to the differential, ad-
VOSC,LOW
justable output stage. Individual cir-
cuit variables, such as filter constants
and amplification, can be set with just
T 3T T
24
2T Time t
a few external components. By using
the integrators and their capacitances Figure 2: oscillator voltage curve
CX1 and CX2, swings in capacitance of 5% to 100% in relation to the measurement reference capacitance
can be measured. As CX1 can be varied in a range of 10 pF to 1 nF, the range of measurement for the
measurement signal capacitance is 0-10.5 pF to 0-2 nF.
The way a capacitive sensor functions whose signal can be conditioned with a CAV424 is described in
detail in the following section. Simple dimensional requirements are given, permitting a sensor system
to be assembled.
The CAV424 reference oscillator
The reference oscillator charges up
and then discharges the external
oscillator capacitance COSC, the
VOSC
VCX1
internal parasitic capacitance of the
IC, COSC,PAR,INT, and the external
VCX2
parasitic capacitance COSC,PAR,EXT VCLAMP
www.Da(tafrSohmeet4aU.cporminted board assembly, for
example). Oscillator capacitance COSC
is dimensioned as follows:
COSC = 1.6 CX1 ,
T 3T T
24
Figure 3: integrator voltage curve
where CX1 is the fixed capacitance
(reference capacitance) of a capacitive sensing element.
2T Time t
The reference oscillator current IOSC is determined via external resistance ROSC and reference voltage
VM:
IOSC
=
VM
ROSC
The frequency of the reference oscillator fOSC is given by
( )fOSC
=
2 ⋅ ∆VOSC
COSC
I OSC
+ COSC,PAR,INT
+ COSC,PAR,EXT
,
analog microelectronics
January 2002
4/7

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CAV424 전자부품, 판매, 대치품
Converter IC for Capacitive Signals
CAV424
Application Example:
The following values are given:
fixed capacitance CX1:
50pF
varying capacitance CX2: 50 ... 100pF
Calculation:
With the equations given in the boundary conditions, the following values for the devices can be cal-
culated:
COSC: 80pF
CL1:
10nF
CL2:
10nF
PINOUT
RCOSC 1
RCX1
2
RCX2
3
RL 4
LPOUT 5
VM 6
VTEMP 7
www.DataNSh.Cee.t4U.com 8
16 CX1
15 CL1
14 CX2
13 CL2
12 COSC
11 VCC
10 GND
9 N.C.
Figure 5: pinout CAV424
DELIVERY
PIN NAME
1 RCOSC
2 RCX1
3 RCX2
4 RL
5 LPOUT
6 VM
7 VTEMP
8 N.C.
9 N.C.
10 GND
11 VCC
12 COSC
13 CL2
14 CX2
15 CL1
16 CX1
DESRIPTION
Current Definition of Ref. Oscillator
Current Adjustment of Cap. Integrator 1
Current Adjustment of Cap. Integrator 2
Gain Adjustment
Output
Reference Voltage 2.5V
Temperature Sensor
Not Connected
Not Connected
IC Ground
Supply Voltage
Capacitor of Reference Oscillator
Corner Frequency of Lowpass 2
Integrator Capacitor 2
Corner Frequency of Lowpass 1
Integrator Capacitor 1
The CAV424 is available in version:
16 pin DIL
SO 16 (n) (maximum power dissipation PD = 300mW)
Dice on 5“ blue foil
The information provided herein is believed to be reliable; however, Analog Microelectronics assumes no responsibility for inaccuracies or omissions. Analog Microelectronics assumes no responsibility for the
use of this information, and all use of such information shall be entirely at the user's own risk. Prices and specifications are subject to change without notice. No patent rights or licences to any of the circuits
described herein are implied or granted to any third party. Analog Microelectronics does not authorise or warrant any Analog Microelectronics product use in life support devices and/or systems.
analog microelectronics
January 2002
7/7

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