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Analog Microelectronics

CAV424 Datasheet Preview

CAV424 Datasheet

Converter IC

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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




Analog Microelectronics

CAV424 Datasheet Preview

CAV424 Datasheet

Converter IC

No Preview Available !

Converter IC for Capacitive Signals
CAV424
ELECTRICAL SPECIFICATIONS
Tamb = 25°C, VCC = 5V (unless otherwise noted)
Parameter
Symbol
Conditions
Min.
Supply
Supply Voltage
Maximum Supply Voltage
Quiescent Current
Temperature Specifications
Operating
Storage
Junction
Thermal Resistance
Reference Oscillator
Oscillator Capacitor Range
Oscillator Frequency Range
Oscillator Current
Capacitive Integrator 1 and 2
VCC
VCCmax
ICC
Tamb
Tst
Tj
Θja
Θja
COSC
fOSC
IOSC
ratiometric range
Tamb = –40 ... 85°C, GLP = 1
DIL16 plastic package
SO16 (n) plastic package
COSC = 1.6 CX1
ROSC = 250k
4.75
0.6
–40
–55
14
1
9.5
Capacitor Range 1
Capacitive Integrator Current 1
Capacitor Detection Sensitivity
Capacitor Range 2
Capacitive Integrator Current 2
Detection Frequency
CX1
IX1
CX
CX2
IX2
fDET
RCX1 = 500k
CX = (CX2 CX1 )/CX1
CX2 = CX1 (1 + CX )
RCX2 = 500k
CL1 = CL2 =1nF
10
4.75
5
10.5
4.75
Lowpass
Adjustable Gain
www.DatOaSuthpeuet tV4oUl.tcagoem
Corner Frequency 1
Corner Frequency 2
Resistive Load at PIN LPOUT
GLP
VLPOUT
fC1
fC2
RLOAD
R01 = 20k, CL1 =1nF
R02 = 20k, CL2 =1nF
1
1.1
200
Capacitive Load at PIN LPOUT
Temperature Coefficient VDIFF (together
with Input Stages)
Internal Resistor 1 and 2
CLOAD
dVDIFF /dT
R01, R02
VDIFF = VLPOUT - VM ,
Tamb = –40 ... 85°C
Temperature Coefficient R01,02
dR01,02 /dT
Tamb = –40 ... 85°C
Ratiometric Error of VLPOUT
RAT@VDIFF*
* RAT @ VDIFF = 2 [1.05 VDIFF(VCC = 5V) – VDIFF(VCC = 5.25V)]/[VDIFF(VCC = 5V) + VDIFF(VCC = 5.25V)]
Typ.
Max.
Unit
5.00 5.25
V
17 V
1.0 1.4 mA
85 °C
125 °C
150 °C
70 °C/W
140 °C/W
1800
pF
130 kHz
10 10.75 µA
1000
pF
5 5.38 µA
100 %
2000
pF
5 5.38 µA
2 kHz
±100
20
1.9
0.11
10
VCC – 1.1
8
8
50
V
kHz
kHz
k
pF
ppm/°C
k
10-3/°C
%FS
analog microelectronics
January 2002
2/7


Part Number CAV424
Description Converter IC
Maker Analog Microelectronics
Total Page 7 Pages
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