Wide Supply Voltage Range: 5.18V Wide Operating Temperature Range: -25

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Wide Supply Voltage Range: 5.18V Wide Operating Temperature Range: -25

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Converter Capacitive Signals
Wide Supply Voltage Range: 5.18V Wide Operating Temperature Range: -25°C.+85°C High Detection Sensivity Relative Capacitive Changes: 100% Detection Frequency 2kHz Adjustable Voltage Output Adjustable Namur Current Output Power Dissipation:
CAN404
GENERAL DESCRIPTION
CAN404 universal multipurpose interface capacitive sensors contains complete signal conditioning unit chip. CAN404 detects relative capacitive change measuring capacity fixed reference capacity. optimized capacities wide range 10pF with possible changes capacity 100% reference capacity. CAN404 offers output signal proportional change measuring capacity adjusted active lowpass filter. Referring output signal internal reference allows temperature compensation. addition voltage output, voltage-to-current interface according Namur norm implemented. With only external components, CAN404 suitable great variety applications including zero compensation.
APPLICATIONS
Industrial Process Control Distance Measurement Pressure Measurement Humidity Measurement Level Control
BLOCK DIAGRAM
COSC
Reference Oscillator fosc
VBCX1
Capacitive Oscillator Capacitive Oscillator
Imax
VSTAB
LOWPASS
Internal Power Supply
LPOUT
RCX1
RCX2
ROSC RSUP
Figure
analog microelectronics
Analog Microelectronics GmbH Fahrt 55124 Mainz Internet: www.analogmicro.de Phone: (0)6131/91 Fax: (0)6131/91 E-Mail: info@analogmicro.de
March Rev.
Converter Capacitive Signals
ELECTRICAL SPECIFICATIONS
Tamb 25°C, 8.2V, (unless otherwise noted)
Parameter Supply Voltage Range Supply Current Range Symbol ICC,0 Temperature Specifications Operating Storage Junction Reference Voltage Reference Voltage 4.5V Temperature Coefficient VVSTAB Reference Voltage Temperature Coefficient Reference Voltage Temperature Coefficient Reference Oscillator Oscillator Capacitor Oscillator Frequency Oscillator Current Capacitive Oscillators Capacitor Capacitive Oscillator Current Capacitive Detection Sensitivity Capacitor Capacitive Oscillator Current Detection Frequency Lowpass Adjustable Gain Adjustable Gain Output Voltage Load Capacitor LPOUT Corner Frequency Corner Frequency Temperature Coefficient VOUT (with input stages) Internal Resistors Temperature Coefficient R01,02 Power Supply Rejection Ratio Namur Output Stage Threshold Voltage Output Resistance Temperature Coefficient VSET ZOUT TKICC Application Notes ZOUT dVCC dICC Tamb 85°C, Namur: active ±200 VLPOUT CLPOUT TKVOUT R01, TKR01, PSRR Tamb 85°C 18V; AGES VOUT VLPOUT Tamb 85°C ±200 Application Notes Application Notes fDET RCX1 400k (CX2 )/CX1 RCX2 400k =1nF, COSC 20pF 4.75 10.5 4.75 COSC fOSC IOSC ROSC 200k COSC VSTAB TKVSTAB TKVBG TKVM Tamb 85°C internal usage only Tamb 85°C internal usage only Tamb 85°C 1.23 4.27 ±100 1.30 ±100 ±100 Tamb Namur: active, VSET Namur: active, Application Notes Conditions Min. Typ.
CAN404
Max.
Unit
4.73
ppm/°C
1.37
ppm/°C
2.15
ppm/°C
2200 10.8
1000 5.38 2000 5.38
ppm/°C 10-3/°C
ppm/°C
analog microelectronics
March
Converter Capacitive Signals
BOUNDARY CONDITIONS
Parameter Current Sense Resistor Gain Resistor Gain Resistor Capacitor VSTAB Capacitor Capacitor Capacitor Namur Resistor Resistor (Capacitive Oscillator Resistor (Capacitive Oscillator Resistor (Reference Oscillator) Resistor (Internal Power Supply) Resistor (Reference Voltage 4.5V) Resistor (Internal Stabilized Voltage) Symbol RL1+ RL3+ CBG1 CBG2 RN1+ RCX1 RCX2 ROSC RSUP RBG1 RBG2 Min. Typ.
CAN404
Max.
Unit
performance entire system important that Resistors have have small temperature coefficient. offset compensation over temperature only achieved choosing resistors RCX1 RCX2 with same temperature coefficient very close placement them entire circuit.
FUNCTIONAL DIAGRAM
COSC
Reference Oscillator fosc
COSC
Capacitive Oscillator Capacitive Oscillator
IOUT Ground
Imax
VSTAB
Lowpass
Internal Power Supply
RBG1
CBG2 CBG1
LPOUT
RCX1
RCX2
ROSC RSUP
RBG2
RCX1
RCX2
ROSC
RSUP
Figure
analog microelectronics
March
Converter Capacitive Signals
FUNCTIONAL DESCRIPTION
CAN404
Basically CAN404 composed input stages, signal processing unit voltage-tocurrent interface according Namur standard. reference oscillator with frequency, adjusted capacity COSC, drives symmetrically built oscillators synchronously clock phase. capacitors determine amplitude driven oscillators. difference oscillator amplitudes gives relative change capacities each other with high common mode rejection high resolution. This difference signal rectified lowpass filter. corner frequency gain adjusted with external components. output lowpass filter connected voltage-to-current interface (Namur output). maximum current output adjustable externally. Namur operation (Figure external reference point Ground connected resistors ground (GND). minimum supply voltage entire system depends minimum supply voltage (5V) value input resistance power supply current sense resistor fulfil following relationship: ,min ,max rated Namur operation characterised VS,n (8.2 0.1) RI,n (1000 Adjustment CAN404: zero adjustment differential output signal VOUT VLPOUT made resistors RCX1 RCX2 case that capacitors have nearly same value (distance sensor without target). Therefore resistors RCX1 RCX2 varied until output voltage zero: VOUT greatest possible change capacitors (distance sensor with target) results maximum output signal that amplified lowpass. maximum amplification limited maximum allowed output voltage VLPOUT (see Electrical Specifications). Namur operation, additional adjustments required. minimum output signal VLPOUT,min (for ,min (for ,max
maximum output signal amplified lowpass value VLPOUT,max 3.2V
output current consists supply current ICC,0 system additional component. maximum output current VLPOUT,max adjusted ICC,max 2.5mA
analog microelectronics
March
Converter Capacitive Signals
CAN404
minimum output current VLPOUT,min, typical value which greater than value supply current chosen. That means ICC,min 0.9mA transfer function Namur output adjusted resistor voltage VSET. resistor calculated VLPOUT ,max VLPOUT ,min ,max ,min
voltage VSET given VSET ,min LPOUT ,min VSET Sample calculations typical values external components listed separate available Application Notes.
voltage VSET adjusted voltage divider RN2:
analog microelectronics
March
Converter Capacitive Signals
PINOUT
LPOUT VBVB+ VSTAB COSC RCX1 RCX2 ROSC RSUP
CAN404
NAME LPOUT RSUP ROSC RCX2 RCX1 COSC VSTAB
BESCHREIBUNG Corner Frequency Lowpass Gain Adjustment Lowpass Gain Adjustment Lowpass Corner Frequency Lowpass Gain Adjustment Lowpass Output Lowpass Voltage Setting Namur Current Output Ground Power Supply (negative connection) Power Supply (positive connection) Current Definition Internal Power Supply Current Definition Reference Oscillator Current Adjustment Capacitive Oscillator Current Adjustment Capacitive Oscillator Internal Stabilised Voltage Capacitor Reference Oscillator Reference Voltage Oscillator Capacitor Reference Voltage 4.5V Oscillator Capacitor
Figure
DELIVERY
CAN404 available version: packages SO20 packages Dice blue foil
information provided herein believed reliable; however, Analog Microelectronics assumes responsibility inaccuracies omissions. Analog Microelectronics assumes responsibility this information, such information shall entirely user's risk. Prices specifications subject change without notice. patent rights licences circuits described herein implied granted third party. Analog Microelectronics does authorise warrant Analog Microelectronics product life support devices and/or systems.
analog microelectronics
March

Wide Supply Voltage Range: 5.18V Wide Operating Temperature Range: -25

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