Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40

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Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40

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Converter Capacitive Signals
Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40°C.+85°C High Detection Sensitivity Relative Capacitive Changes: 100% Detection Frequency 2kHz Adjustable Voltage Range: 0.5/10V, other Reference Voltage Source: Protection against Reverse Polarity Output Current Limitation Adjustable with only Resistors
CAV414
GENERAL DESCRIPTION
CAV414 universal multipurpose interface capacitive sensors contains complete signal processing unit chip. CAV414 detects relative capacitive change measuring capacity fixed reference capacity. optimised capacities wide range 10pF with possible changes capacity 100% reference capacity. voltage output formed high accuracy instrumentation amplifier combination with operational amplifier. With only external components, CAV414 suitable great variety applications including zero compensation.
APPLICATIONS
Industrial Process Control Distance Measurement Pressure Measurement Humidity Measurement Level Control
DELIVERY
DIL16 packages (samples) SO16(n) packages Dice blue foil
BLOCK DIAGRAM
COSC
Reference Oscillator
CAV414
Integrator Integrator
Signal Conditioning
VOUT
GAIN
Voltage/Current Reference
VREF
Figure
LPOUT
RCX1 RCX2 RCOSC
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
January 2001 Rev.
Converter Capacitive Signals
ELECTRICAL SPECIFICATIONS
Tamb 25°C, 24V, IREF (unless otherwise noted)
Parameter Supply Supply Voltage Quiescent Current Temperature Specifications Operating Storage Junction Thermal Resistance Oscillator Current Reference Oscillator Oscillator Capacitor Range Oscillator Frequency Range Oscillator Current Capacitive Integrator Capacitor Range Capacitive Integrator Current Capacitor Detection Sensitivity Capacitor Range Capacitive Integrator Current Detection Frequency Lowpass Adjustable Gain Output Voltage Corner Frequency Corner Frequency Resistive Load LPOUT Capacitive Load LPOUT Temperature Coefficient VDIFF (together with Input Stages) Internal Resistor Temperature Coefficient R01,02 Power Supply Rejection Ratio (together with Input Stages) Voltage Reference VREF Voltage Current VREF Temperature Line Regulation VREF IREF dVREF dVREF dVREF Load Regulation dVREF dVREF Load Capacitance CREF IREF Tamb -40.+85°C 6V.35V 6V.35V, IREF 4.75 0.05 0.06 VLPOUT RLOAD CLOAD dVDIFF R01, dR01,02 PSRR Tamb 85°C IOUT VDIFF VLPOUT Tamb 85°C ±100 20k, =1nF 20k, =1nF -0.4 fDET RCX1 400k (CX2 )/CX1 RCX2 400k =1nF 4.75 10.5 4.75 COSC fOSC IOSC ROSC 200k COSC Tamb DIL16 plastic package SO16 plastic package Tamb 85°C, IREF 1.55 Symbol Conditions Min. Typ.
CAV414
Max.
Unit
°C/W °C/W
1800 10.75
1000 5.38 2000 5.38
+0.4 ppm/°C 10-3/°C
5.25 ±140 0.10 0.15
ppm/°C ppm/V ppm/V %/mA %/mA
analog microelectronics
January 2001
Converter Capacitive Signals
Parameter Voltage Reference Voltage Temperature Current Load Capacitance Instrumentation Amplifier Input Stage Internal Gain Differential Range Common Mode Input Range CMIR CMIR Common Mode Rejection Ratio Power Supply Rejection Ratio Offset Voltage Temperature Output Stage Adjustable Gain Input Range Power Supply Rejection Ratio Offset Voltage Temperature Input Bias Current Temperature Output Voltage Range PSRR dVOS VOUT VOUT Output Current Limitation Output Current Load Resistance Load Capacitance Protection Functions Protection Against Reverse Polarity Ground VOUT ILIM IOUT IOUT ±0.5 CMRR PSRR dVOS IOUT ±1.5 Tamb -40.+85°C Source Sink 1.90 Symbol Conditions Min. Typ.
CAV414
Max. Unit
2.15
ppm/°C
µV/°C
ILIM
µV/°C pA/°C
Note: oscillator capacity chosen following way: COSC capacitor range extended whereby system performance reduced electrical limits exceeded. Currents flowing into negative.
analog microelectronics
January 2001
Converter Capacitive Signals
BOUNDARY CONDITIONS
Parameter Current Definition Ref. Oscillator Current Adjustment Cap. Integrator Current Adjustment Cap. Integrator Lowpass Stage Resistor Output Stage Resistor Reference Voltage Reference Voltage (only internal use) Lowpass Capacitance Lowpass Capacitance Oscillator Capacitance Symbol RCOSC RCX1 RCX2 CREF COSC Min. 100CX1 100CX1 COSC =1.55CX1 200CX1 200CX1 COSC =1.60CX1 Typ.
CAV414
Max.
Unit
COSC =1.65CX1
Note: system performance over temperature forces that resistors RCX1, RCX2 ROSC have same temperature coefficient very close placement them circuit. capacities CX1, COSC also forced have same temperature coefficient very close placement them circuit.
FUNCTIONAL DIAGRAM
COSC
Reference Oscillator VCX1 VCX2
CAV414
VLPOUT
VDIFF
Integrator Integrator
Signal Conditioning CX,DIFF
Voltage/Current Reference
CREF
RCX1
RCX2
ROSC
Figure
analog microelectronics
January 2001
Converter Capacitive Signals
FUNCTIONAL DESCRIPTION
CAV414
reference oscillator with frequency adjusted capacity COSC drives symmetrically built integrators synchronously clock phase. capacitors determine amplitude driven integrators. difference integrator amplitudes gives relative change capacities each other with high common mode rejection high resolution. difference signal conditioned lowpass filter. corner frequency gain adjusted with external components. output lowpass filter connected instrumentation amplifier output stage. These stages transform signal into adjustable voltage. Adjustment: zero-adjustment made resistors RCX1 RCX2 case that varying capacitance nearly same (and smallest) value fixed capacitance (reference capacitance). Therefore this resistors varied until differential voltage VDIFF VLPOUT zero: VDIFF Application Example: following values given: fixed capacitance CX1: varying capacitance CX2: Calculation: With equations given boundary conditions, following values devices calculated: COSC: CL1: CL2: 80pF 10nF 10nF 50pF 100pF
signal VDIFF amplified, fulfil unequation: VDIFF 400mV Detailed calculations shown separately available Application Note.
analog microelectronics
January 2001
Converter Capacitive Signals
PINOUT
NAME RCOSC RCX1 RCX2 LPOUT GAIN VOUT VREF COSC
CAV414
DESIGNATION Current Definition Ref. Oscillator Current Adjustment Cap. Integrator Current Adjustment Cap. Integrator Gain Adjustment Lowpass Filter Output Lowpass Filter Reference Voltage Gain Adjustment Voltage Output Supply Voltage Ground Reference Voltage Capacitor Reference Oscillator Corner Frequency Lowpass Integrator Capacitor Corner Frequency Lowpass Integrator Capacitor
RCOSC RCX1 RCX2 LPOUT GAIN VOUT
COSC VREF
Figure
DELIVERY
CAV414 available version: 16-Pin-DIL (samples) (Maximum Power Dissipation 300mW) Dice blue foil
PACKAGE DIMENSIONS SO16
10,06 1,45 0,05 0,42 0,07 1,27 0,635 0°-10°
2,00
Figure
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
January 2001

Wide Supply Voltage Range: 6.35V Wide Operating Temperature Range: -40

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