CAV424 - C/U transducer IC with adjustable output voltage PRINCIPLE FUNCTION Capacitance/Voltage converter IC with an adjustable, differential output, integrated temperature sensor VCC = 5V + 5% Measurement capacitance (0...0,5 pF bis 0...1 nF) Reference capacitance (10 pF ... 1 nF) CAV424 VOUT = 1,1 ... 3,9 V Temperature 8mV / K Typical applications CAV424 is an analog linear transducer. The IC is suitable for all capacitive measurements which require a voltage output signal which is proportional to the change in the capacitance to be measured. It can be used for: ! ! ! ! ! ! Distance measurement Pressure sensing Humidity measurement Level sensing Measurement of strength As a capacity input circuit for microprocessors or as a stand-alone device Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 1/16 CAV424 - C/U transducer IC with adjustable output voltage CONTENTS PRINCIPLE FUNCTION 1 CONTENTS 2 FEATURES 3 GENERAL DESCRIPTION 3 BLOCK DIAGRAMM 3 PRINCIPLE OF MEASUREMENT 4 HOW CAV424 WORKS 4 Oscillator function Capacitive integrators Signal conditioning 5 5 7 STANDARD DIMENSIONING 10 BOUNDARY CONDITIONS 10 DIMENSIONING PROCEDURE 10 INITIAL OPERATION 10 OUTPUT VOLTAGES 10 EXAMPLE APPLICATIONS 10 Application: EMC protection for CAV424 10 BLOCK DIAGRAM AND PINOUT 10 DELIVERY 10 ADDITIONAL EQUIPMENT 10 FURTHER READING 10 Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 2/16 CAV424 - C/U transducer IC with adjustable output voltage FEATURES GENERAL DESCRIPTION ! High detection sensitivity ! Wide capacitor measuring range: 5% – 100% relative to the reference capacitor, 0.5pF to 1nF. ! Detection frequency of up to 2kHz ! Adjustable output offset ! Adjustable full scale output signal ! Differential output ! High voltage immunity ! Temperature output signal ! Wide temperature range: -40°C...+105°C ! Supply voltage: 5V ± 5% ! Ratiometric output voltage ! Simple calibration (Excel program) ! RoHS compliant CAV424 is an integrated C/V converter circuit which contains full signal conditioning electronics for almost any source of capacitive signal. For measurement capacitor CM CAV424 detects the relative change in capacitance !CM = CM,max– CM,min in relation to that of a given, fixed reference capacitor CR. The IC has been optimized for reference capacitors of between 10pF and 1nF where the change in capacitance !CM can be 5% to 100% of the basic capacitance CM,min. The differential voltage output has been specially designed for connection to an A/D converter. Together with the integrated temperature sensor and a processor calibratable systems can be assembled. A simple Excel program simplifies the dimensioning of CAV424. BLOCK DIAGRAMM VTEMP RCR RCM RCOSC 7 2 3 1 CAV424 11 VCC T Sensor Current reference COSC CR CM 12 Reference oscillator 16 Integrator 1 14 Integrator 2 6 VM Signal conditioning 5 10 GND 15 CL1 13 LPOUT 4 CL2 RL Figure 1: Block diagram CAV424 Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 3/16 CAV424 - C/U transducer IC with adjustable output voltage PRINCIPLE OF MEASUREMENT CAV424 is an integrated C/U converter circuit which contains full signal conditioning electronics for capacitive signal sources. VCC IM IR CAV424 UOUT CM CR Current sources IM and IR are integrated in CAV424 Figure 2: Principle of capacitance measurement using CAV424 The principle of measurement with the CAV424 entails recording a change in capacitance in a sensor bridge comprising two adjustable current sources and two capacitors, the measurement capacitance (CM) of which can be altered by the amount !CM = CM,max– CM,min. The second capacitor is defined as a reference (CR, see Figure 2). CM,min is the basic capacitance of CM. The change in measurement capacitance is compared to the fixed reference capacitance CR and the resulting signal converted into an output voltage signal. HOW CAV424 WORKS The CAV424 IC functions according to the following principle. An adjustable oscillator, the frequency of which is set using capacitor COSC, drives two symmetrical integrators which are phaselocked and clock-synchronized (see Figure 3). The amplitudes of the two driven integrators are determined by capacitors CR and CM. With high common-mode rejection and a high resolution, the difference between the two amplitudes produces a signal which corresponds to the difference in capacitance between CR and CM (rectifier effect). This difference signal is then filtered in an ensuing active low pass. The resulting voltage signal passes on to an adjustable amplifier stage which sets the output signal to the required value. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 4/16 CAV424 - C/U transducer IC with adjustable output voltage If capacitors CM and CR are the same, following rectification and filtering (see Figure 5) a DCvoltage signal is generated with a value of 0. Should CM change (measurement capacitor), a DCvoltage signal is produced which is proportional to !CM . If CM and CR are not the same, when !CM = 0 an offset would be generated at the output which is superimposed onto the actual direct voltage signal. Oscillator function The integrated oscillator charges up and then discharges the external oscillator capacitor COSC (see Figure 3). The oscillator current IOSC is determined by external resistor ROSC and reference voltage VM: I OSC " VM ROSC (1) The oscillator frequency fOSC is calculated as: f OSC " I OSC 2 # $VOSC # COSC (2) VOSC VOSC,HIGH VOSC (2) VOSC,LOW where $VOSC is the difference between the thresholds of the internal oscillator time t T (VOSC,HIGH and VOSC,LOW). $VOSC is T 2T 2 defined via internal resistors in the IC and has a value of 2.1V @ VCC = 5V (see Figure 3: Oscillator voltage curve Figure 3). The oscillator frequency can thus be specified by the choice of ROSC and COSC; the relevant maximum and minimum values are given in Table 1. Capacitive integrators The built-in capacitive integrators function works in the same way as the oscillator. One difference lies in the discharge time, which here is half the length of the charge-up period. Furthermore, the minimum oscillator voltage for the integrators is internally clamped to a value of VCLAMP = 1.2 V (see Figure 4). Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 5/16 CAV424 - C/U transducer IC with adjustable output voltage VOSC CR < CM ICR = ICM VCLAMP VCR VCM T 2 T 2T time t Figure 4: Integrator oscillator voltage The capacitive integrator currents ICR and ICM are set by external resistors RCM , RCR and reference voltage VM: V V (3)*, (4)* I CM " M and I CR " M RCM RCR Capacitors CM and CR are charged up to a maximum voltage of VCM and VCR respectively and can be calculated as follows: I CM VCM " % VCLAMP (5) 2 # f OSC # C M VCR " I CR 2 # f OSC # C R % VCLAMP (6) The two voltages VCM and VCR are subtracted from one another in the circuit's signal conditioning unit. Via this subtraction, which is tantamount to a rectification of the procedure, VCLAMP is eliminated and a direct voltage of VTPAS is produced as an output signal after filtering. Should ICR and ICM be the same for CM,min (i.e. should the reference capacitance be the same as the basic value of the measurement capacitance), on subtraction and filtering at the signal conditioning output a value of zero is obtained (see Figure 5). * The equations apply to RCX = 0 (see Figures 7 and 8). Should RCX "0 for the resistor due to better thermal coupling, alternative calculations are provided in the Excel spreadsheets Kali1_cav424.exc and Kali2_cavV424.xls. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 6/16 CAV424 - C/U transducer IC with adjustable output voltage VTEMP 7 CAV424 RCR RCM RCOSC 3 2 1 11 VCC T Sensor Current reference COSC 12 CR CM Referenceoszillator 6 VM Integrator 1 16 14 Signal conditioning Integrator 2 5 LPOUT 10 GND 15 CL1 13 CL2 4 RL Figure 5: Block diagram and signal pattern Signal conditioning The filtered and smoothed voltage has a value of VTPAS: 3 VTPAS " # &VCR ( VCM ' 8 (7) Signal VTPAS can be boosted using the follow-on internal operational amplifier, with the amplification GLP being determined by resistors RL1 and RL2. GLP is calculated as: R GLP " 1 % L1 (8) RL 2 With (7), this results in: 3 V DIFF " G LP # VTPAS " G LP # # &VCR ( VCM ' 8 For the output signal reference to ground (GND) it thus follows that: VLPOUT " VDIFF % VM (9) VLPOUT = f(CM, (CR), fosc, ICM, ICR), where the basic values of CM and CR must be placed in a fixed ratio. fosc or ICM, ICR act as parameters. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 7/16 CAV424 - C/U transducer IC with adjustable output voltage The overall transfer function (9) is accrued from equations (5) and (6). It becomes evident that the output signal is a function of capacitors CM and CR, of oscillator frequency fOSC and of the integrator charging currents ICM and ICR. U LPOUT VM 2,5V CM CM CM Max CM Min Figure 6: Output signal VLPOUT with CM > CR referenced to ground A voltage is provided (9) as an output variable which is relative to the average voltage VM. As this is ratiometric to the supply voltage, in effect a differential ratiometric output signal is obtained. ROSC RCM RCX RCR 7 CAV424 2 1 3 VCC 11 T Sensor Current reference 12 Reference oscillator 16 Integrator 1 14 Integrator 2 COSC CR CM VM 6 CVM Signal conditioning VLPout 5 10 13 15 CL 1 CL2 RL1 4 RL3 VDIFF CRL1 RL2 RA RB GND Figure 7: Functional diagram for CAV424 (with charging currents ICM and ICR constant) Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 8/16 CAV424 - C/U transducer IC with adjustable output voltage Figure 7 assumes that the charging currents ICM and ICR are constant. This means that with a change in the basic value of the measurement capacitance CM,min (as is the case when different objects are measured, for example) the oscillator frequency must be adjusted to the new measurement with the alternate CM,min value. If oscillator frequency fosc is to be set as a parameter, when CM,min is altered the two values ICM and ICR must also be adjusted. It is recommended that ICM = ICR. Both procedures are equally effective; the choice thereof depends on the conditions stipulated by the application. A functional diagram is shown in Figure 8. ROSC RCX RCM RCR 7 CAV424 2 1 3 VCC 11 T Sensor Current reference 12 Reference oscillator 16 Integrator 1 14 Integrator 2 COSC CR CM VM 6 CVM Signal conditioning VLPout 5 10 13 15 CL 1 CL2 RL1 4 RL3 VDIFF CRL1 RL2 RA RB GND Figure 8: Functional diagram for CAV424 (with fosc constant) If fosc = constant and ICM, ICR = f(CM, CR) the same equations (1 to 9) apply as for the case that ICM and ICR = constant and fosc = f(CM, CR). For dynamic measurements with periodically changeable measurement capacitances the various frequencies must be taken into account. Among other things, the following applies: f det << f osc fdet is the detection frequency which gives the change in measurement capacity per unit of time. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 9/16 CAV424 - C/U transducer IC with adjustable output voltage ELECTRICAL SPECIFICATIONS Tamb = 25°C, VCC = 5V (unless otherwise stated) Parameter Symbol Conditions Min. Typ. Max. Unit Supply Supply Voltage VCC Ratiometric range 4.75 5.00 5.25 V Quiescent Current ICC Tamb = -40 ... 105°C, GLP = 1 0.6 1.0 1.4 mA Temperature Specifications Operating Tamb -40 105 °C Storage Tst -55 125 °C COSC = 1.6 # CM 16 1600 pF ROSC = 250k) 9.5 Oscillator Oscillator Capacitor Range COSC Oscillator Frequency Range fOSC Oscillator Current IOSC 1 10 130 kHz 10.75 *A 1000 pF 5.38 *A Capacitive Integrator 1 and 2 10 Reference Capacitor Range CR Reference Capacitive Integrator Current IR RCR = 500k) Measurement Capacitor Sensitivity $ CM $CM = (CM,max(CM,min )/CM,min 5 100 % Measurement Capacitor Range CM CM,min ! CM ! CM,max 10 2000 pF Measurement Capacitor Integrator Current IM RCM = 500k) 5.38 *A Detection Frequency fDET CL1 = CL2 =1nF 2 kHz 4.75 4.75 5 5 Low Pass Stage Adjustable Gain GLP Output Voltage VLPOUT VLPout = VDiff + VM , Corner Frequency 1 fC1 R01 = 20k), CL1 =1nF Corner Frequency 2 fC2 R02 = 20k), CL2 =1nF Resistive Load at PIN LPOUT RLOAD Capacitive Load at PIN LPOUT CLOAD Output voltage shift VDIFF Temperature Coefficient VDIFF (together with Input Stages) dVDIFF /dT Internal Resistor 1 and 2 R01, R02 Temperature Coefficient R01,02 dR01,02 /dT RAT@VDIFF* Tamb = -40 ... 105°C VM VM vs. Temperature Current IVM Ratiometric Error of VLPOUT 1 10 1.1 VCC – 1.1 V 8 kHz 8 kHz 200 k) 50 VM = 2.5V -1.4 1.4 +100 Tamb = -40 ... 105°C pF V ppm/°C 20 k) 1.9 10-3/°C 0.11 %FS Ratiometric to VCC 2.5 V dVM /dT Tamb = -40...+105°C +20 +50 ppm/°C IVM Source 16 *A Sink -16 *A Voltage Reference VM Voltage Load Capacitance CVM Ratiometric Error of VM RAT@VM** 80 100 0.007 120 nF %FS * RAT @ VDIFF = 2 [1.05 VDIFF(VCC = 5V) – VDIFF(VCC = 5.25V)]/[VDIFF(VCC = 5V) + VDIFF(VCC = 5.25V)] ** RAT @ VM = 2 [1.05 VM(VCC = 5V) – VM(VCC = 5.25V)]/[VM(VCC = 5V) + VM(VCC = 5.25V)] Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 10/16 CAV424 - C/U transducer IC with adjustable output voltage Parameter Symbol Conditions Min. Typ. Max. Unit 2.20 2.32 2.45 V Temperature Sensor VTEMP RTEMP , 50M) Voltage VTEMP Sensitivity dVTEMP/dT RTEMP , 50M) RTEMP , 50M), end point method Thermal Nonlinearity 8 mV/°C 0.5 %FS Table 1: Specifications for CAV424 Note: 1) The oscillator capacity has to be chosen using COSC = 1.6 # CM,Min 2) The capacitor range of CM and CR can be extended, whereby the system performance is reduced and the electrical limits are exceeded. 3) Currents flowing into the IC are negative. 4) RTEMP is the minimum load resistance at pin VTEMP. The system performance over temperature forces resistors RCR, RCM and ROSC to have the same temperature coefficient; this also requires that the components are placed very close together in the circuit. Capacitors CR, CM and COSC are also obliged to have the same temperature coefficient and a very close proximity on the circuit board. STANDARD DIMENSIONING For external elements which do not have to be altered dependent on the measurement capacity the following standard values apply: Parameter Symbol Min. Typ. Output Stage Resistor (1%) RL2 , RL3 100 Offset Resistor (1%) RB 100 Reference Voltage Capacity (VM = 2.5V) CVM Filter Capacitance CRL1 80 Max. Unit k) k) 100 120 nF 2.2 nF Table 2: Standard values for external components BOUNDARY CONDITIONS Symbol Parameter Condition Min. Typ. Max. Unit 17 V 130 kHz Maximum Supply Voltage VCCmax Oscillator Frequency Range fOSC Reference Capacitive Integrator Current IR RCR = 500k) 5.38 *A Measurement Capacitor Integrator Current IM RCM = 500k) 5.38 *A 1 Table 3: Boundary conditions Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 11/16 CAV424 - C/U transducer IC with adjustable output voltage DIMENSIONING PROCEDURE Programs Kali1_cav424.xls and Kali2_cav424.xls can be used for dimensioning purposes. The dimensioning process takes the following scenarios into account: a) Kali1_cav424.xls – The integrator charging currents ICM and ICR are given and constant. Oscillator frequency fosc must be adjusted to suit the minimum value of measurement capacitance CM,min. b) Kali2_cav424.xls – Oscillator frequency fosc is given and determined and integrator charging currents ICM and ICR must be adjusted to suit the minimum value of measurement capacitance CM,min. In a) the dimensioning process assumes that in addition to measurement capacitors CM and CR parasitic capacitances in both the IC and measurement circuit also influence the signal pattern. When dimensioning on the basis of the given equations a deviation from the theoretical value in the output characteristic must thus be reckoned with. For this reason a calibration algorithm has been developed (Kali1_cav424.xls) which at constant integrator charging currents (ICM and ICR) calculates a suitable oscillator frequency of fosz depending on the minimum value of CM,min (basic capacitance). It then dimensions the resistors for the offset and signal span in such a way that the output signal adopts the required values. Compensation of the sensor system is carried out in two stages. In stage one a calibration operating point is defined, during which process oscillator frequency fosc is calculated depending on minimum measurement capacitance CM,min. To this end the minimum and maximum values (CM,min and CM,max) are entered in the Excel spreadsheet. The oscillator frequency, oscillator capacitance COSC and oscillator resistance ROSC are then output. In addition low pass filter capacitances CL1 and CL2 are calculated which are dependent on the oscillator frequency. It is sufficient if these values are computed once for the largest expected value of minimum basic capacitance CM,min (for example during one production batch) and the relevant capacitors added to the circuit. The maximum signal frequency is also determined by which the measurement capacitance is permitted to change. Taking the given and calculated external components and particularly predefined precision resistors RL1(mess) and RL2(mess) we can calculate the output voltage VLPOUT(mess). NB: RL1(mess) and RA(mess) must both be 100kOhm precision resistors with a tolerance of 0.1% maximum. Output signal values VLPOUT(mess) are now entered in stage two of the calibration program. Using the measured values the algorithm now calculates the setpoint for the two calibration resistors RL1 and RA which replace precision resistors RL1(mess) and RL2(mess) and must be individually mounted. Depending on the accuracy requirements of the setup their values should match those calculated as closely as possible. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 12/16 CAV424 - C/U transducer IC with adjustable output voltage Once the two calibration resistors RL1 and RA have been replaced by precision resistors RL1(mess) and RL2(mess) the system is calibrated to the required output value – with all parasitic effects and tolerances taken into account. In stage one of b), at a given fixed oscillator frequency calibration spreadsheet Kali2_cav424.xls calculates the values of integration currents ICM and ICR which can be achieved by setting resistors RCM and RCR. Using these values and the other external elements output voltage VLPOUT(mess) is measured and the value entered into the calibration program. The rest of stage two is identical to the calibration procedure described in a). INITIAL OPERATION Initial operation is described in detail in the description of the calibration program (see Kali1_cav424.xls and Kali2_cav424.xls). OUTPUT VOLTAGES The following applies for the output voltage (9): VLPOUT " VDIFF % VM V (Volt) VCC 5 4 VLP O UT , max +Vdiff 2,5 -Vdiff 1 VM VLP O UT , min 0 Figure 9: Output voltages If VM = 2.5V, according to the specifications the schematic shown in Figure 9 is generated. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 13/16 CAV424 - C/U transducer IC with adjustable output voltage EXAMPLE APPLICATIONS Application: EMC protection for CAV424 VTEMP 7 CAV424 RCX1 RCX2 RCOSC 2 3 1 11 VCC T Sensor COSC CR Stromreferenz 12 ReferenzOszillator 16 Integrator 1 6 VM Signalverarbeitung CM CR REMVM 5 LPOUT 100mV REMVR 100mV 14 CM Figure 10: Protective EMC circuitry for CAV 424 When measuring capacitance the electrodes are receptive to high-frequency disturbances such as aerials. Measures must thus be taken to protect these high impedance inputs. To protect against EMC resistors REMVM and REMVR are plugged into the supply lines servicing external capacitors CM and CR. Together with the parasitic and internal capacitances these act as low passes and thus suppress high-frequency disturbance factors. The following applies: REMVM " 0.1V 0.1V and REMVR " I CM I CR Further protective EMC measures are not required for industrial applications. As CAV424 has been manufactured using bipolar technology the IC is robust with regard to ESD. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 14/16 CAV424 - C/U transducer IC with adjustable output voltage BLOCK DIAGRAM AND PINOUT VTEMP RCR RCM RCOSC 7 2 3 1 CAV424 11 T Sensor COSC CR CM 12 Reference oscillator 16 Integrator 1 14 Integrator 2 VCC Current reference 6 VM Signal conditioning 5 10 15 GND CL1 13 LPOUT 4 CL2 RL Figure 11: Block diagram of CAV424 PIN NAME DESCRIPTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 RCOSC RCR RCM RL LPOUT VM VTEMP N.C. N.C. GND VCC COSC CL2 CM CL1 CR Oscillator current definition Current setting for integrator CR Current setting for integrator CM Gain setting Output Reference voltage 2.5V Temperature sensor Not connected Not connected IC ground Supply voltage Oscillator capacitance Low pass 2, corner frequency Measurement capacitance Low pass 1, corner frequency Reference capacitance RCOSC RCR RCM RL LPOUT VM VTEMP N.C. 1 2 3 4 5 6 7 8 16 15 14 13 12 11 10 9 CR CL1 CM CL2 COSC VCC GND N.C. Figure 12: CAV424 pinout Table 4: CAV424 pinout Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 15/16 CAV424 - C/U transducer IC with adjustable output voltage DELIVERY CAV424 is available as: ! SO16 (n) ! Dice on 5" blue foil ! For sample batches CAV424 can be supplied on a DIL16 SO16 adapter (CAV424Adapt) Package dimensions: see http://www.analogmicro.de/products/analogmicro.de.en.package.pdf ADDITIONAL EQUIPMENT For design purposes, by way of support Analog Microelectronics GmbH can also supply a breadboard (BBCAV424) which has been assembled for a set of parameters but which can also be used for individual measurements. FURTHER READING Please see our website for further information (www.analogmicro.de): [1] AN1008 application notes [2] PR1009 press release AMSYS reserves the right to amend any dimensions, technical data or other information contained herein without prior notification. Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz Phone: +49 (0)6131/91 073-0 Fax: +49 (0)6131/91 073-30 Internet: http://www.analogmicro.de Email: [email protected] July 2007 - Rev 1.2 - Page 16/16