CAV424

CAV424 ANALOGMICRO | Alldatasheet

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C/V-converter for single and differential capacitive input signals Analog Microelectronics GmbH An der Fahrt 13, D – 55124 Mainz July 2014 – Rev. 3.0 Phone:+49 (0)6131/91 0730-0 Fax: +49 (0)6131/91 073-30 Internet: www.analogmicro.de E–Mail: info@analogmicro.de Principle Function Capacitance/Voltage-converter IC with adjustable voltage output and integrated temperature sensor Function CAV424 is an integrated capacitance-to-voltage conv erter. The IC measures the capacitance of a connected capacitive measurement head against a ref erence capacitance and converts the differ- ence into a DC output voltage. CAV424 can be used as analog front end for a micro processor or as stand-alone IC. Typical Applications

• Humidity measurement
• Distance measurement
• Suitable for capacitive pressure sensors
• Level sensing
• Material identification
• Object detection

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 3/14 www.analogmicro.de

FEATURES

• large measurement capacitance range: 5 pF up to 40 nF
• suitable for single and differential capaci- tive sensor heads
• high detection sensitivity
• ratiometric voltage output
• adjustable offset and gain
• fast response time
• integrated temperature sensor
• supply voltage 5V ± 5%
• large temperature range: –40°C...+105°C
• easy-to-use calibration procedure (Excel- sheet)
• available in SO16 or as Die
• RoHS conform GENERAL DESCRIPTION CAV424 is an integrated C/V-converter suitable for the capacitance measurement in single or differential capacitive sensor systems. Its output voltage is a linear function of the reciprocal meas - urement capacitance and it is ratiometric to the supply voltage. The IC is completely analog leading to a fast re- sponse time and a resolution only limited by the signal to noise ratio. CAV424 provides the complete electronics needed for the conversion of single or differential capactive input signals into voltage output signals , which can be an amplified and offset adjusted using external trimming resistors. The IC can be used as stand-alone analog signal- processing IC or as front-end for a micro proces- sor for electronically calibratable sensor systems. An Excel-sheet simplifies the external compo- nent’s dimensioning as well as the trimming of complete sensor systems. BLOCK DIAGRAM Figure 1: CAV424's block diagram

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 4/14 www.analogmicro.de SPECIFICATIONS 1. Electric Specifications Tamb = 25°C , VCC = 5V , IOSC = 20µA , ICR = I CM = 2.5µA (unless otherwise noted) Parameter Symbol Conditions Min. Typ. Max. Unit System Operating Temperature Tamb -40 105 °C Supply Voltage VCC ratiometric range 4.75 5.00 5.25 V Current consumption ICC Tamb = 25°C, G = 1 1.3 mA Tamb = -40 .. 105°C, I CR = I CM = 25 µ A 1.7 Measurement Capacitance 1), 2) CM 5 40000 pF Reference Capacitance Range 2) CR 5 10000 pF Output Voltage 3) VOUT 1.0 4.0 V Differential Output Voltage VDIFF VDIFF = V OUT - V REF -1.5 1.5 V Temperature Coefficient V OUT 4) TC VOUT dV OUT /(dT ·VSPAN ) @ T amb = -40..85°C ±200 ppm/°C Maximum Input Signal Frequency 5) fsig,max @ f OSC = 230 kHz, C F1 = C F2 = 2 nF 3.5 kHz Minimal Response Time 6) tRES,min @ f OSC = 230 kHz, C F1 = C F2 = 2 nF 0.4 ms Oscillator Oscillator Capacitor Range 2) COSC 20 11000 pF Oscillator Frequency Range fOSC fOSC = V REF / (2 ·∆VOSC ·ROSC ·COSC ) 1 240 kHz Oscillator Voltage Amplitude ∆VOSC 2.1 2.15 2.2 V Oscillator Current Resistor ROSC 50 125 k Ω Oscillator Charge Current IOSC IOSC = V REF / R OSC 20 50 µ A Charge Current Spread IOSC,var @ R OSC = 125k Ω 19 20 21 µ A Reference Integrator (for C R) Max. Ref. Integrator Voltage VCR,max @ Pin 16 4.1 V Ref. Integrator Current Resistor RCR 100 1250 k Ω Ref. Integrator Charge Current ICR ICR = V REF /R CR 2 25 µ A Charge Current Spread ICR,var @R CR = 1000k Ω 2.4 2.5 2.6 µ A Measurement Integrator (for C M) Max. Meas. Integrator Voltage VCM,max @ Pin 14 4.1 V Meas. Integrator Current Resistor RCM 100 1250 k Ω Meas. Integrator Charge Current ICM ICM = V REF / R CM 2 25 µ A Charge Current Spread ICM,var @ R CM = 1000 k Ω 2.4 2.5 2.6 µ A Lowpass Stage Internal Resistor 1 and 2 R01 , R 02 20 kΩ Low Pass Filter Capacitors 7) C F1 , C F2 2 500 nF Corner Frequency fC R01 = R02 = 20k Ω , C F1 = CF2 = 2 nF 4 kHz LP-Stage Voltage Input VLP,in 0.8 4.2 V Offset Voltage VLP,ofs between Pin 15 and 13, V LP,in = V REF -2 2 mV

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 5/14 www.analogmicro.de Output Stage Adjustable Gain G 1 Output Current IOUT Source, Sink 8) -100 100 µ A Resistive Load at Pin V OUT RL 40 kΩ Capacitive Load at Pin V OUT CL 100 pF Input Offset Voltage VOFS RL = 100 M Ω -2 2 mV Reference V REF Reference Voltage VREF VREF = V CC / 2 2.49 2.5 2.51 V Temperature Coefficient TC VREF dVREF /(d T·VREF ), Tamb = –40...+105°C ±50 ppm/°C Current IVREF Source, Sink 8) -100 100 µ A Load Capacitance CVREF 80 100 120 nF Temperature Sensor V TEMP Output Voltage VTEMP RTEMP ≥ 50 M Ω 2.20 2.32 2.45 V Sensitivity S S = dV TEMP / dT, RTEMP ≥ 50 M Ω 8 mV/°C Resistive Load RTEMP 10 MΩ Thermal Nonlinearity NL TEMP RTEMP ≥ 50 M Ω , end point meth. 0.5 % Notes: 1) If a small deviation (< 1%) from equation (8) (or ( 11) resp.) is needed, a maximum measurement capacit ance CM,max not larger than ten times the particular minimum measurement capacitance CM,min should be used. 2) The specified value doesn’t include parasitic IC capacitance (typ. 5 pF for SO16(n) package at pin 12, 14 and 16). 3) If VCC ≠ 5 V , the maximum of VOUT is given by 0.8 ·VCC . 4) The temperature coefficient is normalized with V Span = V OUT (C M,max ) - V OUT (C M,min ). 5) The maximum input signal frequency fSIG,max is defined as the measurement capacitance’s change rate, at which the low pass filter reduces the output voltage by 6 dB. 6) The response time is defined as the time until VOUT reaches 99.99% of its final value after a 100 % input step. 7) The typical dimensioning of the low pass capacitors CF1 and CF2 is based on the requirement that a ripple of less than 1‰ remains on the output voltage at the oscill ator frequency. Smaller capacitances can be chosen t o de- crease the response time but lead to a higher ripple. 8) Currents flowing into the IC have a negative sign. 2. Absolute Maximum Values Parameter Symbol Condition Min. Typ. Max. Unit Maximum Supply Voltage VCCmax 6 V Maximum Oscillator Charge Current IOSCmax 50 µ A Max. Meas. Oscillator Charge Current ICMmax 25 µ A Max. Ref. Oscillator Charge Current ICRmax 25 µ A Storage Temperature TStore -55 125 °C ESD Susceptibility VESD HBM 2 kV Notes: 1) ESD Protection on all pins except pin 12, pin 14 an d pin 16. Table 1: CAV424's electric specifications Table 2: Absolute Maximum Values

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 6/14 www.analogmicro.de FUNCTIONAL PRINCIPLE CAV424’s functional principle is described using Figure 2, where the functional blocks of the IC, the signal patterns inside the IC and a basic external circuit with necessary passive components are illustrated. The IC consists of seven functional blocks: the osc illator, the measurement integrator, the reference integra- tor, the low pass filter, the output stage, the tem perature sensor and the power supply. The power sup ply block drives all the other blocks and also generate s a reference voltage of 2.5 V. The temperature sen sor block provides an output voltage VTEMP proportional to the IC’s temperature. The capacita nce measurement path consists of the remaining five blocks and is described below. CAV424 uses a differential measurement principle to evaluate the measurement capacitance CM. Using two symmetric integrator blocks CM is measured against a reference capacitance CR. Both capacitances are charged and discharged synchronously with constant current by their separate integrator blocks. The ch arge currents for CM and CR can be adjusted using RCM and RCR respectively. The time constant for the charge and discharge process is given by the oscillator bl ock, whose frequency can be adjusted using COSC and ROSC . The measurement and the reference integrator both generate a sawtooth output voltage with an ampli- tude proportional to 1/C M and 1/C R respectively. At the low pass stage the difference of these sawtooth out- put voltages is converted into a DC voltage. The ou tput voltage VOUT at pin 5 is ratiometric to the supply volt- age and is a linear function of 1/C M. It can be referenced to GND or to pin 6 to obtain the differential output voltage VDIFF = V OUT – V REF . Using the circuit in Figure 6 the output signal’s offset and gain can be adjusted too. Figure 2: CAV424 with signal path and a basic circuit

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 7/14 www.analogmicro.de FUNCTIONAL DESCRIPTION 1. Oscillator To generate a clock for the integrator blocks, the oscillator block charges and discharges the externa l oscilla- tor capacitance COSC periodically with a constant current given by: OSC REF OSC R VI = (1) where VREF is the reference voltage and ROSC is the oscillator current resistor. The time dependent voltage at the oscillator capaci tance is illustrated in Figure 3. C OSC is charged with I OSC beginning at the oscillator’s lower threshold VOSC,LOW until the upper threshold VOSC,HIGH is reached. Then the current’s direction is reversed and COSC is discharged until the lower threshold is reached again. This leads to a triangular voltage signal at COSC with the frequency fOSC : OSC OSC OSC OSC OSC OSC CRCV 5 . 2 2 (2) with ∆VOSC = 2.1 V and VREF = 2.5 V (@ VCC = 5 V ). 2. Measurement and Reference Integrators The measurement and reference integrator blocks are the core part of the measurement path. At these symmetrically built integrators the connected capac itances’ values are converted into a voltage signal . Both integrators are driven by the oscillator block and charge and discharge the connected capacitances wit h constant current. As illustrated in Figure 4, for half a period the measurement capacitance C M is charged with ICM and the ref- erence capacitance CR is charged with ICR , which are given by CM REF CM R VI = and CR REF CR R VI = (3) where RCM and RCR are the measurement and reference integrator curre nt resistors. The capacitances CM and CR are charged to a maximum voltage of VCM and VCR respectively, which can be calculated as follows: CLAMP MOSC CM CM VCf IV +⋅⋅= 2 and CLAMP ROSC CR CR VCf IV +⋅⋅= 2 (4) with VCLAMP = 1.2 V , which is the minimum integrator voltage. Figure 3: Oscillator voltage signal over time

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 8/14 www.analogmicro.de Then for the next quarter of a period the capacitan ces C M and CR are discharged with twice the charge cur- rent ( 2·ICM and 2·ICR ) until VCLAMP is reached. VCLAMP is held for the last quarter of the period. Afterw ards this cycle starts again. 3. Signal Processing Unit (Low Pass Filter and Output Stage) To generate a single voltage from the measurement a nd reference integrator voltage signals, VCM and VCR are subtracted from each other and VREF is added. The resulting maximum voltage at the low pass stage’s input is given by: ( ) REF MCM RCR OSC REF REF CM CR in LP VCRCRf VVVVV + max , (5) This voltage is integrated and averaged by the low pass filter block, which consists of two passive fi rst order low pass RC-networks decoupled by an operational am plifier. The filter resistors R01 = R 02 = 20 k Ω are im- plemented in CAV424 and the filter capacitors CF1 and CF2 , which are external components, define the cor- ner frequency fC: Filter C Ckf ⋅ Ω⋅= 20 2 π with CFilter = C F1 or CF2 . (6) Typically the filter capacitors are chosen in such a way that C F1 = C F2 and fC = 10 ·fOSC , leading to a ripple smaller than 1 ‰ of the output signal. The DC volta ge at low pass filter’s output is given by: ( ) REF MCM RCR OSC OSC OSC REF CM CR DC LP VCRCRVCRVVVV + 3 (7) Using the circuit in Figure 2 this DC voltage is impedance transformed by the ou tput stage. For this case the output voltage VOUT at pin 5 is given by equation (8). The DC voltage can be amplified and offset adjusted using the circuit in Figure 6. For that case the output voltage VOUT at pin 5 is given by equation (11). Figure 4: Measurement and reference i ntegrator voltage signal s over time

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 9/14 www.analogmicro.de

APPLICATION INFORMATION

1. Transfer Function For the capacitive sensor system shown in Figure 2 the output voltage VOUT at pin 5, which is referenced to GND, is given by: REF MCM RCR OSC OSC OSC MOUT VCRCRRCVCV + ⋅⋅∆ ⋅= 11 3)( (8) with C M = variable measurement capacitance CR = reference capacitance COSC = oscillator capacitance RCM = measurement integrator current resistor RCR = reference integrator current resistor ROSC = oscillator current resistor ∆VOSC = voltage amplitude at the oscillator (with ∆VOSC = 2.15 V @ V CC = 5 V ) VREF = reference voltage (V REF = 2.5 V @ V CC = 5 V ) Using equation (8) it is easy to see that the outpu t voltage is a linear function of the reciprocal me asurement capacitance 1/CM. The following relationships can be used to reduce the number of parameters and to en- sure that CAV424 works properly:1 min ,MCM RCR CRCR ⋅=⋅ and min ,55 . 0 M OSC CM OSC CR RC ⋅⋅= (9) wherein CM,min is the specific minimum measurement capacitance of the measurement setup. Inserting (9) into (8) leads to the following easy transfer function, REF M M MOUT VC CCV + −⋅= min , 144 . 0)( . (10) wherein VOUT only depends on CM,min and CM. Equation (10) is illustrated in Figure 5 for the measurement range ∆CM = C M,max – C M,min , wherein CM,max is the specific maximum measurement capacitance of the measurement setup. For CM = C M,min equation (10) leads to VOUT (C M,min ) = V REF . 1 For an optimal and easy dimensioning of the external passive components Analog Microelectronics has developed the Excel-sheet, Kali_CAV424 (see section “Further Literature”). Figure 5: Output signal V OUT as a function of the measurement capacitance C M

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 10/14 www.analogmicro.de 2. CAV424 used as C/V-converter with adjustable gain and offset For the adjustment of the output signal’s offset an d gain five resistors R1 .. R 5 have to be added to the net- work in Figure 2. The complete measurement circuit with CAV424 is illustrated in Figure 6. For the capacitive measurement system in Figure 6 the output voltage VOUT at pin 5 (referenced to GND) is given by: REF MCM RCR OSC OSC OSC OUT VBCRCRRCVGV ⋅+ 3 (11) with 5 35 44 3 5 45 3

11 RRRRRR

R R R RG ++ +⋅++= and 5 35 44 3 5 45 3 R RB ++ −⋅+= . (12) wherein R2, R4 and R5 are fixed resistors, R1 is the trimming resistor for the adjustment of gain and R3 is the trimming resistor for the adjustment of offset. Using the equations (11) and (12) it is easy to see that the output voltage is again a linear function of the reciprocal measurement capacitance 1/CM. Inserting (9) into (11) leads to the following easy transfer function, REF M M MOUT VBC CGCV ⋅+ −⋅ ⋅= min , 144 . 0)( . (13) wherein VOUT only depends on CM,min and CM. Figure 6: CAV444 used as C/V-converter with adjustable gain and offset

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 11/14 www.analogmicro.de 3. Standard Dimensioning A basic dimensioning of the passive external compon ents in Figure 6 with a measurement capacitance not larger than 1 nF is given in the table below. For t he application specific capacitance ranges or if CR is given by the measurement setup an optimal dimensioning can be calculated using the Excel-sheet Kali_CAV424. Notes: 1) The optimal value of CF1 and CF2 depends on the oscillator frequency. The given val ue can be used for CM,min from 5 pF to 1000 pF, but leads to a slow response time. 2) R1 = R3 = 100 k Ω are used to measure the output voltages at C M,min and C M,max at the start of the trimming proc- ess. During the trimming process R1 and R3 will be set to individual values (calculated by th e Excel-sheet Kali_CAV424). 3) For best performance a high grade ceramic capaci tor has to be used for CVREF . 4) Usually it is sufficient to use standard compone nts with low temperature coefficients ( ≤ 100 ppm). For RCM , RCR , ROSC , CVREF and CF1/F2 a variance of 5% of the given values is acceptable without a decrease in performance. For components, which have to have lower variances, the tolerances are given in round brackets in Table 3. 4. Calibration Procedure During the design of capacitive sensor systems it a lways has to be taken into account that there are p arasitic capacitances beside the connected measurement capac itance, which influence the output signal and the calibration process. To simplify the consideration of these effects during the calibration of sensor s ystems, Analog Microelectronics developed a calibration str ategy, implemented in the Excel-sheet Kali_CAV424. This Excel-sheet, based on the circuit in Figure 6, is available free of charge at www.analogmicro.de . Using this strategy the calibration of sensor syste ms with CAV424 is done in two steps, a dimensioning and a trimming step. At first a dimensioning of the ext ernal components is calculated for the specific typ e of sen- sor implemented with CAV424. This dimensioning is m ostly dependent on the capacitive measurement range of the sensor. Based on a few input values ch aracterizing the capacitive sensor system the progr am calculates a suitable dimensioning of the remaining external components. After the specific sensor systems have been built w ith the calculated dimensioning a trimming of offse t and gain (using the trimming resistors R1 and R3) of the individual sensor systems has to be done. Therefore the output voltage has to be measured at the minimum an d the maximum measurement capacitance. Based on these values the Excel-sheet calculates the final t rimming resistor values for R1 and R3. After trimming R1 and R3 to the calculated values the sensor is ready for o peration and all parasitic capacitances as well as the tolerances of the used components are taken into account. Parameter Symbol Min. Typ. Max. Unit Reference Capacitor CR CM,min pF Oscillator Capacitor COSC 4.4* CM,min pF Measurement Integrator Current Resistor RCM 1000 kΩ Reference Integrator Current Resistor RCR 1000 kΩ Oscillator Current Resistor ROSC 125 kΩ Low Pass Filter Capacitors 1) CF1 , C F2 500 nF Output Stage Resistor (1%) R2, R 4, R 5 100 kΩ Full-Scale Resistor (0.1%) Calibration Meas. Value 2) R1(start) 100 kΩ Offset Resistor (0.1%) Calibration Meas. Value 2) R3(start) 100 kΩ Reference Voltage Capacitor ( VREF = 2.5V) 3) CVREF 80 100 120 nF Table 3: Standard dimensioning at ICM = I CR = 2.5 µA , IOSC = 20 µA , CM,max < 1 nF, CR = C M,min .

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 12/14 www.analogmicro.de 5. Operation Instructions For first investigations Analog Microelectronics of fers the BBCAV424, a pre-assembled breadboard (see section “Accessories”) with easily adaptable measur ement capacitance ranges, which can be used to stud y the behavior of capacitance sensor heads as well. Capacitive measurement heads with a single capaciti ve output signal have to be connected to pin 14 (CM ). In this case the reference capacitance is typically chosen as a ceramic capacitor with CR = C M,min , where CM,min .is the specific minimum measurement capacitance. If a differential capacitive measurement head with a measurement and an integrated reference capacitan ce is used, a differential measurement can be made by connecting the measurement capacitance to pin 14 (CM) and the reference capacitance to pin 16 (CR). For both cases it is recommended to do the external component’s dimensioning using the Excel-sheet Kali_CAV424. To consider possible production varian ces in the capacitive measurement heads it is recommended to do the dimensioning using the specif ic minimal value of CM,min and the maximal value of CM,max . If a reference capacitance is integrated in the m easurement head, the minimal reference capacitance value should be used for CR as well. To realize the dimensioning, calculated by the Exce l-sheet, networks of not more than two resistors or capacitors should be used. In many applications it is sufficient to use standard components, like e-se ries capacitors, which fit to the calculated values within 5% (see section “Standard Dimensioning”). For the PCB layout it is recommended to keep conduc ting lines from the IC to its external passive components short, leading to small parasitic capaci tances. Furthermore the conducting lines for CM and CR should be routed symmetrically. The parasitic capacitances in the sensor setup enla rge the used capacitances, especially the measureme nt, the reference and the oscillator capacitance and in fluence the capacitance measurement directly. It is important to keep the parasitic capacitances as sma ll and stable as possible. If flexible wiring has to be used, then only shielded wires should be used for CM and CR and the wires should be kept as short as possible. The parasitic capacitances inside the IC have to be considered as well if small capacitances have to b e measured. Typically a parasitic capacitance of 5 pF is added to the connected capacitance at pin 12, 1 4 and 16, when the SO16(n) package is used. CAV424’s differential measurement principle can be used to reduce the susceptibility against electromagnetic disturbances. To use the benefits o f this measurement principle CM and CR should be placed close to each other and their wiring should be kept symmetrical. In real sensor applications the temperature behavio r is mainly influenced by CM’s, CR’s and COSC ’s and further external component’s temperature coefficients ( TCs ). In general an optimal temperature behavior can be achieved by using COSC with a low TC and CM and CR, which have equal TCs. In general ESD precautions are necessary during ass embly and handling of the device. It is essential t o ground machines and personnel properly. Take care that the absolute maximum values in Table 2 are not exceeded, when the device is put into operation. Notes: 1. If the voltage signal at pin 12, 14 or 16 is mea sured using an oscilloscope, the probe’s capacitanc e is added to the capacitance at the specific pin, which changes the output voltage signal. To check the frequency a nd the dif- ferential signal amplitude without influencing the output signal it is possible to remove the low pass filter capacitor CF1 and measure at pin 15. 2. For level sensing applications it is important t o isolate the measurement electrode from a conducti ve medium. Otherwise the output voltage is affected by the medium’s conductivity.

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 13/14 www.analogmicro.de PACKAGE AND PINOUT The CAV424’s standard packaging is a SO16 (n) package (for dimensions please see the packaging catalog DELIVERY FORMS CAV424 is available as: ORDER NUMBER DELIVERY FORM CAV424-0-SO16 CAV424 in an SO16(n) package CAV424-WAF Sawn wafer on 8“ blue foil CAV424-Adapt CAV424 soldered to an SO16-DIL16 adapter ACCESSORIES To support developments using CAV424 Analog Microelectronics GmbH offers the Breadboard BBCAV424. ORDER NUMBER DELIVERY FORM BBCAV424 BBCAV424 – BreadBoard (PCB with CAV424) PIN NAME BESCHREIBUNG

1 RCOSC Oscillator current adjustment

2 RCR Integrator current adjustment for C R

3 RCM Integrator current adjustment for C M

4 GAIN Gain adjustment

5 VOUT Output voltage

6 VREF Reference voltage ca. 2.5V

7 VTEMP Temperature sensor voltage output

8 N.C. Not connected 9 N.C. Not connected

10 GND IC ground

11 VCC Supply voltage

12 COSC Oscillator capacitor

13 CF2 2nd order lowpass capacitor

14 CM Measurement capacitance

15 CF1 1st order lowpass capacitor

16 CR Reference capacitor

Table 4: Pin assignment CAV424 SO16 Package Figure 7: Pinout CAV424 SO16

C/V-converter for single and differential capacitive input signals July 2014 – Rev. 3.0 Page 14/14 www.analogmicro.de FURTHER LITERATURE All documents below are available on the website: www.analogmicro.de 1. Excel-sheet Kali_CAV424 2. Application Notes on CAV424 4. CAV424 – Die Size and Padout (on request) NOTES Analog Microelectronics GmbH reserves the right to amend any dimensions, technical data or other information contained herein without prior notification.