EV0181 CMLMICRO | Alldatasheet
Document overview
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Technical content
Datasheet sections
- 1.0 Features
- 1.1 Brief Description
- 1.2 Preliminary Information
- 1.2.1 Laboratory Equipment
- 1.2.2 Handling Precautions
- 1.2.3 Approvals
- 1.3 Quick Start
- 1.3.1 Setting-Up
- 1.3.2 Adjustments
- 1.4 Signal Lists
- 1.5 Circuit Schematics and Board Layouts
- 1.6 Detailed Description
- 1.6.1 Hardware Description
- 1.6.2 Adjustments and Controls
- 1.6.3 PCB Design
- 1.7 Performance Specification
- 1.7.1 Electrical Performance
1999 Consumer Microcircuits Limited UM0181/1 July 1999 Advance Information
1.0 Features
- • CMX018 Product Demonstration •• Simple and Easy to Use Controls
- • 860 - 935 MHz Operation •• Flexible VCO
- • Single 6 - 12 V Power Supply •• Optional Local Oscillator Input
- • Audio Amplifier and Data Interface •• Footprint for Front End SAW Filter
1.1 Brief Description
The EV0181 Evaluation Kit comprises a single board containing the CMX018 UHF FM/FSK receiver, frequency potentiometer, VCO tank circuitry, IF filters, 79.3MHz overtone Colpitts crystal oscillator, tuned 10.7MHz quadrature tank circuit, miniature control switches and audio amplifier. A multi-turn potentiometer allows the user to select an RF operating frequency between 860 - 935 MHz. The operating bandwidth and centre frequency can be optimised by modifying the VCO tank components. The board is powered from a single 6 - 12 V dc power supply. Regulation circuitry sets the analog(AVDD ) supply for 3V operation. CMX018 supply current may be measured by removing the appropriate jumper. A low profile 2-way DIL switch controls the device enable and gain select lines. Links, test points and SMA connector provide access to various points in the circuit. PCB footprints are provided to allow an external local oscillator to be connected to overcome settling time and frequency drift due to the frequency control potentiometer.
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 3 UM0181/1 Figure 1 Block Diagram
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 4 UM0181/1
1.2 Preliminary Information
1.2.1 Laboratory Equipment
The following laboratory equipment is needed to use this evaluation kit: 1.2.1.16-12V dc Power Supply 1.2.1.2Radio Communications Test Set or similar 1.2.1.3Oscilloscope or Audio Analyser 1.2.1.4DVM or similar
1.2.2 Handling Precautions
Like most evaluation kits, this product is designed for use in office and laboratory environments. The following practices will help ensure its proper operation. 1.2.2.1Static Protection This product uses low power CMOS circuits which can be damaged by electrostatic discharge. Partially damaged circuits can function erroneously, leading to misleading results. Observe ESD precautions at all times when handling this product. 1.2.2.2Contents - Unpacking Please ensure that you have received all of the items on the separate information sheet (EK0181) and notify CML within 7 working days if the delivery is incomplete.
1.2.3 Approvals
This Evaluation Kit is capable of producing radio frequency emissions. Users are advised to observe local statutory requirements which may apply to this product.
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 5 UM0181/1
1.3 Quick Start
This section provides instructions for users who wish to experiment immediately with the evaluation kit. A fuller description of the kit and its use appears later in this document.
1.3.1 Setting-Up
The EV0181 comes pre-configured for an RF operating frequency of ≈≈ 860MHz. The receiver is enabled and configured for low LNA gain. Using suitable coaxial cable and adapters, connect RFIN, J1, to the 50Ω input of a Radio Communications test set, or similar. Ensure this input level does not exceed the power levels specified in the target device data sheet. Apply power to the input supply connector, J3, from a suitable 6-12V dc power supply. Configure the Radio Communications test set to generate a 1kHz RF modulated input at 860MHz. Set the power level to -60dBm and modulation level to 100kHz. RSSI and AUDOUT can be monitored at TP4 and TP10, respectively. Alternatively carrier detect and data can be monitored at CDN and DATAOPN, TP1 and TP2, respectively. Using a DVM, monitor the dc voltage at RSSI. Set the RF operating frequency (860 - 935 MHz) by slowly adjusting the frequency potentiometer, RV1. Adjust RV1 until the dc level at RSSI is maximum. RV1 may need to be adjusted several times due to drift and settling time of the potentiometer. The dc voltage measured at RSSI will be typically 0.7V (low gain mode) for an RF input level of - 60dBm. The recovered 1kHz tone measured at AUDOUT will be typically 0.5Vrms for a modulation level of 100kHz. Operate switch SW1:1 to enable the receiver and switch SW1:2 to toggle between high and low LNA gain modes.
1.3.2 Adjustments
To tune the 10.7MHz quadrature tank circuit slowly turn the capacitor trimmer, CV1. A new RF operating frequency can be obtained by adjusting the trimmer potentiometer, RV1.
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1.4 Signal Lists
Ref. Connector Pin No. Signal Name Signal Type Description J1 1 RFIN I/P CMX018 RF Input J2 1 OSCIN I/P Optional Local Oscillator Input J3 1 VIN Power +ve power from external power supply
2 VSS Power 0V power from external power supply
Ref. Default Measurement Description TP1 - Carrier Detect output (CDN) TP2 - Data output (DATAOPN) TP3 0V VSS connection TP4 - CMX018 RSSI output, pin 14. TP5 0V VSS connection TP6 - CMX018 DETOUT output, pin 18. TP7 0V VSS connection TP8 0V VSS connection TP9 0V VSS connection TP10 - Amplified DETOUT output (AUDOUT) TP11 - CMX018 Buffered Oscillator output, pin 21. TP12 0V VSS connection TP13 0V VSS connection TP14 - Frequency Control Voltage TP15 3V AV DD connection TP16 3V AV DD connection TP17 0V VSS connection
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 7 UM0181/1 JUMPERS Link Ref. Positions Default Position Description JP1 1-2 S/C Disconnect to measure AVDD2 current JP2 1-2 S/C Disconnect to measure AVDD1 current ADJUSTMENTS Adjustment Ref. Adjustment Adjustment Range Description CV1 Sensitivity 5pF - 30pF 10.7MHz Quadrature Tank Circuit Tuning RV1 Frequency 0 - 3V RF Operating Frequency Control SWITCHES Switch Ref. Positions Default Position Description SW1:1 on/off on CMX018 Enable SW1:2 on/off on CMX018 Gain Select Notes: I/P = Input O/P = Output BI = Bidirectional
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 8 UM0181/1
1.5 Circuit Schematics and Board Layouts
CF = 10.7MHz in out 2GND SFECA10.7MA5-Z 10k 100k R1 RSSITP4 LNAIN GND1 LNAOUT GND2 MIX1IN MIX1OUT MIX2IN MIX2OUT GND3 GND4 LIMIN LIMDEC1 LIMDEC2 RSSI QUADIN LIMOUT VCC3 DETOUT OSCEM OSCBA OSCOUT VCC2 TANK OSCGND VCC1 LNADEC GAINSEL ENABLE CMX018D6 AVDD C15 100pF AVDD1 AVDD 4.7uF(10V) C134p7F 100nF 100nF C14 100nF C10 100nF C11 200pF CV1 5pF-30pF 2k2 R11 5k6 560R 1uH -ve +ve MAX4326ESAU1:A For U1 AVDD to Pin 8and VSS to Pin 4. 100k R2 AVDD AVDD 10k 10k 10k R4 R14 10k 100nFC53 -ve +ve U1:B MAX4326ESA L3 2u7H L2 8nH L9 8nH L10 8nH C50 270pF C42 270pF C46 220pF C47 56pF 22pF C43 22pF C51 22pF 8p2F C45 8p2F C48 C44 2p7F C49 2p7F C52 1p5F CF = 90MHz RF IN in out 1GND Front End SAW Filter not fitted.100pF capacitor (0603) connectedbetween I/P and O/P. Enable GainSelectOff = +16dBOn = -6dB R12 AVDD1 100pF C4122pF C401p5F AVDD1 100pF C16 100pF 100k R10 100k R13 SW1:1 SW1:2 C12 10nF AVDD1 C17 4.7uF(10V) C18 100pF1nF C19 C23 1nF 680nH
1 SIG 2GND
L11 - Alternative ResonatorLL1608 (0603) Toko Inductor AVDD2 VSS TP9 VSS TP13 Not Fitted VSS TP8 TP14 Not Fitted FrequencyControl +3V Supply forexternal PLL circuitry Not Fitted OSCIN C36 100nF C39 100uF(10V) L8 1uH 20k RV1 C33N/F -ve +ve MAX4326ESAU3:A -ve +ve MAX4326ESA U3:B C32 100nF 4.7uF(10V) C31 10k R16 10k R19 10k R22 R20 10k 10k R21 AVDD For U3 AVDD to Pin 8and VSS to Pin 4. TP15 AVDD Not Fitted JP2 JP1 AVDDAVDD1AVDD2 C27 10pF AUDOUTTP10 TP6DETOUT AVDD C24 15pF C28 33pF Not Fitted VSS TP12 10k R15 100k R17 N/F R18 C20 2p7F 4p7F C25 C21 220pF 79.3MHzX1 680nH C54 47nF Input Voltage6V to 12V +3V Analog Supply TP16 AVDD VI 1A VO LM317LZ C38 100nF 270RR24 330R R25 VSS TP17 Not Fitted 4.7uF(10V) C34 K A 1N4001 22uF(25V) C37 C35 100nF 47R R26 Figure 2 Evaluation Board - Circuit Schematic
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 9 UM0181/1 R25 R26 C38 R16R14 C27R22R20 C32 R7R2 C10 C31 + C37C20 R21 DETOUT TP6 TP10 AUDOUT VSSTP9 R19 C53 TP2 DATAOPN TP1 CDN R15 R17 TP3 VSS TP5 VSS C50 L1L3 C48 C49 C52 C40 C51 C14 CV1 R11 C13 TP4 RSSI C5 C2 L10 CMX018D6 C11 RF IN C41C45 SW1 TP7 VSS C47C46 C43 C42 C44 R10 C16 R12 TP8 VSS R13 C30 C36 R23 C33 TP14 RV1 C26 C35 R18 C28 C25 TP12 VSS TP11 OSCOUT C23 C21 C24 + C17L11 C18 PR1 C29 C15 C54 C22 C12 C19 R24 AVDD TP16JP2 + C34 AVDD TP15 TP17 VSS JP1 C39 VSS TP13 ENABLE Board Mod 4321 VINVSS FREQUENCY GAIN 3.00" (76.2mm) 3.00" (76.2mm) Note: Board material is FR4 Figure 3 Evaluation Board Layout - Assembly
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1.6 Detailed Description
The EV0181 Evaluation Kit comprises a single board containing the CMX018 UHF FM/FSK receiver, frequency control potentiometer, VCO tank circuitry, IF filters, 79.3MHz overtone Colpitts crystal oscillator, tuned 10.7MHz quadrature tank circuit, miniature control switches and audio amplifier. A multi-turn potentiometer allows the user to select an RF operating frequency between 860-935MHz. The operating bandwidth and centre frequency can be optimised by modifying the VCO tank components. The board is powered from a single 6-12V dc power supply. Regulation circuitry sets the analog(AVDD ) supply for 3V operation. CMX018 supply current may be measured by removing the appropriate jumper. A low profile 2-way DIL switch controls the device enable and gain select lines. Links, test points and SMA connector provide access to various points in the circuit. This open-loop configuration is not recommended for the majority of customer applications. A closed- loop PLL design is required to improve controllability and overcome stability and drift problems. External PLL circuitry could be connected to test points TP11 (OSCOUT) and TP14. This configuration also requires the capacitor C29 to be fitted and inductor L8 removed. Alternatively PCB footprints are provided to allow the user drive the VCO externally from a stable source to overcome frequency drift due to the frequency control potentiometer, RV1.
1.6.1 Hardware Description
1.6.1.1Operating Voltage The supply regulation circuitry contains a single regulator and associated components to provide the analog supply (AVDD ). The operating voltage is set to 3.0V. The supply feed is split three ways to reduce interference and to enable the user to separately measure various device/circuitry currents. The supply regulation can be bypassed and external supplies applied, via jumpers JP1 - JP2. 1.6.1.2Current Measurement Supply currents for the evaluation device and other board circuitry can be measured by removing the appropriate jumper and replacing it with a multimeter. 1.6.1.3RF Input and LNA The RF SMA input connector, RFIN, J1, is connected to the LNAIN pin of the CMX018 via a 100pF ac coupling capacitor. This capacitor can be removed and replaced by a low loss front end bandpass SAW filter, whose frequency response is application specific. The six pad SAW filter footprint employed in the EV0181 layout is compatible with a large range of SAW filter devices available from various manufacturers.
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 13 UM0181/1 Typical SAW filters which may be of interest are the wide band B4637 (902 - 928 MHz), B4682 (869 - 894 MHz) and equivalent narrow band devices, manufactured by Siemens Matsushita Components. These SAW filters have typically 2dB insertion loss and I/O matching impedance of 50Ω . The LNA switched gain function which is used to increase the dynamic range of the receiver, is controlled by gain select switch SW1:2. In the ‘off’ position the LNA will be in high gain mode, and low gain selected when in the ‘on’ position (default). High gain mode is used where maximum sensitivity is required for low level input signals. Where high level signals are present at the receiver input, which causes difficulties due to inter-modulation, the gain of the LNA can be reduced by typically 22dB, from approximately +16dB to -6dB. The output of the LNA is fed to the first on-chip mixer (MIXIN, pin 5) via an ac coupling capacitor, C3. With a good front end band pass SAW filter no further filtering should be required at the LNA output. However, customer requirements may mean an additional SAW filter is necessary at this point, for further spurious rejection. Please refer to the CMX018 device data sheet for specifications on LNA input levels (LNAIN, pin 1). 1.6.1.4VCO Tank Circuitry The local oscillator circuitry is formed by two capacitors, C22 and C26, a coaxial resonator, PR1, and varactor diode, D1, which is driven by the frequency control potentiometer, RV1. The dc voltage derived from the potentiometer, RV1, can be measured at TP14. Alternatively the inductor, L8, can be removed and dc control voltage applied to the VCO tank circuitry via TP14. The user may also drive the VCO externally from a stable source to overcome frequency drift due to the frequency control potentiometer, RV1. This setup is recommended if the user wishes to perform detailed measurements with the EV0181 evaluation board. The capacitor, C33, should be fitted (100pF), R23 replaced with a 0 Ω resistor and inductor, L8, removed before applying an external local oscillator signal via OSCIN, J2 (not fitted). The external local oscillator signal connected to OSCIN should be at a typical input level of -10dBm. The IF filters and second IF crystal have been designed so the local oscillator frequency must be set 90MHz higher than the RF input signal, for the receiver to work correctly. For evaluation purposes space is provided for the user to fit an LL1608 Toko inductor at L11. This inductor is an alternative to the coaxial resonator, PR1. The inductor will have a typical value of 3.3nH for these operating frequencies. Capacitors C22 and C26 may need to be modified with this alternative resonator. Customers concerned about the manufacture of a coaxial resonator, PR1, may wish to consider the use of a PCB track resonator. Refer to an RF/Microwave designer’s guide to obtain more information on microstrip design.
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 14 UM0181/1 1.6.1.5First IF Stage The voltage controlled local oscillator, obtained from the tank resonator circuitry, down-converts the RF input signal, such that the first IF is typically centred at 90MHz. The first IF is filtered using a 3-pole Chebyshev LC narrow bandpass filter (capacitively coupled). The filter has a 3dB pass bandwidth of approximately 3.5MHz and insertion loss of approximately 10dB. The ‘Mini Spring Air Core’ Coilcraft inductors (A03T-2) used in the filter have a tolerance of 2%. Multiple capacitor footprints have been employed in the filter layout to achieve optimum performance using preferred component values. The filter has been designed to have the same I/O matching impedance as the CMX018 I/O pins, MIX1OUT and MIX2IN, which have an impedance of 100Ω . If the user wishes to modify the IF frequencies or filter bandwidth, refer to an RF designer’s guide for information on RF filter design. 1.6.1.6Second IF Stage A 79.3MHz overtone colpitts crystal oscillator circuit is used to down-convert the first IF, such that the second IF is centred at 10.7MHz. This oscillator stage contains a Euroquartz low profile 79.3MHz crystal in a UM-5 package and has a temperature stability of ± 20ppm. This AT third overtone mode crystal has been designed to operate with a load capacitance of 20pF. The second IF is filtered using a standard Murata 10.7MHz ceramic chip filter, Y1. The filter has a 3dB pass bandwidth of 280 ± 50kHz and 20dB attenuation bandwidth of 650kHz maximum. The maximum insertion loss specified for this filter is 6dB. The I/O matching impedance of the filter is 330Ω , therefore, a simple narrow band LC matching network has been designed around the filter for matching to the CMX018 I/O pins, MIX2OUT and LIMIN, which have an impedance of 430Ω . Refer to an RF designer’s guide to obtain information on matching networks and overtone colpitts crystal oscillators. If the user wishes to modify the IF frequencies a different crystal frequency is required. 1.6.1.7RSSI and Demodulated Output In low gain mode an RF signal level of -100dBm at RFIN, J1, will produce an RSSI voltage at TP4 of typically 0.2V. The RSSI voltage will increase with increasing RF input level at a rate of approximately 20mV/dB up to a typical voltage of 0.7V (low gain mode) at an RF input level of -60dBm. An operational amplifier U1:A is configured as a comparator to provide a carrier detect output, CDN, at TP1. This output will go to a logic ‘0’ when the RSSI voltage level is greater than typically 300mV. The threshold level can be adjusted by modifying the potential divider resistors R5 and R6. A 10.7MHz quadrature tank circuit (CV1, C11, C13, C14, L4 and R11) is used to finally extract the baseband signal. The trimmer capacitor CV1 is used to tune the circuit whilst R11 determines the Q and thus the amplitude and distortion of the demodulated output.
Evaluation Kit User Manual for CMX018 EV0181 1999 Consumer Microcircuits Limited 15 UM0181/1 The CMX018 detector output pin (DETOUT pin 18) can be monitored via TP6. This output is first amplified using an operational amplifier U3. The amplified output can be monitored at AUDOUT, TP10. The level measured at AUDOUT will be typically 0.5Vrms for a 1kHz RF modulated input with a modulation level of 100kHz. The second amplifier (B) in the U1 package is also configured as a comparator to provide a digital output of the signal at AUDOUT. The threshold level is set to half supply using the potential divider resistors R7and R8. Note, the audio amplifier and data output stage is not a ‘total’ solution. It is designed to show that data can be recovered and should give reasonable BER for RF input levels >-90dBm (high gain mode). This output circuitry may need to be modified or bypassed depending on the user’s application. Reception of large continuous streams of 1’s or 0’s will not be possible unless the ac coupling capacitors, C53 and C54, are bypassed.
1.6.2 Adjustments and Controls
1.6.2.1Frequency Control The trimmer potentiometer, RV1, controls the local oscillator frequency. The control voltage derived (0-3V) from this potentiometer allows the RF operating frequency to be set between 860 - 935 MHz (90MHz below local oscillator). Using a DVM, monitor the dc voltage at RSSI. Set the RF operating frequency (860 - 935 MHz) by slowly adjusting the frequency potentiometer, RV1. Adjust RV1 until the dc level at RSSI is maximum. RV1 may need to be adjusted several times due to drift and settling time of the potentiometer. The frequency control potentiometer draws a typical current of 150µA from the AVDD2 supply. 1.6.2.210.7MHz Quadrature Tank Tuning The trimmer capacitor, CV1, allows the user to tune the 10.7MHz quadrature tank circuit. 1.6.2.3Enable and Gain Select The evaluation device enable and gain select lines are controlled by switch SW1. Switch SW1:1 allows the user to configure the CMX018 for zero-power. With SW1:1 in the ‘on’ position the device is enabled (default), and when SW1:1 is in the ‘off’ position the device is in zero- power mode. The LNA switched gain function which is used to increase the dynamic range of the receiver, is controlled by gain select switch SW1:2. In the ‘off’ position the LNA will be in high gain mode, and low gain selected when in the ‘on’ position (default).
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1.6.2.4 VCO Tank Circuitry
The coaxial resonator consists of a length of RG405 semi-rigid cable. For operating frequencies between 950 - 1025 MHz (i.e RF input 860 - 935 MHz) the outer shield should be cut to approximately 0.256” (6.5mm). One end of the inner wire should be soldered to the outer whilst the other end should be soldered to the tank PCB pad. The resonator should be laid down and outer soldered to PCB ground plane. The overall length of the resonator should be approximately 0.343” (8.7mm). Reducing the length of the coaxial resonator, PR1, will increase the resonant frequency and vice versa. Increasing C22 and C26 will reduce resonant frequency. The capacitance ratio of C26 to varactor diode, D1, will determine the achievable operating band for the 0 - 3V control voltage. Therefore to reduce the bandwidth, reduce C26 and/or insert a small picofarad capacitor, C30. The introduction of C30 will also reduce the resonant frequency.
1.6.3 PCB Design
The EV0181 PCB is a 4-layer design, with an overall thickness of 0.062” (1.57mm), including top and bottom layer copper. The top layer comprises the regulation circuitry connections, RF signal tracks and ground plane. The second layer is purely a ground plane for the supply. Layer three contains the analog power supply tracks, AVDD which feed all the board’s sub-circuits. The bottom layer contains another ground plane for additional screening. CMX018 ground pins are connected directly to the top layer ground plane as close to the package as possible. The power supply pins are bypassed to ground directly at the package using decoupling capacitors with direct returns to ground. Using microstrip techniques the RFIN track on the 4-layer PCB has been designed to provide a line impedance of 50 Ω . This design technique is based on the track width and separation distance between track and ground plane for a given dielectric constant of the PCB material. The layout assumes the board material is FR4 with a ground plane on the second layer, separated from the top layer by 0.016” (0.41mm). Therefore, for a dielectric constant between 4-5 and track width of 0.032” (0.81mm), an approximate 50 Ω line impedance is obtained. Refer to an RF/Microwave designer’s guide to obtain more information on microstrip line impedance design.
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1.7 Performance Specification
1.7.1 Electrical Performance
1.7.1.1Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the Evaluation Kit. Notes Min. Max. Units Supply (VIN - VSS ) -0.3 40.0 V Current into or out of VIN and VSS pins 0 150 mA Storage Temperature -10 +70 °C Operating Temperature +10 +35 °C Input Power to J1, RFIN 0 dBm 1.7.1.2Operating Limits Correct operation of the Evaluation Kit outside these limits is not implied. Notes Min. Max. Units Supply (VIN - VSS ) 6V 12V V Supply (AVDD - VSS ) 2.7V 3.3V V Operating Temperature +10 +35 °C 1.7.1.3Operating Characteristics For the following conditions unless otherwise specified: AV DD = 3.0V, Tamb = +25°C RFIN = 860MHz, 50Ω source impedance. Notes Typ. Units DC Parameters IDD (evaluation board - CMX018 enabled in high gain mode)1 60 mA IDD (evaluation board - CMX018 disabled) 2 10 mA Notes: 1. SW1:1 on and SW1:2 off. 2. SW1:1 off. Refer to current CML CMX018 data sheet for further information.
Evaluation Kit User Manual for CMX018 EV0181 CML does not assume any responsibility for the use of any circuitry described. No IPR or circuit patent licences are implied. CML reserves the right at any time without notice to change the said circuitry and this evaluation kit specification. Evaluation kits are supplied for the sole purpose of demonstrating the operation of CML products and are supplied without warranty. They are intended for use in a laboratory environment only and are not for re-sale, end-use or incorporation into other equipments. Operation of evaluation kits outside a laboratory environment is not permitted within the European Community. All software is supplied “as is” and is without warranty. It forms part of the evaluation kit and is licensed for use only in this kit, for the purpose of demonstrating the operation of CML products. Whilst all reasonable efforts are made to ensure that software contained in this product is virus free, CML accepts no responsibility whatsoever for any contamination which results from using this software and the onus for checking that the software is virus free is placed on the purchaser of this evaluation kit. Oval Park - LANGFORD MALDON - ESSEX CM9 6WG - ENGLAND Telephone: +44 (0)1621 875500 Telefax: +44 (0)1621 875600 e-mail: sales@cmlmicro.co.uk http://www.cmlmicro.co.uk