MX619 COMMUNICATION ICs Delta Modulation Codec meets EUROCOM D1-IA8 DATA BULLETIN Features Applications • • • • • • • • • ➤ Military Communications Multiplexers, Switches, & Phones ➤ Meets EUROCOM D1-IA8 Single Chip Full Duplex CVSD CODEC On-chip Input and Output Filters Programmable Sampling Clocks 3- or 4-bit Companding Algorithm Powersave Capabilities Low Power, 5.0V Operation ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ The MX619 is a Continuously Variable Slope Delta Modulation (CVSD) Codec designed for use in military communications systems. This device is suitable for applications in military delta multiplexers, switches, and phones. The MX619 is designed to meet EUROCOM D1-IA8 specifications. Encoder input and decoder output filters are incorporated on-chip. Sampling clock rates can be programmed to 16, 32, or 64kbps from an internal clock generator or externally injected in the 8 to 64kbps range. The sampling clock frequency is output for the synchronization of external circuits. The encoder has an enable function for use in multiplexer applications. Encoder and Decoder forced idle capabilities are provided forcing 10101010…pattern in encode and a VDD/2 bias in decode. The companding circuit may be operated with an externally selectable 3- or 4-bit algorithm. The device may be placed in standby mode by selecting Powersave. A reference 1.024MHz oscillator uses an external clock or crystal. The MX619 operates with a supply voltage of 5.0V and is available in the following packages: 24-pin PLCC (MX619LH), 22-pin CERDIP (MX619J), and 22-pin PDIP (MX619P). 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 2 MX619 CONTENTS Section Page 1 Block Diagram................................................................................................................ 3 2 Signal List....................................................................................................................... 4 3 External Components.................................................................................................... 6 4 General Description....................................................................................................... 6 5 Application ..................................................................................................................... 7 5.1 5.2 CODEC Integration.............................................................................................................. 7 Digital to Analog Performance............................................................................................. 7 6 Performance Specification.......................................................................................... 11 6.1 6.2 Electrical Performance ...................................................................................................... 11 6.1.1 Absolute Maximum Ratings.................................................................................................. 11 6.1.2 Operating Limits ................................................................................................................... 11 6.1.3 Operating Characteristics..................................................................................................... 12 6.1.4 TIMING................................................................................................................................. 13 Packaging.......................................................................................................................... 14 MX-COM, Inc. reserves the right to change specifications at any time and without notice. 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 3 MX619 ➤ ➤ 1 Block Diagram ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ Figure 1: Block Diagram 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 4 MX619 2 Signal List J/P 1 LH 1 Name Xtal/Clock Signal input 2 3 N/C 2 Xtal output 3 4 4 5 N/C Encoder Data Clock input/ output 5 6 Encoder Output output 6 7 Encoder Force Idle 7 8 Data Enable 8 9 9 10 N/C VBIAS 10 11 Encoder Input input 11 12 13 12 13 14 VSS N/C Decoder Output power 14 15 15 16 N/C N/C 16 17 18 17 19 Decoder Input 18 20 Decoder Data Clock 19 21 Algorithm input output Powersave Decoder Force Idle 2000 MX-COM, Inc. input/ output Description Input to the clock oscillator inverter. A 1.024MHz Xtal input or externally derived clock is injected here. See Clock Mode pins and Figure 2. No Connection The 1.024 MHz output of the clock oscillator inverter. No Connection A logic I/O port. External encode clock input or internal data clock output. Clock frequency is dependent upon Clock Mode 1, 2 inputs and Xtal frequency (see Clock Mode pins). The encoder digital output. This is a three-state output whose condition is set by the Data Enable and Powersave inputs. See Table 2. When this pin is at a logical “0” the encoder is forced to an idle state and the encoder digital output is 0101, a perfect idle pattern. When this pin is a logical “1” the encoder encodes as normal. Internal 1MΩ pullup. Data is made available at the encoder output pin by control of this input. See Encoder Output pin. Internal 1 MΩ pullup. No Connection Normally at VDD/2 bias, this pin should be externally decoupled by capacitor C4. Internally pulled to VSS when “ Powersave ” is a logical “0”. The analog signal input. Internally biased at VDD/2, this input requires an external coupling capacitor. The source impedance should be less than 100Ω. Output channel noise levels will improve with an even lower source impedance. See Figure 2. Negative Supply No Connection The recovered analog signal is output at this pin. It is the buffered output of a lowpass filter and requires external components. During “Powersave” this output is open circuit. No Connection A logic “0” at this pin puts most parts of the codec into a quiescent non-operational state. When at a logical “1”, the codec operates normally. Internal 1 MΩ pullup. No Connection A logic “0” at this pin gates a 0101... pattern internally to the decoder so that the Decoder Output goes to VDD/2. When this pin is a logical “1” the decoder operates as normal. Internal 1MΩ pullup. The received digital signal input. Internal 1 MΩ pullup. A logic I/O port. External decode clock input or internal data clock output, dependent upon clock mode 1,2 inputs. See Clock Mode pins. A logic “1” at this pin sets this device for a 3-bit companding algorithm. A logical “0” sets a 4-bit companding algorithm. Internal 1 MΩ pullup. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 5 J/P 20 LH 22 Name Clock Mode 2 21 23 Clock Mode 1 22 24 VDD Signal MX619 Description Clock rates refer to f = 1024MHz Xtal/Clock input. During internal operation the data clock frequencies are available at the ports for external circuit synchronization. Independent or common data rate inputs to Encode and Decode data clock ports may be employed in the External Clocks mode. Internal 1MΩ pullups. See Table 3. Positive Supply. A single 5.0V supply is required. power Table 1: Signal List Data Enable Powersave Encoder Output 1 1 Enable 0 1 High Z (open circuit) 1 0 VSS Table 2: Encoder Output Clock Mode 1 Clock Mode 2 Facility 0 0 External Clocks 0 1 Internal, 64kbps = f/16 1 0 Internal, 32kbps = f/32 1 1 Internal, 16kbps = f/64 Table 3: Clock Mode 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 6 MX619 3 External Components VDD XTAL/CLOCK R1 X1 C2 C1 R2 XTAL N/C ENCODER DATA CLOCK ENCODER OUTPUT ENCODER FORCE IDLE DATA ENABLE N/C BIAS ENCODER INPUT C3 VSS 1 22 2 21 3 20 4 19 5 6 MX619J 18 17 7 16 8 15 9 14 10 13 11 12 VDD CLOCK MODE 1 CLOCK MODE 2 ALGORITHM DECODER DATA CLOCK DECODER INPUT DECODER FORCE IDLE POWERSAVE N/C DECODER OUTPUT N/C C5 C4 Figure 2: Recommended External Components for Typical Application ±10% Note 2 1MΩ Selectable C1 Note 3 33pF C2 Note 3 68pF R1 Note 1 R2 C3 Note 4 1.0µF ±20% C4 Note 5 1.0µF ±20% ±20% C5 Note 6 ±20% Note 7, 8 1.0µF 1.024MHz ±20% X1 Table 4: Recommended External Components for Typical Application Notes: 1. Oscillator inverter bias resister. 2. Xtal Drive limiting resistor. 3. Xtal circuit load capacitor. 4. Encoder input coupling capacitor. The drive source impedance to this input should be less than 100Ω. Output idle channel noise levels will improve with even lower source impedance. 5. Bias decoupling capacitor 6. VDD decoupling capacitor 7. A 1.024MHz Xtal/Clock input will yield exactly 16/32/64kbps data clock rates. Xtal circuitry shown is in accordance with MX-COM’s Xtal Oscillator Application Note. 8. For best results, a crystal oscillator design should drive the clock inverter input with signal levels of at least 40% of VDD, peak to peak. Tuning fork crystals generally cannot meet this requirement. To obtain crystal oscillator design assistance, please consult you crystal manufacturer. 4 General Description The MX619 is a Continuously Variable Slope Delta Modulation (CVSD) Codec designed for use in military communications systems. This device is suitable for applications in military delta multiplexers, switches and phones. The MX619 is designed to meet EUROCOM D1-IA8 specifications. Encoder input and decoder output filters are incorporated on-chip. Sampling clock rates can be programmed to 16, 32, or 64kbps from an internal clock generator or externally injected in the 8 to 64kbps range. The sampling clock frequency is output for the synchronization of external circuits. The encoder has an enable function for use in multiplexer applications. Encoder and Decoder forced idle capabilities are provided forcing 10101010…pattern in encode and a VDD/2 bias in decode. The companding circuit may be operated with an externally selectable 3- or 4-bit algorithm. The device may be placed in standby mode by selecting Powersave. A reference 1.024MHz oscillator uses an external clock or crystal. 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 7 MX619 5 Application Due to the very low levels of a signal idle channel noise specified for military applications, a noisy or badly regulated power supply could cause instability, putting the overall system performance out of specification. Adherence to the points listed below will assist in minimizing this problem. 1. Care should be taken in the design and layout of the printed circuit board. 2. All external components (as recommended in Figure 2) should be kept close to the package. 3. Tracks should be kept short, particularly the Encoder Input capacitor and the VBIAS capacitor. 4. Xtal/Clock tracks should be kept well away from analog inputs and outputs. 5. Inputs and outputs should be screened whenever possible. 6. A ‘ground plane’ connected to VSS will assist in eliminating external pick-up on the input and output pins. 7. It is recommended that the power supply rails have less that 1mVRMS of noise allowed. 8. The source impedance to the Encoder Input pin must be less that 100W; output idle channel, noise levels will improve with even power source impedances. 5.1 CODEC Integration MX619 PARAMETERS MEASURED HERE SYSTEM INPUT ANALOG INPUT INTERFACE (BALUN & BUFFER) MX619 PARAMETERS MEASURED HERE REGULATED POWER SUPPLY MX619 ENCODER DATA MX619 DECODER CLOCK MODE 16/32/64 KB/S ANALOG OUTPUT INTERFACE (BALUN & BUFFER) SYSTEM OUTPUT DATA CLOCKS CLOCKS 1.024MHz 1.024MHz SYNCHRONOUS CLOCK AND DATA SYSTEM Figure 3: System Configuration using the MX619 5.2 Digital to Analog Performance Test Sample Rate a 16kbps 32kbps b Bit Sequence at Decoder Input MLA Duty Cycle Typical Output Level 10110100100100101101 1011011010101001001001001001010101101101 0 0 -41.5dBmO –42.5dBmO 16kbps 32kbps 11011001001001001101 1011011010101001001000100100101011011011 0.05 0.05 -25.0dBmO –25.0dBmO c 16kbps 32kbps 10110101000100101011 1101101101010010001000100100101011011101 0.1 0.1 -19.0dBmO -18.5dBmO d 16kbps 32kbps 11011001000010011011 1101110110010100010000100010011010111011 0.2 0.2 -11.0dBmO –11.5dBmO e 16kbps 32kbps 11011010000010010111 111011101100100010000001001001101110111 0.3 0.3 -6.5dBmO –6.5dBmO f 16kbps 32kbps 11011010000001001111 1111011101010001000000001000101011101111 0.4 0.4 -3.0dBmO –3.0dBmO g 16kbps 32kbps 111010100000001011 1111101110100010000000000100010111011111 0.5 0.5 0dBmO 0dBmO Table 5: Bit Sequence Test 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 8 MX619 Figure 4: Gain vs. Input Level (16kbps) Figure 5: Gain vs. Input Level (32kbps) Figure 6: S/N vs. Input Level (16kbps) 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 9 MX619 Figure 7: S/N vs. Input Level (32kbps) Figure 8: Attenuation distrotion vs. Frequency (16kbps) Figure 9: S/N vs. Input Frequency (16kbps) 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 10 MX619 Figure 10: S/N vs. Input Frequency (32kbps) Figure 11: Principal Integrator Response ➤ ➤ ➤ ➤ ➤ ➤ Figure 12: Compand Envelope 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 11 MX619 Figure 13: Attenuation Distortion vs. Frequency (32kbps) 6 Performance Specification 6.1 6.1.1 Electrical Performance Absolute Maximum Ratings Exceeding these maximum ratings can result in damage to the device. Supply (VDD - VSS) Voltage on any pin to VSS Current VDD VSS any other pin J / P / LH Packages Total Allowable Power Dissipation at TAMB = 25°C Derating above 25°C Storage Temperature Operating Temperature 6.1.2 Min. -0.3 -0.3 Max. 7.0 VDD + 0.3 Units V V -30 -30 -20 30 30 20 mA mA mA -55 -40 800 10 125 85 mW mW/°C above 25°C °C °C Operating Limits Correct operation of the device outside these limits is not implied. Supply (VDD - VSS) Operating Temperature Xtal Frequency 2000 MX-COM, Inc. Min 4.5 -40 500 Typ. 5.0 1.024 Max. 5.5 85 1500 www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Units V °C MHz Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 6.1.3 12 MX619 Operating Characteristics For the following conditions unless otherwise specified: VDD = 5.0V at TAMB = 25°C, Audio Test Frequency = 820Hz Xtal/Clock f0 = 1.024MHz 3-bit Compand Algorithm, Sample Clock Rate = 32kbps, Audio level 0dB ref (0 dBm0) = 489mVRMS. Static Values Supply Voltage Supply Current (Enabled) Supply Current (Powersave) Input logic ‘1’ Input Logic ‘0’ Output Logic ‘1’ Output Logic ‘0’ Digital Input Impedance Logic I/O pins Logic Input pins, Pullup Resistor Notes Min. Typ. Max. Units 1 4.5 5.0 5.5 400 5.5 V mA 8 8 3.5 1.5 4.0 1.0 1.0 2 4 Analog Output Impedance 7 2000 MX-COM, Inc. kΩ 4 kΩ 1 kΩ 800 Ω -4 4 3 1,9 -2 2 µA dB 5, 9 -35 Three State Output Leakage Insertion Loss Dynamic Values Encoder Analog signal Input levels Principal Integrator Frequency Encoder Passband Compand Time Constant Decoder Analog Signal Output Levels Decoder Passband Encoder Decoder (Full Codec) Compression Ration (Cd = 0.5 to Cd = 0.0) Passband Stopband Stopband Attenuation Passband Gain Passband Ripple 300Hz – 1400Hz 1400Hz – 2600Hz 2600Hz –3400Hz Output Noise (Input Short Circuit) Perfect Idle Channel Noise (Encode Forced) MΩ 300 Digital output impedance Analog Input Impedance 10 6 dBmO Hz Hz ms 6 3400 dBmO Hz 3400 10 Hz KHz dB dB dB dB dB dB dBmOp 275 3400 4.0 5, 9 -35 300 -10 50 300 6 60 0 -3 -1 -1 -2 3 1 1 3 -60 9 9 -63 www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA µA V V V V dBmOp Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 13 Group Delay Distortion (1000Hz-2600Hz) MX619 Notes 4 6 (600Hz-2800Hz) 6 (500Hz-3000Hz) Xtal/clock Frequency 6 Min. Typ. Max. Units 450 µs 750 µs ms kHz 1.5 1024 Notes: 1. Dynamic characteristics are specified at 5.0V unless otherwise specified. 2. All logic inputs except Encoder and Decoder Data clocks 3. For and encoder/Decoder combination, Insertion loss contributed by a single component is half this figure. 4. Driven with a source impedance of <100Ω. 5. Recommended values – See Figures 4, 5, 6, and 7. 6. Group Delay Distortion for the full codec is relative to the delay with and 820Hz, -20dB signal at the encoder input 7. An Emitter Follower output stage. 8. 4V = 80%VDD, 3.5V = 70%VDD, 1.5V = 30%VDD, 1V = 20%VDD 9. Analog Voltage Levels used: 0dBmO = 489mVRMS = -4dBm = 0dB. –15dBmO = 87mVRMS. –20dBmO = 49mVRMS = -24dBm. 6.1.4 TIMING Serial Bus Timings (See Figure 14) tCH Clock 1 pulse width tCL Clock 0 pulse width tIR tIF tSU tH tSU +tH Clock rise time Clock fall time Data set-up time Data hold time Data true time tPCO Clock to output delay time tDR Data rise time tDF Data fall time Xtal input frequency = 1.024MHz 2000 MX-COM, Inc. Min. 1.0 Typ. Max. µs 1.0 0 100 100 450 600 1.5 750 100 100 www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Units µs ns ns ns ns µs ns ns ns Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 14 MX619 ENCODER TIMING ENCODER CLOCK tCH tCH tCL t IR tIF DATA CLOCKED ENCODER DATA OUTPUT tPCO DECODER TIMING DECODER CLOCK DATA CLOCKED DECODER DATA INPUT tSU tH DATA TRUE TIME MULTIPLEXING FUNCTION ENCODER OUTPUT HIGH Z HIGH Z t DF tDR DATA ENABLE Figure 14: CODEC Timing 6.2 Packaging E B C Package Tolerances K Y DA W J W T PIN 1 H P G DIM. A B C D E F G H J K P T W Y MIN. TYP. MAX. 0.409 (10.40) 0.380 (9.61) 0.409 (10.40) 0.380 (9.61) 0.146 (3.70) 0.128 (3.25) 0.435 (11.05) 0.417 (10.60) 0.435 (11.05) 0.417 (10.60) 0.250 (6.35) 0.250 (6.35) 0.023 (0.58) 0.018 (0.45) 0.022 (0.55) 0.047 (1.19) 0.048 (1.22) 0.051 (1.30) 0.049 (1.24) 0.009 (0.22) 0.006 (0.152) 30° 45° 6° NOTE : All dimensions in inches (mm.) Angles are in degrees F Figure 15: 24-pin PLCC (LH) Mechanical Outline: Order as part no. MX619LH 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 15 MX619 Package Tolerances A B E1 DIM. A B C E E1 H J J1 K L P T Y E Y T PIN 1 K C H L J J1 MIN. TYP. MAX. 1.100 (27.94) 0.360 (9.14) 1.080 (27.43) 0.330 (8.38) 0.185 (4.70) 0.420 (10.67) 0.480 (12.19) 0.390 (9.91) 0.420 (10.67) 0.020 (0.51) 0.045 (1.14) 0.015 (0.38) 0.020 (0.51) 0.065 (1.65) 0.040 (1.02) 0.066 (1.68) 0.128 (3.25) 0.100 (2.54) 0.010 (0.25) 7° NOTE : All dimensions in inches (mm.) Angles are in degrees P Figure 16: 22-pin PDIP (P) Mechanical Outline: Order as part no. MX619P Package Tolerances A B E1 E T PIN1 K K1 C H L J J1 P F DIM. A B C E E1 F H J J1 K K1 L P T MIN. TYP. MAX. 1.080 (27.43) 1.060 (26.92) 0.384 (9.75) 0.376 (9.55) 0.165 (4.19) 0.230 (5.84) 0.466 (11.84) 0.515 (13.08) 0.408 (10.36) 0.418 (10.62) 1.000 (25.40) 0.020 (0.51) 0.018 (0.46) 0.055 (1.40) 0.058 (1.47) 0.080 (2.03) 0.075 (1.91) 0.080 (2.03) 0.115 (2.92) 0.171 (4.34) 0.100 (2.54) 0.0098 (0.249) 0.0102 (0.259) NOTE : All dimensions in inches (mm.) Angles are in degrees Figure 17: 22-pin CERDIP (J) Mechanical Outline: Order as part no. MX619J 2000 MX-COM, Inc. www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054 4800 Bethania Station Road, Winston-Salem, NC 27105-1201 USA Doc. # 20480189.002 All Trademarks and service marks are held by their respective companies. CML Microcircuits COMMUNICATION SEMICONDUCTORS CML Product Data In the process of creating a more global image, the three standard product semiconductor companies of CML Microsystems Plc (Consumer Microcircuits Limited (UK), MX-COM, Inc (USA) and CML Microcircuits (Singapore) Pte Ltd) have undergone name changes and, whilst maintaining their separate new names (CML Microcircuits (UK) Ltd, CML Microcircuits (USA) Inc and CML Microcircuits (Singapore) Pte Ltd), now operate under the single title CML Microcircuits. These companies are all 100% owned operating companies of the CML Microsystems Plc Group and these changes are purely changes of name and do not change any underlying legal entities and hence will have no effect on any agreements or contacts currently in force. CML Microcircuits Product Prefix Codes Until the latter part of 1996, the differentiator between products manufactured and sold from MXCOM, Inc. and Consumer Microcircuits Limited were denoted by the prefixes MX and FX respectively. These products use the same silicon etc. and today still carry the same prefixes. In the latter part of 1996, both companies adopted the common prefix: CMX. This notification is relevant product information to which it is attached. CML Microcircuits (USA) [formerly MX-COM, Inc.] Product Textual Marking On CML Microcircuits (USA) products, the ‘MX-COM’ textual logo is being replaced by a ‘CML’ textual logo. Company contact information is as below: CML Microcircuits (UK)Ltd CML Microcircuits (USA) Inc. CML Microcircuits (Singapore)PteLtd COMMUNICATION SEMICONDUCTORS COMMUNICATION SEMICONDUCTORS COMMUNICATION SEMICONDUCTORS Oval Park, Langford, Maldon, Essex, CM9 6WG, England Tel: +44 (0)1621 875500 Fax: +44 (0)1621 875600 [email protected] www.cmlmicro.com 4800 Bethania Station Road, Winston-Salem, NC 27105, USA Tel: +1 336 744 5050, 0800 638 5577 Fax: +1 336 744 5054 [email protected] www.cmlmicro.com No 2 Kallang Pudding Road, 09-05/ 06 Mactech Industrial Building, Singapore 349307 Tel: +65 7450426 Fax: +65 7452917 [email protected] www.cmlmicro.com D/CML (D)/2 May 2002