DATA BULLETIN DELTA MODULATION CODEC meets Mil-Std-188-113 MX629 Features Applications ➤ Military Communications Multiplexers, Switches, & Phones ➤ Meets Mil-Std-188-113 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 MX629 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 MX629 is designed to meet Mil-Std-188-113 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 MX629 operates with a supply voltage of 5.0V and is available in the following packages: 24-pin PLCC (MX629LH), 22-pin CERDIP (MX629J), and 22-pin PDIP (MX629P). 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 2 MX629 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. 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 3 MX629 ➤ ➤ 1 Block Diagram ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ Figure 1: Block Diagram 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 4 MX629 2 Signal List J/P 1 LH 1 Name Xtal/Clock Signal input N/C 2 2 3 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 output Xtal input output Powersave Decoder Force Idle 1998 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 1M pullup. Data is made available at the encoder output pin by control of this input. See Encoder Output pin. Internal 1 M 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 100. 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 M 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 1M pullup. The received digital signal input. Internal 1 M 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 M 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 5 J/P 20 21 LH 22 23 Name Clock Mode 2 Clock Mode 1 Signal 22 24 VDD power MX629 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 1M pullups. See Table 3. Positive Supply. A single 5.0V supply is required. 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 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 6 MX629 3 External Components ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ Figure 2: Recommended External Components for Typical Application 10% Note 2 1M Selectable C1 Note 3 33pF C2 Note 3 68pF R1 Note 1 R2 C3 Note 4 1.0F 20% C4 Note 5 1.0F 20% 20% C5 Note 6 20% 20% X1 Note 7, 8 1.0F 1.024MHz 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 100. 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 MX629 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 MX629 is designed to meet Mil-Std-188-113 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. 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 7 MX629 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. CODEC Integration ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ ➤ 5.1 Figure 3: System Configuration using the MX629 5.2 Digital to Analog Performance Sample Rate ‘Run of Threes’ (%) Output level (dBm0) 16kbps 11011011010010010010 Bit Sequence at Decoder Input 0 -29.22 32kbps 1101101101010100100100100100101010110110 0 -30.02 16kbps 1111101101000010010 30 01 32kbps 1111110110101010000100000010010101011110 30 01 Table 5: Bit Sequence Test and Results 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 8 MX629 Figure 4: Gain vs. Input Level (16kbps) Figure 5: Gain vs. Input Level (32kbps) Figure 6: S/N vs. Input Level (16kbps) 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 9 MX629 Figure 7: S/N vs. Input Level (32kbps) Figure 8: Attenuation distrotion vs. Frequency (16kbps) Figure 9: S/N vs. Input Frequency (16kbps) 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 10 MX629 Figure 10: S/N vs. Input Frequency (32kbps) Figure 11: Principal Integrator Response ➤ ➤ ➤ ➤ ➤ ➤ Figure 12: Compand Envelope 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 11 MX629 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 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 6.1.3 12 MX629 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 10 k 4 Analog Input Impedance 4 Analog Output Impedance 7 k 1 k 800 -4 4 3 1,9 -2 2 A dB 5, 9 -35 127 12 212 Three State Output Leakage 1998 MX-COM, Inc. M 300 Digital output impedance 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 = 0.3 to Cd = 0.0) Passband Stopband Stopband Attenuation 4200Hz to 6000Hz >6000Hz Passband Gain Passband Ripple 300Hz – 1400Hz 1400Hz – 2600Hz 2600Hz –3400Hz Output Noise (Input Short Circuit) Perfect Idle Channel Noise (Encode Forced) A V V V V 4.0 5, 9 159 3400 5.0 -35 300 6.0 dBmO Hz Hz ms 12 3400 dBmO Hz 3400 Hz KHz 16:1 300 4.2 25 9 -55 dB dB dB dB dB dB dB dBmO 9 -57 dBmO 60 0 -3 -1 -1 -2 3 1 1 3 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 13 Group Delay Distrotion (1000Hz-2600Hz) Notes 4 6 (600Hz-2800Hz) 6 (500Hz-3000Hz) Xtal/clock Frequency 6 MX629 Min. Typ. Max. Units 450 s 750 s 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 <100. 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 1998 MX-COM, Inc. Min. 1.0 Typ. Max. s 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 s ns ns ns ns s ns ns ns Doc. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 14 MX629 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 P G H 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. MX629LH 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies. Delta Modulation CODEC 15 MX629 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) 0.040 (1.02) 0.065 (1.65) 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. MX629P 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. MX629J 1998 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. # 20480190.001 All Trademarks and service marks are held by their respective companies.