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data bulletin MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective com panies. delta modulation codec meets mil-std-188-113 features applications 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 military communications multiplexers, switches, & phones ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? 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 10101010pattern in encode and a v dd /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).
delta modulation codec 2 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. contents section page 1 block diagram................................................................................................................ 3 2 signal list................................................................................................................... .... 4 3 external components.................................................................................................... 6 4 general description....................................................................................................... 6 5 application ................................................................................................................... .. 7 5.1 codec integration........................................................................................................... ... 7 5.2 digital to analog performance............................................................................................. 7 6 performance specification.......................................................................................... 11 6.1 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 6.2 packaging................................................................................................................... ....... 14 mx-com, inc. reserves the right to change specifications at any time and without notice.
delta modulation codec 3 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. 1 block diagram ? ? ? ? ? ? ? ? ? ? ? ?? ? ? ? ? ?? ? ? ? ? ? ? ? ? ? figure 1: block diagram
delta modulation codec 4 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. 2 signal list j/p lh name signal description 1 1 xtal/clock input 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. 2 n/c no connection 23 xtal output the 1.024 mhz output of the clock oscillator inverter. 3 4 n/c no connection 4 5 encoder data clock input/ output 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). 5 6 encoder output output the encoder digital output. this is a three-state output whose condition is set by the data enable and powersave inputs. see table 2. 67 idle force encoder 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. 7 8 data enable input data is made available at the encoder output pin by control of this input. see encoder output pin. internal 1 m pullup. 8 9 n/c no connection 910v bias normally at v dd /2 bias, this pin should be externally decoupled by capacitor c4. internally pulled to v ss when powersave is a logical 0. 10 11 encoder input input the analog signal input. internally biased at v dd /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. 11 12 v ss power negative supply 12 13 n/c no connection 13 14 decoder output output 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. 14 15 n/c no connection 15 16 powersave 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. 17 n/c no connection 16 18 idle force decoder a logic 0 at this pin gates a 0101... pattern internally to the decoder so that the decoder output goes to v dd /2. when this pin is a logical 1 the decoder operates as normal. internal 1m pullup. 17 19 decoder input the received digital signal input. internal 1 m pullup. 18 20 decoder data clock input/ output 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. 19 21 algorithm 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.
delta modulation codec 5 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. j/p lh name signal description 20 22 clock mode 2 21 23 clock mode 1 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. 22 24 v dd power 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) 10v ss 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
delta modulation codec 6 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. 3 external components ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 2: recommended external components for typical application r1 note 1 1m 10% c3 note 4 1.0 f 20% r2 note 2 selectable c4 note 5 1.0 f 20% c1 note 3 33pf 20% c5 note 6 1.0 f 20% c2 note 3 68pf 20% x1 note 7, 8 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. v dd 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-coms 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 v dd , 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 10101010pattern in encode and a v dd /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.
delta modulation codec 7 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. 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 v bias 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 v ss 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 1mv rms 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 ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? ? figure 3: system configuration using the MX629 5.2 digital to analog performance sample rate bit sequence at decoder input run of threes (%) output level (dbm0) 16kbps 11011011010010010010 0 -29.2 2 32kbps 1101101101010100100100100100101010110110 0 -30.0 2 16kbps 1111101101000010010 30 0 1 32kbps 1111110110101010000100000010010101011110 30 0 1 table 5: bit sequence test and results
delta modulation codec 8 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. figure 4: gain vs. input level (16kbps) figure 5: gain vs. input level (32kbps) figure 6: s/n vs. input level (16kbps)
delta modulation codec 9 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. figure 7: s/n vs. input level (32kbps) figure 8: attenuation distrotion vs. frequency (16kbps) figure 9: s/n vs. input frequency (16kbps)
delta modulation codec 10 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. figure 10: s/n vs. input frequency (32kbps) figure 11: principal integrator response ? ? ? ? ? ? figure 12: compand envelope
delta modulation codec 11 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. figure 13: attenuation distortion vs. frequency (32kbps) 6 performance specification 6.1 electrical performance 6.1.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. min. max. units supply (v dd - v ss ) -0.3 7.0 v voltage on any pin to v ss -0.3 v dd + 0.3 v current v dd -30 30 ma v ss -30 30 ma any other pin -20 20 ma j / p / lh packages total allowable power dissipation at t amb = 25c - 800 mw derating above 25c - 10 mw/c above 25c storage temperature -55 125 c operating temperature -40 85 c 6.1.2 operating limits correct operation of the device outside these limits is not implied. min typ. max. units supply (v dd - v ss ) 4.5 5.0 5.5 v operating temperature -40 85 c xtal frequency 500 1.024 1500 mhz
delta modulation codec 12 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. 6.1.3 operating characteristics for the following conditions unless otherwise specified: v dd = 5.0v at t amb = 25c, audio test frequency = 820hz xtal/clock f 0 = 1.024mhz 3-bit compand algorithm, sample clock rate = 32kbps, audio level 0db ref (0 dbm0) = 489mv rms . notes min. typ. max. units static values supply voltage 1 4.5 5.0 5.5 v supply current (enabled) 5.5 ma supply current (powersave) 400 a input logic 1 8 3.5 v input logic 0 8 1.5 v output logic 1 4.0 v output logic 0 1.0 v digital input impedance logic i/o pins 1.0 10 m logic input pins, pullup resistor 2 300 k digital output impedance 4 k analog input impedance 4 1 k analog output impedance 7 800 three state output leakage -4 4 a insertion loss 3 -2 2 db dynamic values 1,9 encoder analog signal input levels 5, 9 -35 12 dbmo principal integrator frequency 127 159 212 hz encoder passband 3400 hz compand time constant 4.0 5.0 6.0 ms decoder analog signal output levels 5, 9 -35 12 dbmo decoder passband 300 3400 hz encoder decoder (full codec) compression ration (cd = 0.3 to cd = 0.0) 16:1 passband 300 3400 hz stopband 4.2 khz stopband attenuation 4200hz to 6000hz 25 db >6000hz 60 db passband gain 0 db passband ripple -3 3 db 300hz C 1400hz -1 1 db 1400hz C 2600hz -1 1 db 2600hz C3400hz -2 3 db output noise (input short circuit) 9 -55 dbmo perfect idle channel noise (encode forced) 9 -57 dbmo
delta modulation codec 13 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. notes min. typ. max. units group delay distrotion 4 (1000hz-2600hz) 6 450 s (600hz-2800hz) 6 750 s (500hz-3000hz) 6 1.5 ms xtal/clock frequency 1024 khz 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 C 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%v dd , 3.5v = 70%v dd , 1.5v = 30%v dd , 1v = 20%v dd 9. analog voltage levels used: 0dbmo = 489mv rms = -4dbm = 0db. C15dbmo = 87mv rms . C20dbmo = 49mv rms = -24dbm. 6.1.4 timing serial bus timings (see figure 14) min. typ. max. units t ch clock 1 pulse width 1.0 s t cl clock 0 pulse width 1.0 s t ir clock rise time 0 100 ns t if clock fall time 100 ns t su data set-up time 450 ns t h data hold time 600 ns t su +t h data true time 1.5 s t pco clock to output delay time 750 ns t dr data rise time 100 ns t df data fall time 100 ns xtal input frequency = 1.024mhz
delta modulation codec 14 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. encoder timing decoder timing multiplexing function encoder clock encoder data output decoder clock decoder data input encoder output data enable high z high z data true time data clocked data clocked ch h su dr df pco ch cl if ir t t t t t t t t t t figure 14: codec timing 6.2 packaging package tolerances note : all dimensions in inches (mm.) angles are in degrees a b c d e h p f g typ. max. min. dim. k j w t y 0.435 (11.05) 0.435 (11.05) 0.051 (1.30) 0.009 (0.22) 6 30 0.409 (10.40) 0.409 (10.40) 0.146 (3.70) 0.417 (10.60) 0.417 (10.60) 0.049 (1.24) 0.006 (0.152) 0.250 (6.35) 0.250 (6.35) 0.023 (0.58) 0.047 (1.19) 0.022 (0.55) 0.018 (0.45) 0.380 (9.61) 0.380 (9.61) 0.128 (3.25) 0.048 (1.22) 45 f g p a d b e pin 1 w c j k y w h t figure 15: 24-pin plcc (lh) mechanical outline: order as part no. MX629lh
delta modulation codec 15 MX629 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 336 744 5050 fax: 336 744 5054 doc. # 20480190.001 4800 bethania station road, winston-salem, nc 27105-1201 usa all trademarks and service marks are held by their respective compa nies. note : all dimensions in inches (mm.) angles are in degrees package tolerances a b c e e1 h typ. max. min. dim. j j1 k l 0.360 (9.14) 0.480 (12.19) 0.128 (3.25) 1.100 (27.94) 0.185 (4.70) 0.420 (10.67) 0.390 (9.91) 0.420 (10.67) 0.020 (0.51) 0.020 (0.51) 0.040 (1.02) 0.066 (1.68) 1.080 (27.43) 0.330 (8.38) 0.100 (2.54) 0.045 (1.14) 0.065 (1.65) 0.015 (0.38) p 0.010 (0.25) t y 7 e y e1 t c p j1 k h j l b a pin 1 figure 16: 22-pin pdip (p) mechanical outline: order as part no. MX629p note : all dimensions in inches (mm.) angles are in degrees package tolerances b a h k l e f j1 j p c k1 e1 t pin1 a b c e e1 f h typ. max. min. dim. j j1 p t k1 k l 0.230 (5.84) 0.384 (9.75) 0.515 (13.08) 0.171 (4.34) 1.080 (27.43) 0.165 (4.19) 0.100 (2.54) 0.115 (2.92) 0.466 (11.84) 0.408 (10.36) 0.418 (10.62) 1.000 (25.40) 0.020 (0.51) 0.018 (0.46) 0.058 (1.47) 0.075 (1.91) 0.080 (2.03) 0.080 (2.03) 1.060 (26.92) 0.376 (9.55) 0.0102 (0.259) 0.055 (1.40) 0.0098 (0.249) figure 17: 22-pin cerdip (j) mechanical outline: order as part no. MX629j

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