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20480150.001 mx-com 1996 DB1065 users manual mx465 ctcss encoder / decoder development kit
20480150.001 mx-com 1996 pa g e 2 table of contents 1. general information __________________________________________________ 3 1.1 introduction _____________________________________________________________ 3 1.2 warranty _______________________________________________________________ 3 1.3 DB1065 features_________________________________________________________ 4 1.4 handling precautions _____________________________________________________ 4 1.4.1 static protection _____________________________________________________________ 4 1.4.2 cleanliness _________________________________________________________________ 4 1.5 unpacking ______________________________________________________________ 4 2. electrical performance ________________________________________________ 4 2.1 absolute maximum ratings ________________________________________________ 4 2.2 operating characteristics __________________________________________________ 5 2.3 prerequisites and required equipment ________________________________________ 6 2.3.1 prerequisites ________________________________________________________________ 6 2.3.2 power supply _______________________________________________________________ 6 2.4 limitations _____________________________________________________________ 6 3. quick start __________________________________________________________ 6 3.1 introduction _____________________________________________________________ 6 3.2 first... _________________________________________________________________ 6 3.3 second - setup___________________________________________________________ 6 3.4 third - select and execute a test ____________________________________________ 7 3.4.1 ctcss encoder verification ____________________________________________________ 7 3.4.2 transmit audio path verification_________________________________________________ 8 3.4.3 ctcss decoder verification ____________________________________________________ 8 3.4.4 receive audio path verification _________________________________________________ 8 4. fourth - explore______________________________________________________ 9 4.1 measuring ctcss encoder response time _____________________________________ 9 4.2 measuring ctcss decoder response time_____________________________________ 9 4.3 measuring ctcss decoder band width _______________________________________ 9 4.4 measuring ctcss response at different sinads _______________________________ 9 4.5 performance at other operating voltages______________________________________ 10 4.6 connecting the DB1065 to a system _________________________________________ 12 4.7 tia / eia 603 __________________________________________________________ 13 5. hardware __________________________________________________________ 14 5.1 introduction ____________________________________________________________ 14 5.2 description ____________________________________________________________ 14 5.2.1 functional layout of circuitry _________________________________________________ 14 5.2.2 connectors ________________________________________________________________ 14 6. logic table for operation______________________________________________ 16 6.1 i/o conditions __________________________________________________________ 16 6.2 ctcss programming ____________________________________________________ 16 7. troubleshooting _____________________________________________________ 17 7.1 suggestions ____________________________________________________________ 17 7.2 if you still need help _____________________________________________________ 18 8. retrofitting from older designs _________________________________________ 18 8.1 comparison specifications ________________________________________________ 18 8.2 external components comparison __________________________________________ 19
20480150.001 mx-com 1996 pa g e 3 9. schematic __________________________________________________________ 20 10. component layout___________________________________________________ 21 table of figures figure 1: test equipment connections 7 figure 2: composite test signal circuit diagram 10 figure 3: testing at different supply voltages 11 figure 4: supply voltage vs typical supply current 12 figure 5: breaking out small circuit 13 figure 6: comparison of external components for older ctcss ics 19 figure 7: DB1065 schematic 20 figure 8: component view assembly drawing 21 figure 9: solder view assembly drawing 22 1. general information 1.1 introduction this manual provides general information to support the installation and operation of the DB1065 development kit, a complete test platform to demonstrate and test the mx465 ctcss encoder/ decoder. all trademarks and service marks are held by their respective owners. 1.2 warranty the DB1065 hardware has been developed and is provided to help designers develop designs based on the mx465 ctcss encoder / decoder ic. every reasonable effort has been made to provide high quality and performance in pursuit of that goal. toward that end, mx-com, inc. would value any suggestions to improve the DB1065s manual and suggestions concerning the DB1065s hardware design. since experiments and designs are the responsibility of the DB1065 user, mx-com, inc.s liability regarding the use of the DB1065 is in all cases limited to the DB1065 purchase price. no other warranty is expressed or implied.
20480150.001 mx-com 1996 pa g e 4 1.3 DB1065 features the DB1065 development kit includes many useful features including those highlighted in table. features applications mx?com mixed signal cmos design mobile radio channel sharing 47 ctcss tones + notone repeater control tx/rx speech filters wireless intercom traffic control parallel programming using dip switch serial mode also available hookswitch supervision meets tia/eia-603 land mobile standard simultaneous voice plus control signaling improved sinad remote control easy p interface table 1 DB1065 features 1.4 handling precautions like most development boards, the DB1065 is designed for use in office and laboratory environments. the following practices will help ensure its proper operation. 1.4.1 static protection the DB1065 uses low power cmos circuits which can be partially or completely damaged by electrostatic discharge. partially damaged circuits can function erroneously and provide misleading test results which can be time consuming (and extremely frustrating) to resolve. please observe common industrial static handling precautions when un-packing or handling the printed circuit board. 1.4.2 cleanliness because some DB1065 circuits are very high impedance, it is important to maintain their cleanliness. all flux and other contaminants should be thoroughly removed after making any additions or modifications to the circuit board. 1.5 unpacking after reviewing the instructions in section 1.4, handling precautions, check to make sure that each of the following items are provided in the quantities indicated: item description quantity 1. DB1065 users manual 1 2. DB1065 board 1 3. mx465 data sheet 1 2. electrical performance 2.1 absolute maximum ratings exceeding these maximum ratings can result in damage to the device. operation of the device outside the operating limits is not implied.
20480150.001 mx-com 1996 pa g e 5 absolute maximum ratings min. max. units note b+ supply voltage input -0.30 25.00 volts dc +5v supply voltage input -0.30 7.00 volts dc voltage on logic inputs or outputs -0.30 5.30 volts dc 1 voltage on analog input or outputs -0.40 20.00 volts dc storage temperature 0.00 85.00 c operating temperature 0.00 50.00 c 2.2 operating characteristics for the following conditions unless otherwise specified: t=25c, dc supply voltage b+ = +12vdc, gnd = 0v 0db ref. = 750mv rms (v dd = 5vdc ) composite ctcss test signal: 300 mvrms 1khz test tone, 75 mvrms band limited 6khz gaussian white noise, 30 mvrms ctcss tone xtal frequency = 4.0mhz, 100ppm max for additional operation characteristics refer to mx-com mx465 data sheet characteristic minimum typical maximum units note supply voltage b+ dc supply voltage input 8 12 25 vdc +5v dc supply voltage input 35 7vdc dc supply current 6 10 ma input logic specifications for pt t , ptl, cs , monitor input low voltage 1.50 vdc 1 input high voltage 3.50 vdc 1 output logic specifications for decode (open collector output) output current (sink) 10 ma analog outputs txout, rxout, toneout impedance 1000 txout level 750 mvrms rxout level 500 mvrms toneout level 500 mvrms analog inputs txin, rxin impedance 1000 txin level 100 300 mvrms rxin level 30 500 mvrms tx and rx audio filter total harmonic distortion 2 5 %thd 2 output noise level (input ac gnd) 2 mvrms passband 300 3000 hz bandpass ripple -1 1 db passband gain at 1khz 0 db ctcss decoder input signal level 30 436 mvrms 2 response time 250 ms 3,4,5 deresponse time 180.00 250 ms 3,4,5 upper decode band edge 1.005 f i .995 f i+1 hz 3,6
20480150.001 mx-com 1996 pa g e 6 characteristic minimum typical maximum units note lower decode band edge 1.005 f i-1 .995 f i hz 3,6 encoder tone output level 548 775 mvrms tone frequency accuracy (f error) -0.30 0.30 %f o total harmonic distortion 2 5 %thd notes 1 valid for +5vdc on vdd to the mx465 ic. 2 measured referenced to 0db= 1khz tone referenced to 300 mvrms 3 composite signal test condition 4f 0 >100hz (for 100 hz>f 0 >67hz: t=100/f 0 hz x 250ms) 5 per tia/eia-603 6 only for the f i in tia /eia-603, where f i is the program tone. 2.3 prerequisites and required equipment 2.3.1 prerequisites in order to effectively use the DB1065 development kit, the user should refer to the mx-com data sheet for the mx465. 2.3.2 power supply a user provided +12vdc regulated power supply is required to power the development card when connected to the b+ input. a regulated +5vdc supply is used when powering the DB1065 from the +5v input. 2.4 limitations the DB1065 development board is designed to support the serial operation of the mx465 but the user must design and connect external hardware to use this function in the mx465. refer to the mx465 data bulletin for additional assistance for using the mx465 in serial mode. all input and output analog and logic functions may be evaluated using the parallel mode of operation. 3. quick start 3.1 introduction this section allows quick setup and test verification of the DB1065 development kit. 3.2 first... review sections 1.4, handling precautions; 1.5, unpacking and 2.4, limitations sections above. (quick start?!!) dont worry, those sections are very short and help you to avoid damaging the DB1065 or your equipment. 3.3 second - setup a. connect a +12vdc power supply to b+ and gnd. b. refer to figure 1: test equipment connections, on page 7 and figure 7: DB1065 schematic, on page 20 to connect test equipment to the DB1065 development board.
20480150.001 mx-com 1996 pa g e 7 figure 1: test equipment connections 3.4 third - select and execute a test 3.4.1 ctcss encoder verification a. with the external power supply off, connect an oscilloscope or audio analyzer to toneout. ensure test equipments ground is tied to gnd on the DB1065. b. set the dip switches d0-d5 for a ctcss tone selected from table 4: ctcss tones on page 17. c. connect ptt to gnd. d. apply power. e. adjust r3 for an amplitude of 300 mvrms. f. measure the amplitude, frequency and or distortion of the ctcss tone on toneout. the frequency should correspond to the setting of the dip switch in reference to table 4: ctcss tones starting on page 17. +12vdc power supply + - analog output signals connect to audio analyzer, meter or oscilloscope analog inputs from sine wave generators or noise source optional serial interface logic level inputs logic level input or output logic level output open collector DB1065 terminals
20480150.001 mx-com 1996 pa g e 8 3.4.2 transmit audio path verification a. using an audio signal generator, set for a 1khz sine wave at 300 mvrms, connect the audio signal generator to txin. b. connect an oscilloscope or audio analyzer to txout. c. measure the output level and calculate the gain difference between txin and txout. 20*log vin/vout where vin = txin and vout = txout. d. calculate the level that represents -3 db below the output level at txout for a 1khz sine wave. 10 3 20 db txout which equals .707 x txout = -3db level e. lower the frequency of the signal generator until the -3db level is reached. f. measure the output frequency of the signal generator. this will be the lower -3db band edge of the tx audio filter. g. raise the frequency of the signal generator until the -3db level is reached. h. measure the output frequency of the signal generator. this frequency will be the upper -3db band edge of the tx audio filter. h. remove ground from ptt . the 1khz signal applied to txin should not be present at the txout connection. 3.4.3 ctcss decoder verification a. remove ground from ptt . b. measure the logic level on the monit r 0 output. with no ctcss tone it should be greater than 3 volts dc. c. connect an audio signal generator to rxin. adjust the audio generators level to 50 mvrms and its frequency to equal the ctcss tone frequency ( 1 hertz ) as set on the dip switch d0-d5 using table 4: ctcss tones starting on page 17. d. measure the logic level on the monit r 0 output. it should be less than 1 volt dc when detecting a ctcss tone. e. connect carrier sense to +5vdc. monit r 0 output should go to a hi logic level (>3vdc). 3.4.4 receive audio path verification a. ensure ptt and ptl is not connected to ground. b. using an audio signal generator, set for a 1khz sine wave at 300 mvrms, connect the audio signal generator to rxin. c. connect an oscilloscope or audio analyzer to rxout. d. measure the output level and calculate the gain difference between rxin and rxout. 20*log vin/vout where vin = rxin and vout = rxout. e. calculate the level that represents -3 db below the output level at rxout for a 1khz sine wave. 10 3 20 rxout or .707 x rxout = -3db level f. lower the frequency of the signal generator until the -3db level is reached. g. measure the output frequency of the signal generator. this will be the lower -3db band edge of the rx audio filter. h. raise the frequency of the signal generator until -3db level is reached. i. measure the output frequency of the signal generator. this will be the upper -3db band edge of the rx audio filter. j. connect ground to ptl. rx path audio should not be present at the rxout connection.
20480150.001 mx-com 1996 pa g e 9 4. fourth - explore by using the basic verification tests for receive and transmit, the performance of the mx465 can be explored by varying the frequency and level of the audio input signals. the following examples provide additional tests that can be performed. 4.1 measuring ctcss encoder response time use the ctcss encoder verification on page 7 to set up to test encoder response time. connect one channel of a storage scope to ptt and another channel of a storage scope to toneout. set the scope to trigger on ptt . connect and disconnect the ptt to ground and measure the time difference from ptt going from a logic level high to a logic low and a 90% steady level ctcss tone amplitude output on toneout. 4.2 measuring ctcss decoder response time use the ctcss decoder verification on page 8 to set up to test decoder response time. connect one channel of a storage scope to rxin and another channel of a storage scope to monit r 0 . set the scope to trigger on rxin. turn the ctcss tone off and on by connecting and disconnecting the signal generator. measure the time difference from applying ctcss tone to rxin (where the ctcss tone level reaches 90% of a full steady state level) to monit r 0 changing from a logic level hi to a logic level low ( were the logic level reaches 90% of steady low state). 4.3 measuring ctcss decoder band width use the ctcss decoder verification on page 8 to set up to evaluate decoder bandwidth. adjust the frequency of the audio generator above and below the ctcss tones center frequency and measure the band edge where monit r 0 changes from a hi ( indicating no tone present) to a low ( indicating a ctcss tone was detected). 4.4 measuring ctcss response at different sinads a composite signal summing network can be bread boarded to simulate adverse signal conditions. this consists of an opamp with three summing nodes. separate signal generators are used to simulate the 3 basic types of audio signals that may be present at rxaudios input. one signal generator is used to simulate the ctcss tone frequency and level. a noise generator that is 6khz band limited gaussian noise simulates background noise. the audio sine wave generator simulates the voice channel. a sinad meter may be connected to the rxin audio path to measure sinad of the input signal to the mx465s ctcss decoder.
20480150.001 mx-com 1996 pa g e 10 figure 2: composite test signal circuit diagram using the circuit above and setting the signal generators to the levels shown in the diagram simulates a ctcss signal in a worst case condition. the performance of the DB1065 can be measured with a sinad meter connected to rxin while each signal generator is varied to simulate different signaling conditions. 4.5 performance at other operating voltages the DB1065s performance may be evaluated at supply voltages other than the +5vdc supplied from the on board regulator. a. turn power supply off. b. disconnect the power supplys connection to j1 the b+ connection on the DB1065. c. set the power supply for an output of +5vdc. d. turn power supply off and connect it to the +5v j12 of the DB1065. e. turn on the power supply. as an example, a DB1065 was configured to detect a 67hz ctcss tone using the following configuration shown in figure 3. - + ctcss tone @ 30mvrms noise generator @ 75mvrms, band limited 6khz gaussian 1khz sine wave @ 300mvrms ctcss tone generator noise generator audio signal generator .1uf 100k .1uf .1uf 100k 100k 100k +vdd gnd gnd +vdd 100k 100k .1uf to rxin and sinad meter audio opamp 741 or similar
20480150.001 mx-com 1996 pa g e 11 figure 3: testing at different supply voltages measuring supply current at different supply voltages in the configuration shown in figure 3 would result in a typical graph as shown in figure 4. ctcss tone @ 67hz, 100mvrms 1khz sine wave @ 300mvrms ctcss tone generator audio signal generator 1k 1k DB1065, j2 rxin gnd, j13 on DB1065 variable power suppl y ground j5, ptl on DB1065 0 to +6vdc to j1, b+ on DB1065 gnd, j13 on DB1065 DB1065 +5 and gnd connections oscilloscope j6 rxout audio from DB1065
20480150.001 mx-com 1996 pa g e 12 figure 4: supply voltage vs typical supply current other performance characteristics may be measured and plotted in a similar manner. please refer to the mx465s specifications in section 2, electrical performance, on page 3 regarding maximum and minimum operating limits each device is tested to meet. section 2s information is used by the designer in regard to designing a circuit using the mx465 based on a devices electrical properties. 4.6 connecting the DB1065 to a system the DB1065 may be connected to a radio system by connecting wires to the terminal strips or the DB1065s smaller circuit may be broken out of the development board. refer to figure 5: breaking out small circuit, on page 13. before snapping the smaller circuit out the traces on the snap lines must be cut by carefully breaking off the three tabs containing the terminal strips and dip switch. try and avoid bending or flexing the smaller circuit as the surface mount components are damaged easily. a set of tin snips can be also be used to cut out the smaller board and trim up the excess or rough edge left on the smaller board. holes for soldering wires have been provided around the edge of the smaller inside circuit. refer to figure 8: component view assembly drawing, to connect wires appropriately. solder jumpers in the smaller circuit, e1 through e6, provide a method to select one ctcss tone for operation. refer to figure 9: solder view assembly drawing, for reference to solder jumpers. DB1065 / mx465 vdd vs typical supply current 0 1 2 3 4 5 6 7 8 9 10 11 12 01234567 vdd applied typical supply current in ma
20480150.001 mx-com 1996 pa g e 13 4.7 tia / eia 603 additional performance measurements are detailed in tia / eia - 603 standard. section 6 outlines standards for subaudible signaling for land mobile fm or pm communications equipment. tia / eia standards may be obtained from (tias address) (eias address) telecommunications industry association electronic industries association 2001 pennsylvania ave. nw 1722 eye street, nw suite 800 suite 440 washington, dc 2006 washington, dc 20006 phone: (202) 457-5430 phone: (202) 457-4936 fax: (202) 457-4939 fax: (202) 457-4966 an alternative source is global engineering documents, 15 inverness way east, englewood, co 80112 phone: (800) 854-7179 (they accept credit card orders) global is a company that specializes in reprinting standards and is a good source to quickly get many types of standards. #1 cut traces on the score line on both sides of the pcb with knife #2 snap apart or cut with tin snips #3 cut traces on the score line on both sides of the pcb with knife #4 snap apart or cut with tin snips #5 cut traces on the score line on both sides of the pcb with knife #6 snap apart or cut with tin snips figure 5: breaking out small circuit
20480150.001 mx-com 1996 pa g e 14 5. hardware 5.1 introduction this section describes the pcb hardware and its adjustment. 5.2 description 5.2.1 functional layout of circuitry the block diagram of the mx465 shown below shows internal connections to the mx465. refer to figure 7: DB1065 schematic, on page 20 for external circuitry on the DB1065 circuit board. 5.2.2 connectors clamping connectors are distributed around the perimeter of the DB1065 motherboard as shown in figure 8: component view assembly drawing, on page 21. silk-screen labels are provided on the motherboard to identify the connections listed in error! reference source not found. . refer to figure 7: DB1065 schematic, on page 20 in reference to the electrical connections to the mx465.
20480150.001 mx-com 1996 pa g e 15 name ref. desg. description +b j1 this is the positive supply pin usually connected to +12vdc. rxin j2 this is the input to the audio band pass filter in rx mode. txin j3 this is the tx audio input pin. in the tx mode it may be pre-filtered, usin g the tx audio path, thus helpin g to avoid talkoff due to intermodulation of low frequency speech components with the transmitted ctcss tone. txout j4 this is the band pass filtered transmit audio output pin. in tx mode the pin outputs audio present at the tx audio input pin. ptl j5 in rx mode this pin operates as a "push to listen" function by enabling the rx audio path, thus overriding the tone squelch function. tying ptl to ground will inhibite audio through the rx audio path till a ctcss tone is decoded or no tone is selected on d0-d5 rxout j6 this is the band pass filtered receive audio output pin. this pin outputs audio when rx tone decode is true or ptl is true or when notone is programmed. ptt j7 logic level input pulled low to enable transmitt mode. toneout j8 the ctcss sine wave output appears on this pin under control of the ptt input. the level is adjusted using r3. carrier sense j9 input that can be connected to the radios carrier sense logic to enable the ctcss decoder only when a carrier is present. decode j10 this is an open collector output used to mute the rx audio path or control squelch circuitry in a system. it provides a path to ground when a ctcss tone is not present and is open collector when a ctcss tone is detected. monit r 0 j11 this pin will have a +5vdc output till a ctcss tone is detected. alternatively this pin can be used to disable the open collector decode output pin and can be connected to a systems "push to listen", or monit r 0 function. +5v j12 this pin is an alternative supply pin that can be connected to an external dc supply to evaluate performance of the mx465 at supply voltages below 7.0 vdc. gnd j13 connection to ground. serial data j14 in serial operation, data to control the mx465 is clocked in on this logic input. refer to the mx465s data sheet for operation. serial clock j15 control data is clocked into the mx465 based on the rising and falling edge of this logic input. load latch j16 data is either in the process of loading into the mx465 control registers or is latched into the mx465s internal registers using this logic input pin. table 2: connector signal descriptions
20480150.001 mx-com 1996 pa g e 16 6. logic table for operation 6.1 i/o conditions input pin condition output pin condition result/function d0-d5 ptt ptl ctcss tone in decode monit r 0 tone transmitter enabled tx audio path enabled tone decoder enabled rx audio path enabled notes tone 0 0 x 0 1 yes yes no no (bias) 1 no tone 0 x x 0 1 no (bias) yes no no (bias) 2 tone 1 0 no 0 1 no (bias) no yes no (bias) 3a tone 1 1 no 0 1 no (bias) no yes yes 3b tone 1 x yes o/c 0 no (bias) no yes yes 4 no tone 1 x x o/c 0 no (bias) no yes yes 5 table 3: combinations of input/output conditions notes: o/c = open circuit x = dont care 1. normal tone transmit condition. 2. notone programmed in tx mode, tone transmit o/p set to v dd /2. tx audio path enabled. 3a. normal decode standby. 3b. normal decode standby with ptl used to enable audio. 4. normal decode of correct ctcss tone condition, ptl has no effect. 5. notone programmed in rx mode, tone transmit o/p (o/c). rx audio path enabled. 6.2 ctcss programming tone programming inputs, switch (solder jumper) nominal frequency (hz) mx465 frequency (hz) f 0 (%) d5 (e6) d4 (e5) d3 (e4) d2 (e3) d1 (e2) d0 (e1) hex 67.0 66.98 -0.0291111113f 69.3 69.32 0.02411100139 71.9 71.901 0.0010111111f 74.4 74.431 0.0421111103e 77.0 76.965 -0.0460011110f 79.7 79.677 -0.0291111013d 82.5 82.483 -0.0210111101e 85.4 85.383 -0.0201111003c 88.5 88.494 -0.0070011100e 91.5 91.456 -0.0481110113b 94.8 94.76 -0.0420111011d 97.4 97.435 -0.0361110103a 100.0 99.96 -0.040 0011010d 103.5 103.429 -0.069 0111001c 107.2 107.147 -0.05 0011000c 110.9 110.954 0.049 0110111b
20480150.001 mx-com 1996 pa g e 17 tone programming inputs, switch (solder jumper) nominal frequency (hz) mx465 frequency (hz) f 0 (%) d5 (e6) d4 (e5) d3 (e4) d2 (e3) d1 (e2) d0 (e1) hex 114.8 114.84 0.035 0010110b 118.8 118.793 -0.006 0110101a 123.0 123.028 0.023 0010100a 127.3 127.328 0.022 01100119 131.8 131.674 -0.095 00100109 136.5 136.612 0.082 01100018 141.3 141.323 0.016 00100008 146.2 146.044 -0.107 01011117 151.4 151.441 0.027 00011107 156.7 156.875 0.112 01011016 ? 159.8 159.936 0.085 11000131 162.2 162.311 0.069 00011006 167.9 167.708 -0.114 01010115 173.8 173.936 0.078 00010105 179.9 179.654 -0.137 01010014 ? 183.5 183.680 0.098 11001032 186.2 186.289 0.048 00010004 ? 189.9 190.069 0.089 11001133 192.8 192.864 0.033 01001113 ? 196.6 196.329 -0.138 11010034 ? 199.5 199.312 -0.094 11010135 203.5 203.645 0.071 00001103 ? 206.5 206.207 -0.142 11011036 210.7 210.848 0.070 01001012 218.1 217.853 -0.113 00001002 225.7 225.339 -0.160 01000111 ? 229.1 229.279 0.078 11011137 233.6 233.359 -0.103 00000101 241.8 241.970 0.070 01000010 250.3 250.282 -0.007 00000000 ? 254.1 254.162 0.024 11100038 notone n/a 11000030 serial input mode n/a 1 0 data clock x x 2x ? not specified in the tia/eia tone set table 4: ctcss tones 7. troubleshooting ideally, this section would not be required...however, sometimes the least expected (ok, the undesired) occurs. this section is intended to answer the most common questions and provide some helpful troubleshooting suggestions. 7.1 suggestions use an oscilloscope because transmit and receive are biased a.c. signals, an oscilloscope is an invaluable troubleshooting tool to probe and verify signal levels check for loose connections or jumpers
20480150.001 mx-com 1996 pa g e 18 make sure the power supplies used are sufficiently noise free. also make sure there are no unintended noise sources radiating into the test setup. 7.2 if you still need help if you have read this section, reexamined your test setup, and still cannot figure out what is wrong, please contact us for additional assistance. please be ready to describe the problem or symptoms and the steps you have taken to try to correct them. we can be reached at mx-com, inc. 4800 bethania station rd. winston-salem, nc 27105-1201 telephone (910) 744-5050 telephone (800) 638-5577 fax (910) 744-5054 8. retrofitting from older designs the following is a brief list of differences between older generation mx-com ctcss encoder/decoders and the mx465. for full details refer to each devices individual data sheets. 8.1 comparison specifications mx365 mx365a mx165a mx165b mx165c mx465 ctcss tones 38 + no tone 37 = eia 220 a plus 97.4hz 39 + no tone 37 = eia 220 b plus 69.3hz & 97.4hz 39 + no tone 37 = eia 220 b plus 69.3hz & 97.4hz 39 + no tone 39= tia/eia 603 47 + no tone 39 = tia/eia 603 plus 159.8hz, 183.5hz, 189.9hz, 196.6hz, 199.5hz, 206.5hz, 229.1hz, 254.1hz 47 + no tone 39 = tia/eia 603 plus 159.8hz, 183.5hz, 189.9hz, 196.6hz, 199.5hz, 206.5hz, 229.1hz, 254.1hz supply voltage min: 4.5v typ: 5.0v max: 5.5v min: 4.5v typ: 5.0v max: 5.5v min : 3.0v typ: 3.75v max: 4.5v min: 3.0v typ: 3.75v max: 4.5v min: 2.75v typ: 3.75/5.0v max: 5.5v min: 2.75v typ: 3.75/5.0v max: 5.5v 0db ref 300mvrms 308mvrms 100mvrms 100mvrms 750mvrms 750mvrms composite signal 0db 1khz test tone, -12db noise (band limited 6khz gaussian white noise), - 20db f 0 ctcss tone. 0db 1khz test tone, -12db noise (band limited 6khz gaussian white noise), - 20db f 0 ctcss tone. 0db 1khz test tone, -12db noise (band limited 6khz gaussian white noise), - 20db f 0 ctcss tone. 1khz test tone at 300mvrms, 75mvrms noise (band limited 6khz gaussian white noise), 30mvrms ctcss tone. 0db 1khz test tone, -12db noise (band limited 6khz gaussian white noise), - 20db f 0 ctcss tone. 0db 1khz test tone, -12db noise (band limited 6khz gaussian white noise), - 20db f 0 ctcss tone.
20480150.001 mx-com 1996 pa g e 19 8.2 external components comparison figure 6: comparison of external components for older ctcss ics external components mx365 mx365a mx165a mx165b mx165c mx465 r1 1m 1m 1m 1m 4.7m 4.7m r2 560k 560k 560k 560k 560k 560k r3 820k 820k 820k 820k 820k 820k x1 1mhz 1mhz 1mhz 1mhz 1mhz 4mhz c1 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c2 68pf 68pf 68pf 68pf 18pf 18pf c3 33pf 33pf 33pf 33pf 33pf 33pf c4 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c5 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c6 0.47uf 0.47uf 0.47uf 0.47uf 0.47uf 0.47uf c7 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c8 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c9 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c10 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf c11 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf 0.1uf d1 small signal small signal small signal small signal small signal small signal resistors 10%, capacitors 20%, xtal 100ppm max note : the values specified for r1, c2 and c3 have been found to be satisfactory when used with a crystal (x1) whose equivalent series resistance is to 1000 ohms. the crystal manufacturer should be consulted to determine optimum values for different crystals.
20480150.001 mx-com 1996 pa g e 20 9. schematic figure 7: DB1065 schematic
20480150.001 mx-com 1996 pa g e 21 10. component layout figure 8: component view assembly drawing
20480150.001 mx-com 1996 pa g e 22 figure 9: solder view assembly drawing
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 communication semiconductors cml microcircuits communication semiconductors cml microcircuits (singapore)pteltd communication semiconductors cml microcircuits (usa) inc. communication semiconductors oval park, langford, maldon, essex, cm9 6wg, england tel: +44 (0)1621 875500 fax: +44 (0)1621 875600 uk.sales@cmlmicro.com 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 us.sales@cmlmicro.com www.cmlmicro.com no 2 kallang pudding road, 09-05/ 06 mactech industrial building, singapore 349307 tel: +65 7450426 fax: +65 7452917 sg.sales@cmlmicro.com www.cmlmicro.com d/cml (d)/2 may 2002

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