application note generation of non-standard CTCSS tones 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. mx-com manufactures several integrated circuits that encode and decode CTCSS tones at the eia rs-220 standard frequencies. in many instances, however, using tones of slightly different frequencies may be desirable. because these mx-com ics use switched capacitor technology, tone frequencies may shifted simply by changing the crystal or clock input. the following five tables list alternative tones that can be encoded and decoded by the mx165c (table 4), mx365a (table 2), mx465 (table 5), and the mx375 (table 3), and encoded by the mx315a (table 1). each table lists the tone frequencies for three crystal values for each chip. the mx165c, mx315a and mx365a use a nominal crystal value of 1.0 mhz; the table lists tone frequencies for 1.008 mhz and 1.024 mhz crystals as well as for 1.0 mhz. the mx375 and mx465 uses a 4.0 mhz nominal crystal value; these tables lists frequencies for 4.0 mhz, 4.032 mhz, and 4.096 mhz crystals. the column labeled as divisor for each table lists the quotient of the clock frequency divided by the tone frequency. this column can be used to calculate the clock frequency required to generate other tone frequencies. each table also lists the d5-d0 program code input associated with each divisor and tone frequency group. each code is listed in both binary and hexadecimal formats. as an example, to encode a 70.0 hz tone with the program code input d5-d0 = 011111 = 1f hex, the required clock would be calculated in the following manner: d5 d4 d3 d2 d1 d0 011111 divisor = 13908 tone frequency = 70.0 hz required clock frequency = divisor * tone frequency = 13908 * 70.0 hz = 973560 hz when using these ics in this manner, you must remember the following: 1. when the clock is changed, the audio pass band limits will change proportionately. these changes will be fairly small, however. for example, in the mx165c using a 1.024 mhz crystal, the lower limit will change to (1.024/1.0) * 300 = 307 hz, and the upper limit will change to (1.024/1.0) * 3000 = 3072 hz. 2. in the mx375, the frequency inversion carrier frequency will also change proportionately from its nominal value of 3333 hz. for example, with a 4.096 mhz clock, the carrier frequency will change to (4.096/4.0) * 3333 hz = 3413 hz. for proper communication, the transmitter and receiver must use the same inversion carrier frequency. 3. 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, consult your crystal manufacturer. operation of this device without a xtal or clock input may cause device damage.
generation of non-standard CTCSS tones 2 application note 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. mx315a program codes xtal freq xtal freq xtal freq binary codes hex divisor 1.0 mhz 1.008 mhz 1.024 mhz d5 d4 d3 d2 d1 d0 14912 67.06 67.60 68.67 1 1 1 1 1 1 3f 14415 69.37 69.93 71.04 1 1 1 0 0 1 39 13920 71.84 72.41 73.56 0 1 1 1 1 1 1f 13454 74.33 74.92 76.11 1 1 1 1 1 0 3e 12989 76.99 77.61 78.84 0 0 1 1 1 1 0f 12555 79.65 80.29 81.56 1 1 1 1 0 1 3d 12121 82.50 83.16 84.48 0 1 1 1 1 0 1e 11718 85.34 86.02 87.39 1 1 1 1 0 0 3c 11284 88.62 89.33 90.75 0 0 1 1 1 0 0e 10943 91.38 92.11 93.57 1 1 1 0 1 1 3b 10540 94.88 95.64 97.16 0 1 1 1 0 1 1d 10261 97.46 98.24 99.80 1 1 1 0 1 0 3a 10013 99.87 100.67 102.27 0 0 1 1 0 1 0d 9672 103.39 104.22 105.87 0 1 1 1 0 0 1c 9331 107.17 108.03 109.74 0 0 1 1 0 0 0c 9021 110.85 111.74 113.51 0 1 1 0 1 1 1b 8711 114.80 115.72 117.56 0 0 1 0 1 1 0b 8432 118.60 119.55 121.45 0 1 1 0 1 0 1a 8122 123.12 124.10 126.07 0 0 1 0 1 0 0a 7843 127.50 128.52 130.56 0 1 1 0 0 1 19 7595 131.67 132.72 134.83 0 0 1 0 0 1 09 7316 136.69 137.78 139.97 0 1 1 0 0 0 18 7068 141.48 142.61 144.88 0 0 1 0 0 0 08 6851 145.96 147.13 149.46 0 1 0 1 1 1 17 6603 151.45 152.66 155.08 0 0 0 1 1 1 07 6386 156.59 157.84 160.35 0 1 0 1 1 0 16 6169 162.10 163.40 165.99 0 0 0 1 1 0 06 5952 168.01 169.35 172.04 0 1 0 1 0 1 15 5766 173.43 174.82 177.59 0 0 0 1 0 1 05 5549 180.21 181.65 184.54 0 1 0 1 0 0 14 5363 186.46 187.95 190.94 0 0 0 1 0 0 04 5177 193.16 194.71 197.80 0 1 0 0 1 1 13 4929 202.88 204.50 207.75 0 0 0 0 1 1 03 4836 206.78 208.44 211.75 1 1 1 0 0 0 38 4743 210.84 212.53 215.90 0 1 0 0 1 0 12 4588 217.96 219.70 223.19 0 0 0 0 1 0 02 4433 225.58 227.38 230.99 0 1 0 0 0 1 11 4278 233.75 235.62 239.36 0 0 0 0 0 1 01 4123 242.54 244.48 248.36 0 1 0 0 0 0 10 3999 250.06 252.06 256.06 0 0 0 0 0 0 00 table 1: mx315a
generation of non-standard CTCSS tones 3 application note 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. mx365a program codes xtal freq xtal freq xtal freq binary codes hex divisor 1.0 mhz 1.008 mhz 1.024 mhz d5 d4 d3 d2 d1 d0 14914 67.05 67.59 68.66 1 1 1 1 1 1 3f 14426 69.32 69.87 70.98 1 1 1 0 0 1 39 13908 71.90 72.48 73.63 0 1 1 1 1 1 1f 13450 74.35 74.94 76.13 1 1 1 1 1 0 3e 12994 76.96 77.58 78.81 0 0 1 1 1 1 0f 12536 79.77 80.41 81.68 1 1 1 1 0 1 3d 12108 82.59 83.25 84.57 0 1 1 1 1 0 1e 11712 85.38 86.06 87.43 1 1 1 1 0 0 3c 11285 88.61 89.32 90.74 0 0 1 1 1 0 0e 10919 91.58 92.31 93.78 1 1 1 0 1 1 3b 10553 94.76 95.52 97.03 0 1 1 1 0 1 1d 10279 97.29 98.07 99.62 1 1 1 0 1 0 3a 10004 99.96 100.76 102.36 0 0 1 1 0 1 0d 9668 103.43 104.26 105.91 0 1 1 1 0 0 1c 9333 107.15 108.01 109.72 0 0 1 1 0 0 0c 9028 110.77 111.66 113.43 0 1 1 0 1 1 1b 8723 114.64 115.56 117.39 0 0 1 0 1 1 0b 8418 118.80 119.75 121.65 0 1 1 0 1 0 1a 8143 122.80 123.78 125.75 0 0 1 0 1 0 0a 7869 127.08 128.10 130.13 0 1 1 0 0 1 19 7595 131.67 132.72 134.83 0 0 1 0 0 1 09 7320 136.61 137.70 139.89 0 1 1 0 0 0 18 7076 141.32 142.45 144.71 0 0 1 0 0 0 08 6832 146.37 147.54 149.88 0 1 0 1 1 1 17 6619 151.09 152.30 154.72 0 0 0 1 1 1 07 6374 156.88 158.14 160.65 0 1 0 1 1 0 16 6161 162.31 163.61 166.21 0 0 0 1 1 0 06 5947 168.14 169.49 172.18 0 1 0 1 0 1 15 5764 173.48 174.87 177.64 0 0 0 1 0 1 05 5551 180.15 181.59 184.47 0 1 0 1 0 0 14 5368 186.29 187.78 190.76 0 0 0 1 0 0 04 5185 192.86 194.40 197.49 0 1 0 0 1 1 13 4910 203.65 205.28 208.54 0 0 0 0 1 1 03 4758 210.17 211.85 215.21 0 1 0 0 1 0 12 4575 218.58 220.33 223.83 0 0 0 0 1 0 02 4422 226.12 227.93 231.55 0 1 0 0 0 1 11 4270 234.19 236.06 239.81 0 0 0 0 0 1 01 4148 241.08 243.01 246.87 0 1 0 0 0 0 10 3996 250.28 252.28 256.29 0 0 0 0 0 0 00 table 2: mx365a
generation of non-standard CTCSS tones 4 application note 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. mx375 program codes xtal freq xtal freq xtal freq binary codes hex divisor 4.0 mhz 4.032 mhz 4.096 mhz d5 d4 d3 d2 d1 d0 59657 67.05 67.59 68.66 1 1 1 1 1 1 3f 55633 71.90 72.48 73.63 0 1 1 1 1 1 1f 53800 74.35 74.94 76.13 1 1 1 1 1 0 3e 51975 76.96 77.58 78.81 0 0 1 1 1 1 0f 50144 79.77 80.41 81.68 1 1 1 1 0 1 3d 48432 82.59 83.25 84.57 0 1 1 1 1 0 1e 46849 85.38 86.06 87.43 1 1 1 1 0 0 3c 45142 88.61 89.32 90.74 0 0 1 1 1 0 0e 43678 91.58 92.31 93.78 1 1 1 0 1 1 3b 42212 94.76 95.52 97.03 0 1 1 1 0 1 1d 41114 97.29 98.07 99.62 1 1 1 0 1 0 3a 40016 99.96 100.76 102.36 0 0 1 1 0 1 0d 38673 103.43 104.26 105.91 0 1 1 1 0 0 1c 37331 107.15 108.01 109.72 0 0 1 1 0 0 0c 36111 110.77 111.66 113.43 0 1 1 0 1 1 1b 34892 114.64 115.56 117.39 0 0 1 0 1 1 0b 33670 118.80 119.75 121.65 0 1 1 0 1 0 1a 32573 122.80 123.78 125.75 0 0 1 0 1 0 0a 31476 127.08 128.10 130.13 0 1 1 0 0 1 19 30379 131.67 132.72 134.83 0 0 1 0 0 1 09 29280 136.61 137.70 139.89 0 1 1 0 0 0 18 28305 141.32 142.45 144.71 0 0 1 0 0 0 08 27328 146.37 147.54 149.88 0 1 0 1 1 1 17 26474 151.09 152.30 154.72 0 0 0 1 1 1 07 25497 156.88 158.14 160.65 0 1 0 1 1 0 16 24644 162.31 163.61 166.21 0 0 0 1 1 0 06 23790 168.14 169.49 172.18 0 1 0 1 0 1 15 23057 173.48 174.87 177.64 0 0 0 1 0 1 05 22204 180.15 181.59 184.47 0 1 0 1 0 0 14 21472 186.29 187.78 190.76 0 0 0 1 0 0 04 20740 192.86 194.40 197.49 0 1 0 0 1 1 13 19642 203.65 205.28 208.54 0 0 0 0 1 1 03 19032 210.17 211.85 215.21 0 1 0 0 1 0 12 18300 218.58 220.33 223.83 0 0 0 0 1 0 02 17690 226.12 227.93 231.55 0 1 0 0 0 1 11 17080 234.19 236.06 239.81 0 0 0 0 0 1 01 16592 241.08 243.01 246.87 0 1 0 0 0 0 10 15982 250.28 252.28 256.29 0 0 0 0 0 0 00 table 3: mx375
generation of non-standard CTCSS tones 5 application note 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. mx165c program codes xtal freq xtal freq xtal freq binary codes hex divisor 1.0mhz 1.008mhz 1.024mhz d5 d4 d3 d2 d1 d0 14930 66.98 67.52 68.59 1 1 1 1 1 1 3f 14426 69.32 69.87 70.98 1 1 1 0 0 1 39 13908 71.901 72.48 73.63 0 1 1 1 1 1 1f 13435 74.431 75.03 76.22 1 1 1 1 1 0 3e 12993 76.965 77.58 78.81 0 0 1 1 1 1 0f 12551 79.677 80.31 81.59 1 1 1 1 0 1 3d 12124 82.483 83.14 84.46 0 1 1 1 1 0 1e 11712 85.383 86.07 87.43 1 1 1 1 0 0 3c 11300 88.494 89.20 90.62 0 0 1 1 1 0 0e 10934 91.456 92.19 93.65 1 1 1 0 1 1 3b 10553 94.76 95.52 97.03 0 1 1 1 0 1 1d 10263 97.435 98.21 99.77 1 1 1 0 1 0 3a 10004 99.96 100.76 102.36 0 0 1 1 0 1 0d 9668 103.429 104.26 105.91 0 1 1 1 0 0 1c 9333 107.147 108.00 109.72 0 0 1 1 0 0 0c 9013 110.954 111.84 113.62 0 1 1 0 1 1 1b 8708 114.84 115.76 117.60 0 0 1 0 1 1 0b 8418 118.793 119.74 121.64 0 1 1 0 1 0 1a 8128 123.028 124.01 125.98 0 0 1 0 1 0 0a 7854 127.328 128.35 130.38 0 1 1 0 0 1 19 7595 131.674 132.73 134.83 0 0 1 0 0 1 9 7320 136.612 137.70 139.89 0 1 1 0 0 0 18 7076 141.323 142.45 144.71 0 0 1 0 0 0 8 6847 146.044 147.21 149.55 0 1 0 1 1 1 17 6603 151.441 152.65 155.08 0 0 0 1 1 1 7 6375 156.875 158.13 160.64 0 1 0 1 1 0 16 6161 162.311 163.61 166.21 0 0 0 1 1 0 6 5963 167.708 169.05 171.73 0 1 0 1 0 1 15 5749 173.936 175.33 178.11 0 0 0 1 0 1 5 5566 179.654 181.09 183.97 0 1 0 1 0 0 14 5368 186.289 187.78 190.76 0 0 0 1 0 0 4 5185 192.864 194.41 197.49 0 1 0 0 1 1 13 4911 203.645 205.27 208.53 0 0 0 0 1 1 3 4743 210.848 212.53 215.91 0 1 0 0 1 0 12 4590 217.853 219.60 223.08 0 0 0 0 1 0 2 4438 225.339 227.14 230.75 0 1 0 0 0 1 11 4285 233.359 235.23 238.96 0 0 0 0 0 1 01 4133 241.97 243.91 247.78 0 1 0 0 0 0 10 3995 250.282 252.28 256.29 0 0 0 0 0 0 00 table 4: mx165c
generation of non-standard CTCSS tones 6 application note 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. mx465 program codes xtal freq xtal freq xtal freq binary codes hex divisor 4.0mhz 4.032mhz 4.096mhz d5 d4 d3 d2 d1 d0 59719 66.98 67.52 68.59 1 1 1 1 1 1 3f 57703 69.32 69.87 70.98 1 1 1 0 0 1 39 55632 71.901 72.48 73.63 0 1 1 1 1 1 1f 53741 74.431 75.03 76.22 1 1 1 1 1 0 3e 51972 76.965 77.58 78.81 0 0 1 1 1 1 0f 50203 79.677 80.31 81.59 1 1 1 1 0 1 3d 48495 82.483 83.14 84.46 0 1 1 1 1 0 1e 46848 85.383 86.07 87.43 1 1 1 1 0 0 3c 45201 88.494 89.20 90.62 0 0 1 1 1 0 0e 43737 91.456 92.19 93.65 1 1 1 0 1 1 3b 42212 94.76 95.52 97.03 0 1 1 1 0 1 1d 41053 97.435 98.21 99.77 1 1 1 0 1 0 3a 40016 99.96 100.76 102.36 0 0 1 1 0 1 0d 38674 103.429 104.26 105.91 0 1 1 1 0 0 1c 37332 107.147 108.00 109.72 0 0 1 1 0 0 0c 36051 110.954 111.84 113.62 0 1 1 0 1 1 1b 34831 114.84 115.76 117.60 0 0 1 0 1 1 0b 33672 118.793 119.74 121.64 0 1 1 0 1 0 1a 32513 123.028 124.01 125.98 0 0 1 0 1 0 0a 31415 127.328 128.35 130.38 0 1 1 0 0 1 19 30378 131.674 132.73 134.83 0 0 1 0 0 1 9 29280 136.612 137.70 139.89 0 1 1 0 0 0 18 28304 141.323 142.45 144.71 0 0 1 0 0 0 8 27389 146.044 147.21 149.55 0 1 0 1 1 1 17 26413 151.441 152.65 155.08 0 0 0 1 1 1 7 25498 156.875 158.13 160.64 0 1 0 1 1 0 16 24644 162.311 163.61 166.21 0 0 0 1 1 0 6 23851 167.708 169.05 171.73 0 1 0 1 0 1 15 22997 173.936 175.33 178.11 0 0 0 1 0 1 5 22265 179.654 181.09 183.97 0 1 0 1 0 0 14 21472 186.289 187.78 190.76 0 0 0 1 0 0 4 20740 192.864 194.41 197.49 0 1 0 0 1 1 13 19642 203.645 205.27 208.53 0 0 0 0 1 1 3 18971 210.848 212.53 215.91 0 1 0 0 1 0 12 18361 217.853 219.60 223.08 0 0 0 0 1 0 2 17751 225.339 227.14 230.75 0 1 0 0 0 1 11 17141 233.359 235.23 238.96 0 0 0 0 0 1 01 16531 241.97 243.91 247.78 0 1 0 0 0 0 10 15982 250.282 252.28 256.29 0 0 0 0 0 0 00 table 5: mx465
generation of non-standard CTCSS tones 7 application note 1998 mx-com, inc. www. mxcom.com tel: 800 638 5577 910 744 5050 fax: 910 744 5054 doc. # 20830061.002 4800 bethania station road, winston-salem, nc 27105-1201 usa. all trademarks and service marks are held by their respective comp anies. the eia rs-220 specification divides the standard frequencies into three groups. they are tabulated below with the program codes used in mx-com ics: group a group b group c freq code freq code freq code 67.0 3f 71.9 1f 74.4 3e 77.0 0f 82.5 1e 79.7 3d 88.5 0e 94.8 1d 85.4 3c 100.0 0d 103.5 1c 91.5 3b 107.2 0c 110.9 1b 114.8 0b 118.8 1a 97.4 3a 123.0 0a 127.3 19 69.3 39 131.8 09 136.5 18 206.5 38 141.3 08 146.2 17 151.4 07 156.7 16 162.2 06 167.9 15 173.8 05 179.9 14 186.2 04 192.8 13 203.5 03 210.7 12 218.1 02 225.7 11 233.6 01 241.8 10 250.3 00 table 6: eia rs-220 specifications groups a, b, and c note that with the exception of the 67.0 hz tone in group a, the programming codes are in reverse sequential order in relation to the tone frequencies for each group. again, with the exception of 67.0 hz, also note that the first hexadecimal digit for group a is 0, the first digit for group b is 1, and the first digit for group c is 3. for more general information about these ics, see the mx-com product handbook and the mx-com mx165c, mx315a, mx365a, mx375, and mx465 data bulletins. mx-com does not test its CTCSS ics (mx165c, mx315a, mx365a, mx375, and mx465) at crystal or clock frequencies other than the nominal frequency specified in the performance specifications section of the data bulletin, and as such, makes no guarantee of the performance of the device when used with a non-specified crystal or clock frequency. mx-com does not assume responsibility for the use of its ics in the manner described in this application note in any circuit or product.
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