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MT90812AP Datasheet(PDF) 49 Page - Mitel Networks Corporation |
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MT90812AP Datasheet(HTML) 49 Page - Mitel Networks Corporation |
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49 / 105 page  Advance Information MT90812 45 Table 16 - Tone Ringer Programmable Frequencies 17.0 Frequency Shift Keying (FSK) Transmitter The FSK transmitter is a phase coherent FSK modulator that generates two output frequencies, representing the ‘marks’ and ‘spaces’, of the digital data loaded into the FSK transmit memory. The ‘mark’ and ‘space frequencies are selectable to Bell 202 or CCITT V.23 standards at 1200 baud (refer to Table 17). The FSK transmitter output is a PCM coded signal that can be directed to any outgoing local TDM channel. Table 17 - FSK Signalling Frequencies As with all outgoing channels, a gain from +3 to -27 dB in steps of 1dB, as well as - dB, may be applied to the output of the FSK transmitter. Refer to Section 7.0 for further description of gain control. The signal output level is -6.12dBm0 ( µ-Law) and -12.12 dBm0 (A-law), when the programmable gains are set at zero dB. The FSK transmit memory is a 20-byte FIFO that is accessed at the address 07H. Refer to Control Register addresses indicated in Table 20 on page 53. The FSK output is memory mapped to address 5FH as shown in Table 3 on page 14. Fig. 26 illustrates the data flow for the FSK transmitter in the MT90812. coef freq coef freq coef freq coef freq coef freq coef freq coef freq coef freq 0 NA 32 242.42 64 123.08 96 82.47 128 62.02 160 49.69 192 41.45 224 35.56 1 4000.00 33 235.29 65 121.21 97 81.63 129 61.54 161 49.38 193 41.24 225 35.40 2 2666.67 34 228.57 66 119.40 98 80.81 130 61.07 162 49.08 194 41.03 226 35.24 3 2000.00 35 222.22 67 117.65 99 80.00 131 60.61 163 48.78 195 40.82 227 35.09 4 1600.00 36 216.22 68 115.94 100 79.21 132 60.15 164 48.48 196 40.61 228 34.93 5 1333.33 37 210.53 69 114.29 101 78.43 133 59.70 165 48.19 197 40.40 229 34.78 6 1142.86 38 205.13 70 112.68 102 77.67 134 59.26 166 47.90 198 40.20 230 34.63 7 1000.00 39 200.00 71 111.11 103 76.92 135 58.82 167 47.62 199 40.00 231 34.48 8 888.89 40 195.12 72 109.59 104 76.19 136 58.39 168 47.34 200 39.80 232 34.33 9 800.00 41 190.48 73 108.11 105 75.47 137 57.97 169 47.06 201 39.60 233 34.19 10 727.27 42 186.05 74 106.67 106 74.77 138 57.55 170 46.78 202 39.41 234 34.04 11 666.67 43 181.82 75 105.26 107 74.07 139 57.14 171 46.51 203 39.22 235 33.90 12 615.38 44 177.78 76 103.90 108 73.39 140 56.74 172 46.24 204 39.02 236 33.76 13 571.43 45 173.91 77 102.56 109 72.73 141 56.34 173 45.98 205 38.83 237 33.61 14 533.33 46 170.21 78 101.27 110 72.07 142 55.94 174 45.71 206 38.65 238 33.47 15 500.00 47 166.67 79 100.00 111 71.43 143 55.56 175 45.45 207 38.46 239 33.33 16 470.59 48 163.27 80 98.77 112 70.80 144 55.17 176 45.20 208 38.28 240 33.20 17 444.44 49 160.00 81 97.56 113 70.18 145 54.79 177 44.94 209 38.10 241 33.06 18 421.05 50 156.86 82 96.39 114 69.57 146 54.42 178 44.69 210 37.91 242 32.92 19 400.00 51 153.85 83 95.24 115 68.97 147 54.05 179 44.44 211 37.74 243 32.79 20 380.95 52 150.94 84 94.12 116 68.38 148 53.69 180 44.20 212 37.56 244 32.65 21 363.64 53 148.15 85 93.02 117 67.80 149 53.33 181 43.96 213 37.38 245 32.52 22 347.83 54 145.45 86 91.95 118 67.23 150 52.98 182 43.72 214 37.21 246 32.39 23 333.33 55 142.86 87 90.91 119 66.67 151 52.63 183 43.48 215 37.04 247 32.26 24 320.00 56 140.35 88 89.89 120 66.12 152 52.29 184 43.24 216 36.87 248 32.13 25 307.69 57 137.93 89 88.89 121 65.57 153 51.95 185 43.01 217 36.70 249 32.00 26 296.30 58 135.59 90 87.91 122 65.04 154 51.61 186 42.78 218 36.53 250 31.87 27 285.71 59 133.33 91 86.96 123 64.52 155 51.28 187 42.55 219 36.36 251 31.75 28 275.86 60 131.15 92 86.02 124 64.00 156 50.96 188 42.33 220 36.20 252 31.62 29 266.67 61 129.03 93 85.11 125 63.49 157 50.63 189 42.11 221 36.04 253 31.50 30 258.06 62 126.98 94 84.21 126 62.99 158 50.31 190 41.88 222 35.87 254 31.37 31 250.00 63 125.00 95 83.33 127 62.50 159 50.00 191 41.67 223 35.71 255 31.25 Mark Space Bell 202 1200 2200 CCITT V.23 1300 2100 ∞ |
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