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U4091BM-RFNG3Y Datasheet(PDF) 9 Page - ATMEL Corporation |
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U4091BM-RFNG3Y Datasheet(HTML) 9 Page - ATMEL Corporation |
9 / 38 page 9 4872A–CORD–08/05 U4091BM-R 9. DTMF Dialing The DTMF generator sends a multi-frequency signal through the matrix to the line. The signal is the result of the sum of two frequencies and is internally filtered. The frequencies are chosen from a low and a high frequency group. The circuit conforms to the CEPT recommendation con- cerning DTMF option. Three different levels for the low level group and two different pre- emphasis (2.5 dB and 3.5 dB) can be chosen by means of the serial bus (rec. T/CF 46-03). Attention: In high gain mode, distortion can occur if AGATX is high and DC mask is low. 10. Melody and Confidence Tone Generation Melody and confidence tone frequencies are given in Table 10-1. The frequencies are provided at the DTMF input of the switch matrix. A sinusoidal wave, a square wave or a pulsed wave can be selected by the serial bus. A square signal means the out- put is high for half of the frequency cycle, and low for the other half. A pulsed signal means high impedance phases of 1/6 of the period occur between the high and low phases. Table 10-1. Status of Melody Generating Decimal DTMFM[0:2] Status 0 000 DTMF generator OFF 1 001 Confidence tone melody on (sine) 2 010 Ringer melody (pulse) 3 011 Ringer melody (square signal) 4 100 DTMF (mid level) 5 101 DTMF (low level) 6 110 DTMF (high level) 7 111 – Table 10-2. DTMF Frequencies Decimal DTMFF[0:1] in DTMF Mode Frequency Error (%) 0 00 697 –0.007 1 01 770 –0.156 2 10 852 0.032 3 11 941 0.316 Table 10-3. DTMF Frequencies Decimal DTMFF[2:3] in DTMF Mode Frequency Error (%) 0 00 1209 –0.110 1 01 1336 0.123 2 10 1477 –0.020 3 11 1633 –0.182 |
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