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U4091BM-RFNG3Y Datasheet(PDF) 9 Page - ATMEL Corporation

Part # U4091BM-RFNG3Y
Description  Programmable Telephone Audio Processor
Download  38 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

U4091BM-RFNG3Y Datasheet(HTML) 9 Page - ATMEL Corporation

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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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