psb21391 Infineon Technologies Corporation, psb21391 Datasheet - Page 131

• Manufacturer Part Number: psb21391
• Description: Siemens Codec With Upn Transceiver
• Manufacturer: Infineon Technologies Corporation

The pre-emphasis of 2 dB between the high and the low DTMF-frequency groups has to
be set with the independent gain parameters (G3 and GD3 resp.) of the trapezoid
generators. All generated DTMF-frequencies are guaranteed within a
Table 18 DTMF-frequency (F3,FD) Programming
ITU-T Q.23 SCOUT
Low Group
High Group
1209
1336
1477
1633
Note: The deviations due to the inaccuracy of the incoming clock DCL/MCLK, when
Data Sheet
697
770
852
941
[Hz]
added to the nominal deviations tabulated above give the total absolute deviation
from the CCITT-recommended frequencies
Nominal [Hz]
1209.5
1336.9
1477.7
1632.8
697.1
770.3
852.2
941.4
from ITU-T
Relative Deviation
+ 143 ppm
+ 390 ppm
+ 235 ppm
+ 425 ppm
+ 414 ppm
+ 674 ppm
+ 474 ppm
– 122 ppm
121
high [HEX]
4F
A6
45
20
B4
C8
49
40
Coefficients
1 % deviation.
low [HEX]
16
18
1B
1E
26
2A
2F
34
PSB 21391
PSB 21393
2001-03-07
Codec