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參數(shù)資料
| 型號： | AM79C30AVC |
| 廠商： | ADVANCED MICRO DEVICES INC |
| 元件分類： | 數(shù)字傳輸電路 |
| 英文描述： | Digital Subscriber Controller⑩ (DSC⑩) Circuit |
| 中文描述： | DATACOM, DIGITAL SLIC, PQFP44 |
| 封裝： | PLASTIC, TQFP-44 |
| 文件頁數(shù)： | 27/101頁 |
| 文件大?。?/td> | 1607K |
| 代理商： | AM79C30AVC |
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Am79C30A/32A Data Sheet
27
The output frequency of the DTMF tone generator ap-
proximately equals:
where i is the decimal equivalent of value programmed
into the FTGR register. This allows the DTMF genera-
tor to supply common dual tone call progress signals
such as Busy or Dial tones.
Note:
These coefficients do not apply to the DTMF generator.
The ATGR registers allow the user to program a gain of
–18 dB to 0 dB in 2-dB steps. Example ATGR codes to
obtain amplitude gains are listed in Table 23. 0 dB im-
plies a level of +3 dBm0. The gain values are rounded
off to the nearest 1 dB.
Note:
See the amendment to Table 23 following page 100.
Secondary Tone Ringer
A Secondary Tone Ringer is included, which is able to
ring the phone using the LS outputs while a voice con-
versation is in progress on the EAR outputs. The STR
is louder than the Tone Generator, and may be used
with or without enabling the MAP in order to provide
flexible control of system power consumption. The STR
is not available if the INIT register is programmed to
Idle or Power-Down mode. The amplitude and fre-
quency of the STR square-wave output waveform is
programmable via the STRA and STRF registers, re-
spectively. If both the LS outputs from the MAP receive
path and the STR are simultaneously enabled, priority
is given to the STR connection. The STR is available for
both the DSC and IDC circuits. A legal value must be
programmed in the STRF register before the STR is
enabled.
Table 22.
Tone Ringer and Tone Generator
Frequency Coefficients
Frequency (Hz)
Hex Code
2666
AB
2000
81
1600
67
1333
56
1142
4A
1000
41
889
39
800
34
727
2F
667
2B
615
28
571
25
533
23
500
21
471
1F
444
1D
421
1B
400
1A
381
19
364
18
348
17
333
16
320
15
DTMF Frequency in Hz
)
1
+
integer 8192 i
=
Table 23.
Amplitude Gain Coefficients
Gain (dB)
Hex Code
–18
37
–16
32
–14
31
–12
27
–10
22
–8
21
–6
20
–4
12
–2
11
0
10
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