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參數(shù)資料
| 型號(hào)： | UBA2051AT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無(wú)繩電話/電話 |
| 英文描述： | One-chip telephone ICs with speech, dialler and ringer functions |
| 中文描述： | TELEPHONE MULTIFUNCTION CKT, PDSO28 |
| 封裝： | PLASTIC, SOT-136, SO-28 |
| 文件頁(yè)數(shù)： | 22/52頁(yè) |
| 文件大小： | 292K |
| 代理商： | UBA2051AT |
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2000 May 19
22
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
Table 4
DTMF standard frequencies and their implementation
Note
1.
Assuming f
xtal
= 3.579545 MHz.
DTMF FREQUENCY (Hz)
FREQUENCY AT
MDY/TONE (Hz)
(1)
DEVIATION (%)
DEVIATION (Hz)
697
770
852
941
1209
1336
1477
697.90
770.46
850.45
943.23
1206.45
1341.66
1482.21
0.13
0.06
0.18
0.24
0.21
0.42
0.35
0.90
0.46
1.55
2.23
2.55
5.66
5.21
F
LASH FUNCTION
(
PINS
DP/FL
AND
DMO)
Pressing the flash function key [R] results in a calibrated
pulsewhichdrivestheelectroniclinecurrentinterruptervia
pin DP/FL. The DMO output is also activated during pulse
production (see Fig.23). After a flash pulse, an interflash
pause time t
ifp
of 800 ms is inserted to recover the power
supply for the dialler part.
The duration of the flash time depends on the resistor
options FTSA and FTSB (see Fig.25 and Table 7).
During t
fl
+ t
fho
, the reset delay time is inhibited.
handbook, full pagewidth
MGU142
DP/FL
internal
MUTE
DMO
(1)
tfho
tfho
tfl
tifp
tfl
tifp
[R]
............................
[R]
KEYS
..........................
Fig.23 Flash timing diagram.
(1) pin DMO available only on UBA205x.
t
fl
= flash time.
t
fho
= flash holdover time.
t
ifp
= interflash pause time.
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