參數(shù)資料
型號: 935260608112
廠商: NXP SEMICONDUCTORS
元件分類: 無繩電話/電話
英文描述: TELEPHONE MULTIFUNCTION CKT, PDSO28
封裝: PLASTIC, SOT-136, SO-28
文件頁數(shù): 15/56頁
文件大?。?/td> 360K
代理商: 935260608112
2000 May 19
22
Philips Semiconductors
Product specication
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 fxtal = 3.579545 MHz.
DTMF FREQUENCY (Hz)
FREQUENCY AT
MDY/TONE (Hz)(1)
DEVIATION (%)
DEVIATION (Hz)
697
697.90
0.13
0.90
770
770.46
0.06
0.46
852
850.45
0.18
1.55
941
943.23
0.24
2.23
1209
1206.45
0.21
2.55
1336
1341.66
0.42
5.66
1477
1482.21
0.35
5.21
FLASH FUNCTION (PINS DP/FL AND DMO)
Pressing the flash function key [R] results in a calibrated
pulse which drives the electronic line current interrupter via
pin DP/FL. The DMO output is also activated during pulse
production (see Fig.23). After a flash pulse, an interflash
pause time tifp 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 tfl +tfho, the reset delay time is inhibited.
handbook, full pagewidth
MGU142
DP/FL
internal
MUTE
DMO(1)
tfho
tfl
tifp
tfl
tifp
[R] ............................ [R]
KEYS
..........................
Fig.23 Flash timing diagram.
(1) pin DMO available only on UBA205x.
tfl = flash time.
tfho = flash holdover time.
tifp = interflash pause time.
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