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參數資料
| 型號： | UBA2051AT |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 無繩電話/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 |
| 文件頁數： | 19/52頁 |
| 文件大小： | 292K |
| 代理商： | UBA2051AT |
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2000 May 19
19
Philips Semiconductors
Product specification
One-chip telephone ICs with speech,
dialler and ringer functions
UBA2050(A); UBA2051(A;C)
Table 3
Ringer melodies
NAME
FREQUENCIES (Hz)
DURATION (ms)
Bell 1 (default)
Bell 2
Bell 3
Bell 4
770 + 943 + 1341
852 + 943 + 1206
943 + 1206 + 1341
1206 + 1341 + 1482
28 + 28 + 28
28 + 28 + 28
28 + 28 + 28
28 + 28 + 28
handbook, full pagewidth
CE/FDI
MDY/TONE
MGT050
VDD
GND
sample
time
sync
time
Fig.19 Ringer frequency detection.
P
ULSE DIALLER
(
PINS
DP/FL, DMO
AND
LED)
The pulse dialling system uses line current interruptions to
signal the digits dialled to the exchange. The number of
line current interruptions corresponds to the digit dialled
except for the digit [0] which is characterized by
10 interruptions. After each digit there is an inter-digit
pause time (t
idp
).
When dialling, the transmission part is muted.
The
[
/T] key definition, the dialling mode, the make/break
ratio, repetition rate (pulse dialling), the flash time and the
access pause time depend on the resistor options: MMS,
PTS, MBS, PPS, FTSA, FTSB and APT (see Fig.25 and
Table 7).
Valid keys are the digits [0] to [9], [R], [LNR/P], [P
→
T]
and [
/T] (when MMS resistor option is off).
To allow start-up from C
VDD
discharged, no ESD diode is
implemented between pin DP/FL and pin V
DD
.
Pin DP/FL is an open-drain output and is set HIGH (via an
external pull-up resistor) when V
DD
< V
POR
.
Pin DMO of the UBA205x is used to enable external
hardware (see Fig.37) which decreases the DC voltage
overtheA and Bnetworkexchangeterminalsduringpulse
dialling. Several countries require this feature. Pin DMO is
a push-pull output and is LOW when V
DD
< V
POR
.
Figure 20 shows the timing diagram in pulse dialling mode
for the UBA205x when keys [3], [3], [LNR/P] and [4] are
pressed.
Figure 20 is also valid for the UBA2051C, with the
exception of the DMO signal.
In pulse dialling mode, pin LED of the UBA205xA is set
LOW after off-hook and becomes HIGH when the first
DTMF code is sent after switching over to DTMF dialling.
Pin LED is a push-pull output and is LOW when
V
DD
< V
POR
.
Figure 21 shows the timing diagram in pulse dialling mode
for the UBA205xA when keys [3], [3], [P
→
T] and [4] are
pressed.
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