UBA2050 Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

componentes Descripción

Fabricante

UBA2050

One-chip telephone ICs with speech, dialler and ringer functions

Philips Electronics 

Philips Semiconductors

One-chip telephone ICs with speech,

dialler and ringer functions

Product specification

UBA2050(A); UBA2051(A;C)

Table 3 Ringer melodies

NAME

Bell 1 (default)

Bell 2

Bell 3

Bell 4

FREQUENCIES (Hz)

770 + 943 + 1341

852 + 943 + 1206

943 + 1206 + 1341

1206 + 1341 + 1482

DURATION (ms)

28 + 28 + 28

28 + 28 + 28

28 + 28 + 28

28 + 28 + 28

handbook, full pagewidth

CE/FDI

MDY/TONE

sync

time

sample

time

Fig.19 Ringer frequency detection.

VDD

GND

MGT050

PULSE 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 (tidp).

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 CVDD discharged, no ESD diode is

implemented between pin DP/FL and pin VDD.

Pin DP/FL is an open-drain output and is set HIGH (via an

external pull-up resistor) when VDD < VPOR.

Pin DMO of the UBA205x is used to enable external

hardware (see Fig.37) which decreases the DC voltage

over the A and B network exchange terminals during pulse

dialling. Several countries require this feature. Pin DMO is

a push-pull output and is LOW when VDD < VPOR.

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

VDD < VPOR.

Figure 21 shows the timing diagram in pulse dialling mode

for the UBA205xA when keys [3], [3], [P → T] and [4] are

pressed.

2000 May 19

19

Share Link: