PCD3360 Просмотр технического описания (PDF) - Philips Electronics
Номер в каталоге
Компоненты Описание
Список матч
PCD3360 Datasheet PDF : 20 Pages
| |||
Philips Semiconductors
Programmable multi-tone telephone ringer
Product specification
PCD3360
When IS1 and IS2 are both LOW, the circuit operates in
the automatic swell mode. The SPL then increases in three
steps so that the maximum level is reached for the third
ringing burst.
Each time VDD drops below VAS the automatic swell
register is reset and the next ringing burst is considered as
N = 1 (see Table 4). A buffer capacitor (see Fig.8) must
hold VDD > VAS during the time between two consecutive
ringing bursts of a series.
For each of the other three combinations of pins IS1 and
IS2 the pulse duration has a constant value. Thus the
ringer can be designed so that the impedance represented
at the telephone line will comply with postal requirements
that vary in relation to parallel or series connections of
more than one ringer.
To satisfy some applications, a harmonic signal is added
to the fundamental frequency in the last step of the
automatic swell mode. The pulses representing this
harmonic signal are interleaved with the pulses of the
fundamental signal (see Fig.7). The difference in pulse
duration shown in Table 4, is chosen so that the harmonic
level is 10 dB below the fundamental level.
The harmonic frequency range is from 2 kHz to 3.2 kHz.
The individual harmonic frequencies for the seven tone
codes and the relative fundamental frequencies are shown
in Table 5.
Table 5 Harmonic frequency in relation to tone code and
fundamental frequency
TONE CODE
1
2
3
4
5
6
7
FREQUENCY (Hz)
FUNDAMENTAL
HARMONIC
533
600
667
800
1 000
1 067
1 333
3 200
2 400
2 667
3 200
2 000
2 133
2 667
Using a single mask it is possible to program the following:
• Addition of harmonics in all the other input states of IS1
and IS2
• All pulse duration values
• Other even harmonic frequencies.
7.10 Optical output (OPT)
The OPT output is designed to drive an optical signal
transducer or lamp. It is LOW when the ringer circuit is
enabled and HIGH when the ringer circuit is disabled. This
output can also be used to switch the transmitter ON and
OFF in the base unit of a cordless telephone set.
1997 Jan 15
8
Share Link: 