PCD3360 查看數據表（PDF） - Philips Electronics
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PCD3360 Datasheet PDF : 20 Pages
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Philips Semiconductors
Programmable multi-tone telephone ringer
Product specification
PCD3360
7.7 Selection of repetition rates (RR1 and RR2)
The duration of a time interval within a tone sequence is
determined by the state of inputs RR1 and RR2 as shown
in Table 3. The resultant variation of repetition rates acts
as a distinguishing feature between adjacent telephones.
7.8 Drive mode selection (DM)
The output signal at pin TONE can be selected for
application with electro-dynamic or piezo-electric
transducers. An example of both signals, for a tone
frequency of 667 Hz, is shown in Fig.6.
Table 3 Duration of time intervals (fOSC = 64 kHz)
INPUT STATE
RR1
RR2
TIME INTERVAL
(ms)
LOW
LOW
15
LOW
HIGH
30
HIGH
LOW
45
HIGH
HIGH
60
The repetition rate variation can be extended by mask
programming the same tone combination for all 4 tone
sequences, but with a different number of time intervals
per tone. Thus the repetition rate can be selected from
16 values by inputs RR1, RR2, TSI and TS2. The single
tone sequence used is customer-defined.
7.8.1 LOUDSPEAKER MODE
In the loudspeaker mode (DM = LOW), pin TONE outputs
a delta-modulated signal that approximates a sinewave
sampled at a rate of 32 kHz. The output pulse duration is
determined by pins IS1 and IS2. The resultant acoustic
spectrum is aurally more acceptable and has greater
penetration than a square-wave spectrum because more
power is concentrated at the fundamental frequency.
7.8.2 PXE MODE
In the PXE mode (DM = HIGH), pin TONE outputs a
square wave. In this mode the ringer impedance and
sound pressure level are determined by characteristics
(e.g. the size) of the PXE transducer; inputs IS1 and IS2
are inactive.
7.9 Setting of impedance, sound pressure level and automatic swell (IS1 and IS2)
With DM = LOW (loudspeaker mode), inputs IS1 and IS2 determine the pulse duration of the output signal and thereby
the DC resistance Rxy (seen at points x and y in Fig.8), the input impedance Zi and also the Sound Pressure Level (SPL).
The selection of 3 impedance settings and automatic swell is shown in Table 4.
Table 4 Setting of pulse duration and automatic swell (DM = LOW)
INPUT STATE
IS1
LOW
IS2
LOW
LOW
HIGH
HIGH
HIGH
LOW
HIGH
FUNCTION
automatic swell
constant level
RINGING
BURST
NUMBER (N)
1
2
>2
−
−
−
PULSE
DURATION(1) (µs)
tfund
1.9
2.9
4.1
2.9
3.8
5.4
tharm
−
−
1.8
−
−
−
Rxy(3)
(kΩ)
40
20
5
20
10
5
Zi(3)
(kΩ)
tbf
17.5
7
17.5
10.5
7
SPL(2)(3)
(dBr)
tbf
−4
0
−4
tbf
0
Notes
1. Typical pulse durations, tfund and tharm, for the delta-modulated approximation of fundamental and harmonic signals;
valid for fOSC = 64 kHz and fclk = 32 kHz. See Fig.6 and Fig.7.
2. SPL is the relative Sound Pressure Level, and 0 dBr is defined as the SPL for IS1 = IS2 = HIGH.
3. Values of the DC resistance Rxy, bell impedance (Zi) and SPL are valid for a value of input voltage Vi(rms) = 40 V.
1997 Jan 15
7
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