PCD3360 datasheet(7/20 Pages) PHILIPS

7 / 20 page

1997 Jan 15

Philips Semiconductors

Product speciﬁcation

Programmable multi-tone telephone ringer

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.

Table 3

Duration of time intervals (fOSC = 64 kHz)

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.

INPUT STATE

TIME INTERVAL

(ms)

RR1

RR2

LOW

HIGH

LOW

HIGH

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.

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)

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) =40V.

INPUT STATE

FUNCTION

RINGING

BURST

NUMBER (N)

PULSE

DURATION(1) (

µs)

Rxy(3)

Ω)

Zi(3)

Ω)

SPL(2)(3)

(dBr)

IS1

IS2

tfund

tharm

LOW

automatic swell

1.9

−

tbf

2.9

−

17.5

−4

4.1

1.8

LOW

HIGH

constant level

−

2.9

−

17.5

−4

HIGH

LOW

−

3.8

−

10.5

tbf

HIGH

−

5.4

−

570

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