PCD3316T/F2 Ver la hoja de datos (PDF) - Philips Electronics

Número de pieza

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Fabricante

PCD3316T/F2

Caller-ID on Call Waiting (CIDCW) receiver

Philips Electronics 

Philips Semiconductors

PCD3316

CIDCW receiver

7.9 The internal Power-on reset (POR)

The device contains an on-chip Power-on reset circuitry which activates a reset as

long as VDD is below a predefined level VPOR(H). If VDD exceeds VPOR(H), the

3.58 MHz oscillator will start. The PCD3316 is initialized and the internal registers are

U set to the default value (see Section 7.13). It takes a maximum of 100 cycles of the

3.58 MHz clock to initialize all internal functions. The POR circuitry also ensures, that

n the chip will be switched off as soon as a falling VDD reaches a predefined level

(VPOR(L)).

re7.10 3.58 MHz oscillator circuitry

sThe 3.58 MHz oscillator is needed for the FSK receiver and the CAS detection. This

on-chip Amplitude Controlled Oscillator (ACO) circuitry is a single-stage inverting

tramplifier biased by an internal feedback resistor Rfb. The oscillator circuit is shown in

Figure 5. When using a quartz resonator to drive the oscillator, normally no external

ic components are needed.

t When using ceramic resonators to drive the oscillator, in some cases external

e components are needed; refer to the ceramic resonator product specifications. Two

d different configurations are shown in Figure 6a and Figure 6b.

handbook, halfpage

AMPLITUDE

CONTROL

PCD3316

on/off

Rfb

C1i

1

HXIN

C2i

2

HXOUT

C1e

C2e

Fig 5. Oscillator.

MGK723

To drive the device with an external clock source, apply the external clock signal to

HXIN, and leave HXOUT to float, as shown in Figure 6c. If the amplitude of the input

signal is less than VDD to DGND or a sine wave is applied, capacitive decoupling is

needed as shown in Figure 6d.

In the Power-down mode (Mode register 2, bit 7 = 0), the oscillator is stopped and

HXIN and HXOUT are internally pulled LOW. The current of the whole oscillator is

switched off.

9397 750 04824

Product specification

11 March 1999

© Philips Electronics N.V. 1999. All rights reserved.

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