Philips Semiconductors

PCD3316

CIDCW receiver

Product specification

11 March 1999

8 of 30

9397 750 04824

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

7.9 The internal Power-on reset (POR)

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

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

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

7.10 3.58 MHz oscillator circuitry

The 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

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

components are needed.

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

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

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

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

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.

Fig 5.

Oscillator.

handbook, halfpage

MGK723

C1i

C1e

C2i

C2e

Rfb

AMPLITUDE

CONTROL

on/off

PCD3316

HXOUT

HXIN

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