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參數(shù)資料
| 型號： | 935263011118 |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 通信及網(wǎng)絡(luò) |
| 英文描述： | SPECIALTY TELECOM CIRCUIT, PDSO16 |
| 封裝： | PLASTIC, SOT-162, SO-16 |
| 文件頁數(shù)： | 32/33頁 |
| 文件大?。?/td> | 574K |
| 代理商： | 935263011118 |
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Philips Semiconductors
PCD3316
CIDCW receiver
Product specication
11 March 1999
8 of 30
9397 750 04824
Philips Electronics N.V. 1999. All rights reserved.
Unrestr
icted
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 predened level VPOR(H). If VDD exceeds VPOR(H), the
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
the chip will be switched off as soon as a falling VDD reaches a predened level
(VPOR(L)).
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
amplier 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
components are needed.
When using ceramic resonators to drive the oscillator, in some cases external
components are needed; refer to the ceramic resonator product specications. Two
different congurations 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 oat, 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.
Fig 5.
Oscillator.
handbook, halfpage
MGK723
C1i
C1e
C2i
C2e
Rfb
AMPLITUDE
CONTROL
on/off
PCD3316
HXOUT
HXIN
12
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