SAA5281GP Philips Semiconductors, SAA5281GP Datasheet - Page 26

• Manufacturer Part Number: SAA5281GP
• Description: Integrated Video input processor and Teletext decoder IVT1.8
• Manufacturer: Philips Semiconductors

Philips Semiconductors
CLOCK SYSTEMS
Crystal oscillator
The crystal is a conventional Colpitts 3-pin design
operating at 27 MHz. The oscillator is sinusoidal and
linear, with a controlled output amplitude. This reduces the
radiated and conducted level of the 27 MHz fundamental
Table 13 Crystal characteristics (see Fig.13)
1996 Nov 04
handbook, full pagewidth
Crystal (27 MHz, 3rd overtone)
C1
C0
C
R
R1
X
X
X
a
j
d
Integrated Video input processor and
Teletext decoder (IVT1.8*)
L
r
SYMBOL
Fig.13 Crystal oscillator application diagram for SOT240-1; pins in parenthesis are for SOT247-1.
series capacitance
parallel capacitance
load capacitance
resonance resistance
series resistance
ageing
adjustment tolerance
drift
3.3 k
1 nF
overtone
27 MHz
3.3 H
PARAMETER
3rd
15 pF
8.2 pF
100 nF
OSCGND
OSCOUT
OSCIN
V DD1
26
frequency, and reduces the power dissipation in the quartz
crystal. It is capable of oscillating with both fundamental
and third overtone mode crystals. External components
should be used to suppress the fundamental output of the
third overtone as illustrated in Fig.13. The crystal
characteristics are given in Table 13.
1
2
4
3
(52)
(2)
(1)
(3)
1.7
5.2
20
20
TYP.
OSCILLATOR
CRYSTAL
SAA5281
50
5
25
25
MAX.
10
10
10
MBD786
6
Preliminary specification
6
6
SAA5281
pF
pF
pF
year
UNIT
1