AK8855 Datasheet, PDF (8/81 Pages) Asahi Kasei Microsystems – NTSC/PAL Digital Video Decoder

[ASAHI KASEI]
(7) Quartz Crystal Oscillator circuit
Quartz crystal resonator and externally connecting load capacitance
Parameter
Symbol Min
Typ
Max
Oscillating frequency
f0
24.5454
Frequency accuracy
delta f / f
+/-100
load capacitance
CL
15
effective equivalent resistance
Re
100
Parallel capacitance
C0
0.85
XTI pin externally connecting
load
CXI
18
capacitance
XTLO pin externally connecting
load capacitance
CXO
22
note 1 ) effective equivalent resistance is generally given as :
Re = R1 x ( 1 + CO / CL ) square
Where R1 : serial equivalent resistance of crystal resonator
CO : parallel capacitance of crystal resonator
Circuit connection example
gm
Units
[MHz]
[ppm]
[pF]
[Ω]
[pF]
[pF]
[pF]
AK8855
Conditions
note1)
Rf
AK8855
XTI
XTO
Rd
Externally connecting circuit
CXI
=18pF
CXO
=22pF
Note ) Rd : as for the necessity of limiting resistor and its value, refer to the quartz crystal resonator specification
which is to be used.
MS0319-E-03
8
2004 / 11