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AK8855

NTSC/PAL Digital Video Decoder

Asahi Kasei Microdevices 

[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

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