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RC6564A
PRODUCT SPECIFICATION
10
Crystal Oscillator Internal Schematic
The crystal oscillator is an ECL inverter. It is necessary to
bias the XTL-Tnk with a choke to 5V VCC_XTL power sup-
ply. The output is about 0.7V DC lower than VCC_XTL with
an approximate swing of 0.5Vpp at the output. If the oscilla-
tor is not used, it is good to ground XTL_Tnk pin.
XTL-Tnk(1)
XTL-OUT(2)
Internal
GND-XTL (44)
V
CC
-XTL (43)
3.2K
2K
200
3.2K
Q10
Q7
Q11
130
μ
A
100pF
230
μ
A
130
μ
A
450
μ
A
450
μ
A
Q12
Q18
Q17
L
3
L
2
C
3
C
2
47pF
C
5
C
6
C
8
+5V
VCC-XTL
(43)
VCO-IN (5)
8
μ
H
33
μ
H
0.1
μ
F
0.1
μ
F
1
μ
F
1
μ
F
C
7
C
1
33pF
C
4
1nF
1nF
Logic Feedthrough
The Logic Feedthrough in the IF section can be minimized
by taking the following precautions:
1.
It is recommended to have a separate isle for the IF
section and the A/D section.
2.
All logic circuits in the neighborhood of RC6564A must
be isolated. This can be accomplished by carefully
decoupling all power supplies and all logic layout
signals.
3.
It is recommended to have as much ground plane as pos-
sible on the top and bottom of the board.