EL4585C Elantec Semiconductor, Inc. (acquired by Intersil), EL4585C Datasheet - Page 9

• Manufacturer Part Number: EL4585C
• Description: Horizontal Genlock, 8FSC
• Manufacturer: Elantec Semiconductor, Inc. (acquired by Intersil)

Typical Application
Horizontal genlock provides clock for an analog to digital converter digitizing analog video
The above oscillators are arranged as Colpitts os-
cillators and the structure is redrawn here to em-
phasize the split capacitance used in a Colpitts
oscillator It should be noted that this oscillator
configuration is just one of literally hundreds
possible and the configuration shown here does
not necessarily represent the best solution for all
applications Crystal manufacturers are very in-
formative sources on the design and use of oscil-
lators in a wide variety of applications and the
reader is encouraged to become familiar with
them
Xtal VCO Component Values (Approximate)
Frequency
26 602
27 0
29 5
35 468
21 476
24 546
28 636
(MHz)
(k )
R1
300
300
300
300
300
300
300
(pF)
C1
15
15
15
15
15
15
15
( F)
C2
001
001
001
001
001
001
001
9
C
lates the control from the oscillator and V1 is the
primary control device C
than C
capability The frequency of oscillation is given
by
F
C
1
T
e
is to adjust the center frequency C
e
2
(C
Horizontal Genlock 8 F
V
1
1
LC
C
so that V
2
T
)
a
Colpitts Oscillator
C
(C
1
C
1
1
C
2
C
V
has maximum modulation
V
)
a
EL4585C
2
should be much larger
(C
2
C
V
)
4585 – 18
2
DC iso-
4585 – 12
SC