UPD64084 NEC, UPD64084 Datasheet - Page 17

• Manufacturer Part Number: UPD64084
• Description: THREE-DIMENSIONAL Y/C SEPARATION LSI WITH ON-CHIP MEMORY
• Manufacturer: NEC

4. CLOCK/TIMING GENERATION BLOCK
4.1
and generate system timing signals by using them as references.
4.2
reference signal to lock onto sync at the timing generator.
4.3
to detect a horizontal phase error. This phase error is used for generation of 227.5f
phase detection circuit extracts the burst signal from the composite signal sampled at 4f
This phase error is used for f
4.4
generator ahead.
4.5
judge on a color killer. If the burst amplitude becomes smaller than or equal to the set KILR value when the burst
locked clock is operating, the f
This block generates system clock pulses and timing signals from video signals.
These sections separate horizontal and vertical sync signals from the composite signal sampled at 4f
An active-low composite sync signal separated from the video signal is input at the CSI pin. This input is used as a
The horizontal phase detection circuit extracts the horizontal sync signal from the Y signal sampled at 4f
The PLL filter circuit integrates a burst or horizontal phase error to determine the oscillation frequency of the f
The killer detection circuit compares the amplitude of the burst signal with the KILR value set on the serial bus to
Composite
separator
sync signal
Composite
Sync.
Sync Separator and Timing Generator
Composite Sync Signal Input
Horizontal/Burst Phase Detection Circuit
PLL Filter Circuit
Killer Detection Circuit
input
CSI
AYI
ADC
SC
SC
generation.
Figure 4-1. Clock/Timing Generation Block Diagram
generator is allowed to free-run.
separator
System clock (8f
Timing generator
Sync.
System clock (4f
System timing
Burst phase
detection
Horizontal
detection
phase
Data Sheet S16021EJ2V0DS
SC
SC
, 1820f
, 910f
stop, CNR stop
Y/C separation
H
H
)
)
detection
Killer
filter
PLL
1/2
generator
8f
PLL
f
DAC
SC
SC
H
AGND
AGND
DGND
AVDD
FSCO
AVDD
DVDD
CLK8
FSCI
XO
and timing generator. The burst
XI
SC
to detect a burst phase error.
0.01
0.1
F
0.1
22 to 33 pF
22 to 33 pF
BPF
10
0.1
20 MHz,16 pF
f
SC
2.5 V power
supply voltage
PD64084
F
F
F
F
SC
SC
or 910f
or 910f
17
SC
H
H
,