UPD64084 NEC, UPD64084 Datasheet - Page 18

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

4.6
determined in the PLL filter. f
FSCO pin. Because this output contains harmonic components, they must be removed using an external band-pass
filter (BPF) connected via a buffer, before the analog sine waveform is input to the FSCI pin via a capacitor. The f
generator uses a 20 MHz free-run clock pulse as a reference.
4.7
from the CLK8 pin. It is also used as the internal system clock.
4.8
18
The f
The 8f
Supply 2.5 V to the AVDD pins. Isolate them sufficiently from the digital section power supply.
Use as wide wiring patterns as possible for the ground lines of each bypass capacitor and the DGND and AGND
pins so as to minimize their impedance.
Connect a 20-MHz Crystal resonator across the XI and XO pins. Provide guard areas using ground patterns to
keep these pins from interfering with other blocks. Table 4-1 shows the crystal resonator specification example.
Connect a BPF to the FSCO pin via an emitter follower. Supply the f
Pull down the RPLL pin via a 0
Input an active-low composite sync signal to the CSI pin. Figure 4-2 shows the external composite sync separator
application circuit example.
f
8f
Pin Treatment
SC
SC
SC
SC
Generator
generator generates f
-PLL Circuit
-PLL circuit generates 8f
Power Supply
Signal (1 V
Composite
Figure 4-2. External Composite Sync Separator Application Circuit Example
(3.3 V)
p-p
)
1
SC
Table 4-1. Crystal Resonator Specification Example
Frequency
Load Capacitance
Equivalent Serial Resistance
Frequency Permitted Tolerance
Frequency Temperature Tolerance
F
is converted by internal DAC to an analog sine waveform before it is output from the
SC
SC
220
(or 227.5f
0.1
(or 1820f
resistor.
F
1000 pF
to 2200 pF
Parameter
H
H
when the line locked clock is running) from an oscillation frequency
) from f
Data Sheet S16021EJ2V0DS
22 k
220 k
SC
(or 227.5f
1 k
2.2 k
H
20.000000 MHz
16 pF
40
50 ppm or less
50 ppm or less
) input at the FSCI pin. The 8f
Specification
SC
or less
470
signal to the FSCI pin via a capacitor.
4.7 k
Composite Sync.
Output
SC
PD64084
signal is output
SC