- SS-HQ1 Application Notes -
Ver.1.0.0 January 7, 2005
198
Application circuit example
Following is an example application involving an external rectangular wave pulse forming circuit (WAVE
FORMER), LPF (V-PLL), and VCO circuit, which are required to configure external synchronization (line lock)
with the SS-HQ1 system.
<Note>
Although the operations of these circuits have been checked on our evaluation board, we cannot guarantee
circuit operations because PLL stability and lock range vary significantly depending on board layout as well as
the electrical characteristics and temperature characteristics of the components used.
If you want to use these circuits in your own set, please be sure to check PLL stability (jitter), supply voltage
fluctuations, and temperature fluctuations.
Fig 12.2-8 WAVE FORMER
Fig 12.2-9 LPF(
V
-PLL)
Fig 12.2-10 VCO (using 760H CCD)
LC oscillation is typically used in the MCK VCO circuit with line lock mode.
0.1u
4.7k
+3.3V
4.7k
4.7k
AC24V IN
CXD3172AR
S0(44pin)
Photocoupler
CNC1S101
TC7S14F
1u
R1
VH
10k
CXD3172AR
PCOMP
(42pin)
+
+
3.3u 3.3u
10k
10k
1M
VCO
1st INV (LPF)
2st INV (level conv)
R1
VH=15V : 56k
VH=12V : 47k
0.1u
TC4SU69F
2SC2412
10k
1000p
100k
100
20p
10p
1M
1000p
CXD3172AR
MCK
(43pin)
LPF
3.3u 12p