參數(shù)資料
型號: UPD6465
廠商: NEC Corp.
英文描述: ON-SCREEN CHARACTER DISPLAY CMOS LSI FOR 12-LINE, 24-COLUMN DECK-TYPE VCR
中文描述: 屏幕字符顯示的CMOS大規(guī)模集成電路的12線,24柱甲板型錄像機
文件頁數(shù): 30/52頁
文件大小: 570K
代理商: UPD6465
μ
PD6464A,6465
30
5. COMPOSITE SYNC. SIGNAL SEPARATION CIRCUIT
An example of composite sync. signal separation circuit is shown in Figure 5-1.
Figure 5-1. Composite Sync. Signal Separation Circuit
(a) Example of Composite Sync. Signal Separation Circuit
R1 = 5.1 k
, R2 = 1.2 k
, R3 = 1 k
, R4 = 220
, R5 = 100 k
, R6 = 10 k
, R7 = 1 k
, R8 = 2.2 k
,
R9 = 10 k
, C1 = 10
μ
F, C2 = 1
μ
F, C3 = 1000 pF
(b) Image of sync. signal separation waveform
The slice level (V
S
) of Figure 5-1 (a) is defined as follows.
V
S
= 2.7
×
R5
R4
×
T
2
T
1
= 74 mV
..
R1
R3
R5
R2
Q1
a
b
+
+
C1
C2
Composite video signal
(2 V
p-p
)
V
C
c
I
sp
I
X
R4
R8
R9
C3
Q2
R6
R7
Q3
V
DD
= 5 V
Composite sync. signal
(sync. positive)
0.7 V
DD
(MIN.)
0.3 V
DD
(MAX.)
Input to pin 17
T
1
T
2
T
1
= 4.7 s
T
2
= 58.86 s
V
C2
V
C
V
C3
V
C1
μ
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