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參數(shù)資料
| 型號： | UPD6465GT |
| 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)： | 28/52頁 |
| 文件大小： | 570K |
| 代理商： | UPD6465GT |
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μ
PD6464A,6465
28
4.2 Test Mode Clear Command
The command that clears the test mode is as follows:
D15
D14
D13
D12
D11
D10
D9
D8
D7
D6
D5
D4
D3
D2
D1
D0
1
0
1
1
0
0
0
0
0
0
0
0
0
0
0
0
Caution
Be sure to connect the TEST pin to V
CC
when performing the above adjustment. Be sure to
connect the TEST pin to GND after adjustment.
4.3 Clamp Level of Video Signal
Match the clamp level of the composite video signal input to the
μ
PD6464A, 6465 with the internal video signal
level of the
μ
PD6464A, 6465. Otherwise, the character level in the external video signal mode will differ from
that in the internal video signal mode.
Adjustment
The internal video signal level of the
μ
PD6464A, 6465 is set by the voltage applied to the V
CNT
pin and an
“output level control command”.
The amplitude level of the internal video signal, sync-chip level, and pedestal level can be set in the following
combination:
Specified by Output
Level Control
Command
Internal Video Signal
Amplitude Level
(V
DD
= 5.0 typ.)
Sync-Chip Level
(V
DD
= 5.0 typ.)
(V
SYT
)
Pedestal Level
(V
DD
= 5.0 typ.)
(V
PED
)
V
CNT
Pin Voltage
2.5 V
Selects 1 V
p-p
1 V
p-p
1 V
1.29 V
5.0 V
Selects 2 V
p-p
2 V
p-p
1 V
1.58 V
Adjust the sync-chip and pedestal levels of the external video signal to the same level of the internal video signal
by using a variable resistor (pin 23) shown in
8. APPLICATION CIRCUIT DIAGRAM
. When setting the video
amplitude level to 1 V
p-p
, connecting a variable resistor to the V
CNT
pin is recommended to adjust the internal video
signal level (when setting the video signal to 2 V
p-p
, connect the V
CNT
pin to the power supply (5 V)).
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