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參數資料
| 型號： | LM1238AAF/NA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | 3 CHANNEL, VIDEO PREAMPLIFIER, PDIP24 |
| 封裝： | N24D |
| 文件頁數： | 21/24頁 |
| 文件大小： | 1207K |
| 代理商： | LM1238AAF/NA |
Typical Performance Characteristics
V
CC = 5V, TA = 25C unless otherwise specified
SYSTEM INTERFACE SIGNALS
The Horizontal and Vertical Blanking and the Clamping input
signals are important for proper functionality of the LM1238.
Both blanking inputs must be present for OSD synchroniza-
tion. In addition, the Horizontal blanking input also assists in
setting the proper cathode black level, along with the Clamp-
ing pulse. The Vertical blanking input initiates a blanking
level at the LM1238 outputs which is programmable from 3
to 127 lines (we recommend at least 10). This can be op-
tionally disabled so there is no vertical blanking.
20038754
FIGURE 2. Logic Horizontal Blanking
20038755
FIGURE 3. Logic Vertical Blanking
20038756
FIGURE 4. Deflection Horizonal Blanking
20038757
FIGURE 5. Deflection Vertical Blanking
20038758
FIGURE 6. Logic Clamp Pulse
LM1238
www.national.com
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