WT8046N24P1 Просмотр технического описания (PDF) - Weltrend Semiconductor
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WT8046N24P1
Weltrend Semiconductor
WT8046N24P1 Datasheet PDF : 25 Pages
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WT8046
Synchronous Signal Discriminator with Power Saving
Detector and Test Pattern for Green Monitor
The tolerance for H sync frequency discrimination is¡ Ó0.1KHz. For instance, the 33KHz
discriminating point will be able to distinguish the H sync frequency that is either "less than or
equal to" 32.9KHz, or "greater than or equal to" 33.1KHz. There is an ambiguous region
between 32.9KHz and 33.1KHz.
WT8046 has two discriminating points, 64Hz and 78Hz, for the V sync signal as shown in Fig.1.
The tolerance is ¡ Ó0.4Hz. The discrimination results of V sync frequency are used internally for
mode selection.
Base on the package consideration, IBM VGA mode and VESA VGA mode (both have same
resolution: 640x480, 640x400, 640x350) are decoded on same open Drain structure output pins.
In case of these whole six modes decoding is needed, the horizontal frequency discrimination pin
F33k or F36.2k must take into consideration. The horizontal frequency of IBM VGA mode is
31.5kHz, and VESA IBM VGA mode is 37.5kHz. Using F33k or F36.2k pin can clearly identify
these two standard modes. The decoding circuit is attached on application section for reference.
Graphic Standard
IBM VGA
VESA Super VGA
IBM 8512/A Interlaced
VESA VGA
European Super VGA
VESA New Super VGA
IBM 8514/A Non-Interlaced
Resolution
640X350
640X400
640X480
800X600
1024X768
640X350
640X400
640X480
800X600
800X600
1024X768
Horizontal
31.5kHz
31.5kHz
31.5kHz
35.2kHz
35.5kHz
37.5kHz
37.5kHz
37.5kHz
37.5kHz
48.0kHz
48.5kHz
Vertical
70Hz
70Hz
60Hz
56Hz
86Hz
83Hz
83Hz
72Hz
60Hz
72Hz
60Hz
Polarities
+,-
-,+
-.-
+,-
-,+
-,-
Table 3: Graphic Standard and Frequencies
Weltrend Semiconductor, Inc.
2F., No. 24, Industry E. 9th Rd.
Science-Based Industrial Park
Hsin-Chu, Taiwan, R.O.C.
Tel: 886-35-780241
Fax: 886-35-770419
17
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