wt8043 ETC-unknow, wt8043 Datasheet - Page 17

• Manufacturer Part Number: wt8043
• Description: Synchronous Signal Discriminator For Multi-sync Display Monitor
• Manufacturer: ETC-unknow

Horizontal Frequency Discriminator
SYNC Output State Description
There are 3 horizontal frequency discriminator pins on 20 pin type package:
36.2kHz, 45kHz, 52kHz (for N20P1), 33kHz, 36.2kHz, 45kHz (for N20P4); 2
frequency discriminator pins on 16 pin type package: 33kHz, 36.2kHz and 6
frequency discriminator pins on 24 pin type package: 33kHz, 36.2kHz, 45kHz,
52kHz, 62kHz and 72kHz. Please refer to table 3 for the logical truth table of
these pins. These frequency discriminator pins can pull up to +12V through a
resistor, sink current to the open drain structure must keep under 6mA (ref. P4
Electrical Characteristics). These frequency discriminator pins output can be used
for CS Capacitor Control directly as well as other application.
Both H_out / V_out duplicate Hsin/Vsin in the same frequency and pulse width,
but are fixed at negative polarity. And H_out/ V_out have their own cut-off
frequency: 15kHz for H_Sync and 30Hz for V_Sync. While the frequency of input
signal is less than the cut-off frequency, the output will keep in low state. Please
refer to the Table 4.
Hsync
Hs < 33k
36.2k > Hs > 33k
45k > Hs > 36.2k
52k > Hs > 45k
62k > Hs > 52k
72k > Hs > 62k
Hs > 72k
>15kHz
>15kHz
<15kHz
<15kHz
Hsin
Signal
Table 3: Truth table of Frequency discriminator
>30Hz
<30Hz
>30Hz
<30Hz
Vsin
Weltrend Semiconductor, Inc.
F33K F36.2K F45K
1
0
0
0
0
0
0
Negative polarity Hsin Negative polarity Vsin
Negative polarity Hsin Low state
Low state
Low state
2F., No. 24, Industry E. 9th Rd.
Science-Based Industrial Park
Hsin-Chu, Taiwan, R.O.C.
Tel: [phone]
Fax: [phone]
H_out
Table 4:
1
1
0
0
0
0
0
1
1
1
0
0
0
0
F52K
Negative polarity Vsin
Low state
1
1
1
1
0
0
0
F62K
V_out
1
1
1
1
1
0
0
WT8043
F72K
1
1
1
1
1
1
0
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