參數(shù)資料
型號(hào)： TA1370FG
廠商： Toshiba Corporation
英文描述： MINIATURE POWER RELAY
中文描述： 同步處理器，頻率計(jì)數(shù)器集成電路電視分量信號(hào)
文件頁數(shù)： 40/42頁
文件大?。?/td> 637K
代理商： TA1370FG
TA1370FG
2003-02-19
40
Application Circuit 2
(How to measure H/V frequency)
To measure H/V frequency of signal 2 (fH2: unknown) correctly, use two separated input terminals as the
following figure. One is for frequency measuring (SYNC2-in) and the other is for the AFC (SYNC1-IN). And
measure H/V frequency of signal 2 (fH2: unknown) on condition that AFC is stable (AFC locks in signal 1 (fH1:
known).) or that AFC is free-run when SYNC1-IN is no-signal.
This IC’s H/V frequency counting is done by internal pulse (A) which is made in AFC circuit. So, if AFC circuit
doesn’t lock in the regular frequency, the frequency of pulse (A) will not be correct and the H/V frequency data will
not be showed correct data.
Decision algorithm of H/V frequency detection (detection range, detection times and so on) should be determined
under consideration the factors such as signal strength, existence of ghost signal, H-AFC stability, I
2
C BUS data
transmission and so on via prototype TV set evaluation.
H/V FREQ
COUNTER
AFC
Internal pulse (A)
Signal 1
Signal 2
BUS READ
Signal 1
(fH1: known)
Signal 2
(fH2: unknown)
SYNC1-IN
for H-AFC
SYNC2-IN
for
H/V freq. counter
TA1370FG
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