TA1383AFG Datasheet, PDF (45/47 Pages) Toshiba Semiconductor – NTSC Chroma Decoder, Multi-Point Scan Sync Processor, H/V Frequency Counter IC for Color TV

Application Circuit 2 (How to measure H/V frequency)
TA1383AFG
16
C1-IN
19
C2-IN
APC
Internal pulse (A)
D-SYNC2-IN
(for H/V freq.
counter)
6
TA1383
FREQ
COUNTER
BUS READ
This IC’s H/V frequency counting is done by internal pulse (A) which is made in APC circuit. So, if APC 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, APC stability, I²C BUS data
transmission and so on via prototype TV set evaluation.
45
2005-09-05