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CXA1645P Datasheet(PDF) 11 Page - Sony Corporation

Part No. CXA1645P
Description  RGB Encoder
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Maker  SONY [Sony Corporation]
Homepage  http://www.sony.co.jp
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CXA1645P/M
Description of Operation
Analog RGB signals input from Pins 2, 3 and 4 are clamped in the clamping circuit and output from Pins 23,
22 and 21, respectively.
The matrix circuit performs operations on each input signal, generating luminance signal Y and color
difference signals R-Y and B-Y. The Y signal enters the delay line to adjust delay time with the color signal C.
Then, after addition of the CSYNC signal input from Pin 10, the Y signal is output from Pin 16.
A subcarrier input from Pin 6 is input to the phase shifter, where its phase is sfited 90°. Then, the subcarrier
is input to the modulators and modulated by the R-Y signal and the B-Y signal. Modulated subcarriers are
mixed, sent to the band pass filter to eliminate higher harmonic components and finally output from Pin 15 as
the C signal. At the same time, Y and C signals are mixed and output from Pin 20 as the composite video
signal.
Burst Signal
The CXA1645P/M generates burst signals at the timing shown below according to the composite sync signal
input.
H synchronization
V synchronization
Burst signal
tD (B)
tW (B)
tD (B)
tW (B)
SYNC
IN
(TTL level)
C VIDEO
OUT
COUT
Burst signal
Synchronizing signal
SYNC
IN
C VIDEO
OUT
ODD
EVEN
ODD
EVEN




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