M52778SP View Datasheet(PDF) - MITSUBISHI ELECTRIC
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M52778SP Datasheet PDF : 37 Pages
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MITSUBISHI ICs (TV)
M52778SP
VIF, SIF, VIDEO, CHROMA, DEFLECTION FOR PAL/NTSC
θR-Y N Demodulation phase
1. Input VS3N (eb=single chroma=ec+50kHz) to VI IN.
2. V41 is the output amplitude at pin 41.
3. V43 is the output amplitude at pin 43.
4. R-YN is defined as follows:
θR-YN=tan-1 V43×3.8 +45 (deg)
V41×1.9
TC1 Tint control 1, TC2 Tint control 2
1. Input VS3N (see the following figure) to VI IN. Based on the
output voltage at pin 41, find the absolute angle as shown in the
following figure.
-180°
0°
90°
AUTO1 to 6 System identification1 to 6
Set to AUTO mode and confirm that bus for each output signal is
read correctly.
Ymax Maximum video output
1. Input SGA to VI IN
2. Measure the amplitude (P-P) except that at blanking part of
output at pins 21, 22 and 23.
M
GY Video gain
1. Input SGA to VI IN
2. Measure the amplitude (P-P) except that at blanking part of
output at pins 21, 22 and 23. This amplitude is defined as G1.
A
B
M =G1
90°
A
B
θ
GND
0°
3. GY is defined as follows:
GY=20 log (G1VP-P/0.714VP-P) (dB)
BW Video frequency characteristics
1. Input SGB (5MHz, 0.4VP-P) to VI IN.
2. Measure the amplitude (P-P) except that at blanking part of the
output at pin 22. The amplitude is defined as YB.
3. BW is defined as follow:
BW=20 log (YB VP-P /GY VP-P) (dB)
θ=tan-1 (B/A)
2AGY Pin38 output amplitude
1. Input SGA to VI IN.
2. Measure the amplitude (P-P) at pin 38 output.
2. TC is defined as the angle when tint data is center (63).
TCmax is the angle when tint data is max,and TCmin is the
angle when tint data is min.
TC1=TCMAX-TC (deg)
TC2=TC-TCMIN (deg)
SRA SECAM REF output amplitude
SRD SECAM REF output DC voltage
Measure the amplitude (SRA) and DC voltage (SRD) of the element
of 4.43MHz of output at pin 42.
CTR1 Chroma trap attenuation 1 (common to R/G/B output)
1. Input SS3N to VI IN. Measure the frequency level of 3.58MHz at
trap data 0. The level is defined as N0.
2. Then, measure the level at trap data 1.
3. CTR1 is defined as follows.
CTR1=20log
Measured value (mVP-P)
N0 (mVP-P)
(dB)
14
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