CXA1785 Просмотр технического описания (PDF) - Sony Semiconductor
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CXA1785 Datasheet PDF : 29 Pages
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CXA1785AR
Item
Symbol
Conditions
Min. Typ.
Amount of image quality Gp5 SW5→a, SW46→ON
14.0 17.0
adjustment variation
Input SG2 (100 kHz) to (A) and adjust V42
(Y/C input, Y/color
Gp6 so that the amplitude of the sine wave at
1.0
difference input)
TP22 is 0.5 VP-P. With SG2 at 1.8 MHz,
Gp5 and Gp6 are the amount of change in
the output amplitude at TP22 when V48 = 2
V and 3 V.
Trap attenuation
Gtf Input SG3 (100 kHz/3.58 MHz, 0 dB) to (A)
- 45
(NTSC)
(NT) and measure the output level at TP1 for
3.58 MHz to 100 kHz.
Trap attenuation (PAL)
Gtf SW13→a
- 45
(PAL) Input SG3 (100 kHz/4.43 MHz, 0 dB) to (A)
and measure the output level at TP1 for
4.43 MHz to 100 kHz.
DC regeneration ratio
K Input SG1 (APL = 10%, 0 dB) to (A). V1 is 95
the output amplitude (black-black) at TP22.
Next, input SG1 (APL = 90%, 0 dB). V2 is
the output amplitude (black-black) at TP22.
Chroma Block
K = (V1- |V1 - V2|) × 100/V1
Maximum chroma out- Vcmax1 SW5→b, SW13→a, V6=3.5 V
0.7 0.85
put(composite video
Input SG5 (4.43 MHz, burst/chroma phase =
input PAL)
±135°) to (A) and measure the amplitude of
the chroma signal at TP12.
Maximum chroma out- Vcmax2 SW13→a, V6=3.5 V
0.7 0.85
put (Y/C input PAL)
Input SG5 (4.43 MHz, burst/chroma phase =
±135°) to (B) and measure the amplitude of
the chroma signal at TP12.
ACC characteristics
GA1 SW5→b
0
(composite video input
Input SG5 (0 dB, +6 dB, -25 dB), (burst/
NTSC)
GA2 chroma phase = 180°) to (A). Measure the - 10.0 - 5.0
output amplitude at TP12, labeling the
output corresponding to 0 dB, +6 dB and -25
dB as V0, V1 and V2, respectively.
GA1 = 20log(V1/V0) GA2 = 20log(V2/V0)
ACC characteristics
GA3 SW5→a
0
(Y/C input NTSC)
Input SG5 (0 dB, +6 dB, -25 dB), (burst/
GA4 chroma phase = 180°) to (B). Measure the - 9.0 - 4.0
output amplitude at TP12, labeling the
output corresponding to 0 dB, +6 dB and -25
dB as V0, V1 and V2, respectively.
GA3 = 20log(V1/V0) GA4 = 20log(V2/V0)
Max.
3.0
- 30
- 30
1.2
1.2
2.0
2.0
Unit
dB
%
VP-P
dB
—11—
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