CXA1785 查看數據表（PDF） - Sony Semiconductor
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CXA1785 Datasheet PDF : 29 Pages
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CXA1785AR
Electrical Characteristics
AC Characteristics
Unless otherwise specified, VCC1 = 4.5 V, VCC2 = 12 V, VEE = GND, Ta = 25°C, SW5→a, SW8→a, SW9→b,
SW10→b, SW12A→a, SW12B→ON, SW13→b, SW20→OFF, SW22→OFF, SW24→OFF SW26→OFF,
SW27→OFF, SW28→OFF, SW31→OFF, SW33→b, SW34→OFF, SW35→OFF, SW38→a, SW46→OFF. V5 =
0 V, V6 = 2.6 V, V13 = 2.7 V, V30 = 3.5 V, V32 = 2.1 V, V42 = 2.25 V, V46 = 1.5 V, V48 = 2.5 V, and VR1=6.8 kΩ
(C): input SG11, (D): input SG7b (4.5 VP-P)
Note) Adjust the burst cleaning coil so that the amplitude of the color difference signal is the same at each 1H
of TP20 when SG5 (4.43 MHz, burst/chroma phase = ±135°) is input to (B) with a standard sample.
Item
Video Block
Video maximum gain
Amount of contrast ad-
justment gain variation
(1)
Amount of contrast ad-
justment gain variation
(2)
AGC amplitude char-
acteristics
AGC detection output
Amount of image qual-
ity adjustment variation
(composite video input,
NTSC)
Amount of image qual-
ity adjustment variation
(composite video input,
PAL)
Symbol
Conditions
Min.
Gmax V42 = 1.2 V, input SG8 (-15 dB) to (A).
33
Measure the ratio between the output
amplitude (white-black) and input amplitude
at TP22.
Gct1 Input SG8 (-14 dB) to (A). V1, V0, and V2 3.0
are the output amplitude (white-black) at
TP22 when V42 is changed to 1.2 V, 2.25 V
Gct2 and 3.3 V.
Gct1 = 20log (V1/V0) Gct2 = 20log (V2/V0)
Va1 Input SG1 (0 dB) to (A) and adjust V42 so 4.6
that TP22 output amplitude (white-black) is
Va2 4 V when APL = 50 %
2.0
Va1 and Va2 are the amplitude at TP22
when APL = 10 % and 90 %.
Vad1 Input SG1 (0 dB) to (A). Vad1, Vad2, and 2.7
Vad2 Vad3 are the voltage at TP47 when APL = 1.1
Vad3 10 %, 50 %, and 90 %.
0.1
Gp1 SW5→b, SW46→ON
6.0
Input SG2 (100 kHz) to (A) and adjust V42
Gp2 so that the amplitude of the sine wave at
TP22 is 0.5 VP-P. Gp1 and Gp2 are the
amount of change in the output amplitude at
TP22 when SG2 is 2.1 MHz and V48 = 2 V
and 3 V.
Gp3 SW5→b, SW13→a, SW46→ON
6.0
Input SG2 (100 kHz) to (A) and adjust V42
Gp4 so that the amplitude of the sine wave at
TP22 is 0.5 VP-P. Gp3 and Gp4 are the
amount of change in the output amplitude at
TP22 when SG2 is 2.4 MHz and V48 = 2 V
and 3 V.
Typ. Max.
36 39
5.5
- 15 - 11
5.6 6.6
2.5 3.0
3.0 3.4
1.7 2.3
0.5 0.9
9.0
- 4.0 - 1.0
9.0
- 4.0 - 1.0
Unit
dB
VP-P
V
dB
—10—
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