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. Max. Unit
Demodulation relative
θRB SW12A→b, SW13→a
80 90 100
phase (PAL)
Input SG5 (0 dB) to (B) and change the
θGB chroma phase.
230 240 254
θR: Phase in which output amplitude at
TP20 reaches a maximum
deg
θG: Phase in which output amplitude at
TP22 reaches a maximum
θB: Phase in which output amplitude at
TP24 reaches a maximum
θRB = θR – θB θGB = θG – θB
Demodulation output
VCAR (C) = OPEN
- 40 - 30
residual carrier (NTSC) (N) Input SG5 (0 dB) to (B). With V42 = 3.0 V,
adjust the chroma phase so that the
amplitude at TP24 is at a maximum. Using a
spectrum analyzer, measure the 7.15909
MHz component versus the 15.734 kHz
Demodulation output
component of the output at TP24.
VCAR SW12A = b, SW13→a, (C) = OPEN
dB
- 50 - 40
residual carrier (PAL)
(P) Input SG5 (0 dB) to (B). With V42 = 3.0 V,
adjust the chroma phase so that the
amplitude at TP24 is at a maximum. Using a
spectrum analyzer, measure the 8.867238
MHz component versus the 15.625 kHz
component of the output at TP24.
HUE variable range
θ+ Input SG5 (0 dB) to (B).
30 40
Label the phase at which the output
θ– amplitude at TP24 reaches a maximum - 30 - 40
deg
when V13 = 1.8 V as θ1, when V13 = 2.7 V
as θ2, and when V13 = 3.6 V as θ3.
Composite→YC input
θ + = θ1 – θ2, θ – = θ3 – θ2
VthCY SW5→b
1.2 1.4 1.6
switching voltage
Input SG5 (0 dB) to (A) and gradually
increase the voltage V5. Measure the
voltage at which the output at TP12
disappeares.
YC→Composite input VthYC SW5→b
0.7 0.9 1.1
switching voltage
Input SG5 (0 dB) to (A) and gradually lower
V
the voltage V5. Measure the voltage at
which the output at TP12 appeares.
NTSC↔PAL switching VthNP Input SG5 (0 dB, 3.579545 MHz, burst/ 0.4 0.7 1.0
voltage
chroma phase = 180°) to (B) and gradually
lower the voltage V13. Measure the voltage
of V13 at which the output at TP24 ceases.
—14—
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