Read Sharp 66GS-62 (serv.man9) Service Manual online
22
66GS-62H
Notes
1. Values of video and sound parameters can be decreased at V
P
= 4.75 V.
2. Condition: luminance range (4 steps) 0 to 80%.
3. The sound carrier frequencies (depending on TV standard) are attenuated by the integrated sound carrier traps
(see Figs 16 to 21;
H (s)
is the absolute value of transfer function).
4. S/N is the ratio of black-to-white amplitude to the black level noise voltage (RMS value, pin 17). B = 5 MHz weighted
in accordance with
“CCIR 567”.
5. The intercarrier output signal at pin 12 can be calculated by the following formula taking into account the internal
video signal with 1.1 V (p-p) as a reference:
where:
= correction term for RMS value,
= sound-to-picture carrier ratio at VIF input (pins 1 and 2) in dB,
6 dB = correction term of internal circuitry and
±
3 dB = tolerance of video output and intercarrier output amplitude
V
o(intc)(rms)
.
6. The reference input pin 15 is able to operate as a 1-pin crystal oscillator as well as input terminal with external
reference signal, e.g. from the tuning system.
B
AF(
−
3dB)
−
3 dB audio frequency bandwidth for
FM
without de-emphasis;
dependent on loop filter at
pin 4
dependent on loop filter at
pin 4
80
100
−
kHz
S/N
W(audio)
weighted signal-to-noise ratio of
audio signal
audio signal
27 kHz FM deviation;
50
50
µ
s de-emphasis;
vision carrier unmodulated
52
56
−
dB
AM; m = 54%
45
50
−
dB
α
AM(sup)
AM suppression of FM demodulator
50
µ
s de-emphasis;
AM: f = 1 kHz; m = 0.54
referenced to 27 kHz
FM deviation
referenced to 27 kHz
FM deviation
40
46
−
dB
PSRR
8(AM)
power supply ripple rejection at pin 8
f
ripple
= 70 Hz; see Fig.8
20
26
−
dB
PSRR
8(FM)
power supply ripple rejection at pin 8
f
ripple
= 70 Hz; see Fig.8
14
20
−
dB
V
o(rms)
IF intercarrier level (RMS value),
valid also for radio
valid also for radio
QSS mode; SC
1
; sound
carrier 2 off
90
140
180
mV
L standard; without
modulation
modulation
90
140
180
mV
intercarrier mode; SC
1
;
sound carrier 2 off
−
note 5
−
mV
f
ref
frequency of reference signal at
pin 15
pin 15
note 6
−
4
−
MHz
V
ref(rms)
amplitude of reference signal source
(RMS value)
(RMS value)
operation as input terminal
80
−
400
mV
SYMBOL
PARAMETER
CONDITIONS
MIN.
TYP.
MAX.
UNIT
V
o(intc)(rms)
1.1 V (p-p)
1
2 2
-----------
×
10
V
i SC
(
)
V
i PC
(
)
--------------- dB
(
)
6 dB
3 dB
±
+
20
----------------------------------------------------------------
×
=
1
2 2
-----------
V
i SC
(
)
V
i PC
(
)
--------------- dB
(
)
ICs ADITIONAL INFORMATION: TDA9885 (IC201)
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