Sharp 70GS-61S - Video

22
70GS-61S
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
80 100 − kHz
S/N
W(audio)
weighted signal-to-noise ratio of
audio signal
27 kHz FM deviation;
50 µs de-emphasis;
vision carrier unmodulated
52 56 − dB
AM; m = 54% 45 50 − dB
α
AM(sup)
AM suppression of FM demodulator 50 µs de-emphasis;
AM: f = 1 kHz; m = 0.54
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
QSS mode; SC
1
; sound
carrier 2 off
90 140 180 mV
L standard; without
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
note 6 − 4 − MHz
V
ref(rms)
amplitude of reference signal source
(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
22
-----------
× 10
V
iSC()
V
iPC()
---------------
dB()6 dB 3 dB±+
20
----------------------------------------------------------------
×=
1
22
-----------
V
iSC()
V
iPC()
---------------
dB()
ICs ADITIONAL INFORMATION: TDA9886 (IC201)