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PDF TDA3866 Data sheet ( Hoja de datos )
| Número de pieza | TDA3866 | |
| Descripción | Quasi-split sound processor for all standards | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
TDA3866
Quasi-split sound processor for all
standards
Preliminary specification
File under Integrated Circuits, IC02
January 1992
1 page  
Philips Semiconductors
Quasi-split sound processor for all standards
Preliminary specification
TDA3866
FUNCTIONAL DESCRIPTION
The quasi-split sound processor is for
all standards. Dependent on the
voltage on pin 5 either FM mode
(B/G) or AM mode (L) is selected.
B/G standard (FM mode):
Pins 23 and 24 are active, AGC
detector uses peak sync level. Sound
carrier SC1 (5.5 MHz) provides AF1,
sound carrier SC2 (5.74 MHz)
provides AF2. With no sound carrier
SC2 on pin 19, AF2 output is muted
(in mid-position of the standard select
switch FM mode without muting of
AF2 is selected).
The mute circuit prevents false signal
recognition in the stereo decoder at
high IF signal levels when no second
sound carrier exists (mono) and an
AF signal is present in the
identification signal frequency range.
With 1 mV on pin 19, under
measurement conditions, AF2 is
switched on (see limiting amplifier).
Weak input signals at pins 23 and 24
generate noise on pin 19, which is
present in the intercarrier signal and
passes through the 5.74 MHz filter.
Noise on pin 19 inhibits muting. No
misinterpretation due to white noise
occurs in the stereo decoder; when
non-correlated noise masks the
identification signal frequencies,
which may be present in sustained
tone signals. The stereo decoder
remains switched to mono.
The series capacitor Cs in 38.9 MHz
resonant circuit provides a notch at
the sound carrier frequency in order
to provide more attenuation for the
sound carrier in the vision carrier
reference channel. The ratio of
parallel/series capacitor depends on
the ratio of VC/SC frequency and has
to be adapted to other TV
transmission standards if necessary,
according to the formula
CS = CP (fVC/fSC)2 − CP.
The result is an improved “intercarrier
buzz” (up to 10 dB improvement in
sound channel 2 with 250 kHz video
modulation for B/G stereo) or
suppression of 350 kHz video
modulated beat frequency in the
digitally-modulated NICAM
subcarrier.
The picture carrier for quadrature
demodulation in the intercarrier mixer
is not exactly 90 degrees due to the
shift variation in the integrated phase
shift network. The tuning of the LC
reference circuit to provide optimal
video suppression at the intercarrier
output is not the same as that to
provide optimal intercarrier buzz
suppression. In order to optimize the
AF signal performance, a fine tuning
for the optimal S/N at the sound
channel 2 (from 5.74 MHz) may be
performed with a 250 kHz square
wave video modulation.
Measurements at the demodulators:
For all signal-to-noise measurements
the generator must meet the following
specifications;
phase modulation errors < 0.5 degree
for B/W-jumps intercarrier
signal-to-noise ratio as measured
with “TV-demodulator AMF2”
(weighted S/N) must be > 60 dB at
6 kHz sine wave modulation of the
B/W-signal.
Signal-to-noise ratios are measured
with ∆f = ±50 kHz deviation and
fmod = 1 kHz; with a deviation
of ±27 kHz the S/N ratio is
deteriorated by 5.3 dB.
L standard (AM mode): Pins 1 and 2
are active, AGC detector uses mean
signal level. The audio signal from the
AM demodulator is output on AF1,
with AF2 output muted.
January 1992
5
5 Page 
Philips Semiconductors
Quasi-split sound processor for all standards
Preliminary specification
TDA3866
Fig.3 Test and application circuit for standards B/G and L (for application SAW-filters must be used).
January 1992
11
11 Page | ||
| Páginas | Total 16 Páginas | |
| PDF Descargar | [ Datasheet TDA3866.PDF ] | |
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