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PDF TDA9884TS Data sheet ( Hoja de datos )
| Número de pieza | TDA9884TS | |
| Descripción | I2C-bus controlled multistandard alignment-free IF-PLL | |
| Fabricantes | NXP Semiconductors | |
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INTEGRATED CIRCUITS
DATA SHEET
www.DataSheet4U.com
TDA9884TS
I2C-bus controlled multistandard
alignment-free IF-PLL for mobile
reception
Product specification
2003 Nov 28
1 page  
Philips Semiconductors
I2C-bus controlled multistandard alignment-free
IF-PLL for mobile reception
Product specification
TDA9884TS
SYMBOL
PARAMETER
CONDITIONS
MIN. TYP. MAX. UNIT
Audio part
Vo(AF)(rms)
THD
AF output voltage (RMS value)
total harmonic distortion of audio
signal
BAF(−3dB)
−3 dB AF bandwidth
www.DSa/tNaWSh(AeFe)t4U.com weighted signal-to-noise ratio of
audio signal
αAM(sup)
AM suppression of
FM demodulator
PSRRAUD
Vo(intc)(rms)
power supply ripple rejection on
pin AUD
IF intercarrier output level
(RMS value)
27 kHz FM deviation;
50 µs de-emphasis
FM: 27 kHz FM deviation;
50 µs de-emphasis
AM: m = 54 %
without de-emphasis;
dependent on FM-PLL filter
FM: 27 kHz FM deviation;
50 µs de-emphasis;
vision carrier unmodulated
AM: m = 54 %
50 µs de-emphasis;
AM: f = 1 kHz and
m = 54 %; referenced to
27 kHz FM deviation
fripple = 70 Hz; see Fig.7
for AM
for FM
QSS mode; SC1; SC2 off
L standard;
without modulation
intercarrier mode;
PC/SC1 = 20 dB; SC2 off;
note 6
430
−
−
80
52
45
40
20
14
90
90
−
540 650 mV
0.15 0.50 %
0.5 1.0
100 −
%
kHz
56 −
dB
50 −
46 −
dB
dB
26 −
dB
20 −
dB
140 180 mV
140 180 mV
75 −
mV
Reference frequency
fref
Vref(rms)
reference signal frequency
reference signal voltage
(RMS value)
note 7
−
operation as input terminal 80
4
−
− MHz
400 mV
Notes
1. Values of video and sound parameters can be decreased at VP = 4.5 V.
2. For applications without I2C-bus, the time constant (R × C) at the supply must be >1.2 µs (e.g. 1 Ω and 2.2 µF).
3. Condition: luminance range (5 steps) from 0 % to 100 %.
4. AC load: CL < 20 pF and RL > 1 kΩ. The sound carrier frequencies (depending on the TV standard) are attenuated
by the integrated sound carrier traps (see Figs 15 to 20; H (s) is the absolute value of transfer function).
5. S/NW is the ratio of the black-to-white amplitude to the black level noise voltage (RMS value measured on pin CVBS).
B = 5 MHz weighted in accordance with “CCIR 567”.
2003 Nov 28
5
5 Page 
Philips Semiconductors
I2C-bus controlled multistandard alignment-free
IF-PLL for mobile reception
Product specification
TDA9884TS
7.10 SIF-AGC detector
SIF gain control is performed by the detection of the
DC component of the AM demodulator output signal. This
DC signal corresponds directly to the SIF voltage at the
output of the SIF amplifier so that a constant SIF signal is
supplied to the AM demodulator and to the single
reference QSS mixer.
By switching the gain of the input amplifier of the SIF-AGC
detector via the I2C-bus, the internal SIF level for
FM sound is 5.5 dB lower than for AM sound. This is to
adapt the SIF-AGC characteristic to the VIF-AGC
www.cDhaataraSchteeerits4tUic.c. oTmhe adaption is ideal for a picture-to-sound
FM carrier ratio of 13 dB.
Via a comparator, the integrated AGC capacitor is charged
or discharged for the generation of the required SIF gain.
Due to AM sound, the AGC reaction time is slow
(fc < 20 Hz for the closed AGC loop). For reducing this
AM sound time constant in the event of a decreasing
IF amplitude step, the charging and discharging currents
of the AGC capacitor are increased by a factor of 12 (fast
mode) when the VIF-AGC detector (at positive modulation
mode) operates in the fast mode too. An additional circuit
(threshold approximately 7 dB) ensures a very fast gain
reduction for a large increasing IF amplitude step.
For negative modulation and QSS mode the AGC also is
set to fast mode. For negative modulation and mobile
mode the currents are increased additionally by a factor
of 36.
7.11 Single reference QSS mixer
With the present system a high performance Hi-Fi stereo
sound processing can be achieved. For a simplified
application without a SIF SAW filter, the single reference
QSS mixer can be switched to the intercarrier mode via the
I2C-bus.
The single reference QSS mixer generates the 2nd FM
TV sound intercarrier signal. It is realized by a linear
multiplier which multiplies the SIF amplifier output signal
and the VIF-PLL VCO signal (90 degrees output) which is
locked to the picture carrier. In this way the QSS mixer
operates as a quadrature mixer in the intercarrier mode
and provides suppression of the low frequency video
signals.
In the true split sound mode the VIF-PLL VCO is locked by
a synthesizer. By this the 2nd FM TV sound intercarrier
signal is generated independently from the vision carrier
so that in the case of a low RF level, the sound
demodulation is possible where the VIF-PLL would unlock.
In the true split sound mode the VIF demodulation is not
available.
The QSS mixer output signal is fed internally via a
high-pass and low-pass combination to the
FM demodulator as well as via an operational amplifier to
the intercarrier output pin SIOMAD.
7.12 AM demodulator
The amplitude modulated SIF amplifier output signal is fed
both to a two-stage limiting amplifier that removes the AM
and to a linear multiplier. The result of the multiplication of
the SIF signal with the limiter output signal is
AM demodulation (passive synchronous demodulator).
The demodulator output signal is fed via a low-pass filter
that attenuates the carrier harmonics and via the input
amplifier of the SIF-AGC detector to the audio amplifier.
7.13 FM demodulator and acquisition help
The narrow-band FM-PLL detector consists of:
• Gain controlled FM amplifier and AGC detector
• Narrow-band PLL.
The intercarrier signal from the intercarrier mixer is fed to
the input of an AC-coupled gain controlled amplifier with
two stages. The gain controlled output signal is fed to the
phase detector of the narrow-band FM-PLL
(FM demodulator). For good selectivity and robustness
against disturbance caused by the video signal, a high
linearity of the gain controlled FM amplifier and of the
phase detector as well as a constant signal level are
required. The gain control is done by means of an ‘in
phase’ demodulator for the FM carrier (from the output of
the FM amplifier). The demodulation output is fed into a
comparator for charging or discharging the integrated
AGC capacitor. This leads to a mean value AGC loop to
control the gain of the FM amplifier.
The FM demodulator is realized as a narrow-band PLL
with an external loop filter, which provides the necessary
selectivity (bandwidth approximately 100 kHz). To achieve
good selectivity, a linear phase detector and a constant
input level are required. The gain controlled intercarrier
signal from the FM amplifier is fed to the phase detector.
The phase detector controls via the loop filter the
integrated low radiation relaxation oscillator. The designed
frequency range is from 4 to 7 MHz.
2003 Nov 28
11
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