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TDA9819T 数据表(PDF) 7 Page - NXP Semiconductors

部件名 TDA9819T
功能描述  Multistandard vision and sound-IF PLL with DVB-IF processing
Download  40 Pages
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制造商  PHILIPS [NXP Semiconductors]
网页  http://www.nxp.com
标志 PHILIPS - NXP Semiconductors

TDA9819T 数据表(HTML) 7 Page - NXP Semiconductors

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1998 Jul 14
7
Philips Semiconductors
Product specification
Multistandard vision and sound-IF PLL with
DVB-IF processing
TDA9819
SIF amplifier and AGC
The sound IF amplifier consists of two AC-coupled
differential amplifier stages. Each differential stage
comprises a controlled feedback network provided by
emitter degeneration.
The SIF AGC detector is related to the SIF input signals
(average level of AM or FM carriers) and controls the SIF
amplifier to provide a constant SIF signal to the AM
demodulator and single reference QSS mixer. The SIF
AGC reaction time is set to ‘slow’ for nominal video
conditions. But with a decreasing VIF amplitude step the
SIF AGC is set to ‘fast’ mode controlled by the VIF AGC
detector. In FM mode this reaction time is also set to ‘fast’
controlled by the standard switch.
Single reference QSS mixer
The single reference QSS mixer is realized by a multiplier.
The SIF amplifier output signal is fed to the single
reference QSS mixer and converted to intercarrier
frequency by the regenerated picture carrier (VCO).
The mixer output signal is fed via a high-pass for
attenuation of the video signal components to the output
pin 20. With this system a high performance hi-fi stereo
sound processing can be achieved.
For a simplified application without a sound-IF SAW filter
the single reference QSS mixer can be switched to the
intercarrier mode by connecting pins 31 and 32 to ground
(see note 18 of Chapter “Characteristics”).
In this mode the sound-IF passes the VIF SAW filter and
the composite IF signal is fed to the single reference QSS
mixer. This IF signal is multiplied by the 90
° TWD output
signal for converting the sound-IF to intercarrier frequency.
By using this quadrature detection, the low frequency
video signals are removed.
Due to the sound-IF attenuation in the VIF filter (sound
shelf), the audio signal-to-noise (S/N) figure decreases.
AM demodulator
The AM demodulator (French L standard) is realized by a
multiplier. The modulated SIF amplifier output signal is
multiplied in phase with the limited (AM is removed)
SIF amplifier output signal. The demodulator output signal
is fed via an integrated low-pass filter for attenuation of the
carrier harmonics to the AF amplifier.
FM detector
The FM detector consists of a limiter, an FM-PLL and an
AF amplifier. The limiter provides the amplification and
limitation of the FM sound intercarrier signal before
demodulation. The result is high sensitivity and AM
suppression. The amplifier consists of 7 stages which are
internally AC-coupled in order to minimize the DC offset
and to save pins for DC decoupling.
The FM-PLL consists of an integrated relaxation oscillator,
an integrated loop filter and a phase detector.
The oscillator is locked to the FM intercarrier signal, output
from the limiter. As a result of locking, the oscillator
frequency tracks with the modulation of the input signal
and the oscillator control voltage is superimposed by the
AF voltage. The FM-PLL operates as an FM-demodulator.
The AF amplifier consists of two parts:
1. The AF preamplifier for FM sound is an operational
amplifier with internal feedback, high gain and high
common mode rejection. The AF voltage from the PLL
demodulator, by principle a small output signal, is
amplified by approximately 30 dB. The low-pass
characteristic of the amplifier reduces the harmonics of
the intercarrier signal at the sound output terminal.
An additional DC control circuit is implemented to keep
the DC level constant, independent of process spread.
2. The AF output amplifier (10 dB) provides the required
output level by a rail-to-rail output stage. This amplifier
makes use of an input selector for switching to AM/FM
or mute state, controlled by the standard switching
voltage and the mute switching voltage.
Internal voltage stabilizer and 1
2VP reference
The band gap circuit internally generates a voltage of
approximately 1.25 V, independent of supply voltage and
temperature. A voltage regulator circuit, connected to this
voltage, produces a constant voltage of 3.6 V which is
used as an internal reference voltage.
For all audio output signals the constant reference voltage
cannot be used because large output signals are required.
Therefore these signals refer to half the supply voltage to
achieve a symmetrical headroom, especially for the
rail-to-rail output stage. For ripple and noise attenuation
the 1
2VP voltage has to be filtered via a low-pass filter by
using an external capacitor together with an integrated
resistor (fg = 5 Hz). For a fast setting to 12VP an internal
start-up circuit is added.


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