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TDA9817 데이터시트 PDF




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부품번호 TDA9817 기능
기능 Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators
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TDA9817 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
TDA9817; TDA9818
Single/multistandard VIF/SIF-PLL
and FM-PLL/AM demodulators
Preliminary specification
File under Integrated Circuits, IC02
1997 May 12




TDA9817 pdf, 반도체, 판매, 대치품
Philips Semiconductors
Single/multistandard VIF/SIF-PLL and
FM-PLL/AM demodulators
BLOCK DIAGRAM
Preliminary specification
TDA9817; TDA9818
1997 May 12
4

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TDA9817 전자부품, 판매, 대치품
Philips Semiconductors
Single/multistandard VIF/SIF-PLL and
FM-PLL/AM demodulators
Preliminary specification
TDA9817; TDA9818
SIF amplifier and SIF 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 signal
(average level of AM or FM carrier) and controls the SIF
amplifier to provide a constant SIF signal to the
AM demodulator and single reference QSS mixer.
At L standard (AM sound) 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 always ‘fast’.
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 12. 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 pin 24 to ground. In this
mode the sound IF passes the vision IF SAW filter and the
composite IF signal is fed to the single reference QSS
mixer. This IF signal is multiplied with the 90 degree TWD
output signal for converting the sound IF to intercarrier
frequency. This composite intercarrier signal is fed to the
output pin 12, too. By using this quadrature detection, the
low frequency video signals are removed.
AM demodulator
The AM demodulator 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.
consists of 7 stages which are internally AC-coupled in
order to minimize the DC offset.
Furthermore the AF output signal can be muted by
connecting a resistor between the limiter input pin 13 and
ground.
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.
AF signal processing
The AF amplifier consists of two parts:
1. The AF pre-amplifier 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 33 dB. The low-pass
characteristic of the amplifier reduces the harmonics of
the intercarrier signal at the sound output terminal
pin 9 at which the de-emphasis network for FM sound
is applied. 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
de-emphasis or mute state, controlled by the standard
switching voltage and the mute switching voltage.
Internal voltage stabilizer
The bandgap 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.
FM-PLL demodulator
The FM-PLL demodulator consists of a limiter and an
FM-PLL. The limiter provides the amplification and
limitation of the FM sound intercarrier signal. The result is
high sensitivity and AM suppression. The amplifier
1997 May 12
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