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부품번호 TDA9816M 기능
기능 Multistandard multimedia IF-PLL and FM radio demodulator
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TDA9816M 데이터시트, 핀배열, 회로
INTEGRATED CIRCUITS
DATA SHEET
TDA9816M
Multistandard multimedia IF-PLL
and FM radio demodulator
Preliminary specification
File under Integrated Circuits, IC02
1997 Nov 19




TDA9816M pdf, 반도체, 판매, 대치품
Philips Semiconductors
Multistandard multimedia IF-PLL and FM
radio demodulator
BLOCK DIAGRAM
Preliminary specification
TDA9816M
ok, full pagewidth
1997 Nov 19
4

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TDA9816M 전자부품, 판매, 대치품
Philips Semiconductors
Multistandard multimedia IF-PLL and FM
radio demodulator
Preliminary specification
TDA9816M
The standard-dependent level shift in this stage delivers
the same sync level for positive and negative modulation.
The video output signal at Vo(vid) is 1.1 V (p-p) for nominal
vision IF modulation, in order to achieve 1 V (p-p) at the
sound trap output.
SIF amplifier and AGC
The sound IF amplifier consists of two AC-coupled
differential amplifier stages. Each differential stage is
comprised of 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). It controls the SIF
amplifier to provide a constant SIF signal to the
AM demodulator and single reference QSS mixer.
The 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’
mode according to the TV standard.
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 the intercarrier
frequency by the regenerated picture carrier (VCO).
The mixer output signal is fed, via a high-pass filter used
to attenuate the video signal components, to output pin 14.
High performance hi-fi stereo sound processing can be
achieved with this system.
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 27 and/or pin 28 to
ground. In this mode, the sound IF signal passes through
the vision IF SAW filter and the composite IF signal is then
fed to the single reference QSS mixer. Here, the IF signal
is multiplied by the 90° TWD output signal to convert the
sound IF to the intercarrier frequency. By using this
quadrature detection, the low frequency video signals are
removed.
AM demodulator
A multiplier is used for AM demodulation. The modulated
SIF amplifier output signal and the ‘in-phase’ limited
(AM is removed) SIF amplifier output signal are multiplied
together. The demodulated output signal is fed, via an
integrated low-pass filter used to attenuate the carrier
harmonics, to the AF amplifier.
RIF amplifier and AGC
The radio IF amplifier amplifies the 10.7 MHz radio IF
signal. This signal is supplied by the tuner and is fed to the
RIF input (pin 4) via a matching circuit and a ceramic
band-pass filter. This amplifier contains two stages.
The first stage, a conventional 0 dB differential amplifier
designed for optimal dynamic range, is followed by a
switchable differential amplifier stage with a gain of 10 dB.
Either the radio IF or to the TV IF signal can be selected at
the output (pin 14).
The RIF output signal is fed via ceramic band-pass filters
to the FM-PLL demodulator and the radio IF AGC detector.
The AGC threshold is very high and is designed to obtain
some adjacent channel protection. The AGC detector
output is fed to the tuner AGC output stage (pin 16) to
control the tuner.
FM-PLL demodulator level detector and radio AFC
The FM-PLL demodulator consists of a limiter and an FM
phase-locked loop. The 8-stage internally AC-coupled
limiter amplifies and limits the TV FM sound intercarrier or
the radio FM intermediate frequency signal prior to
demodulation. The limiter is designed for high sensitivity
and AM suppression with low DC offset and needs no
external pins for DC coupling.
Furthermore, the AF output signal can be force muted by
connecting a resistor between pin 15 and ground. The soft
mute function can be disabled by connecting a resistor
between pin 15 and the power supply. See the application
circuit in Fig.18.
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 on the
AF voltage. The FM-PLL operates as an FM demodulator.
The level detector detects, rectifies and amplifies the
output signals from the first 5 limiter stages. These signals
are then summed and the composite signal passed
through a low-pass filter, followed by a 6 dB output
amplifier. A DC voltage dependent on the limiter input level
is generated for controlling the behaviour of the AF soft
mute. The 6 dB output amplifier can be switched off via the
control logic and the level detector output signal fed to
pin 19. Furthermore, the steepness of the level detector
output signal tracks that of the power supply voltage.
1997 Nov 19
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부품번호상세설명 및 기능제조사
TDA9816M

Multistandard multimedia IF-PLL and FM radio demodulator

NXP Semiconductors
NXP Semiconductors

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