TDA9815 datasheet(7/40 Pages) PHILIPS

Nome de Peças	TDA9815

Descrição Electrónicos	Multistandard/MAC VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator

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Fabricante Electrônico	PHILIPS [NXP Semiconductors]

Página de início	http://www.nxp.com

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7 / 40 page

1998 Feb 11

7

Philips Semiconductors

Product speciﬁcation

Multistandard/MAC VIF-PLL with QSS-IF

and dual FM-PLL/AM demodulator

TDA9815

The demodulator output signal is fed via an integrated

low-pass filter for attenuation of the carrier harmonics to

the video amplifier. The video amplifier is realized by an

operational amplifier with internal feedback and high

bandwidth. A low-pass filter is integrated to achieve an

attenuation of the carrier harmonics for B/G and

L standard. The standard dependent level shift in this

stage delivers the same sync level for positive and

negative modulation. The video output signal is 1 V (p-p)

for nominal vision IF modulation.

Video buffer

For an easy adaption of the sound traps an operational

amplifier with internal feedback is used in the event of B/G

and L standard. This amplifier is featured with a high

bandwidth and 7 dB gain. The input impedance is adapted

for operating in combination with ceramic sound traps. The

output stage delivers a nominal 2 V (p-p) positive video

signal. Noise clipping is provided.

For MAC standard a second buffer amplifier with 6 dB gain

is used. This buffer amplifier is selected by the standard

switch.

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.

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.

FM-PLL demodulator

Each FM-PLL demodulator 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.

At the input of one limiter a signal switch is available for

selecting one of the two intercarrier signals. Controlled by

the voltage at pin 11, either the input pin 17 or pin 18 is

active for handling different intercarrier frequencies.

The other limiter is extended with an additional level

detector consisting of a rectifier and a comparator. By

means of this the AF2 signal is set to mute and the

PLL VCO is switched off, if the intercarrier signal at pin 16

is below 1 mV (RMS) in order to avoid false identification

of a stereo decoder. Note that noise at pin 16 disables the

mute state (at low SIF input signal), but this will not lead to

false identification. This ‘auto-mute’ function can be

disabled by connecting a 5.6 k

Ω resistor from pin 16 to V

P

(see Fig.13).

Furthermore the AF output signals can be muted by

connecting a resistor between the limiter inputs pin 16 or

pin 17 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.

Nº de peça semelhante - TDA9815

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NXP Semiconductors	TDA9810	225Kb / 32P	Multistandard VIF-PLL with QSS-IF and AM demodulator 1999 May 07
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	TDA9811	228Kb / 36P	Multistandard VIF-PLL with QSS-IF and AM demodulator 1998 Feb 09
	TDA9812	272Kb / 32P	Multistandard VIF-PLL and FM-PLL/AM demodulator 1995 Mar 21
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Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
NXP Semiconductors	TDA9814T	249Kb / 36P	Multistandard VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator 1998 Feb 09
	TDA9811	228Kb / 36P	Multistandard VIF-PLL with QSS-IF and AM demodulator 1998 Feb 09
	TDA9810	225Kb / 32P	Multistandard VIF-PLL with QSS-IF and AM demodulator 1999 May 07
	TDA9813T	160Kb / 32P	VIF-PLL with QSS-IF and dual FM-PLL demodulator 1999 Sep 16
	TDA9812	272Kb / 32P	Multistandard VIF-PLL and FM-PLL/AM demodulator 1995 Mar 21
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	TDA9817	240Kb / 41P	Single/multistandard VIF/SIF-PLL and FM-PLL/AM demodulators 2004 Jun 29
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