Motore di ricerca datesheet componenti elettronici
  Italian  ▼
ALLDATASHEETIT.COM

X  

TDA9882 Scheda tecnica(PDF) 11 Page - NXP Semiconductors

Il numero della parte TDA9882
Spiegazioni elettronici  Alignment-free multistandard vision and QSS FM sound IF PLL demodulator
Download  45 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Produttore elettronici  NXP [NXP Semiconductors]
Homepage  http://www.nxp.com
Logo NXP - NXP Semiconductors

TDA9882 Scheda tecnica(HTML) 11 Page - NXP Semiconductors

Back Button TDA9882 Datasheet HTML 7Page - NXP Semiconductors TDA9882 Datasheet HTML 8Page - NXP Semiconductors TDA9882 Datasheet HTML 9Page - NXP Semiconductors TDA9882 Datasheet HTML 10Page - NXP Semiconductors TDA9882 Datasheet HTML 11Page - NXP Semiconductors TDA9882 Datasheet HTML 12Page - NXP Semiconductors TDA9882 Datasheet HTML 13Page - NXP Semiconductors TDA9882 Datasheet HTML 14Page - NXP Semiconductors TDA9882 Datasheet HTML 15Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 11 / 45 page
background image
9397 750 13507
© Koninklijke Philips Electronics N.V. 2004. All rights reserved.
Product data sheet
Rev. 01 — 16 November 2004
11 of 45
Philips Semiconductors
TDA9882
Multistandard vision and QSS FM sound IF PLL demodulator
The intercarrier signal from the single reference QSS 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 MHz to 7 MHz.
The VCO within the FM PLL is phase-locked to the incoming 2nd SIF signal which is
frequency modulated. The VCO control voltage is superimposed by the AF voltage.
Therefore, the VCO tracks with the FM of the 2nd SIF signal. Thus, the AF voltage is
present at the loop filter and is typically 5 mV (RMS) for 27 kHz FM deviation. This
AF signal is fed via a buffer to the audio amplifier.
The correct locking of the PLL is supported by the digital acquisition help circuit; see
Section 8.6.
8.14 Audio amplifier and mute time constant
The audio amplifier consists of two parts:
AF preamplifier
AF output amplifier.
The AF preamplifier used for FM sound is an operational amplifier with internal feedback,
high gain and high common mode rejection. The AF voltage from the PLL demodulator is
5 mV (RMS) for a frequency deviation of 27 kHz and is amplified by 30 dB. By using a
DC operating point control circuit (with external capacitor CAF), the AF preamplifier is
decoupled from the PLL DC voltage. The low-pass characteristic of the amplifier reduces
the harmonics of the sound intercarrier signal at the AF output terminal.
For FM sound a switchable de-emphasis network (with external capacitor) is implemented
between the preamplifier and the output amplifier. The de-emphasis time constant with
50
µs or 75 µs depends on the FM carrier selection via pins FM0 and FM1; see Table 5.
The AF output amplifier provides the required AF output level by a rail-to-rail output stage.
A preceding stage makes use of an input selector for switching between the FM sound,
AM sound and mute state.
Switching to the mute state is controlled automatically, depending on the digital acquisition
help circuit should the VCO of the FM PLL not be in the required frequency window. This
is done by a time constant: fast for switching to the mute state and slow (typically 40 ms)
for switching to the non-mute state.
Auto mute can be disabled via pins SIF1 and SIF2 with resistor; see Table 6.


Codice articolo simile - TDA9882

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
NXP Semiconductors
TDA9880 PHILIPS-TDA9880 Datasheet
195Kb / 40P
   Alignment-free multistandard vision and FM sound IF-PLL demodulator
1999 Jul 21
TDA9880T PHILIPS-TDA9880T Datasheet
195Kb / 40P
   Alignment-free multistandard vision and FM sound IF-PLL demodulator
1999 Jul 21
TDA9881 NXP-TDA9881 Datasheet
226Kb / 42P
   Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards
Rev. 01-16 November 2004
TDA9881HN NXP-TDA9881HN Datasheet
226Kb / 42P
   Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards
Rev. 01-16 November 2004
TDA9881TS NXP-TDA9881TS Datasheet
226Kb / 42P
   Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards
Rev. 01-16 November 2004
More results

Descrizione simile - TDA9882

Produttore elettroniciIl numero della parteScheda tecnicaSpiegazioni elettronici
logo
NXP Semiconductors
TDA9880 PHILIPS-TDA9880 Datasheet
195Kb / 40P
   Alignment-free multistandard vision and FM sound IF-PLL demodulator
1999 Jul 21
TDA9881 NXP-TDA9881 Datasheet
226Kb / 42P
   Alignment-free vision and FM sound IF PLL demodulator for negative modulated TV standards
Rev. 01-16 November 2004
TDA9814T PHILIPS-TDA9814T Datasheet
249Kb / 36P
   Multistandard VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator
1998 Feb 09
TDA9887 PHILIPS-TDA9887 Datasheet
308Kb / 58P
   I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio
2004 Aug 25
TDA9887TS NXP-TDA9887TS Datasheet
232Kb / 58P
   I2C-bus controlled multistandard alignment-free IF-PLL demodulator with FM radio
2004 Aug 25
TDA9811 PHILIPS-TDA9811 Datasheet
228Kb / 36P
   Multistandard VIF-PLL with QSS-IF and AM demodulator
1998 Feb 09
TDA9815 PHILIPS-TDA9815 Datasheet
265Kb / 40P
   Multistandard/MAC VIF-PLL with QSS-IF and dual FM-PLL/AM demodulator
1998 Feb 11
TDA9810 PHILIPS-TDA9810 Datasheet
225Kb / 32P
   Multistandard VIF-PLL with QSS-IF and AM demodulator
1999 May 07
TDA9813T PHILIPS-TDA9813T Datasheet
160Kb / 32P
   VIF-PLL with QSS-IF and dual FM-PLL demodulator
1999 Sep 16
TDA9808 PHILIPS-TDA9808 Datasheet
218Kb / 36P
   Single standard VIF-PLL with QSS-IF and FM-PLL demodulator
1999 Jun 04
More results


Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45


Scheda tecnica Scarica

Go To PDF Page


Link URL




Privacy Policy
ALLDATASHEETIT.COM
Lei ha avuto il aiuto da alldatasheet?  [ DONATE ] 

Di alldatasheet   |   Richest di pubblicita   |   contatti   |   Privacy Policy   |   scambio Link   |   Ricerca produttore
All Rights Reserved©Alldatasheet.com


Mirror Sites
English : Alldatasheet.com  |   English : Alldatasheet.net  |   Chinese : Alldatasheetcn.com  |   German : Alldatasheetde.com  |   Japanese : Alldatasheet.jp
Russian : Alldatasheetru.com  |   Korean : Alldatasheet.co.kr  |   Spanish : Alldatasheet.es  |   French : Alldatasheet.fr  |   Italian : Alldatasheetit.com
Portuguese : Alldatasheetpt.com  |   Polish : Alldatasheet.pl  |   Vietnamese : Alldatasheet.vn
Indian : Alldatasheet.in  |   Mexican : Alldatasheet.com.mx  |   British : Alldatasheet.co.uk  |   New Zealand : Alldatasheet.co.nz
Family Site : ic2ic.com  |   icmetro.com