Zakładka z wyszukiwarką danych komponentów
  Polish  ▼
ALLDATASHEET.PL

X  

TDA9141 Arkusz danych(PDF) 7 Page - NXP Semiconductors

Numer części TDA9141
Szczegółowy opis  PAL/NTSC/SECAM decoder/sync processor
Download  25 Pages
Scroll/Zoom Zoom In 100%  Zoom Out
Producent  PHILIPS [NXP Semiconductors]
Strona internetowa  http://www.nxp.com
Logo PHILIPS - NXP Semiconductors

TDA9141 Arkusz danych(HTML) 7 Page - NXP Semiconductors

Back Button TDA9141 Datasheet HTML 3Page - NXP Semiconductors TDA9141 Datasheet HTML 4Page - NXP Semiconductors TDA9141 Datasheet HTML 5Page - NXP Semiconductors TDA9141 Datasheet HTML 6Page - NXP Semiconductors TDA9141 Datasheet HTML 7Page - NXP Semiconductors TDA9141 Datasheet HTML 8Page - NXP Semiconductors TDA9141 Datasheet HTML 9Page - NXP Semiconductors TDA9141 Datasheet HTML 10Page - NXP Semiconductors TDA9141 Datasheet HTML 11Page - NXP Semiconductors Next Button
Zoom Inzoom in Zoom Outzoom out
 7 / 25 page
background image
December 1992
7
Philips Semiconductors
Product specification
PAL/NTSC/SECAM decoder/sync
processor
TDA9141
This compensates for the delay of the
external chrominance delay lines.
Colour decoder
The PAL/NTSC demodulator
employs an oscillator that can operate
with either crystal (3.6 or 4.4 MHz). If
the I2C-bus indicates that only one
crystal is connected it will always
connect to the crystal on the
reference crystal input (pin 30).
The Hue signal, which is adjustable
via the I2C-bus, is gated during the
burst for NTSC signals.
The SECAM demodulator is an
auto-calibrating PLL demodulator
which has two references. The
reference crystal, to force the PLL to
the desired free-running frequency
and the bandgap reference, to obtain
the correct absolute value of the
output signal. The VCO of the PLL is
calibrated during each vertical
blanking period, when the IC is in
search mode or SECAM mode. If the
reference crystal is not 4.4 MHz the
decoder will not produce the correct
SECAM signals.
The frequency of the active crystal is
fed to the Fscomb output, which can
be connected to an external comb
filter IC. The DC value on this pin
contains the comb enable
information. Comb enable is true
when bus bit ECMB is HIGH. If ECMB
is LOW, the subcarrier frequency is
suppressed. The external comb filter
can force the DC value of Fscomb
LOW, as pin Fscomb also acts as
input pin. In this event the subcarrier
frequency is still present. If the DC
value of Fscomb is HIGH, the input
switch is always forced in Y/C mode,
indicated by bus bit YC.
Sync processor (
ϕ1 loop)
The main part of the sync circuit is a
432
× fH (6.75 MHz) oscillator the
frequency of which is divided by 432
to lock the Phase 1 loop to the
incoming signal. The time constant of
the loop can be forced by the I2C-bus
(fast or slow). If required the IC can
select the time constant, depending
on the noise content of the input
signal and whether the loop is
phase-locked or not (medium or
slow). The free-running frequency of
the oscillator is determined by a
digital control circuit that is locked to
the active crystal.
When a power-on-reset pulse is
detected the frequency of the
oscillator is switched to a frequency
greater than 6.75 MHz to protect the
horizontal output transistor. The
oscillator frequency is reset to
6.75 MHz when the crystal indication
bits have been loaded into the IC. To
ensure that this procedure does not
fail it is absolutely necessary to send
subaddress 00 before subaddress
01. Subaddress 00 contains the
crystal indication bits and when
subaddress 01 is received the line
oscillator calibration will be initiated
(for the start-up procedure after
power-on reset detection see the
I2C-bus protocol. The calibration is
terminated when the oscillator
frequency reaches 6.75 MHz. The
oscillator is again calibrated when an
out-of-lock condition with the input
signal is detected by the coincidence
detector. Again the calibration will be
terminated when the oscillator
frequency reaches 6.75 MHz.
The Phase 1 loop can be opened
using the I2C-bus. This is to facilitate
On Screen Display (OSD)
information. If there is no input signal
or a very noisy input signal the phase
1 loop can be opened to provide a
stable line frequency and thus a
stable picture.
The sync part also delivers a
two-level sandcastle signal, which
provides a combined horizontal and
vertical blanking signal and a
clamping pulse for the display section
of the TV.
Vertical divider system
The vertical divider system has a fully
integrated vertical sync separator.
The divider can accommodate both
50 and 60 Hz systems; it can either
locate the field frequency
automatically or it can be forced to the
desired system via the I2C-bus. A
block diagram of the vertical divider
system is illustrated in Fig.4. The
divider system operates at twice the
horizontal line frequency. The line
counter receives enable pulses at this
line frequency, thereby counting two
pulses per line.
A state diagram of the controller is
illustrated in Fig.5. Because it is
symmetrical only the right hand part
will be described.
Depending on the previously found
field frequency, the controller will be
in one of the COUNT states. When
the line counter has counted 488
pulses (i.e. 244 lines of the video
input signal) the controller will move
to the next state depending on the
output of the norm counter. This can
be either NORM, NEAR_NORM or
NO_NORM depending on the
position of the vertical sync pulse in
the previous fields. When the
controller is in the NORM state it
generates the vertical sync pulse
(VSP) automatically and then, when
the line counter is at LC = 626,
moves to the WAIT state. In this
condition it waits for the next pulse of
the double line frequency signal and
then moves to the COUNT state of
the current field frequency. When the
controller returns to the COUNT state
the line counter will be reset half a line
after the start of the vertical sync
pulse of the video input signal.


Podobny numer części - TDA9141

ProducentNumer częściArkusz danychSzczegółowy opis
logo
NXP Semiconductors
TDA9143 PHILIPS-TDA9143 Datasheet
275Kb / 40P
   I2C-bus controlled, alignment-free PAL/NTSC/SECAM decoder/sync processor
1996 Jan 17
TDA9144 PHILIPS-TDA9144 Datasheet
309Kb / 44P
   I2C-bus controlled, alignment-free PAL/NTSC/SECAM decoder/sync processor with PALplus helper demodulator
1996 Jan 17
More results

Podobny opis - TDA9141

ProducentNumer częściArkusz danychSzczegółowy opis
logo
NXP Semiconductors
TDA9160 PHILIPS-TDA9160 Datasheet
220Kb / 27P
   PAL/NTSC/SECAM decoder/sync processor
December 1991
TDA9143 PHILIPS-TDA9143 Datasheet
275Kb / 40P
   I2C-bus controlled, alignment-free PAL/NTSC/SECAM decoder/sync processor
1996 Jan 17
logo
Asahi Kasei Microsystem...
AK8853XQ AKM-AK8853XQ Datasheet
616Kb / 70P
   NTSC/PAL/SECAM Digital Video Decoder
AK8859VN AKM-AK8859VN Datasheet
704Kb / 72P
   NTSC/PAL/SECAM Digital Video Decoder
AK8859VQ AKM-AK8859VQ Datasheet
703Kb / 73P
   NTSC/PAL/SECAM Digital Video Decoder
AK8851 AKM-AK8851 Datasheet
803Kb / 80P
   NTSC/PAL/SECAM Digital Video Decoder
logo
Texas Instruments
TVP5150A TI-TVP5150A Datasheet
375Kb / 79P
[Old version datasheet]   ULTRALOW POWER NTSC/PAL/SECAM VIDEO DECODER WITH REBUST SYNC DETECTOR
G2R-14-12VDC TI1-G2R-14-12VDC Datasheet
395Kb / 73P
[Old version datasheet]   Ultralow Power NTSC/PAL/SECAM Video Decoder With RObust Sync Detector
TVP5150A TI-TVP5150A Datasheet
355Kb / 72P
[Old version datasheet]   Ultralow Power NTSC/PAL/SECAM Video Decoder With Robust Sync Detector
TVP5150AM1 TI1-TVP5150AM1 Datasheet
1Mb / 88P
[Old version datasheet]   Ultralow-Power NTSC/PAL/SECAM Video Decoder
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


Arkusz danych Pobierz

Go To PDF Page


Link URL




Polityka prywatności
ALLDATASHEET.PL
Czy Alldatasheet okazała się pomocna?  [ DONATE ] 

O Alldatasheet   |   Reklama   |   Kontakt   |   Polityka prywatności   |   Linki   |   Lista producentów
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