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OM8839PS (N301)
2
I
C-bus Controlled PAL/NTSC/SECAM TV Processors
1. Features
The following features are available in all IC's:
·Multi-standard
vision
alignment-free PLL demodulator without external
components
·Alignment-free
multi-standard
demodulator (4.5 MHz to 6.5 MHz)
·Audio switch
·Flexible source selection with CVBS switch and
Y(CVBS)/C input so that a comb filter can be
applied
·Integrated chrominance trap circuit
·Integrated luminance delay line
·Asymmetrical peaking in the luminance channel
with a (defeatable) noise coring function
·Black stretching of non-standard CVBS or lumina-
nce signals
·Integrated chroma band-pass filter with switchable
centre frequency
·Dynamic skin tone control circuit
·Blue stretch circuit which offsets colours near
white towards blue
·RGB control circuit with "Continuous Cathode
Calibration" and white point adjustment
·Possibility to insert a"blue back" option when no
video signal is available
·Horizontal synchronization with two control loops
and alignment-free horizontal oscillator
·Vertical count-down circuit
·Vertical driver optimised for DC-coupled vertical
output stages
2
·I
C-bus control of various functions
3. Survey of IC Types
Envelope
TV receiver category
PAL only
PAL/NTS
PAL/SECAM/NTSC
NTSC only
SERVICE MANUAL
IF
circuit
with
FM
sound
S-DIP 56
Economy
Mid/High end
TDA 8840
TDA 8841
TDA 8843
TDA 8842
TDA 8844
TDA 8846/46A
TDA 8847
2. General Description
The various versions of the TDA 884X/5X
2
an
series are I
C-bus controlled single chip TV
processors which are intended to be applied in
PAL, NTSC, PAL/NTSC and multi-standard
television receivers. The N2 version is pin and
application compatible with the N1 version,
however, a new feature has been added which
makes the N2 more attractive. The IF PLL
demodulator
has
alignment-free
IF
internal VCO (no tuned circuit required). The
setting of the various frequencies (33.4, 33.9,
38, 38.9, 45.75 and 58.75 MHz) can be made
2
via the I
C-bus.
Because of this difference the N2 version is
compatible with the N1, however, N1 devices
cannot be used in an optimised N2 application.
Functionally the IC series is split up in 3
categories, viz:
·Versions intended to be used in economy TV
receivers with all basic functions (envelope:
S-DIP 56 and QFP 64)
·Versions with additional features like E-W
geometry control,
YUV interface which are intended for TV
receivers with 110° picture tubes (envelope:
S-DIP 56)
·Versions which have in addition a second
RGB input with saturation control and a
second CVBS output (envelope: QFP 64)
The various type numbers are given in the
table below.
Economy
TDA 8840H
TDA 8841H
TDA 8842H
12
been
replaced
by
PLL
demodulator
with
H-V zoom function and
QFP 64
Mid/High end
TDA 8854H
TDA 8857H
an
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