آی سی TDA8844

IC TDA8844

FEATURES

The following features are available in all IC’s

 Multi-standard vision IF circuit with an alignment-free

PLL demodulator without external components

· Alignment-free multi-standard FM sound 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 luminance

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

 I2C-bus control of various functions

The detailed differences between the various IC’s are

     given in the table on page 3

GENERAL DESCRIPTION

The various versions of the TDA 884X/5X series are

I2C-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 The IF PLL demodulator has been replaced by

an alignment-free IF PLL demodulator with 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 via the I2C-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 is 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, H-V zoom function and 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.