Reset signal
The externally applied RESET signal (active HIGH) is used to initialize the microcontroller
core, in addition to the teletext decoder. However, the teletext decoder incorporates a
separate internal reset function which is activated on the rising edge of the analog supply
pin, VDDA . The purpose of this internal reset circuit is to initialize the teletext decoder when
returning from the ?text standby mode?.
TDA884X FAMILY SPECIFICATION
FEATURES
The following features are available in all IC?s:
? Multi-standard vision IF circuit with an alignment-freePLL 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 andY(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 luminancesignals
? Integrated chroma band-pass filter with switchablecentre frequency
? Dynamic skin tone control circuit
? Blue stretch circuit which offsets colours near whitetowards blue
? RGB control circuit with ?Continuous CathodeCalibration? and white point adjustment
? Possibility to insert a ?blue back? option when no videosignal is available
? Horizontal synchronization with two control loops andalignment-free horizontal
oscillatoroptimised N2 application.Functionally the IC series is split up is 3 categories,
viz:
E.G.Data creazione 01/11/99 17.27 13 / 30 F19MANU.doc |
ACEC
