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8. IC DATASHEETS&SPECS
OM 8365
General Description
OM8365H combine the functions of a video processor together with a µ-Controller, US Closed
The
Caption decoder and Teletext decoder. The Teletext decoder has an internal RAM memory for 10
page text. The ICs are intended to be used in economy television receivers with 110° picture tubes.
The ICs have supply voltages of 8 V and 3.3 V and they are mounted in a QFP 80 envelope. The
features are given in the following feature list. FEATURES.
TV-signal processor
• Multi-standard vision IF circuit with alignment-
free PLLdemodulator
• Internal (switchable) time-constant for the IF-
AGC circuit
• The QSS and mono FM functionality are both
available so that an FM/AM TV receiver can be
built without the use of additional ICs
• The mono intercarrier sound circuit has a
selective FM-PLL demodulator which can be
switched to the different FM sound frequencies
(4.5/5.5/6.0/6.5 MHz). The quality of this
system is such that the external band-pass
filters can be omitted.
• The FM-PLL demodulator can be set to
centre frequencies of 4.74/5.74 MHz so that a
second sound channel can be demodulated. In
such an application it is necessary that an
external bandpass filter is inserted.
• The vision IF and mono intercarrier sound
circuit can be used for the demodulation of FM
radio signals
• Video switch with 2 external CVBS inputs and
a CVBS output. One of the CVBS inputs can
be used as Y/Cinput.
• 2 external audio inputs. The selection of the
variousinputs is coupled to the selection of the
CVBS signals
• Integrated chrominance trap circuit
• Integrated luminance delay line with
adjustable delay time
• Picture improvement features with peaking
(with switchable centre frequency, depeaking,
variable positive/negative overshoot ratio and
video dependent coring) and white stretching.
• Switchable group delay correction in the
CVBS path
• Integrated chroma band-pass filter with
switchablecentre frequency• Switchable DC
transfer ratio for the luminance signal
• Only one reference (12 MHz) crystal required
for the µ-Controller, Teletext- and the colour
decoder
• Multi-standard colour decoder with automatic
search system
• Internal base-band delay line
• Indication of the Signal-to-Noise ratio of the
incoming CVBS signal
• A linear RGB/YUV/YPBPR input with fast
blanking for external RGB/YUV sources. The
synchronisation circuitcan be connected to the
incoming Y signal. The Text/OSD signals are
internally supplied from the µ-Controller /
Teletext decoder.
• RGB control circuit with 'Continuous Cathode
Calibration', white point and black level off-set
adjustment so that the colour temperature of
the dark and the light parts of the screen can
be chosen independently.
• Contrast reduction possibility during mixed-
mode of OSD and Text signals
• Adjustable 'wide blanking' of the RGB outputs
• Horizontal synchronization with two control
loops and alignment-free horizontal oscillator
• Vertical count-down circuit
• Vertical driver optimized for DC-coupled
vertical output stages
• Horizontal and vertical geometry processing
• Horizontal and vertical zoom function for 16:9
applications
• Horizontal parallelogram and bow correction
for large screen picture tubes
• Low-power start-up of the horizontal drive
circuit
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