Grundig Chassis D5, Service Manual

Page: 11 / 38

Chassis D5 GRUNDIG Service
1 - 11
IC Data Sheets & Specifications
IC 101 - OM 8365
The OM8365H combine the functions of a video processor together
with a µ-Controller, US Closed Caption decoder and Teletext deco-
der. The Teletext decoder has an internal RAM memory for 10 page
text. The ICs are intended to be used in economy television recei-
vers with 110° picture tubes. The ICs have supply voltages of 8V
and 3.3V and they are mounted in a QFP 80 envelope.
TV-Signal Processor
• Multi-standard vision IF circuit with alignment-free PLL demodula-
tor.
• 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 de-
modulator which can be switched to the different FM sound fre-
quencies (4.5/5.5/6.0/6.5MHz). 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
4.74/5.74MHz so that a second sound channel can be demodula-
ted. In such an application it is necessary that an external band-
pass 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/C input.
• 2 external audio inputs. The selection of the various inputs is cou-
pled 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 cen-
tre frequency, depeaking, variable positive/negative overshoot ra-
tio and video dependent coring) and white stretching.
• Switchable group delay correction in the CVBS path.
• Integrated chroma band-pass filter with switchable centre fre-
quency.
• Switchable DC transfer ratio for the luminance signal.
• Only one reference (12MHz) 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 si-
gnal.
• 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 tempe-
rature 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 pic-
ture tubes.
• Low-power start-up of the horizontal drive circuit.
µ-Controller
• 80C51 µ-controller core standard instruction set and timing.
• 1 µs machine cycle.
• 64 - 96Kx8-bit late programmed ROM.
• 12Kx8-bit DataRAM (shared between Display, Acquisition and
Auxiliary RAM).
• Interrupt controller for individual enable/disable with two level
priority.
• Two 16-bit Timer/Counter registers.
• One 16-bit Timer with 8-bit Pre-scaler.
• WatchDog timer.
• Auxiliary RAM page pointer.
• 16-bit Data pointer.
• Stand-by, Idle and Power Down modes.
• 14 bits PWM for Voltage Synthesis Tuning.
• 8-bit A/D converter with 4 multiplexed inputs.
• 5 PWM (6-bits) outputs for control of TV analogue signals.
• 18 general I/O ports.
Data Capture
• Text memory for 10 pages.
• Inventory of transmitted Teletext pages stored in the Transmitted
Page Table (TPT) and Subtitle Page Table (SPT).
• Data Capture for US Closed Caption.
• Data Capture for 525/625 line WST, VPS (PDC system A) and
Wide Screen Signalling (WSS) bit decoding.
• Automatic selection between 525 WST/625 WST.
• Automatic selection between 625 WST/VPS on line 16 of VBI.
• Real-time capture and decoding for WST Teletext in Hardware, to
enable optimized µ-processor throughput.
• Automatic detection of FASTEXT transmission.
• Real-time packet 26 engine in Hardware for processing accen-
ted, G2 and G3 characters.
• Signal quality detector for video and WST/VPS data types.
• Comprehensive teletext language coverage.
• Full Field and Vertical Blanking Interval (VBI) data capture of
WST data Display.
• Teletext and Enhanced OSD modes.
• Features of level 1.5 WST and US Close Caption.
• Serial and Parallel Display Attributes.
• Single/Double/Quadruple Width and Height for characters.
• Scrolling of display region.
• Variable flash rate controlled by software.
• Enhanced display features including overlining, underlining and
italics.
• Soft colours using CLUT with 4096 colour palette.
• Globally selectable scan lines per row (9/10/13/16) and character
matrix [12x10, 12x13, 12x16 (VxH)].
• Fringing (Shadow) selectable from N-S-E-W direction.
• Fringe colour selectable.
• Meshing of defined area.
• Contrast reduction of defined area.
• Cursor.
• Special Graphics Characters with two planes, allowing four co-
lours per character.
• 32 software redefinable On-Screen display characters.
• 4 WST Character sets (G0/G2) in single device (e.g. Latin, Cyril-
lic, Greek, Arabic).
• G1 Mosaic graphics, Limited G3 Line drawing characters.
• WST Character sets and Closed Caption Character set in single
device.