Magnum PF21GB300 Service Manual page 14

Data Capture
·Text memory for 1 page
·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 625 line 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 -processor throughput
·Automatic detection of FASTEXT transmission
·Real-time packet 26 engine in Hardware for processing accented,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
·Up to 4 character sets with 256 characters each (size 16 pixels x 18 lines)
·Enhanced OSD modes
·50Hz/60Hz display timing modes
·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
·Global selectable matrix: (12/16)
·Fringe colour selectable
·Contrast reduction of defined area
·Programmable Cursor
·Special Graphics Characters with two planes, allowing four colours per character
4.2 TFA9842AJ
2-channel audio amplifier with volume control (SE: 1 W to 7.5 W)
4.2.1 General description
The TFA9842AJ contains two identical audio power amplifiers. The TFA9842AJ can be used as two Single-Ended
(SE) channels with a volume control. The maximum gain is 26 dB. The TFA9842AJ comes in a 9-pin DIL-bent-SIL
(DBS9P) power package. The TFA9842AJ is pin compatible with the TFA9843AJ, TFA9843(B)J, TFA9842(B)J
and TFA9841J. The difference between the TFA9843AJ and the TFA9843(B)J,TFA9842(B)J, TFA9841J is the
functionality of pin 7. The TFA9843AJ has a Volume
Control (VC) on pin 7. The TFA9843(B)J, TFA9842(B)J and TFA9841J have a mode select (Mode) on pin 7.The
TFA9842AJ contains a unique protection circuit that is solely based on multiple temperature measurements inside
the chip. This gives maximum output power for all supply voltages and load conditions with no unnecessary audio
holes. Almost any supply voltage and load impedance combination can be made as long as thermal boundary
conditions (number of channels used, external heatsink and ambient temperature) allow it.
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