Beko D5 Service Manual page 20

TDA8601
RGB/YUV and fast blanking switch
Features
• YUV/RGB and fast blanking switch
• 3-state output
• Selectable clamp:
– passive (with diodes) or active clamp
• Bandwidth greater than 22 MHz
• Fully ESD protected
• Latch-up free.
Applications
• Standard and high definition television sets
• Peri-television sets.
General Description
The device is intended for switching between two
RGB or YUV video sources. The outputs can be
set to a high-impedance state to enable parallel
connection of several devices. A HIGH level on
SEL (pin 5) selects the video inputs of Channel 2.
The IOCNTR control pin (pin 16) defines the 3-
state outputs and clamp inputs:
• HIGH = 3-state outputs (also for test; active
clamp)
• LOW = passive clamp at the video inputs (diode)
• Sandcastle: the video signal is clamped with an
active clamp during the sync pulse.
LA7840
Vertical Deflection Output Circuit
General Description
The LA7840 is a vertical deflection output IC for
TVs and CRT displays with excellent image
quality that use a BUS control system signal
processing IC. This IC can drive the direct (even
including a DC component) deflection yoke with
the sawtooth wave output from the BUS control
system signal processing IC. When used in
conjunction with Sanyo's LA7615 series of BUS
control system signal processing ICs for TVs,
this IC can process all color television signal
system functions through the BUS system.
Because the maximum deflection current is 1.8
Ap-p, the LA7840 is suited for small and medium
screen sets.
Features
• Low power dissipation due to built-in
pump-up circuit
• Vertical output circuit
• Thermal protection circuit built in
• Excellent crossover characteristics
• DC coupling possible
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