Daewoo DUB-2850GB Service Manual page 19

QFP 128pin
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4.1.4 FEATURES
Analogue Video Processing (all versions)
Multi-standard vision IF circuit with alignment-free PLL demodulator
Internal (switchable) time-constant for the IF-AGC circuit
Switchable group delay correction and sound trap (with switchable centre frequency) for the
demodulated CVBS signal
DVB/VSB IF circuit for preprocessing of digital TV signals.
Video switch with 3 external CVBS inputs and a CVBS output. All CVBS inputs can be used
as Y-input for Y/C signals. However, only 2 Y/C sources can be selected because the circuit
has 2 chroma inputs. It is possible to add an additional CVBS(Y)/C input (CVBS/YX and CX)
when the YUV interface and the RGB/YPRPB input are not needed.
Automatic Y/C signal detector
Adaptive digital (4H/2H) PAL/NTSC comb filter for optimum separation of the luminance and
the chrominance signal.
Integrated luminance delay line with adjustable delay time
Picture improvement features with peaking (with switchable centre frequency, depeaking,
variable positive/negative peak ratio, variable pre-/overshoot ratio and video dependent
coring), dynamic skin tone control, gamma control and blue- and black stretching. All
features are available for CVBS, Y/C and RGB/YPBPR signals.
Switchable DC transfer ratio for the luminance signal
Only one reference (24.576 MHz) crystal required for the TCG m-Controller, digital sound
processor, Teletext and the colour decoder
Multi-standard colour decoder with automatic search system and various forced mode
possibilities
Internal base-band delay line
Indication of the Signal-to-Noise ratio of the incoming CVBS signal
Linear RGB/YPBPR input with fast insertion.
YUV interface. When this feature is not required some pins can be used as additional RGB/YPBPR
input. It is also possible to use these pins for additional CVBS (or Y/C) input (CVBS/YX and CX).
Symbol
P3.0/ADC0
P3.1/ADC1
VDDC1
DECV1V8
P3.2/ADC2
P3.3/ADC3
VSSC/P
P2.4/PWM3
P2.5/PWM4
VDDC3
VSSC3
P1.2/INT2
P1.4/RX
P1.5/TX
Short Description
port 3.0 or ADC0 input
port 3.1 or ADC1 input
digital supply to core (+1.8 V)
decoupling 1.8 V supply
port 3.2 or ADC2 input
port 3.3 or ADC3 input
digital ground for m-Controller core and periphery
port 2.4 or PWM3 output
port 2.5 or PWM4 output
digital supply to core (1.8V)
Ground
port 1.2 or external interrupt 2
port 1.4 or UART bus
Port 1.5 or UART bus
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CP-780 Service Manual