Daewoo DUB-2850, Service Manual

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CP-780 Service Manual
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QFP 128pin Symbol Short Description
115 P3.0/ADC0 port 3.0 or ADC0 input
116 P3.1/ADC1 port 3.1 or ADC1 input
117 VDDC1 digital supply to core (+1.8 V)
118 DECV1V8 decoupling 1.8 V supply
119 P3.2/ADC2 port 3.2 or ADC2 input
120 P3.3/ADC3 port 3.3 or ADC3 input
121 VSSC/P digital ground for m-Controller core and periphery
122 P2.4/PWM3 port 2.4 or PWM3 output
123 P2.5/PWM4 port 2.5 or PWM4 output
124 VDDC3 digital supply to core (1.8V)
125 VSSC3 Ground
126 P1.2/INT2 port 1.2 or external interrupt 2
127 P1.4/RX port 1.4 or UART bus
128 P1.5/TX Port 1.5 or UART bus
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).