Daewoo DTW - 28W2F, Руководство по обслуживанию, Страница: 36 / 47

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Pin 44 to 51 - L0 to L7 Luma Input
These are the inputs for the digital luma signal which must
be in pure binary coded format. Connect to ground if not
used.
Pin 52 - DVSS Digital Ground
This is the common ground connection of all digital stages
and must be connected to ground.
Note : All ground pins of the chip(i.e. 18, 52, 58, 60, 62,
64, 66, and 68) must be connected together low resistive.
The layout of the PCB must take into consideration the
need for a low-noise ground.
Pin 53 - DVDD Digital 5V
This pin supplies all digital stages and must be connected
to a positive supply voltage.
Note : The layout of the PCB must take into consideration
the need for a low-noise supply. A bypass capacitor has to
be connected between ground and DVDD.
Pin 54 - CLK Main Clock Input
This is the input for the clock signal. The frequency and
vary in the range from 13.5MHz to 20.25MHz.
Pin 55 - RESQ Input
A low signal at this input pin generates a reset. The low-to-
high transition of this signal should occur when the supply
voltage is stable(power-on reset).
Pin 56 - TMODE Input
This pin is for test purposes only and must be connected
to ground in normal operation.
Pin 57 - AVDD Analog 5V
This is the supply voltage pin for the A/D converters and
must be connected to a positive supply voltage.
Note : The layout of the PCB must take into consideration
the need for a low-noise supply. A bypass capacitor has to
be connected between ground and AVDD.
Pin 58 - AVSS Analog Ground
This is the ground pin for the A/D converters and must be
connected to ground.
Note : All ground pins of the chip (i.e. 18,52,58,60,62,64,
66, and 68) must be connected together low resistive. The
layout of the PCB must take into consideration the need
for a low-noise ground.
Pin 59 - ADREF Connect External Capacitor
This pin should be connected to ground over a 10uF and a
100nF capacitor in parallel.
Pin 60 - SUBSTRATE
This is connected to the platform which carries the “die”
and must be cvonnected to the ground.
Note : All ground pins of the chip(i.e.
18,52,58,60,62,64,66, and 68) must be connected
together low resistive. The layout of the PCB must take
into consideration the need for a low-noise ground.
Pin 61 - FB Analog Fast Blank Input
This input takes the DC-coupled analog Fast Blank signal.
The amplitude is 1.0V maximum at 75 Ohms. Connect to
ground if not used.
Pin 62 - GNDFB Analod Ground
This is the ground pin for the AD converter of the Fast
Blank signal and has to be connected to ground.
Note : All ground pins of the chip (i.e. 18,52,58,60,62,64,
62,64,66 and 68) must be connected together low resis-
tive. The layout of the PCB must take into consideration
the need for a low-noise ground.
Pin 63 - BU Analog Blue/U Chroma Input
The input pin takes the AC-coupled analog compont signal
Blue or U Chroma. The amplitude is 1.0V maximum at 75
Ohms and a coupling capacitor of 220 nF. Internally, the
DC-offset of the input signal is adjusted via the program-
mable internal clamping circuit. Connect to ground if not
used.
Pin 64 - GNDBU Analog Ground
This is the ground pin for the A/D converter of the Blue or
U Chroma signal and must be connected to ground.
Note : All ground pins of the chip(i.e.
18,52,58,60,62,64,66, and 68) must be connected
together low resistive. The layout of the PCB must take
into consideration the need for a low-noise ground.
IC DESCRIPTION
APPENDIX