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(4) Pin Description
Pin 1 - Supply Voltage, Output Pin Driver VSUPP*
This pin is used as supply for the following digital output
pins : FIFORRD, FIFORD, FIFOWR, FIFORWR.
Pin 2 - Ground, Output Pin Driver GNDP*
Output Pin Driver Reference
Pin 3 - Sync Signal Input VS2
Additional pin for the vertical sync information. Via
Register the used vertical sync can be switched between
the inputs VS2 and VS(Pin 64)
Pin 4 - Reset for FIFO Read Counter FIFORRD
This signal is active-High and resets the read counter in
the display frequency doubling FIFO.
Pin 5 - Read Enable for FIFO FIFORD
This signal is active-High and enabels the read counter in
the display frequency doubling FIFO.
Pin 6 - Write Enable for FIFO FIFOWR
This signal is active-High and enables the write counter in
the display frequency doubling FIFO.
Pin 7 - Reset for FIFO Write Counter FIFOWR
This signal is active-High and enables the write counter in
the display frequency doubling FIFO.
Pin 8 - Horizontal Drive HOUT
This open-drain output supplies the drive pulse for the hor-
izontal output stage. A pull-up resistor has to be used.
Pin 9 - Horizontal Flyback Input HFLB
Via this pin, the horizontal flyback pulse is supplied to the
DDP 3310B.
Pin 10 - Safety Input SAFETY
This input has two thresholds. A signal between the lower
and upper threshold means normal function. Other signals
are detected as malfunction.
Pin 11 - Vertical Protection Input VPROT
The vertical protection circuitry prevents the picture tube
from burn-in in the event of a malfunction of the vertical
deflection stage. If the peak-to-peak value of the vertical
sawtooth signal is too small, the RGB output signals are
blanked.
Pin 12 - H-Drive Frequency Range Select FREQSEL
This pin selects the frequency range for the horizontal
drive signal.
2
Pin 13 - Clock Select 40.5 or 27/32 MHzCM1
I C
Low level selects 27/32 MHz, High level selects 40.5 MHz
Pin 14 - Clock Select 40.5 or 27/32 MHzCM0
Low level selects 27 MHz, High level selects 32 MHz
Pin 15 - Range Switch2 for Measuring ADC RSW2
This pin is an open-drain pull-down output. During cutoff
measurement the switch is off. During white drive mea-
surement the switch is on. Also during the rest of time it is
on.
Pin 16 - Range Switch 1 or Second Input for Measuring
ADC RSW1
This pin is an open-drain pull-down output. During cutoff
and white-drive measurement, the switch is off. During
the rest of time it is on. The RSW1 pin can be used as
second measurement ADC input.
Pin 17 - Measurement ADC Input SENSE
This is the input of the analog to digital converter for the
picture and tube measurement. Three measurement
ranges are selectable with RSW1 and RSW2
Pin 18 - Measurement ADC Reference Input MGND
This is the ground reference for the measurement A/D
converter.
Pin 19 - Vertical Sawtooth Output VERT+(19)
This pin supplies the drive signal for the vertical output
stage. The drive signal is generated with 15-bit precision.
The analog voltage is generated by a 4-bit current DAC
with external resistor (6 k
uses digital noise-shaping.
Pin 20 - Vertical Sawtooth Output inverted VERT-
This pin supplies the inverted signal of VERT+.
24
IC description
for proper operation) and
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