APPENDIX
IC DESCRIPTION
Together with this pin, it can be used to drive symmetrical These pins are used to switch the RGB outputs to the
deflection amplifiers.external analog RGB inputs. FBLIN1 switches the RIN1,
GIN1 and BIN1 inputs, FBLIN2 switches the RIN2, GIN2
Pin 21 - East/West Parabola Output EWand BIN2 inputs. The active level (Low or High) can be
This pin supplies the parabola signal for the East/West selected by software.
correction. The drive signal is generated with 15-bit preci-
sion. The analog voltage is generated by a 4-bit current Pin 31, 32, 33 - Analog RGB Input1 RIN1, GIN1, BIN1
DAC with external resistor and uses digital noise-shaping.These pin are used to insert an external analog RGB sig-
nal, e.g. from a SCART connector which can by switched
Pin 22 - DAC Current Reference XREFto the analog RGB outputs with the Fast-Blank signal.
External reference resistor for DAC output currents, typical The analog back-end provides separate brightness and
10 k §Ů , to adjust the output current of the D/A converters. contrast settings for the external analog RGB signals.
(see recommended operation conditions).
This resistor has to be connected to analog fround as Pin 35, 36, 37 - Analog RGB Input2 RIN2, GIN2, BIN2
closely as possible to the pin.These pins are used to insert an external analog RGB sig-
nal, e.g. from a SCART connector which can by switched
Pin 23 - Scan Velocity Modulation Output SVMto the analog RGB outputs with the Fast-Blank signal.
This output delivers the analog SVM signal. The D/A con-The analog back-end provides separate brightness and
verters. At zero signal the output current is 50% of the contrast settings for the external analog RGB signals.
maximum output current.
Pin 38 - Test Input TEST
Pin 24,25,26 - Analog RGB Output ROUT, GOUT, BOUTThis pin enables factory test modes. For normal operation
These pins are the analog Red/Green/Blue outputs of the it must be connected to ground.
back-end. The outputs are current sinks.
Pin 39 - Reset Input RESQ
Pin 27 - Ground, Analog Back-end GNDO*A low level on this pin resets the DDP 3310B.
This pin has to be connected to the analog supply voltage.
No supply current for the digital stages should flow through Pin 40 - Adjustable DC Output 1 PWM1
this line.This output delivers a DC voltage with a resolution of 8 2
bit, adjustable over the bus. The output is driven by a I C
push-pull stage. The PWM frequency is appr 79.4MHz.
Pin 28 - Supply Voltage, Analog Back-end VSUPO*
For a ripple-free voltage a first order lowpass filter with a
This pin has to be connected to the analog supply voltage.
corner frequency < 120 Hz should be applied.
No supply current for the digital stages should flow through
this line.Pin 41 - Adjustable DC Output 2 PWM2
See pin 40.
Pin 29 - DAC Reference Decouplign/Beam Current Safety
VRD/BCSPin 42 - Half-Contrast Input HCS
Via this pin, the DAC reference voltage is decoupled by an Via this input pin the output level of the D/A-converted
internal RGB signals can be reduced by 6dB. Inserted
external capacitor. The DAC output currents depend on
external analog RGB signals remain unchanged.
this voltage, therefore a pull-down transistor can be used
to shut off all beam currents. A decoupling capacitor of
Pin 43...50 - Picture Bus Chroma C0...C7
4.7uF in parallel to 100uF (low inductance) is required.
The Picture Bus Chroma lines carry the multiplexed color
component data. For the 4:1:1 input signal (4-bit chroma)
Pin 30, 34 - Fast-Blank Input FBLIN1/2the pins C4...C7 are used.
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ACEC
