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