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參數(shù)資料
| 型號： | VDP3108PR |
| 英文描述： | Consumer IC |
| 中文描述： | 消費性IC |
| 文件頁數(shù)： | 21/72頁 |
| 文件大小： | 597K |
| 代理商： | VDP3108PR |
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PRELIMINARY DATA SHEET
VDP 31xxB
21
Micronas
2.9. Analog Back End
The digital RGB signals are converted to analog RGBs
using three video digital to analog converters (DAC) with
10-bit resolution. An analog brightness value is provided
by three additional DACs. The adjustment range is 40%
of the full RGB range.
Controlling the whitedrive/analog brightness and also
the external contrast and brightness adjustments is
done via the Fast Processor, located in the front-end.
Control of the cutoff DACs is via I
2
C-bus registers.
Finally cutoff and blanking values are added to the RGB
signals. Cutoff (dark current) is provided by three 9-bit
DACs. The adjustment range is 60% of full scale RGB
range.
The analog RGB-outputs are current outputs with cur-
rent-sink characteristics. The maximum current drawn
by the output stage is obtained with peak white RGB. An
external half contrast signal can be used to reduce the
output current of the RGB outputs to 50%.
2.9.1. CRT Measurement and Control
The display processor is equipped with an 8-bit PDM-
ADC for all measuring purposes. The ADC is connected
to the sense input pin, the input range is 0 to 1.5V. The
bandwidth of the PDM filter can be selected; it is
40/80 kHz for small/large bandwidth setting. The input
impedance is more than 1 M
.
Cutoff and white drive current measurement are carried
out during the vertical blanking interval. They always use
the small bandwidth setting. The current range for the
cutoff measurement is set by connecting a sense resis-
tor to the MADC input. For the whitedrive measurement,
the range is set by using another sense resistor and the
range select switch 2 output pin (RSW2). During the ac-
tive picture, the minimum and maximum beam current
is measured. The measurement range can be set by us-
ing the range select switch 1 pin (RSW1) as shown in
Fig. 2
–
21 and Fig. 2
–
22. The timing window of this mea-
surement is programmable. The intention is to automati-
cally detect letterbox transmission or to measure the ac-
tual beam current. All control loops are closed via the
external control microprocessor.
SENSE
RSW1
RSW2
R2
R3
beam current
A
D
MADC
R1
Fig. 2
–
21:
MADC Range Switches
ultra black
black
cutoff
R
white
drive
CR + IBRM
CR + IBRM + WDRV
·
WDR
R
G
B
TML
CG + IBRM
CB + IBRM
PICTURE MEAS.
PICTURE MEAS.
TUBE MEASUREMENT
active
measurement
resistor
R1 R2 R3
RSW1=on, RSW2=on
R1
R1 R3
=on
R
cutoff
G
cutoff
B
R1 R2 R3
Fig. 2
–
22:
MADC Measurement Timing
RSW1=on, RSW2=on
PMST
PMSO
Lines
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