參數(shù)資料
型號(hào)： VDP3104B
廠商： MICRONAS SEMICONDUCTOR HOLDING AG
元件分類： 消費(fèi)家電
英文描述： Video Processor Family
中文描述： SPECIALTY CONSUMER CIRCUIT, PDIP64
封裝： SHRINK, PLASTIC, DIP-64
文件頁(yè)數(shù)： 22/72頁(yè)
文件大?。?/td> 603K
代理商： VDP3104B
PRELIMINARY DATA SHEET
VDP 31xxB
22
Micronas
In each field two sets of measurements can be taken:
a) The picture tube measurement returns results for
–
cutoff R
–
cutoff G
–
cutoff B
–
white drive R or G or B (sequentially)
b) The picture measurement returns data on
–
active picture maximum current
–
active picture minimum current
The tube measurement is automatically started when
the cutoff blue result register is read. Cutoff control for
RGB requires one field only while a complete white-drive
control requires three fields. If the measurement mode
is set to
‘
offset check
’
, a measurement cycle is run with
the cutoff/whitedrive signals set to zero. This allows to
compensate the MADC offset as well as input the
leakage currents. During cutoff and whitedrive measure-
ments, the average beam current limiter function (ref.
2.9.3.) is switched off and a programmable value is used
for the brightness setting. The start line of the tube mea-
surement can be programmed via I
2
C-bus, the first line
used for the measurement, i.e. measurement of cutoff
red, is 2 lines after the programmed start line.
The picture measurement must be enabled by the con-
trol microprocessor after reading the min./max. result
registers. If a
‘
1
’
is written into bit 2 in subaddress 25, the
measurement runs for one field. For the next measure-
ment a
‘
1
’
has to be written again. The measurement is
always started at the beginning of active video.
The vertical timing for the picture measurement is pro-
grammable, and may even be a single line. Also the sig-
nal bandwidth is switchable for the picture measure-
ment.
Two horizontal windows are available for the picture
measurement. The large window is active for the entire
active line. Tube measurement is always carried out with
the small window. Measurement windows for picture
and tube measurement are shown in Figure 2
–
23.
active video
field 1/ 2
ííí
ííííííííí
large window for active picture
small window for tube
measurement (cutoff, white drive)
picture meas. start
tube measurement
picture meas. end
Fig. 2
–
23:
Windows for tube and picture measure-
ments
2.9.2. SCART Output Signal
The RGB output of the VDP 31xxB can also be used to
drive a SCART output. In the case of the SCART signal,
the parameter CLMPR (clamping reference) has to be
set to 1. Then, during blanking, the RGB outputs are au-
tomatically set to 50% of the maximum brightness. The
DC offset values can be adjusted with the cutoff parame-
ters CR, CG, and CB. The amplitudes can be adjusted
with the drive parameters WDR, WDG, and WDB.
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