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參數(shù)資料
| 型號(hào)： | ADV7150LS135 |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 顯示控制器 |
| 英文描述： | CMOS 220 MHz True-Color Graphics Triple 10-Bit Video RAM-DAC |
| 中文描述： | PALETTE-DAC DSPL CTLR, PQFP160 |
| 封裝： | POWER, PLASTIC, QFP-160 |
| 文件頁(yè)數(shù)： | 24/36頁(yè) |
| 文件大?。?/td> | 447K |
| 代理商： | ADV7150LS135 |
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ADV7150
–24–
REV. A
DIGIT AL-T O-ANALOG CONVE RT E RS
(DACS) AND VIDE O OUT PUT S
T he ADV7150 contains three high speed video DACs. T he
DAC outputs are represented as the three primary analog color
signals IOR (red video), IOG (green video) and IOB (blue video).
Other analog signals on the part include I
PLL
and V
REF
as well as
complementary video outputs
IOR
,
IOG
,
IOB
. T hese comple-
mentary outputs can be used to drive differentially terminated
video loads, they will have equal but opposite output levels to
IOR, IOG and IOB when loaded with a resistive load similar to
IOR, IOG and IOB.
DACs and Analog Outputs
T he part contains three matched 10-bit digital-to-analog con-
verters. T he DACs are designed using an advanced, high speed,
segmented architecture. T he bit currents corresponding to each
digital input are routed to either IOR, IOG, IOB (bit = “l(fā)”) or
IOR
,
IOG
,
IOB
(bit = “0”). (Normally
IOR
,
IOG
,
IOB
= GND.)
T he analog video outputs are high impedance current sources.
Each of the these three RGB current outputs are specified to
directly drive a 37.5
load (doubly terminated 75
).
DACs
IOR, IOG, IOB
ZO = 75
ZS = 75
(SOURCE
TERMINATION)
ZL = 75
(MONITOR)
(CABLE)
Figure 29. DAC Output Termination (Doubly Terminated
75
Load)
Reference Input and R
SE T
An external 1.23 V voltage reference is required to drive the
analog outputs of the ADV7150. T he reference voltage is con-
nected to the V
REF
input.
A resistor R
SET
is connected between the R
SET
input of the part
and ground. For specified performance, R
SET
has a value of
280
. T his corresponds to the generation of RS-343A video
levels (with
SYNC
on IOG and Pedestal = 7.5 IRE) into a dou-
bly terminated 75
load. Figure 30 illustrates the resulting
video waveform, and the Video Output T ruth T able shows the
corresponding control input stimuli.
WHITE
LEVEL
IOR, IOB
mA
IOG
mA
V
V
26.67
1.000
0.714
19.05
0
0
0
0
7.62
0.286
BLANK
LEVEL
SYNC
LEVEL
GRAYSCAE
92.5 IRE
7.5 IRE
40 IRE
BLACK
LEVEL
1.44
0.054
9.05
0.340
Figure 30. Composite Video Waveform (
SYNC
Decoded
on IOG; Pedestal = 7.5 IRE; R
SET
= 280
)
Variations on RS-343A
Various other video output configurations can be implemented
by the ADV7150, including RS-170. Values of R
SET
for particu-
lar output video formats/levels are calculated by using the equa-
tions for R
SET
given in the “Pin Configuration” section. T he
table shows calculated values of R
SET
for some of the most com-
mon variants on the RS-343A standard. T he associated wave-
forms are shown in the diagrams.
T able V. Video Output T ruth T able
IOG
(mA)
IOR, IOB
(mA)
DAC
Input Data
Description
SYNC
BLANK
WHIT E LEVEL
VIDEO
VIDEO to
BLANK
BLACK LEVEL
BLACK to
BLANK
BLANK
LEVEL
SYNC
LEVEL
26.67
Video + 9.05
Video + 1.44
9.05
1.44
7.62
0
19.05
Video + 1.44
Video + 1.44
1.44
1.44
0
0
1
1
0
1
0
1
0
1
1
1
1
1
0
0
3FFH
Data
Data
000H
000H
xxxH
xxxH
Decoded on IOG; Pedestal = 0 IRE; R
SET
= 265
.
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