參數(shù)資料
型號(hào)： AD8141ACPZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 0K
描述： IC VIDEO AMP TRPL DIFF 24LFCSP
標(biāo)準(zhǔn)包裝： 5,000
應(yīng)用： 驅(qū)動(dòng)器
輸出類型： 差分
電路數(shù)： 3
-3db帶寬： 275MHz
轉(zhuǎn)換速率： 1150 V/µs
電流 - 電源： 44mA
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 5.5 V，±2.25 V ~ 2.75 V
安裝類型： 表面貼裝
封裝/外殼： 24-WFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-WQ（4x4）
包裝： 帶卷 (TR)
Data Sheet
AD8141/AD8142
Rev. A | Page 21 of 24
09
46
1-
0
43
AD8142
+
–
49.9
1k
38.3
80.6
–0.10V
–0.34V
1k
2k
+2.5V
–2.5V
2k
100
UTP
49.9
0.7V
–1.0V
–0.3V
–1.0V
–1.7V
0.7V
0V
75
VIDEO
SOURCE
1.4V
–1.0V
–1.7V
–0.3V
0.5V
AD8142 KEY SIGNAL LEVELS ON SINGLE ±2.5V SUPPLIES
AD8142 OUTPUT SIGNAL LEVELS INCLUDING COMMON-MODE HSYNC PULSES
Figure 45. AD8142 Key Signal Levels on ±2.5 V Supplies; Upper Drawing Shows Schematic, and Lower Drawing Shows Output Signals with HSYNC Pulses
DRIVING MULTIPLE OUTPUTS
The AD8141/AD8142 can drive four parallel UTP cables (50 Ω
differential load) with only 1.5% reduction in output swing (see
Figure 46). As is expected, driving fewer parallel cables results in
less output swing reduction.
0
946
1-
0
46
49.9
100
UTP
49.9
100
49.9
100
UTP
49.9
100
49.9
100
UTP
49.9
100
49.9
100
UTP
49.9
100
AD8141/AD8142
+
–
VOCM
Figure 46. Driving Four UTP Cables in Parallel
VIDEO SYNC-ON-COMMON-MODE (AD8142)
In computer video applications, the horizontal and vertical sync
signals are most often separate from the video information signals.
For example, in typical computer monitor applications, the red,
green, and blue (RGB) color signals are transmitted over separate
cables, as are the vertical and horizontal sync signals. When
transmitting these types of video signals over long distances
on UTP cable, it is desirable to reduce the required number of
physical channels. One way to do this is to encode the vertical and
horizontal sync signals as weighted sums and differences of the
output common-mode signals. The RGB color signals are each
transmitted differentially over separate physical channels. The
fact that the differential and common-mode signals are orthogonal
allows the RGB color and sync signals to be separated at the
channel’s receiver.
Cat-5 type cable contains four balanced twisted-pair physical
channels that can support both differential and common-mode
signals. Transmitting typical computer monitor video over this
cable can be accomplished by using three of the twisted pairs for
the RGB and sync signals. Each color is transmitted differentially,
one on each of the three pairs. The encoded sync signals are
transmitted among the common-mode signals of each of the
three pairs. To minimize EMI from the sync signals, the common-
mode signals on each of the three pairs produced by the sync
encoding scheme induce electric and magnetic fields that, for
the most part, cancel each other. A conceptual block diagram
of the sync encoding scheme is presented in Figure 47. Because
the AD8142 has the sync encoding scheme implemented internally,
the user simply applies the horizontal and vertical sync signals
directly to the appropriate inputs. As described in the Theory of
Operation section, the AD8142 accepts ground-referenced logic-
level sync pulses (see Table 1 for the exact levels). In many cases,
the sync pulses can be applied directly from video card VGA
connector outputs.
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