參數(shù)資料
型號(hào)： AD8148ACPZ-RL
廠商： Analog Devices Inc
文件頁(yè)數(shù)： 14/24頁(yè)
文件大?。?/td> 0K
描述： IC DRIVER TRIPLE DIFF 24-LFCSP
標(biāo)準(zhǔn)包裝： 5,000
應(yīng)用： 差分
輸出類型： 差分
電路數(shù)： 3
-3db帶寬： 900MHz
轉(zhuǎn)換速率： 3000 V/µs
電流 - 電源： 62.5mA
電流 - 輸出 / 通道： 87mA
電壓 - 電源，單路/雙路(±)： 4.5 V ~ 11 V，±2.25 V ~ 5.5 V
安裝類型： 表面貼裝
封裝/外殼： 24-VFQFN 裸露焊盤，CSP
供應(yīng)商設(shè)備封裝： 24-LFCSP-VQ（4x4）
包裝： 帶卷 (TR)
Data Sheet
AD8146/AD8147/AD8148
Rev. B | Page 21 of 24
Figure 39 illustrates the frequency response of the pre-emphasis
network.
Figure 40 illustrates the frequency response of the pre-emphasis
circuit cascaded with the cable compared with that of the cable
alone. It can be seen that the overall response is flat to within
±0.4 dB. The ±0.4 dB ripple in the response is due to the fact
that the pre-emphasis network is linear, comprised of two real-
axis pole/zero pairs, and the cable response is nonlinear.
EXPOSED PADDLE (EP)
The 24-lead LFCSP has an exposed paddle on the underside of
its body. To achieve the specified thermal resistance, it must
have a good thermal connection to one of the PCB planes. The
exposed paddle must therefore be soldered to a pad on the top
of the board that is connected to an inner plane with several
thermal vias. The AD8147/AD8148 use the paddle as a ground
reference; therefore, for these parts, the PCB plane used must be
the ground plane.
2k
500
49.9
442
82.5
487
39.2
442
487
75
100 FEET
100
UTP
AD8148
+
–
VIDEO
SOURCE
18pF
30pF
18pF
30pF
09
32
7-
04
8
Figure 38. Pre-Emphasis Network Using the AD8148 for 30 Meters of UTP Cable
12
6
FREQUENCY (MHz)
GA
IN
(
d
B
)
11
10
9
8
7
100
10
1
0.1
VS = ±5V
09
32
7-
04
9
Figure 39. AD8148 Pre-Emphasis Network Frequency Response
9
–9
0.1
FREQUENCY (MHz)
GA
IN
(
d
B
)
6
3
0
–3
–6
1
10
100
PRE-EMPHASIS
NETWORK
WITH CABLE
CABLE ALONE
VS = ±5V
09
32
7-
05
0
Figure 40. AD8148 Pre-Emphasis Network Cascaded With
30 Meters of UTP Cable vs. UTP Cable Alone
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