14 FN7491.5 August 28, 2012 Power Supply Bypassing and Printed Circuit Board Layout As with any high frequency device, a good pr" />
參數(shù)資料
型號: EL5178ISZ-T13
廠商: Intersil
文件頁數(shù): 6/17頁
文件大?。?/td> 0K
描述: IC DRVR TWISTED SGL 700MHZ 8SOIC
標準包裝: 2,500
放大器類型: 差分
電路數(shù): 1
輸出類型: 差分
轉(zhuǎn)換速率: 850 V/µs
增益帶寬積: 350MHz
-3db帶寬: 700MHz
電流 - 輸入偏壓: 14µA
電壓 - 輸入偏移: 1900µV
電流 - 電源: 12.5mA
電流 - 輸出 / 通道: 100mA
電壓 - 電源,單路/雙路(±): 4.75 V ~ 11 V,±2.38 V ~ 5.5 V
工作溫度: -40°C ~ 85°C
安裝類型: 表面貼裝
封裝/外殼: 8-SOIC(0.154",3.90mm 寬)
供應(yīng)商設(shè)備封裝: 8-SOIC
包裝: 帶卷 (TR)
EL5178, EL5378
14
FN7491.5
August 28, 2012
Power Supply Bypassing and Printed Circuit
Board Layout
As with any high frequency device, a good printed circuit board
layout is necessary for optimum performance. Lead lengths should
be as short as possible. The power supply pin must be well bypassed
to reduce the risk of oscillation. For normal single supply operation,
where the VS- pin is connected to the ground plane, a single 4.7F
tantalum capacitor in parallel with a 0.1F ceramic capacitor from
VS+ to GND will suffice. This same capacitor combination should be
placed at each supply pin to ground if split supplies are to be used.
In this case, the VS- pin becomes the negative supply rail.
For good AC performance, parasitic capacitance should be kept
to a minimum. Use of wire-wound resistors should be avoided
because of their additional series inductance. Use of sockets
should also be avoided if possible. Sockets add parasitic
inductance and capacitance that can result in compromised
performance. Minimizing parasitic capacitance at the amplifier's
inverting input pin is very important. The feedback resistor
should be placed very close to the inverting input pin. Strip line
design techniques are recommended for the signal traces.
As the signal is transmitted through a cable, the high frequency
signal will be attenuated. One way to compensate this loss is to
boost the high frequency gain at the receiver side.
Typical Applications
FIGURE 35. TWISTED PAIR CABLE RECEIVER
FIGURE 36. TRANSMIT EQUALIZER
FBP
RG
RF
IN+
IN-
REF
FBN
RF
RFR
RGR
IN+
IN-
REF
EL5175/
EL5375
EL5178/
EL5378
VO
50
RT
TWISTED PAIR
ZO = 100Ω
VO+
FBP
RF
IN+
IN-
REF
FBN
RF
VO-
RG
RT
RGC
CL
75
fL
fH
FREQUENCY
GAIN
(dB)
f
H
1
2
πR
GC CC
-----------------------------
f
L
1
2
πR
GCC
-------------------------
DC Gain
1
2R
F
R
G
-----------
+
=
HF
()Gain
1
2R
F
R
G
R
GC
||
--------------------------
+
=
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