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參數(shù)資料
| 型號(hào)： | ZXFV202N8 |
| 文件頁(yè)數(shù)： | 4/7頁(yè) |
| 文件大?。?/td> | 168K |
| 代理商： | ZXFV202N8 |
APPLICATIONS INFORMATION
Introduction
AtypicalcircuitapplicationisshowninFigure1,above.
This is suitable for 75
transmission line connections
at both the input and the output and is useful for
distribution of wide-band signals such as video and
xDSL via cables. The 75
reverse terminating resistor
R4 gives the correct matching condition to a
terminatedvideocable.Theamplifierloadisthen150
in parallel with the local feedback network.
The wide bandwidth of this device necessitates some
care in the layout of the printed circuit. Partly for this
reason, an Evaluation Circuit board is available and is
described in a later paragraph. A continuous ground
plane is required under the device and its signal
connection paths, to provide the shortest possible
ground return paths for signals and power supply
filtering.
A double-sided or multi-layer PCB
construction is required, with plated-through via holes
providing closely spaced low-inductance connections
from some components to the continuous ground
plane (someoftheseholesarenotvisibleinthefigures
for the Evaluation Circuit Board – artworks and NC drill
output can be provided if required).
For the power supply filtering, low inductance surface
mount capacitors are normally required. It has been
found that very good RF decoupling is provided on
each supply using a 1000pF NPO size 0805 or smaller
ceramic surface mount capacitor, closest to the device
pin, with an adjacent 0.1 F X7R capacitor.
configurations are possible and it may be found that a
single 0.01uF X7R capacitor on each supply gives good
results. However this should be supported by larger
decoupling capacitors elsewhere on the printed circuit
board.
Values of 1 to 10
particularly where the voltageF are recommended,
more than a few inches from the device. These larger
capacitors are recommended to be solid tantalum
electrolytic or ceramic types.
Other
Note particularly that the inverting input of this current
feedback type of amplifier is sensitive to small
amounts of capacitance to ground which occur as part
of the practical circuit board layout. This capacitance
affects bandwidth, frequency response peaking and
pulse overshoot.
Therefore to minimise this
capacitance, the feedback components R2 and R3 of
Figure1 should be positioned as close as possible to
the inverting input connection.
The frequency response and pulse response will vary
according to particular values of resistors and layout
capacitance.
The response can be tailored for the
application to some extent by choice of the value of
feedback resistor.
Figure 2 shows an oscilloscope
display of the pulse response of the Evaluation Circuit
described below for RF = 510 .
Customer Evaluation Circuit
Figures 4 and 5 show the schematic and copper layout
of a double-sided printed circuit board suitable for
evaluationofthedeviceinthelaboratory. Apartslistis
provided below.
This layout serves as a useful
example for many applications, showing the practical
implementation of the advice given above in the
Introduction.
BNC connector sockets allow connection to test
instrumentsvia50
cables. Theoutputcircuitincludes
a resistor matching circuit to present a load of 150
ohms to the amplifier and simultaneously provide 50
ohms output impedance. The attenuation of this
matching circuit is 15.45 dB.
configured for a voltage gain of 2, the overall gain is:
As the amplifier is
6 - 15.45 = -9.45dB.
EVALUATION CIRCUIT PARTS LIST:
ZXFV202
ISSUE 2 - JUNE 2002
4
QTY
CCT-REF
VALUE DESCRIPTION
Resistors, surface mount
1
R1,
51R
0805
2
R2,R3
1k
0805
1
R4
120R
0805
1
R5
10R
0805
1
R6
62R
0805
Capacitors, surface mount
2
C1,C2
1nF
25V ceramic 0805 X7R
2
C3,C4
100nF
50V ceramic 0805 NPO
2
C5,C6
10 F
16V Tant Elec size C
Integrated Circuits
1
U1
Zetex ZXFV202N8
Miscellaneous
2
J1,J2
BNC Socket, PCB
straight flange, e.g.
Tyco
B35N14H999X99
1
J3
3-way PCB screw
terminal block IMO
20.501/3SB
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| ZXFV202N8EV | 功能描述:視頻放大器 1ch 300MHz CFB amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| ZXFV202N8TA | 功能描述:視頻放大器 240 MHz RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
| ZXFV202N8TC | 功能描述:IC AMPLIFIER VIDEO SGL 8-SOIC RoHS:是 類別:集成電路 (IC) >> 線性 - 放大器 - 視頻放大器和頻緩沖器 系列:- 標(biāo)準(zhǔn)包裝:1,000 系列:- 應(yīng)用:驅(qū)動(dòng)器 輸出類型:差分 電路數(shù):3 -3db帶寬:350MHz 轉(zhuǎn)換速率:1000 V/µs 電流 - 電源:14.5mA 電流 - 輸出 / 通道:60mA 電壓 - 電源，單路/雙路(±):5 V ~ 12 V，±2.5 V ~ 6 V 安裝類型:表面貼裝 封裝/外殼:20-VFQFN 裸露焊盤 供應(yīng)商設(shè)備封裝:20-QFN 裸露焊盤（4x4） 包裝:帶卷 (TR) |
| ZXFV203 | 制造商:ZETEX 制造商全稱:ZETEX 功能描述:Quad, single, triple and dual video amplifiers |
| ZXFV203EV | 功能描述:視頻放大器 3ch 300MHz CFB amp RoHS:否 制造商:ON Semiconductor 通道數(shù)量:4 電源類型: 工作電源電壓:3.3 V, 5 V 電源電流: 最小工作溫度: 最大工作溫度: 封裝 / 箱體:TSSOP-14 封裝:Reel |
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