參數(shù)資料
型號(hào)： EL4093CN
元件分類： 視頻放大器
英文描述： 300 MHz DC-Restored Video Amplifier
中文描述： 300兆赫的DC -恢復(fù)視頻放大器
文件頁(yè)數(shù)： 2/16頁(yè)
文件大?。?/td> 342K
代理商： EL4093CN
EL4093C
300 MHz DC-Restored Video Amplifier
Applications Information
Contd
Power Supply Bypassing and Printed
Circuit Board Layout
As with any high frequency device good printed
circuit board layout is necessary for optimum
performance Ground plane construction is high-
ly recommended Lead lengths should be as short
as possible The power supply pins must be well
bypassed to reduce the risk of oscillation In the
EL4093C there are two sets of supply pins
Va1Vb1 provide power for the CFA
and
Va2Vb2 are for the SH amplifier Good per-
formance can be achieved using only one set of
bypass capacitors although they must be close to
the Va1V-1 pins since that is where the high
frequency currents flow The combination of a
47
mF tantalum capacitor in parallel with a
001
mF capacitor has been shown to work well
Chip capacitors are recommended for the 001
mF
bypass to minimize lead inductance
For good AC performance parasitic capacitance
should be kept to a minimum especially at the
CFA inverting input Ground plane construction
should be used but it should be removed from
the area near the inverting input to minimize any
stray capacitance at that node Chip resistors are
recommended for RF and RG and use of sockets
should be avoided if possible Sockets add para-
sitic inductance and capacitance which will result
in some additional peaking and overshoot
If the CFA is configured for non-inverting gain
then one should also pay attention to the trace
leading to the ainput The inductance of a long
trace (l 3’’) can form a resonant network with
the amplifier input resulting in high frequency
oscillations around 700 MHz In such cases a
50
X – 100X series resistor placed close to the ain-
put would isolate this inductance and damp out
the resonance
Capacitance at the Inverting Input
Any manufacturer’s high-speed voltage or cur-
rent feedback amplifier can be affected by stray
capacitance at the inverting input For inverting
gains this parasitic capacitance has little effect
because the inverting input is a virtual ground
but for non-inverting gains this capacitance (in
conjunction with the feedback and gain resistors)
creates a pole in the feedback path of the amplifi-
er This pole if low enough in frequency has the
same destabilizing effect as a zero in the forward
open-loop response Hence it is important to min-
imize the stray capacitance at this node by re-
moving the nearby ground plane In addition
since the SH output connects to this node it is
important to minimize the trace capacitance
Good practice here would be to connect the two
pins with a short trace directly underneath the
chip
Feedback Resistor Values
The EL4093C has been optimized for a gain of
a
2 with RF e 750X This value of feedback re-
sistor givesa3dB bandwidth of 300 MHz at a
gain of a2 driving a 150
X load Since the ampli-
fier inside the EL4093C uses current mode feed-
back it is possible to change the value of RF to
adjust the bandwidth Shown in the table below
are optimum feedback resistor values for differ-
ent closed loop gains
Gain
Optimum RF
BW (MHz)
Peaking (dB)
a
1
910
314
02
a
2
750
300
0
a
5
470
294
02
b
1
680
300
0
Autozero Interface
The autozero interface refers to the connection
between the SH output and the CFA inverting
input This interface has been greatly simplified
compared to that of the EL2090C in that the
SH output is a high impedance current source
The SH output can be connected directly to the
inverting input and its high impedance greatly
reduces the interaction between the sample
hold and the gain setting resistors Another vir-
tue of this interface is better gain linearity as the
autozero current changes For example at an au-
tozero current of 0 mA the output impedance is
about 5 M
X dropping to 1 MX as the autozero
current increases to 3 mA Using RF e RG e
750
X
the closed loop gain changes only by
0025% in this interval
10
相關(guān)PDF資料
PDF描述
EL4093CS 300 MHz DC-Restored Video Amplifier
EL4093C 300 MHz DC-Restored Video Amplifier(300MHz 直流恢復(fù)放大器)
EL4094C Video Gain Control/Fader(視頻增益控制器/信號(hào)漸弱器)
EL4094 Video Gain Control/Fader
EL4094CN Video Gain Control/Fader
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
EL4093CS 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:否 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)
EL4093CS-T13 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:否 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)
EL4093CS-T7 功能描述:IC VIDEO AMP 300MHZ 16-SOIC RoHS:否 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)
EL4093CSZ 功能描述:IC VIDEO AMP 300MHZ 16-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)
EL4093CSZ 制造商:Intersil Corporation 功能描述:Video Buffer / Amplifier IC
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