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參數(shù)資料
| 型號： | 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 |
| 文件頁數(shù)： | 3/16頁 |
| 文件大小： | 342K |
| 代理商： | EL4093CN |
EL4093C
300 MHz DC-Restored Video Amplifier
Applications Information
Contd
Autozero Range
The autozero range is defined as the difference
between the input DC level and the reference
voltage to restore to The size of this range is a
function of the gain setting resistors used and the
SH output current swing For a gain of a2 the
optimum feedback resistor is 750
X and the avail-
able SH output current is g55 mA minimum
To determine the autozero range for this case we
refer to Figure 3 below
4093 – 39
Figure 3
Suppose that the input DC level is aVDC and
that the reference voltage is 0V We know that in
feedback the following two conditions will exist
on the CFA first its output will be equal to 0V
(due to autozero) and second its VINb voltage
is equal to the VINa voltage (ie VINbe
a
VDC) So we have a potential difference of
a
VDC across both RF and RG resulting in a cur-
rent IRF e IRG e VDC 750X that must flow
into each of them This current IAZ e (IRF a
IRG) must come from the SH output Since the
maximum that IAZ can be is 55 mA we can solve
for VDC using the following
IAZ e g55 mA e 2
VDC
750
X
J
and see that VDC e g2V This range can easily
accommodate most video signals
As another example consider the case where we
are restoring to a reference voltage of a075V
Using the same reasoning as above a current IRF
e
(VDC b 075V)RF must flow through RF
and a current IRG e VDC RG must go into RG
Again our boundary condition is that IRF a IRG
s
g
55 mA and we can solve for the allowable
VDC values using the following
g
55 mA e
VDC b 075V
750
X
a
VDC
750
X
Hence VDC must be between a24V to b17V
This example illustrates that when the reference
changes the autozero range also changes In gen-
eral
the user should determine the autozero
range for hisher application and ensure that the
input signal is within this range during the au-
tozero period
Autozero Loop Bandwidth
The gain-bandwidth product (GBWP) of the au-
tozero loop is determined by the size of the hold
capacitor the value of RF and the transconduct-
ances (gm’s) of the SH amplifier To begin the
SH amplifier is modeled as in Figure 4 below
First the input stage transconductance is repre-
sented by gm1 with the compensation capacitor
given by CHOLD This stage’s GBWP is thus
gm1(2
q
CHOLD) e 1(2q (350X)(22 nF))
e
207 kHz Next since the SH has a current
output its output stage can be modeled as a
transconductance gm2 in this case having a val-
ue of 1(500
X) The current from gm2 then flows
through the I to V converter made up of the CFA
and RF to produce a voltage gain Thus the
GBWP of the overall loop is given by
GBWP e
gm1
2
q
CHOLD
(gm2
RF)
11
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| EL4094C | Video Gain Control/Fader(視頻增益控制器/信號漸弱器) |
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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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