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參數(shù)資料
| 型號： | EL4093CS |
| 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)： | 5/16頁 |
| 文件大小： | 342K |
| 代理商： | EL4093CS |
EL4093C
300 MHz DC-Restored Video Amplifier
Applications Information
Contd
Choice of Hold Capacitor
The EL4093 has been designed to work with a
hold capacitor of 22 nF
With this value of
CHOLD the droop rate and hold step are negligi-
bly small for most applications In addition with
the special boost circuits inside the SH fast ac-
quisition is possible even using a hold capacitor
of this size Figure 5 below shows the input and
output of the DC-restored amplifier while the
SH is in sample mode Applying a a1V step to
the non-inverting input of the CFA the output
of the CFA jumps to a2V The SH however
then tries to autozero the system by driving the
CFA output back to the reference voltage Since
the input differential across the SH is initially
a
2V
the boost circuits turn on and supply
85 mA of charge current to the hold capacitor
The boost circuit remains on until the CFA out-
put has come to within 50 mV of the reference
Note that this event took only 320 ns settling to
within 1% of the final value takes another 2
ms
Thus for a 1V input step acquisition takes only
one to two NTSC scan lines
4093 – 41
Figure 5 Autozero Mechanism Restores
Amplifier Output to Ground
after a1V Step at Input
A natural question arises as to whether there are
other CHOLD values that can be used In one di-
rection increasing CHOLD will further reduce the
droop and hold step but lengthen the acquisition
time Since the droop and hold step are already
small to begin with there is no apparent advan-
tage to increasing CHOLD
In the other direction decreasing CHOLD would
increase the droop and hold step but shorten the
acquisition time There is however a caveat to
reducing CHOLD too small a CHOLD would
cause the autozero loop to oscillate The reason is
that when the SH boost circuit turns on the
input stage gm increases drastically and the cir-
cuit becomes nonlinear
A sufficiently large
CHOLD must be used to suppress the non-lineari-
ty and force the loop to settle For example it
has been found that a CHOLD of 470 pF results in
1VP-P oscillation around 10 MHz at the CFA
output
The minimum recommended value for CHOLD is
22 nF With this value the loop remains stable
over the entire operating temperature range
(b40 Cto a85 C) The greatest instability oc-
curs at low temperatures where we observe from
the performance curves that the SH gm’s and
hence the GBWP are at their maximum If the
operating range is restricted to room temperature
or above then 15 nF is sufficient to keep the
loop stable At this value of CHOLD the acquisi-
tion time reduces to about 15
ms
Video Performance and Application
Although the EL4093 is intended for high speed
video applications such as SVGA it also offers
excellent performance for NTSC with 004% dG
and 002 dP at 358 MHz Some application con-
siderations however are required for handling
NTSC signals
Referring back to Figure 2 recall that typically
the autozero interval lies in the back porch por-
tion of video containing the colorburst pulse
When the SH compares the video to the refer-
ence voltage during this period the colorburst
(40 IREP-P) triggers the SH boost circuit and
prevents the autozero loop from settling
13
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| 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/信號漸弱器) |
| EL4094 | Video Gain Control/Fader |
| EL4094CN | Video Gain Control/Fader |
| EL4094CS | Video Gain Control/Fader |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| EL4093CSZ-T13 | 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) |
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