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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)： | 4/16頁(yè) |
| 文件大?。?/td> | 342K |
| 代理商： | EL4093CN |
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EL4093C
300 MHz DC-Restored Video Amplifier
Applications Information
Contd
4093 – 40
Figure 4
With RF e 750X a GBWP of 310 kHz is ob-
tained Note however that this is the small signal
GBWP As mentioned earlier the sample and
hold has special boost circuits built in which pro-
vides g85 mA of charge current during full slew
These boost circuits turn on when the SH input
differential voltage exceeds g50 mV When the
boosters are turned on gm1 greatly increases and
the circuit becomes nonlinear Thus some stabili-
ty issues are associated with the boosters and
they will be addressed in a later section
Charge Injection and Hold Step
Charge injection refers to the charge transferred
to the hold capacitor when switching to the
HOLD mode The charge should ideally be 0 but
due to stray capacitive coupling and other effects
is typically 01 pC in the EL4093 This charge
changes the hold capacitor voltage by
DV e DQ
CHOLD and this DV is multiplied by the output
stage transconductance (gm2) to produce a
change in SH output current This last quantity
is listed as the spec
DISTEP and is calculated us-
ing the following
DISTEP e
DQ
CHOLD
J gm2
For CHOLD e 22 nF and gm2 e 1(500X)
DISTEP has a typical value of 100 nA This
change in SH output current flows through RF
shifting the CFA output voltage However as we
shall soon see this shift is negligible Assuming
RF e 750X DISTEP is impressed across RF to
give (750
X)(100 nA) e 008 mV of change at the
CFA output
Droop Rate
When the SH amplifier is in HOLD mode there
is a small current that leaks from the switch into
the hold capacitor This quantity is termed the
droop current
and is typically 10 nA in the
EL4093 This droop current produces a ramp in
the hold capacitor voltage which in turn produc-
es a similar effect at the CFA output The Droop
Rate at the CFA output can be found using the
equation below
Droop e
IDROOP
CHOLD
(gm2
RF)
Assuming RF e 750X and CHOLD e 22 nF the
drift in the CFA output due to droop current is
about 7
mV ms Recall that in NTSC applica-
tions there is about 60
ms between autozero peri-
ods Thus there is 7
mV ms)(60 ms) e 04 mV or
less than 01 IRE of drift over each NTSC scan
line This drift is negligible in most applications
12
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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