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參數(shù)資料
| 型號(hào)： | LMH6725MAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | 250mA ULTRA-LOW DROPOUT POSITIVE VOLTAGE REGULATOR |
| 中文描述： | QUAD OP-AMP, 3700 uV OFFSET-MAX, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數(shù)： | 12/17頁 |
| 文件大?。?/td> | 1057K |
| 代理商： | LMH6725MAX |
Application Section
(Continued)
Inverting Gain" and "R
F
vs. Inverting Gain". These charts
provide a good place to start when selecting the best feed-
back resistor value for a variety of gain settings.
For more information see Application Note OA-13 which
describes the relationship between R
F
and closed-loop fre-
quency response for current feedback operational amplifiers.
The value for the inverting input impedance for the
LMH6723/LMH6724/LMH6725 is approximately 500
. The
LMH6723/LMH6724/LMH6725 is designed for optimum per-
formance at gains of +1 to +5V/V and 1 to 4V/V. Higher
gain configurations are still useful; however, the bandwidth
will fall as gain is increased, much like a typical voltage
feedback amplifier.
Figure 2
and
Figure 3
show the value of R
versus gain. A
higher R
is required at higher gains to keep R
from de-
creasing too far below the input impedance of the inverting
input. This limitation applies to both inverting and non-
inverting
configurations.
For
LMH6725 the input resistance of the inverting input is ap-
proximately 500
and 100
is a practical lower limit for R
.
The LMH6723/LMH6724/LMH6725 begins to operate in a
gain bandwidth limited fashion in the region where R
must
be increased for higher gains. Note that the amplifier will
operate with R
values well below 100
; however, results
will be substantially different than predicted from ideal mod-
els. In particular, the voltage potential between the Inverting
and Non-Inverting inputs cannot be expected to remain
small.
For inverting configurations the impedance seen by the
source is R
G
|| R
T
. For most sources this limits the maximum
inverting gain since R
F
is determined by the desired gain as
shown in
Figure 3
. The value of R
G
is then R
F
/Gain. Thus for
an inverting gain of 4 V/V the input impedance is equal to
100
. Using a termination resistor, this can be brought down
to match a 50
or 75
source; however, a 150
source
cannot be matched without a severe compromise in R
F
.
the
LMH6723/LMH6724/
ACTIVE FILTERS
When using any current feedback operational amplifier as an
active filter it is necessary to be careful using reactive com-
ponents in the feedback loop. Reducing the feedback imped-
ance, especially at higher frequencies, will almost certainly
cause stability problems. Likewise capacitance on the invert-
ing input should be avoided. See Application Notes OA-7
and OA-26 for more information on Active Filter applications
for Current Feedback Op Amps.
When using the LMH6723/LMH6724/LMH6725 as a low-
pass filter the value of R
F
can be substantially reduced from
the value recommended in the R
F
vs. Gain charts. The
benefit of reducing R
is increased gain at higher frequen-
cies, which improves attenuation in the stop band. Stability
problems are avoided because in the stop band additional
device bandwidth is used to cancel the input signal rather
than amplify it. The benefit of this change depends on the
particulars of the circuit design. With a high pass filter con-
figuration reducing R
will likely result in device instability
and is not recommended.
20078905
FIGURE 2. RF vs. Non-Inverting Gain
20078906
FIGURE 3. R
F
vs. Inverting Gain
20078933
FIGURE 4. Typical Application with Suggested Supply
Bypassing
L
www.national.com
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| LMH6725MAX/NOPB | 功能描述:IC OP AMP CFA 1MA QUAD 14SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:PowerWise® 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:3 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:70µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:Digi-Reel® 其它名稱:MAX4475AUT#TG16DKR |
| LMH6725MT | 制造商:Texas Instruments 功能描述:OP AMP CFB QUAD POWERWISE TSSOP14 |
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| LMH6725MTX | 制造商:Rochester Electronics LLC 功能描述: 制造商:Texas Instruments 功能描述: |
| LMH6725MTX/NOPB | 功能描述:IC OP AMP CFA 1MA QUAD 14-TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:PowerWise® 其它有關(guān)文件:Automotive Product Guide 產(chǎn)品培訓(xùn)模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標(biāo)準(zhǔn)包裝:1 系列:- 放大器類型:通用 電路數(shù):1 輸出類型:滿擺幅 轉(zhuǎn)換速率:3 V/µs 增益帶寬積:10MHz -3db帶寬:- 電流 - 輸入偏壓:1pA 電壓 - 輸入偏移:70µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:48mA 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V，±1.35 V ~ 2.75 V 工作溫度:-40°C ~ 125°C 安裝類型:表面貼裝 封裝/外殼:SOT-23-6 供應(yīng)商設(shè)備封裝:SOT-6 包裝:Digi-Reel® 其它名稱:MAX4475AUT#TG16DKR |
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