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參數(shù)資料
| 型號： | LMH6725MAX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 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)： | 14/17頁 |
| 文件大?。?/td> | 1057K |
| 代理商： | LMH6725MAX |
Application Section
(Continued)
LAYOUT CONSIDERATIONS
Whenever questions about layout arise, use the evaluation
board as a guide. Evaluation boards are shipped with
sample requests.
To reduce parasitic capacitances ground and power planes
should be removed near the input and output pins. Compo-
nents in the feedback loop should be placed as close to the
device as possible. For long signal paths controlled imped-
ance lines should be used, along with impedance matching
at both ends.
Bypass capacitors should be placed as close to the device
as possible. Bypass capacitors from each rail to ground are
applied in pairs. The larger electrolytic bypass capacitors
can be located anywhere on the board; however, the smaller
ceramic capacitors should be placed as close to the device
as possible.
VIDEO PERFORMANCE
The LMH6723/LMH6724/LMH6725 has been designed to
provide good performance with both PAL and NTSC com-
posite video signals. The LMH6723/LMH6724/LMH6725 is
specified for PAL signals. Typically, NTSC performance is
marginally better due to the lower frequency content of the
signal. Performance degrades as the loading is increased;
therefore, best performance will be obtained with back ter-
minated loads. The back termination reduces reflections
from the transmission line and effectively masks transmis-
sion line and other parasitic capacitances from the amplifier
output stage.
Figure 4
shows a typical configuration for
driving a 75
cable. The amplifier is configured for a gain of
2 to make up for the 6dB of loss in R
OUT
.
SINGLE 5V SUPPLY VIDEO
With a 5V supply the LMH6723/LMH6724/LMH6725 is able
to handle a composite NTSC video signal, provided that the
signal is AC coupled and level shifted so that the signal is
centered around V
CC
/2.
POWER DISSIPATION
Follow these steps to determine the maximum power dissi-
pation for the LMH6723/LMH6724/LMH6725:
1.
Calculate the quiescent (no-load) power: P
AMP
= I
CC
*
(V
S
) V
S
= V
+
- V
-
2.
Calculate the RMS power dissipated in the output stage:
P
(rms) = rms ((V
-V
)*I
) where V
and I
are the voltage and current across the external load and
V
S
is the total supply current.
3.
Calculate the total RMS power: P
T
= P
AMP
+P
D
The maximum power that the LMH6723/LMH6724/LMH6725
package can dissipate at a given temperature can be de-
rived with the following equation:
P
= (150
o
- T
AMB
)/
θ
, where T
= Ambient tempera-
ture (C) and
θ
= Thermal resistance, from junction to
ambient, for a given package (C/W). For the SOIC-8 pack-
age
θ
is 166C/W and for the SOT it is 230C/W. The
SOIC-14 has a
θ
JA
of 130C/W. The TSSOP-14 has a
θ
JA
of
160C/W.
ESD PROTECTION
The LMH6723/LMH6724/LMH6725 is protected against
electrostatic discharge (ESD) on all pins. The LMH6723/
LMH6725 will survive 2000V Human Body Model or 200V
Machine Model events.
Under closed loop operation the ESD diodes have no effect
on circuit performance. There are occasions, however, when
the ESD diodes will be evident. If the LMH6723/LMH6724/
LMH6725 is driven into a slewing condition the ESD diodes
will clamp large differential voltages until the feedback loop
restores closed loop operation.Also, if the device is powered
down and a large input signal is applied, the ESD diodes will
conduct.
20078943
FIGURE 8. Composite Amplifier Frequency Response
L
www.national.com
14
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| 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 |
| LMH6725MT/NOPB | 功能描述:IC OP AMP CFA QUAD 14-TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:PowerWise® 標(biāo)準(zhǔn)包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應(yīng)商設(shè)備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| 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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