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參數(shù)資料
| 型號(hào)： | LMH6718MA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類(lèi)： | 緩沖放大器 |
| 英文描述： | 5V High-Speed RS-232 Transceivers with 0.1uF Capacitors |
| 中文描述： | DUAL BUFFER AMPLIFIER, PDSO8 |
| 封裝： | SOIC-8 |
| 文件頁(yè)數(shù)： | 13/16頁(yè) |
| 文件大?。?/td> | 846K |
| 代理商： | LMH6718MA |
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Application Section
(Continued)
POWER DISSIPATION
Follow these steps to determine the power consumption of
the LMH6718:
1. Calculate the quiescent (no-load) power: P
amp
= I
CC
(V
CC
V
EE
)
2. Calculate the RMS power at the output stage: P
= (V
V
) (I
), where V
and I
LOAD
are the voltage and
current across the external load.
3. Calculate the total RMS power: P
= P
+P
. The maxi-
mum power that the SOIC, package can dissipate at a given
temperature is illustrated in
Figure 12
. The power derating
curve for any LMH6718 package can be derived by utilizing
the following equation:
where
T
amb
= Ambient temperature (C)
θ
JA
= Thermal resistance, from junction to ambient, for a
given package (C/W)
LAYOUT CONSIDERATIONS
A proper printed circuit layout is essential for achieving high
frequency performance. National provides evaluation boards
for the LMH6718 (CLC730036-SOIC) and suggests their use
as a guide for high frequency layout and as an aid for device
testing and characterization.
General layout and supply bypassing play major roles in high
frequency performance. Follow the steps below as a basis
for high frequency layout:
Include 6.8μF tantalum and 0.1μF ceramic capacitors on
both supplies.
Place the 6.8μF capacitors within 0.75 inches of the
power pins.
Place the 0.1μF capacitors less than 0.1 inches from the
power pins.
Remove the ground plane under and around the part,
especially near the input and output pins to reduce para-
sitic capacitance.
Minimize all trace lengths to reduce series inductances.
Use flush-mount printed circuit board pins for prototyping,
never use high profile DIP sockets.
EVALUATION BOARD INFORMATION
A datasheet is available for the CLC730036 evaluation
board. The evaluation board data sheets provide:
Evaluation board schematics
Evaluation board layouts
General information about the boards
The evaluation boards are designed to accommodate dual
supplies. The boards can be modified to provide single
supply operation. For best performance; 1) do not connect
the unused supply, 2) ground the unused supply pin.
SPECIAL EVALUATION BOARD CONSIDERATION FOR
THE LMH6718
To optimize off-isolation of the LMH6718, cut the R
f
trace on
the CLC730036 evaluation boards. This cut minimizes ca-
pacitive feedthrough between the input and the output.
Fig-
ure 13
shows where to cut both evaluation boards for im-
proved off-isolation.
20040149
FIGURE 11. Transmission Line Matching
20040163
FIGURE 12. Power Derating Curve
20040152
FIGURE 13. Evaluation Board Changes
L
www.national.com
13
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6718MA/NOPB | 功能描述:BUFFER PROG DUAL HI OUT 8-SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:VIP10™ 標(biāo)準(zhǔn)包裝:1,000 系列:- 放大器類(lèi)型:電壓反饋 電路數(shù):4 輸出類(lèi)型:滿(mǎn)擺幅 轉(zhuǎn)換速率:33 V/µs 增益帶寬積:20MHz -3db帶寬:30MHz 電流 - 輸入偏壓:2nA 電壓 - 輸入偏移:3000µV 電流 - 電源:2.5mA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作溫度:-40°C ~ 85°C 安裝類(lèi)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:帶卷 (TR) |
| LMH6718MAX/NOPB | 功能描述:IC BUFFER SELECT GAIN DUAL 8SOIC RoHS:是 類(lèi)別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:VIP10™ 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(lèi)型:通用 電路數(shù):1 輸出類(lèi)型:滿(mǎn)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(lèi)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(chēng):MAX4475AUT#TG16DKR |
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| LMH6720 | 制造商:NSC 制造商全稱(chēng):National Semiconductor 功能描述:Wideband Video Op Amp; Single, Single with Shutdown and Quad |
| LMH6720J-QML | 制造商:Texas Instruments 功能描述: |
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