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參數(shù)資料
| 型號： | LMH6560MA |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 緩沖放大器 |
| 英文描述： | Quad, High-Speed, Closed-Loop Buffer |
| 中文描述： | BUFFER AMPLIFIER, PDSO14 |
| 封裝： | SOIC-14 |
| 文件頁數(shù)： | 18/23頁 |
| 文件大?。?/td> | 1104K |
| 代理商： | LMH6560MA |
Application Notes
(Continued)
noticeable. This causes a distinctive dip in the output fre-
quency sweep and this dip varies depending upon the par-
ticular capacitor as seen in
Figure 10
.
To minimize peaking due to C
L
a series resistor for the
purpose of isolation from the output stage should be used. A
low valued resistor will minimize the influence of such a load
capacitor. In a 50
system as is common in high frequency
circuits a 50
series resistor is often used. Usage of the
series resistor, as seen in
Figure 11
eliminates the peaking
but not the dip. The dip will vary with the particular capacitor.
Using a resistor in series with a capacitor creates a rolloff of
6db/octave. Choice of a higher valued resistor, for example
500
to 1k
, and a capacitor of hundreds of pf’s provides
the expected response at lower frequencies. However, at
high frequencies the internal inductance is appreciable and
forms with the capacitor a series LC combination.
USING GROUND PLANES
A ground plane on a printed circuit board provides for a low
ohmic connection everywhere on the board for use in con-
necting supply voltages or grounds. Multilayer boards often
make use of inner conductive layers for routing supply volt-
ages. These supply voltage layers form a complete plane
rather than using discrete traces to connect the different
points together for the specified supply. Signal traces on the
other hand are routed on outside layers both top and bottom.
This allows for easy access for measurement purposes.
Fortunately, only very high density boards have signal layers
in the middle of the board. In an earlier section, the formula
for Z was derived as:
(6)
The width of a trace is determined by the thickness of the
board. In the case of a multilayer board the thickness is the
space between the trace and the first supply plane under this
trace layer. By common practice, layers do not have to be
evenly divided in the construction of a pcb. Refer to
Figure
12
. The design of a transmission line design over a pcb is
based upon the thickness of the different internal layers and
the
e
r of the board material. The pcb manufacturer can
supply information about important specifications. For ex-
ample, a nominal 1.6mm thick pcb produces a 50
trace for
a calculated width of 2.9mm. If this layer has a thickness of
0.35mm and for the same
e
r, the trace width for 50
should
be of 0.63mm, as calculated from Equation 7, a derivation
from Equation 6.
(7)
Using a trace over a ground plane has big advantages over
the use of a standard single or double sided board. The main
advantage is that the electric field generated by the signal
transported over this trace is fixed between the trace and the
ground plane e.g. there is almost no possibility of radiation.
20064251
FIGURE 10.
20064252
FIGURE 11.
20064255
FIGURE 12.
L
www.national.com
18
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMH6560MA/NOPB | 功能描述:IC BUFF QUAD H/S C-LOOP 14-SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:LMH® 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉換速率: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 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| LMH6560MAX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Quad, High-Speed, Closed-Loop Buffer |
| LMH6560MAX/NOPB | 功能描述:IC BUFFER QD CLOSED LOOP 14-SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:LMH® 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉換速率: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 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
| LMH6560MT | 制造商:Texas Instruments 功能描述:BUFFER QUAD 680MHZ CLOSED-LOOP SMD |
| LMH6560MT/NOPB | 功能描述:IC BUFF QUAD H/S C-LOOP 14-TSSOP RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:LMH® 標準包裝:1,000 系列:- 放大器類型:電壓反饋 電路數(shù):4 輸出類型:滿擺幅 轉換速率: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 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:帶卷 (TR) |
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