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參數資料
| 型號： | LMH6559 |
| 廠商： | National Semiconductor Corporation |
| 英文描述： | High-Speed, Closed-Loop Buffer |
| 中文描述： | 高速，閉環(huán)緩沖器 |
| 文件頁數： | 18/22頁 |
| 文件大小： | 1078K |
| 代理商： | LMH6559 |
Application Notes
(Continued)
This effect works to both sides because the circuit will not
generate radiation but the circuit is also not sensible if ex-
posed to a certain radiation level. The same is also notice-
able when placing components flat on the printed circuit
board. Standard through hole components when placed up-
right can act as an antenna causing an electric field which
could be picked up by a nearby upright component. If placed
directly at the surface of the pcb this influence is much lower.
The effect of variation for
e
r
When using pcb material the
e
has a certain shift over the
used frequency spectrum, so if necessary to work with very
accurate trace impedances one must taken into account for
which frequency region the design has to be functional.
Figure 14
(http://www.isola.de) gives an example what the
drift in
e
will be when using the pcb material produced by
Isola. If working at frequencies of 100MHz then a 50
trace
has a width of 3.04mm for standard 1.6mm FR4 pcb mate-
rial, and the same trace needs a width of 3.14mm. for
frequencies around 10GHz.
Routing power traces
Power line traces routed over a pcb should be kept together
for best practice. If not a ground loop will occur which may
cause more sensitivity to radiation. Also additional ground
trace length may lead to more ringing on digital signals.
Careful attention to power line distribution leads to improved
overall circuit performance. This is especially valid for analog
circuits which are more sensitive to spurious noise and other
unwanted signals.
As demonstrated in
Figure 15
the power lines are routed
from both sides on the pcb. In this case a current loop is
created as indicated by the dotted line. This loop can act as
an antenna for high frequency signals which makes the
circuit sensitive to R
radiation. A better way to route the
power traces can be seen in the following setup. (see
Figure
16
)
In this arrangement the power lines have been routed in
order to avoid ground loops and to minimize sensitivity to
noise etc. The same technique is valid when routing a high
frequent signal over a board which has no ground plane. In
that case is it good practice to route the high frequency
signal alongside a ground trace. A still better way to create a
pcb carrying high frequency signals is to use a pcb with a
ground plane or planes.
20064155
FIGURE 13.
20064156
FIGURE 14.
20064157
FIGURE 15.
20064158
FIGURE 16.
L
www.national.com
18
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| LMH6559MF | High-Speed, Closed-Loop Buffer |
| LMH6559MFX | High-Speed, Closed-Loop Buffer |
| LMH6559MA | High-Speed, Closed-Loop Buffer |
| LMH6559MAX | High-Speed, Closed-Loop Buffer |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| LMH6559_06 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:High-Speed, Closed-Loop Buffer |
| LMH6559MA | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6559MA/NOPB | 功能描述:運算放大器 - 運放 High-Speed, Closed- Loop Buffer RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMH6559MAX | 制造商:Texas Instruments 功能描述:OP Amp Single GP 10V 8-Pin SOIC N T/R |
| LMH6559MAX/NOPB | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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