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參數(shù)資料
| 型號： | LMC6484AIMX/NOPB |
| 廠商： | National Semiconductor |
| 文件頁數(shù)： | 6/24頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC OP AMP QUAD CMOS R-R 14-SOIC |
| 標(biāo)準包裝： | 1 |
| 放大器類型： | 通用 |
| 電路數(shù)： | 4 |
| 輸出類型： | 滿擺幅 |
| 轉(zhuǎn)換速率： | 1.3 V/µs |
| 增益帶寬積： | 1.5MHz |
| 電流 - 輸入偏壓： | 0.02pA |
| 電壓 - 輸入偏移： | 110µV |
| 電流 - 電源： | 2.6mA |
| 電流 - 輸出 / 通道： | 30mA |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 15.5 V，±1.5 V ~ 7.75 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-SOICN |
| 包裝： | 標(biāo)準包裝 |
| 產(chǎn)品目錄頁面： | 1266 (CN2011-ZH PDF) |
| 其它名稱： | LMC6484AIMXDKR |
Application Information (Continued)
of the ultra-low input current of the LMC6484, typically less
than 20 fA, it is essential to have an excellent layout. Fortu-
nately, the techniques of obtaining low leakages are quite
simple. First, the user must not ignore the surface leakage of
the PC board, even though it may sometimes appear accept-
ably low, because under conditions of high humidity or dust
or contamination, the surface leakage will be appreciable.
To minimize the effect of any surface leakage, lay out a ring
of foil completely surrounding the LMC6484’s inputs and the
terminals of capacitors, diodes, conductors, resistors, relay
terminals, etc. connected to the op-amp’s inputs, as in
Fig-
ure 9. To have a significant effect, guard rings should be
placed in both the top and bottom of the PC board. This PC
foil must then be connected to a voltage which is at the same
voltage as the amplifier inputs, since no leakage current can
flow between two points at the same potential. For example,
a PC board trace-to-pad resistance of 10
12
, which is nor-
mally considered a very large resistance, could leak 5 pA if
the trace were a 5V bus adjacent to the pad of the input. This
would cause a 250 times degradation from the LMC6484’s
actual performance. However, if a guard ring is held within 5
mV of the inputs, then even a resistance of 10
11
would
cause only 0.05 pA of leakage current. See
Figure 10 for
typical connections of guard rings for standard op-amp
configurations.
The designer should be aware that when it is inappropriate
to lay out a PC board for the sake of just a few circuits, there
is another technique which is even better than a guard ring
on a PC board: Don’t insert the amplifier’s input pin into the
board at all, but bend it up in the air and use only air as an
insulator. Air is an excellent insulator. In this case you may
have to forego some of the advantages of PC board con-
struction, but the advantages are sometimes well worth the
effort
of
using
point-to-point
up-in-the-air
wiring.
See
Figure 11.
DS011714-20
FIGURE 9. Example of Guard Ring in P.C. Board
Layout
DS011714-21
Inverting Amplifier
DS011714-22
Non-Inverting Amplifier
DS011714-23
Follower
FIGURE 10. Typical Connections of Guard Rings
DS011714-24
(Input pins are lifted out of PC board and soldered directly to components.
All other pins connected to PC board.)
FIGURE 11. Air Wiring
LMC6484
www.national.com
13
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參數(shù)描述 |
|---|---|
| LMC6484AIN | 功能描述:運算放大器 - 運放 RoHS:否 制造商:STMicroelectronics 通道數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6484AIN | 制造商:Texas Instruments 功能描述:IC OP AMP QUAD CMOS 6484 DIP14 |
| LMC6484AIN/NOPB | 功能描述:運算放大器 - 運放 CMOS Quad R/R I/O Op Amp RoHS:否 制造商:STMicroelectronics 通道數(shù)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(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6484AMJ | 制造商:TI 制造商全稱:Texas Instruments 功能描述:LMC6484 CMOS Quad Rail-to-Rail Input and Output Operational Amplifier |
| LMC6484AMJ/883 | 制造商:Texas Instruments 功能描述:5962-9453402MCA CMOS QUAD RAIL TO RAIL I - Rail/Tube |
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