參數(shù)資料
型號(hào)： LMC6684AIMX
廠商： NATIONAL SEMICONDUCTOR CORP
元件分類： 運(yùn)算放大器
英文描述： Low Voltage, Rail-To-Rail Input and Output CMOS
中文描述： QUAD OP-AMP, 1000 uV OFFSET-MAX, 1.2 MHz BAND WIDTH, PDSO16
封裝： SOP-16
文件頁(yè)數(shù)： 16/24頁(yè)
文件大?。?/td> 750K
代理商： LMC6684AIMX
5.0 Printed-Circuit-Board Layout
for High-Impedance Work
(Continued)
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 in-
sulator. 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
13
6.0 Powerdown
6.1 PINOUT FOR THE LMC6681/LMC6682/LMC6684
For the LMC6681/2/4, the input, output, and power pins are
the same as those used in the standard configuration. One
of the other pins, pin 5 in the case of the LMC6681, is used
to enable the powerdown mode. The connection diagrams
for the LMC6681/2/4 are on the front page of the datasheet.
The LMC6684 has 2 powerdown options. Each of the power-
down pins disables two amplifiers. If both the powerdown
pins are pulled high, all four amplifiers will be disabled. Re-
ferring to the connection diagrams on the front page of the
datasheet, Pin 5 disables amplifiers B and C and Pin 13 dis-
ables amplifiers A and D.
6.2 EXPLANATION OF DATASHEET PARAMETERS
The LMC6681/2/4 is ON (meets all the datasheet specs)
when the voltage applied to the powerdown pin, V
is a
logic low. The device is OFF when V
is a logic high. These
logic levels are indicated in the test conditions in the
datasheet tables. Summarizing these numbers:
Supply
Voltage
2.2V
3V
5V
10V
In applications where the powerdown pin is not connected
externally, it is pulled to a logic low internally through a cur-
rent source. The t
and t
specs will essentially be the
same for a V
in the specified range. This means that the
LMC6681/2/4 will typically be fully operational 50 μs after a
logic low has been applied to the powerdown pin. Please
note that the frequency of V
PD
in the test circuit below is
5 Hz.
Logic High [V]
at room
V
PD
≥
1.5
V
PD
≥
2.3
V
PD
≥
4.3
V
PD
≥
9.3
Logic Low [V]
at room
V
PD
≤
0.4
V
PD
≤
0.6
V
PD
≤
0.9
V
PD
≤
1.2
over temp
V
PD
≥
1.65
V
PD
≥
2.45
V
PD
≥
4.45
V
PD
≥
9.45
over temp
V
PD
≤
0.25
V
PD
≤
0.45
V
PD
≤
0.75
V
PD
≤
1.05
DS012042-19
Inverting Amplifier
DS012042-20
Non-Inverting Amplifier
DS012042-21
Follower
FIGURE 12. Typical Connections of Guard Rings
DS012042-22
(Input pins are lifted out of PC board and soldered directly to components.
FIGURE 13. Air Wiring
www.national.com
16
相關(guān)PDF資料
PDF描述
LMC6684AIN Low Voltage, Rail-To-Rail Input and Output CMOS
LMC6684BIM Low Voltage, Rail-To-Rail Input and Output CMOS
LMC6684BIMX Low Voltage, Rail-To-Rail Input and Output CMOS
LMC6684BIN Low Voltage, Rail-To-Rail Input and Output CMOS
LMC6681B1MX Low Voltage, Rail-To-Rail Input and Output CMOS
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
LMC6684AIN 功能描述:IC OP AMP QUAD LO VOLT R-R 16DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(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)
LMC6684BIM 功能描述:IC OP AMP QUAD LO VLT R-R 16SOIC RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(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)
LMC6684BIMX 制造商:Rochester Electronics LLC 功能描述:- Bulk 制造商:Texas Instruments 功能描述:
LMC6684BIN 功能描述:IC OP AMP QUAD LO VOLT R-R 16DIP RoHS:否 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標(biāo)準(zhǔn)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(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)
LMC668ACJ 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Chopper-Stabilized Operational Amplifier
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