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參數(shù)資料
| 型號： | LMC6084IN |
| 英文描述： | Voltage-Feedback Operational Amplifier |
| 中文描述： | 電壓反饋運算放大器 |
| 文件頁數(shù)： | 9/15頁 |
| 文件大?。?/td> | 366K |
| 代理商： | LMC6084IN |
Typical Performance Characteristics
V
S
=
±
7.5V, T
A
= 25C unless otherwise specified (Continued)
Application Hints
AMPLIFIER TOPOLOGY
The topology chosen for the LMC6022 is unconventional
(compared to general-purpose op amps) in that the tradi-
tional unity-gain buffer output stage is not used; instead, the
output is taken directly from the output of the integrator, to al-
low rail-to-rail output swing. Since the buffer traditionally de-
livers the power to the load, while maintaining high op amp
gain and stability, and must withstand shorts to either rail,
these tasks now fall to the integrator.
As a result of these demands, the integrator is a compound
affair with an embedded gain stage that is doubly fed forward
(via C
and C
) by a dedicated unity-gain compensation
driver. In addition, the output portion of the integrator is a
push-pull configuration for delivering heavy loads. While
sinking current the whole amplifier path consists of three
gain stages with one stage fed forward, whereas while
sourcing the path contains four gain stages with two fed
forward.
The large signal voltage gain while sourcing is comparable
to traditional bipolar op amps for load resistance of at least 5
k
. The gain while sinking is higher than most CMOS op
amps, due to the additional gain stage; however, when driv-
ing load resistance of 5 k
or less, the gain will be reduced
as indicated in the Electrical Characteristics. The op amp
can drive load resistance as low as 500
without instability.
COMPENSATING INPUT CAPACITANCE
Refer to the LMC660 or LMC662 datasheets to determine
whether or not a feedback capacitor will be necessary for
compensation and what the value of that capacitor would be.
CAPACITIVE LOAD TOLERANCE
Like many other op amps, the LMC6022 may oscillate when
its applied load appears capacitive. The threshold of oscilla-
tion varies both with load and circuit gain. The configuration
most sensitive to oscillation is a unity-gain follower. See the
Typical Performance Characteristics.
The load capacitance interacts with the op amp’s output re-
sistance to create an additional pole. If this pole frequency is
sufficiently low, it will degrade the op amp’s phase margin so
that the amplifier is no longer stable at low gains. The addi-
tion of a small resistor (50
to 100
) in series with the op
amp’s output, and a capacitor (5 pF to 10 pF) from inverting
input to output pins, returns the phase margin to a safe value
without interfering with lower-frequency circuit operation.
Thus, larger values of capacitance can be tolerated without
oscillation. Note that in all cases, the output will ring heavily
when the load capacitance is near the threshold for
oscillation.
Stability vs Capacitive Load
DS011236-4
Note:
Avoid resistive loads of less than 500
, as they may cause
instability.
Stability vs Capacitive Load
DS011236-5
DS011236-6
FIGURE 1. LMC6022 Circuit Topology (Each Amplifier)
L
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9
This Material Copyrighted by Its Respective Manufacturer
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6084IN/NOPB | 功能描述:IC OP AMP PREC CMOS QUAD 14-DIP RoHS:是 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) |
| LMC6084LM | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision CMOS Quad Operational Amplifier |
| LMC6084LN | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Precision CMOS Quad Operational Amplifier |
| LMC610CSC | 制造商:BLACK BOX 功能描述:SNMP MANAGEABLE MODULE |
| LMC622AE-LH-W1 | 制造商:Black Box Corporation 功能描述:1 YEAR WARRANTY FOR LMC622AE-LH |
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