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參數(shù)資料
| 型號： | LMC6035ITL |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運(yùn)動控制電子 |
| 英文描述： | Low Power 2.7V Single Supply CMOS Operational Amplifiers |
| 中文描述： | DUAL OP-AMP, 5000 uV OFFSET-MAX, 1.4 MHz BAND WIDTH, PBGA8 |
| 封裝： | MICRO, SMD-8 |
| 文件頁數(shù)： | 15/20頁 |
| 文件大?。?/td> | 786K |
| 代理商： | LMC6035ITL |
1.0 Application Notes
(Continued)
1.3.1 CAPACITIVE LOAD TOLERANCE
Like many other op amps, the LMC6035/6 may oscillate
when its applied load appears capacitive. The threshold of
oscillation varies both with load and circuit gain. The con-
figuration most sensitive to oscillation is a unity-gain follower.
See the Typical Performance Characteristics.
The load capacitance interacts with the op amp’s output
resistance 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. As
shown in
Figure 10
, the addition of a small resistor
(50
–100
) in series with the op amp’s output, and a ca-
pacitor (5pF–10pF) from inverting input to output pins, re-
turns 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 capaci-
tance is near the threshold for oscillation.
1.4 Micro SMD Considerations
Contrary to what might be guessed, the micro SMD package
does not follow the trend of smaller packages having higher
thermal resistance. LMC6035 in micro SMD has thermal
resistance of 220C/W compared to 230C/W in MSOP. Even
when driving a 600
load and operating from
±
7.5V sup-
plies, the maximum temperature rise will be under 4.5C. For
application information specific to micro SMD, see Applica-
tion note AN-1112.
Capacitive load driving capability is enhanced by using a pull
up resistor to V
+
(
Figure 11
). Typically a pull up resistor
conducting 500μA or more will significantly improve capaci-
tive load responses. The value of the pull up resistor must be
determined based on the current sinking capability of the
amplifier with respect to the desired output swing. Open loop
gain of the amplifier can also be affected by the pull up
resistor (see Electrical Characteristics).
01283008
(a) Inverting Amplifier
01283009
(b) Non-Inverting Amplifier
01283010
(c) Follower
01283011
(d) Howland Current Pump
FIGURE 9. Guard Ring Connections
01283005
FIGURE 10. Rx, Cx Improve Capacitive Load Tolerance
L
www.national.com
15
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6035ITL/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)放 2.7V Dual RRO CMOS 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(bǔ)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 |
| LMC6035ITLNOPB | 制造商:National Semiconductor 功能描述:OP Amp Dual GP R-R O/P 15.5V 8-Pin uSMD T/R |
| LMC6035ITLX | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power 2.7V Single Supply CMOS Operational Amplifiers |
| LMC6035ITLX/NOPB | 功能描述:運(yùn)算放大器 - 運(yùn)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(bǔ)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 |
| LMC6036 | 制造商:NSC 制造商全稱:National Semiconductor 功能描述:Low Power 2.7V Single Supply CMOS Operational Amplifiers |
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