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參數(shù)資料
| 型號： | LMC6035IMMX |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運動控制電子 |
| 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, PDSO8 |
| 封裝： | 0.150 INCH, MSOP-8 |
| 文件頁數(shù)： | 14/20頁 |
| 文件大小： | 790K |
| 代理商： | LMC6035IMMX |
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 configu-
ration 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. As shown
in Figure 10 the addition of a small resistor (50
–100
) in
series with the op amp’s output, and a capacitor (5 pF–10
pF) from inverting input to output pins, returns the phase
margin
to
a
safe
value
lower-frequency circuit operation. Thus, larger values of ca-
pacitance 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.
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 re-
sistance 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 raise will be under 4.5C.
For application information specific to micro SMD, see Appli-
cation note AN-1112.
without
interfering
with
Capacitive load driving capability is enhanced by using a pull
up resistor to V
+
(Figure 11). Typically a pull up resistor con-
ducting 500 μA or more will significantly improve capacitive
load responses. The value of the pull up resistor must be de-
termined based on the current sinking capability of the ampli-
fier 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).
DS012830-8
(a) Inverting Amplifier
DS012830-10
(c) Follower
DS012830-9
(b) Non-Inverting Amplifier
DS012830-11
(d) Howland Current Pump
FIGURE 9. Guard Ring Connections
DS012830-5
FIGURE 10. Rx, Cx Improve Capacitive Load Tolerance
DS012830-6
FIGURE 11. Compensating for Large
Capacitive Loads with a Pull Up Resistor
L
www.national.com
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6035IMMX/NOPB | 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 |
| LMC6035IMQ1 | 制造商:Texas Instruments 功能描述:IC OPAMP GP 1.4MHZ RRO 8SOIC 制造商:Texas Instruments 功能描述:Low Power 2.7V CMOS Op Amp |
| LMC6035IMX | 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 |
| LMC6035IMX/NOPB | 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 |
| LMC6035IMXQ1 | 制造商:Texas Instruments 功能描述:IC OPAMP GP 1.4MHZ RRO 8SOIC 制造商:Texas Instruments 功能描述:Low Power 2.7V CMOS Op Amp |
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