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參數(shù)資料
| 型號： | LMC6034IM |
| 廠商： | NATIONAL SEMICONDUCTOR CORP |
| 元件分類： | 運算放大器 |
| 英文描述： | LIGHT PIPE 2WIDE 3MM ROUND |
| 中文描述： | QUAD OP-AMP, 11000 uV OFFSET-MAX, 1.4 MHz BAND WIDTH, PDSO14 |
| 封裝： | PLASTIC, SOP-14 |
| 文件頁數(shù)： | 6/12頁 |
| 文件大小： | 301K |
| 代理商： | LMC6034IM |
Applications Hint
(Continued)
The large signal voltage gain while sourcing is comparable
to traditional bipolar op amps, even with a 600
load. The
gain while sinking is higher than most CMOS op amps, due
to the additional gain stage; however, under heavy load
(600
) the gain will be reduced as indicated in the Electrical
Characteristics.
Compensating Input Capacitance
The high input resistance of the LMC6034 op amps allows
the use of large feedback and source resistor values without
losing gain accuracy due to loading. However, the circuit will
be especially sensitive to its layout when these large-value
resistors are used.
Every amplifier has some capacitance between each input
and AC ground, and also some differential capacitance be-
tween the inputs. When the feedback network around an
amplifier is resistive, this input capacitance (along with any
additional capacitance due to circuit board traces, the
socket, etc.) and the feedback resistors create a pole in the
feedback path. In the following General OperationalAmplifier
circuit, Figure 2 the frequency of this pole is
where C
is the total capacitance at the inverting input, in-
cluding amplifier input capcitance and any stray capacitance
from the IC socket (if one is used), circuit board traces, etc.,
and R
is the parallel combination of R
and R
. This for-
mula, as well as all formulae derived below, apply to invert-
ing and non-inverting op-amp configurations.
When the feedback resistors are smaller than a few k
, the
frequency of the feedback pole will be quite high, since C
is
generally less than 10 pF. If the frequency of the feedback
pole is much higher than the “ideal” closed-loop bandwidth
(the nominal closed-loop bandwidth in the absence of C
),
the pole will have a negligible effect on stability, as it will add
only a small amount of phase shift.
However, if the feedback pole is less than approximately 6 to
10 times the “ideal” 3 dB frequency, a feedback capacitor,
C
, should be connected between the output and the invert-
ing input of the op amp. This condition can also be stated in
terms of the amplifier’s low-frequency noise gain: To main-
tain stability a feedback capacitor will probably be needed if
where
is the amplifier’s low-frequency noise gain and GBW is the
amplifier’s
gain
bandwidth
low-frequency noise gain is represented by the formula
product.
An
amplifier’s
regardless of whether the amplifier is being used in inverting
or non-inverting mode. Note that a feedback capacitor is
more likely to be needed when the noise gain is low and/or
the feedback resistor is large.
If the above condition is met (indicating a feedback capacitor
will probably be needed), and the noise gain is large enough
that:
the following value of feedback capacitor is recommended:
If
the feedback capacitor should be:
Note that these capacitor values are usually significantly
smaller than those given by the older, more conservative for-
mula:
Using the smaller capacitors will give much higher band-
width with little degradation of transient response. It may be
necessary in any of the above cases to use a somewhat
larger feedback capacitor to allow for unexpected stray ca-
DS011134-3
FIGURE 1. LMC6034 Circuit Topology (Each Amplifier)
DS011134-4
S
consists of the amplifier’s input cacompensates for the pole caused by
C
F
C
S
and the feedback resistors.
FIGURE 2. General Operational Amplifier Circuit
www.national.com
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LMC6034IM/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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6034IM/NOPB | 制造商:Texas Instruments 功能描述:Operational Amplifier (Op-Amp) IC |
| LMC6034IMX | 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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6034IMX/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 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉換速度:0.89 V/us 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMC6034IN | 制造商:Rochester Electronics LLC 功能描述:- Bulk |
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