參數(shù)資料
型號(hào)： LMV791
廠商： National Semiconductor Corporation
元件分類： 運(yùn)算放大器
英文描述： 17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifier
中文描述： 17兆赫，低噪聲，CMOS輸入，1.8V的運(yùn)算放大器
文件頁(yè)數(shù)： 14/16頁(yè)
文件大?。?/td> 1005K
代理商： LMV791
Application Notes
(Continued)
frequency at which the gain starts dropping off.
Figure 7
shows the frequency response of the inverting amplifier with
different values of C
F
.
TRANSIMPEDANCE AMPLIFIER
With a wide bandwidth, low input bias current and low input
voltage and current noise, the LMV791 is ideal for wideband
transimpedance applications.
Figure 8
shows a photodiode
transimpedance amplifier used in a number of applications
such as barcode scanners, light meters, fiber optic receivers
and industrial sensors. The key components are a photo-
diode, an op amp and a feedback resistor R
F
. The voltage
around the photodiode is kept constant to avoid non-
linearities. The op amp converts the current flowing into the
resistor R
F
into a voltage at its output, and hence provides
the transimpedance gain.
An interesting aspect of this type of amplifiers, also known as
I-V converters, is that in most cases the frequency response
of the circuit needs to be modified to prevent oscillations.
The capacitance at the input of the op amp includes the
diode parasitic capacitance C
D
as well as the op amp
common-mode capacitance C
. This high capacitance
combines with a large R
, needed for a reasonable transim-
pedance gain, to create a phase shift around the loop, which
results in oscillation at high frequencies.
A feedback capacitance C
is usually added in parallel with
R
to maintain circuit stability and control the frequency
response. To achieve a maximally flat, 2nd-order Butterworth
response, the feedback pole (R
F
and C
F
) should be set using
Equation (3)
.
(3)
Calculating C
F
from
Equation (3)
can sometimes return un-
reasonably small values (
<
2 pF), especially for high speed
applications. In these cases, its often more practical to use
the circuit shown in
Figure 9
in order to allow more reason-
able values. The new value of C’
is (1+ R
B
/R
A
) C
F
. This
relationship holds as long as R
A
<<
R
F
20116865
FIGURE 5.
20116866
FIGURE 6.
20116858
FIGURE 7.
20116869
FIGURE 8. Photodiode Transimpedance Amplifier
L
www.national.com
14
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LMV791MK 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
LMV791MK/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
LMV791MKX 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
LMV791MKX/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
LMV792 制造商:NSC 制造商全稱:National Semiconductor 功能描述:17 MHz, Low Noise, CMOS Input, 1.8V Operational Amplifiers
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