參數(shù)資料
型號: LM7171BIWM
廠商: NATIONAL SEMICONDUCTOR CORP
元件分類: 運(yùn)動控制電子
英文描述: Very High Speed, High Output Current, Voltage Feedback Amplifier
中文描述: OP-AMP, 3500 uV OFFSET-MAX, 125 MHz BAND WIDTH, PDSO16
封裝: 0.300 INCH, SOIC-16
文件頁數(shù): 12/20頁
文件大?。?/td> 615K
代理商: LM7171BIWM
Typical Performance Characteristics
unless otherwise noted, T
A
= 25C (Continued)
Note 13:
The THD measurement at low frequency is limited by the test instrument.
Simplified Schematic Diagram
Application Notes
LM7171 Performance Discussion
The LM7171 is a very high speed, voltage feedback ampli-
fier. It consumes only 6.5 mA supply current while providing
a unity-gain bandwidth of 200 MHz and a slew rate of 4100V/
μs. It also has other great features such as low differential
gain and phase and high output current.
The LM7171 is a true voltage feedback amplifier. Unlike cur-
rent feedback amplifiers (CFAs) with a low inverting input im-
pedance and a high non-inverting input impedance, both in-
puts of voltage feedback amplifiers (VFAs) have high
impedance nodes. The low impedance inverting input in
CFAs and a feedback capacitor create an additional pole
that will lead to instability. As a result, CFAs cannot be used
in traditional op amp circuits such as photodiode amplifiers,
I-to-V converters and integrators where a feedback capacitor
is required.
LM7171 Circuit Operation
The class AB input stage in LM7171 is fully symmetrical and
has a similar slewing characteristic to the current feedback
amplifiers. In the LM7171 Simplified Schematic, Q1 through
Q4 form the equivalent of the current feedback input buffer,
R
E
the equivalent of the feedback resistor, and stage A buff-
Harmonic Distortion
vs Frequency
DS012385-74
Harmonic Distortion
vs Frequency
DS012385-75
Maximum Power Dissipation
vs Ambient Temperature
DS012385-20
DS012385-9
Note:
M1 and M2 are current mirrors.
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