LMV822M National Semiconductor, LMV822M Datasheet - Page 11

Operational Amplifier (Op-Amp) IC

LMV822M

Manufacturer Part Number
LMV822M
Description
Operational Amplifier (Op-Amp) IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LMV822M

No. Of Amplifiers
1
Bandwidth
5MHz
Slew Rate
2V/µs
No. Of Pins
8
Single Supply Voltage Min (+v)
2.7V
Amplifier Type
Operational
Mounting Type
Surface Mount
Peak Reflow Compatible (260 C)
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

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Typical Performance Characteristics
T
Application Note
This application note is divided into two sections: design
considerations and Application Circuits.
DESIGN CONSIDERATIONS
This section covers the following design considerations:
1. Frequency and Phase Response Considerations
2. Unity-Gain Pulse Response Considerations
3. Input Bias Current Considerations
FREQUENCY AND PHASE RESPONSE
CONSIDERATIONS
The relationship between open-loop frequency response
and open-loop phase response determines the closed-loop
stability performance (negative feedback). The open-loop
phase response causes the feedback signal to shift towards
becoming positive feedback, thus becoming unstable. The
further the output phase angle is from the input phase angle,
the more stable the negative feedback will operate. Phase
Margin (φ
at the unity-gain crossover point. Zero degrees of phase-
margin means that the input and output are completely in
phase with each other and will sustain oscillation at the
unity-gain frequency.
The AC tables show φ
changes with load. The Gain and Phase margin vs Fre-
quency plots in the curve section can be used to graphically
determine the φ
examine the phase angle portion of the plot, find the phase
margin point at the unity-gain frequency, and determine how
far this point is from zero degree of phase-margin. The larger
the phase-margin, the more stable the circuit operation.
The bandwidth is also affected by load. The graphs of Figure
1 and Figure 2 provide a quick look at how various loads
affect the φ
family. These graphs show capacitive loads reducing both
φ
width but increase the φ
m
A
= 25˚C. (Continued)
and bandwidth, while resistive loads reduce the band-
m
) specifies this output-to-input phase relationship
m
and the bandwidth of the LMV821/822/824
m
for various loaded conditions. To do this,
m
m
. Notice how a 600Ω resistor can be
for a no load condition. But φ
THD vs. Frequency
m
Unless otherwise specified, V
11
added in parallel with 220 picofarads capacitance, to in-
crease the φ
kHz of bandwidth.
Overall, the LMV821/822/824 family provides good stability
for loaded condition.
FIGURE 1. Phase Margin vs Common Mode Voltage for
m
10012882
20˚(approx.), but at the price of about a 100
Various Loads
S
= +5V, single supply,
10012860
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