LMV822MX/NOPB National Semiconductor, LMV822MX/NOPB Datasheet - Page 11

• Manufacturer Part Number: LMV822MX/NOPB
• Description: IC OP AMP R-R LOW VOLT LP 8-SOIC
• Manufacturer: National Semiconductor

Specifications of LMV822MX/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 2 V/µs
• Gain Bandwidth Product: 5.6MHz
• Current - Input Bias: 100nA
• Voltage - Input Offset: 3500µV
• Current - Supply: 500µA
• Current - Output / Channel: 45mA
• Voltage - Supply, Single/dual (±): 2.5 V ~ 5.5 V, ±1.25 V ~ 2.75 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-SOIC (3.9mm Width)
• Rail/rail I/o Type: Rail to Rail Output
• Number Of Elements: 2
• Unity Gain Bandwidth Product: 5.6MHz
• Common Mode Rejection Ratio: 72dB
• Input Offset Voltage: 3.5@5VmV
• Input Bias Current: 100nA
• Single Supply Voltage (typ): 2.7/5V
• Dual Supply Voltage (typ): Not RequiredV
• Voltage Gain In Db: 105dB
• Power Supply Rejection Ratio: 75dB
• Power Supply Requirement: Single
• Shut Down Feature: No
• Single Supply Voltage (min): 2.5V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: SOIC N
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -
• Lead Free Status / Rohs Status: Compliant
• Other names: LMV822MX; LMV822MXTR

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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