LMV358MM/NOPB National Semiconductor, LMV358MM/NOPB Datasheet - Page 17

• Manufacturer Part Number: LMV358MM/NOPB
• Description: IC OP AMP DUAL LOW V R-R 8-MSOP
• Manufacturer: National Semiconductor

Specifications of LMV358MM/NOPB

• Amplifier Type: General Purpose
• Number Of Circuits: 2
• Output Type: Rail-to-Rail
• Slew Rate: 1 V/µs
• Gain Bandwidth Product: 1MHz
• Current - Input Bias: 15nA
• Voltage - Input Offset: 1700µV
• Current - Supply: 210µA
• Current - Output / Channel: 160mA
• Voltage - Supply, Single/dual (±): 2.7 V ~ 5.5 V
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 8-MSOP, Micro8™, 8-uMAX, 8-uSOP,
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• -3db Bandwidth: -

For minimum DC offset, V
inverting and non-inverting inputs should be equal, which
means
From
The values of C
As a design example:
Require: A
Start by selecting C
close to
From Equations 6, 7, 9, 10,
The above resistor values are normalized values with ω
rad/s and C
frequency and resistances to the real values, two scaling fac-
tors are introduced, frequency scaling factor (k
impedance scaling factor (k
Equation 1
LP
1
= 2, Q = 1, fc = 1 kHz
= C
1
2
and
and C
= C
1
and C
Equation
n
2
= 1F. To scale the normalized cutoff
are normally close to or equal to
+
R
R
R
R
2
m
. Choose a standard value that is
1
2
3
4
= V
= 1Ω
= 1Ω
= 4Ω
= 4Ω
).
8, we obtain
−
, the resistor values at both
f
) and
n
(10)
= 1
(8)
(9)
17
Scaled values:
An adjustment to the scaling may be made in order to have
realistic values for resistors and capacitors. The actual value
used for each component is shown in the circuit.
2nd-Order High Pass Filter
A 2nd-order high pass filter can be built by simply interchang-
ing those frequency selective components (R
the Sallen-Key 2nd-order active low pass filter. As shown in
Figure
come resistors. The resulted high pass filter has the same
corner frequency and the same maximum gain as the previ-
ous 2nd-order low pass filter if the same components are
chosen.
FIGURE 14. Sallen-Key 2nd-Order Active High-Pass Filter
State Variable Filter
A state variable filter requires three op amps. One convenient
way to build state variable filters is with a quad op amp, such
as the LMV324
This circuit can simultaneously represent a low-pass filter,
high-pass filter, and bandpass filter at three different outputs.
The equations for these functions are listed below. It is also
called "Bi-Quad" active filter as it can produce a transfer func-
tion which is quadratic in both numerator and denominator.
14, resistors become capacitors, and capacitors be-
(Figure
R
R
C
2
3
1
15).
= R
= R
= C
1
4
2
= 15.9 kΩ
= 63.6 kΩ
= 0.01 µF
1
, R
www.national.com
2
, C
10006083
1
, C
2
) in