LMV324M National Semiconductor, LMV324M Datasheet - Page 17

Operational Amplifier (Op-Amp) IC

LMV324M

Manufacturer Part Number
LMV324M
Description
Operational Amplifier (Op-Amp) IC
Manufacturer
National Semiconductor
Datasheet

Specifications of LMV324M

No. Of Amplifiers
1
Slew Rate
1V/µs
No. Of Pins
14
Amplifier Type
Operational
Mounting Type
Surface Mount
Peak Reflow Compatible (260 C)
No
Leaded Process Compatible
No
Lead Free Status / RoHS Status
Contains lead / RoHS non-compliant

Available stocks

Company
Part Number
Manufacturer
Quantity
Price
Part Number:
LMV324M
Manufacturer:
NS
Quantity:
1
Part Number:
LMV324M
Manufacturer:
NS
Quantity:
2 083
Part Number:
LMV324M
Manufacturer:
NS
Quantity:
14
Part Number:
LMV324M
Manufacturer:
ST
0
Part Number:
LMV324M
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMV324M
Manufacturer:
NS
Quantity:
4 165
Company:
Part Number:
LMV324M
Quantity:
4 337
Part Number:
LMV324M/NOPB
Manufacturer:
IDT
Quantity:
112
Part Number:
LMV324MMX
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMV324MT
Manufacturer:
NSC
Quantity:
55
Part Number:
LMV324MT
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMV324MT
0
Company:
Part Number:
LMV324MT
Quantity:
215
Part Number:
LMV324MT/LMV324Q3MT
Manufacturer:
NS/国半
Quantity:
20 000
Part Number:
LMV324MTD
Manufacturer:
TI/德州仪器
Quantity:
20 000
Part Number:
LMV324MTX
Manufacturer:
NS
Quantity:
1 000
Application Notes
For minimum dc offset, V
inverting and non-inverting inputs should be equal, which
means
From Equation (1) and Equation (8), we obtain
The values of C
As a design example:
Require: A
Start by selecting C
is close to
From Equations (6), (7), (9), (10),
The above resistor values are normalized values with ω
1rad/s and C
frequency and resistances to the real values, two scaling
factors are introduced, frequency scaling factor (k
pedance scaling factor (k
Scaled values:
LP
1
= 2, Q = 1, fc = 1KHz
= C
1
2
and C
= C
1
R
R
C
and C
2
3
1
n
= R
= R
= C
2
= 1F. To scale the normalized cut-off
m
+
are normally close to or equal to
R
R
R
R
).
= V
1
4
2
1
2
3
4
2
. Choose a standard value that
= 1Ω
= 1Ω
= 4Ω
= 4Ω
= 15.9 kΩ
= 63.6 kΩ
= 0.01 µF
, the resistor values at both
(Continued)
f
) and im-
(10)
n
(8)
(9)
=
17
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.
4.4.3 2nd-order High Pass Filter
A 2nd-order high pass filter can be built by simply inter-
changing those frequency selective components (R
C
shown in Figure 14, resistors become capacitors, and ca-
pacitors become resistors. The resulted high pass filter has
the same corner frequency and the same maximum gain as
the previous 2nd-order low pass filter if the same compo-
nents are chosen.
4.4.4 State Variable Filter
A state variable filter requires three op amps. One conve-
nient way to build state variable filters is with a quad op amp,
such as the LMV324 (Figure 15).
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
function which is quadratic in both numerator and
denominator.
1
FIGURE 14. Sallen-Key 2nd-Order Active High-Pass
, C
2
) in the Sallen-Key 2nd-order active low pass filter. As
Filter
www.national.com
10006083
1
, R
2
,

Related parts for LMV324M