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OPA320AIDBVT Datasheet(PDF) 19 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor. Click here to check the latest version.
Part No. OPA320AIDBVT
Description  Precision, 20MHz, 0.9pA, Low-Noise, RRIO, CMOS Operational Amplifier with Shutdown
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Maker  NSC [National Semiconductor (TI)]
Homepage  http://www.national.com
Logo NSC - National Semiconductor (TI)

OPA320AIDBVT Datasheet(HTML) 19 Page - National Semiconductor (TI)

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V
OUT
V = 1V
IN
RMS
OPA320
150kW
19.5kW
220pF
1.8kW
3.3nF
47pF
V+
V-
C
1nF
1
C
150pF
2
R
549W
3
R
549W
1
R
1.24kW
2
V+
V
OUT
V
IN
V-
OPA320
OPA320, OPA2320
OPA320S, OPA2320S
www.ti.com
SBOS513E – AUGUST 2010 – REVISED JUNE 2013
ACTIVE FILTER
MFB and Sallen-Key, low-pass and high-pass filter
synthesis
is
quickly
accomplished
using
TI’s
The OPA320 is well-suited for active filter applications
FilterPro™ program. This software is available as a
that require a wide bandwidth, fast slew rate, low-
free download at www.ti.com.
noise, single-supply operational amplifier. Figure 45
shows a 500kHz, second-order, low-pass filter using
the
multiple
−feedback
(MFB)
topology.
The
components
have
been
selected
to
provide
a
maximally-flat Butterworth response. Beyond the
cutoff
frequency,
roll-off
is
–40dB/dec.
The
Butterworth
response
is
ideal
for
applications
requiring predictable gain characteristics, such as the
anti-aliasing filter used in front of an ADC.
One point to observe when considering the MFB filter
is that the output is inverted, relative to the input. If
this inversion is not required, or not desired, a
noninverting output can be achieved through one of
these options:
1. adding an inverting amplifier;
Figure 45. Second-Order Butterworth 500kHz
2. adding an additional second-order MFB stage; or
Low-Pass Filter
3. using a noninverting filter topology, such as the
Sallen-Key (shown in Figure 46).
Figure 46. OPA320 Configured as a Three-Pole, 20kHz, Sallen-Key Filter
Copyright © 2010–2013, Texas Instruments Incorporated
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19
Product Folder Links: OPA320 OPA2320 OPA320S OPA2320S


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