LMV1012-15 National Semiconductor Corporation, LMV1012-15 Datasheet - Page 12

• Manufacturer Part Number: LMV1012-15
• Description: LMV2011 - High Precision, Rail-to-rail Output Operational Amplifier, Package: Soic Narrow, Pin Nb=8
• Manufacturer: National Semiconductor Corporation

www.national.com
Application Information
In terms of the measured output peak-to-peak noise, the
following relationship holds between output noise voltage, e
p-p, for different closed-loop gain, A
Bandwidth is BW:
TABLE 1. Composite Amplifier Measured Performance
1000
100
100
500
AV
50
200
100
200
100
R1
1k
Ω
100k
100k
100k
10k
10k
R2
Ω
FIGURE 5.
0.67
1.75
2.2
C2
pF
10
8
MHz
0.98
V
BW
3.3
2.5
3.1
1.4
, settings, where −3dB
(Continued)
(V/µs)
178
174
170
SR
96
64
(mV
en p-p
250
400
37
70
70
PP
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)
FIGURE 7.
n
12
It should be kept in mind that in order to minimize the output
noise voltage for a given closed-loop gain setting, one could
minimize the overall bandwidth. As can be seen from Equa-
tion 1 above, the output noise has a square-root relationship
to the Bandwidth.
In the case of the inverting configuration, it is also possible to
increase the input impedance of the overall amplifier, by
raising the value of R1, without having to increase the feed-
back resistor, R2, to impractical values, by utilizing a "Tee"
network as feedback. See the LMC6442 data sheet (Appli-
cation Notes section) for more details on this.
FIGURE 6.
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