Datasheet

-
+
LMP201X
+Input
-Input
(0V to 5V Range)
430:
LM9140-2.5
+2.5V
+5V
ADC1203X
+V
REF
GND
-V
REF
V
IN
+5V
1M
C4
0.01
PF
1N4731A
(4.3V)
D1
7
2
6
4
3
Input
-15V
R6
10k
(-0.7V)
-
+
R1
R7, 3.9k
R2
C2
3
2
6
7
4
LMP201X
U1
LM6171
U2
+
-
R5, 1M
(+2.5V)
Output
C5
0.01 PF
+15V
R4
3.9k
R3
20k
D2
1N4148
C3
0.01 PF
+15V
LMP2014MT
SNOSAK6B –DECEMBER 2004–REVISED MARCH 2013 www.ti.com
In terms of the measured output peak-to-peak noise, the following relationship holds between output noise
voltage, e
n
p-p, for different closed-loop gain, A
V
, settings, where −3 dB Bandwidth is BW:
Figure 34.
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 Equation 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 (Application Notes section) for more
details on this.
Figure 35.
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