-

+

LMP201X

+Input

-Input

(0V to 5V Range)

430:

LM9140-2.5

+2.5V

+5V

ADC1203X

+VREF

GND

-VREF

VIN

+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, en p-p, for different closed-loop gain, AV, 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.

14

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