LMP2012MM datasheet(12/16 Pages) NSC

Il numero della parte	LMP2012MM

Spiegazioni elettronici	High Precision, Rail-to-Rail Output Operational Amplifier

PDF	16 Pages

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Produttore elettronici	NSC [National Semiconductor (TI)]

Homepage	http://www.national.com

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Application Information (Continued)

TABLE 1. Composite Amplifier Measured Performance

Ω

MHz

(V/µs)

en p-p

(mV

PP)

200

10k

3.3

178

100

10k

2.5

174

100

100k

0.67

3.1

170

500

200

100k

1.75

1.4

250

1000

100

100k

2.2

0.98

400

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

V, settings, where −3 dB

Bandwidth is BW:

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.

20071519

FIGURE 5.

20071520

FIGURE 6.

20071521

FIGURE 7.

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