LMP8602MASLASHNOPB datasheet(23/42 Pages) TI1

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Rr = 100 k: x

100 - Gr

Rr = 100 k: X

50 - Gr

Rr = 100 k: X

20 - Gr

Gr =

Rr + 100 k:

100 Rr

Gr =

Rr + 100 k:

50 Rr

Gr =

Rr + 100 k:

20 Rr

+IN

-IN

Preamplifier

Output Buffer

Gain = K2

Gain = 10

OFFSET

Internal

Resistor

100 k:

OUT

Level

shift

LMP8601, LMP8601-Q1

LMP8602, LMP8602-Q1

LMP8603, LMP8603-Q1

www.ti.com

SNOSAR2H – SEPTEMBER 2008 – REVISED APRIL 2016

Product Folder Links: LMP8601 LMP8601-Q1 LMP8602 LMP8602-Q1 LMP8603 LMP8603-Q1

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Device Functional Modes (continued)

7.4.1.1 Reducing Gain

Figure 54 shows the configuration that can be used to reduce the gain of the LMP8601 and LMP8601-Q1.

NOTE: K2 = 2 for LMP8601, LMP8601-Q1; 5 for LMP8602, LMP8602-Q1; or 10 for LMP8603, LMP8603-Q1.

Figure 54. Reduce Gain

Rr creates a resistive divider together with the internal 100-kΩ resistor such that the reduced gain Gr becomes:

(21)

For the LMP8602 and LMP8602-Q1:

(22)

And for the LMP8603 and LMP8603-Q1:

(23)

Given a desired value of the reduced gain Gr, using this equation, the LMP8601 and LMP8601-Q1 required value

for the Rr is calculated with:

(24)

For the LMP8602 and LMP8602-Q1:

(25)

And for the LMP8603 and LMP8603-Q1:

(26)

7.4.1.2 Increasing Gain

Figure 55 shows the configuration that can be used to increase the gain of the LMP8601 and LMP8601-Q1.

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