+IN

-IN

+

-

Preamplifier

Gain = 10

Output Buffer

Gain = K2

A1

A2

OFFSET

Internal

Resistor

100 k:

OUT

Level

shift

1

5

3

4

7

8

LMP8602, LMP8602Q, LMP8603, LMP8603Q

SNOSB36D – JULY 2009 – REVISED MARCH 2013

www.ti.com

For the LMP8603:

(18)

the LMP8602 with:

(19)

and for the LMP8603 with:

(20)

Figure 45 shows the configuration that can be used to reduce the gain of the LMP8602 and the LMP8603 in

maximum mid-scale offset scaling accuracy of the LMP8602 is ±1% and the maximum mid-scale offset scaling

accuracy of the LMP8603 is ±1.5%. The pair of resistors selected have to match much better than 1% and 1.5%

to prevent a significant error contribution to the offset voltage.

Figure 45. Reduce Gain for Bidirectional Application

Increase Gain

Figure 46 shows the configuration that can be used to increase the gain of the LMP8602/ LMP8602Q/ LMP8603/

LMP8603Q.

(21)

and for the LMP8603:

(22)

with:

(23)

18

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