LMP8602MASLASHNOPB datasheet(21/42 Pages) TI1

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R2 =

R =

(

) 2

1 Q

K -

Q =

R1R2

C1R2

R1R2

Q =

R1R2

R1C1 + R2C1

(K2

1)R1C1

C2 =

Q =

R1C1 + R2C1 - R1C2

R1R2C1C2

Q =

R1C1 + R2C1 + (1 - K2) * R1C2

R1R2C1C2

LMP8601, LMP8601-Q1

LMP8602, LMP8602-Q1

LMP8603, LMP8603-Q1

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SNOSAR2H – SEPTEMBER 2008 – REVISED APRIL 2016

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

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Feature Description (continued)

and the quality factor of the filter is given by:

(4)

With K2 = 2x, Equation 4 transforms results in:

(5)

For any filter gain K > 1x, the design procedure can be very simple if the two capacitors are chosen to in a

certain ratio.

(6)

Inserting this in Equation 4 for Q results in:

(7)

Which results in:

(8)

In this case, given the predetermined value of R1 = 100 k

Ω (the internal resistor), the quality factor is set solely

by the value of the resistor R2.

R2 can be calculated based on the desired value of Q as the first step of the design procedure with the following

equation:

(9)

For the gain of 2 for the LMP8601 and LMP8601-Q1, the result is:

(10)

For the gain of 5 for the LMP8602 and LMP8602-Q1, the result is:

(11)

For the gain of 10 for the LMP8603 and LMP8603-Q1, the result is:

(12)

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