LMC6035IMMSLASHNOPB datasheet(21/44 Pages) TI

Part #	LMC6035IMM/NOPB

Description	LMC603x 2.7V, Low-Power, Single-Supply, CMOS Operational Amplifiers

PDF	44 Pages

Scroll/Zoom	100%

Manufacturer	TI [Texas Instruments]

Direct Link	http://www.ti.com

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21 / 44 page

7.2.3 High-Pass Active Filter

The previous low-pass filter circuit of Figure 7-7 converts to a high-pass active filter per Figure 7-8.

–

**VIN

LMC603x

4.7nF

6.8nF

54.9k

110k

VOUT

(1F)*

(1.414

* Normalized values

(1F)*

0.7071

1V (offset)

Figure 7-8. 2-Pole, 300Hz, Sallen and Key, High-Pass Filter

7.2.3.1 High-Pass Frequency Scaling Procedure

Choose a standard capacitor value and scale the impedances in the circuit according to the desired cutoff

frequency (300Hz) as follows:

C=C1=C2

(8)

Z= 12πfcC= 1

2π×300Hz×6.8nF=78.05kΩ

(9)

R1= Z×R1normalized=78.05kΩ× 10.707=110.4kΩ

(10)

A standard value of 110kΩ is chosen for R1.

R2= Z×R2normalized=78.05kΩ× 11.414=55.2kΩ

(11)

A standard value of 54.9kΩ is chosen for R2.

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LMC6035, LMC6036

SNOS875H – JANUARY 2000 – REVISED DECEMBER 2024

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LMC6035IMM/NOPB Datasheet(PDF) 21 Page - Texas Instruments