OPA725, OPA2725

OPA726, OPA2726

SBOS278B − SEPTEMBER 2003 − REVISED JANUARY 2004

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14

NOTE: FilterPro is a low-pass filter design program available for download at no cost from TI’s web site (www.ti.com). The program can be used

to determine component values for other cutoff frequencies or filter types.

DC Gain = 1

C

1

1nF

C

2

330pF

R

2

15.9k

Ω

R

1

1.93k

Ω

2.2nF

C

3

C

4

100pF

R

4

22.3k

Ω

R

3

2.07k

Ω

Cutoff Frequency = 50kHz

V

OUT

1/2

OPA2725

1/2

OPA2725

Figure 7. Four-Pole Butterworth Sallen-Key Low-Pass Filter