EC5822 datasheet(6/12 Pages) E-CMOS

Numer części	EC5822

Szczegółowy opis	10MHz, Low-Power, CMOS, Rail-to-Rail Dual Operational Amplifier

PDF	12 Pages

Scroll/Zoom	100%

Producent	E-CMOS [E-CMOS Corporation]

Strona internetowa	http://www.ecmos.com.tw/

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6 / 12 page

10MHz, Low-Power, CMOS,

Rail-to-Rail Dual Operational Amplifier

EC5822

E-CMOS Corp. (www.ecmos.com.tw)

3K29N-Rev.P001

Page 6 of 12

Low Pass Active Filter

The low pass active filter is shown in Figure 8. The DC gain is defined by

–R2/R1. The filter has a -20dB/

decade roll-off after

its corner frequency ƒ

C=1/(2πR3C1).

Figure 8. Low Pass Active Filter

Sallen-Key 2

nd Order Active Low-Pass Filter

EC5822 can be used to form a 2

nd order Sallen-Key active low-pass filter as shown in Figure 9. The transfer

function from VIN to VOUT is given by

Where the DC gain is defined by ALP=1+R3/R4, and the corner frequency is given by

The pole quality factor is given by

Let R1=R2=R and C1=C2=C, the corner frequency and the pole quality factor can be simplified as below

And Q=2-R3/R4

EC5822 Arkusz danych(PDF) 6 Page - E-CMOS Corporation