EC5821NNB2R datasheet(6/11 Pages) E-CMOS

Part #	EC5821NNB2R

Description	10MHz, Low Power, CMOS, Rail-to-Rail Operational Amplifier

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Manufacturer	E-CMOS [E-CMOS Corporation]

Direct Link	http://www.ecmos.com.tw/

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6 / 11 page

10MHz, Low Power, CMOS,

Rail-to-Rail Operational Amplifier

EC5821

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

3K29N-Rev.P001

Page 6 of 11

Figure 8. Low Pass Active Filter

Sallen-Key 2nd Order Active Low-Pass Filter

EC5731 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

Figure 9. Sanllen-Key 2nd Order Active Low-Pass Filter

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