ECV358NNM1R datasheet(6/13 Pages) E-CMOS

Part #	ECV358NNM1R

Description	1MHz, 1.8V, CMOS, Rail-to-Rail Dual Operational Amplifier

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Manufacturer	E-CMOS [E-CMOS Corporation]

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

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6 / 13 page

1MHz, 1.8V, CMOS,

Rail-to-Rail Dual Operational Amplifier

ECV358

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

4A07N-Rev.P001

Page 6 of 13

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 2nd Order Active Low-Pass Filter

ECV358 can be used to form a 2nd 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

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