LT1818 datasheet(23/28 Pages) LINER

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LT1806/LT1807

18067fc

TYPICAL APPLICATIONS

Single 3V Supply, 4MHz, 4th Order Butterworth Filter

Beneﬁting from a low voltage supply operation, low

distortion and rail-to-rail output of LT1806/LT1807, a low

distortion ﬁlter that is suitable for antialiasing can be built

as shown in Figure 6.

On a 3V supply, the ﬁlter built with LT1807 has a passband

of 4MHz with 2.5VP-P signal and stopband that is greater

than 70dB to frequency of 100MHz. As an option to minimize

the DC offset voltage at the output, connect a series resistor

of 365Ω and a bypass capacitor at the noninverting inputs

of the ampliﬁers as shown in Figure 6.

Figure 6. Single 3V Supply, 4MHz, 4th Order Butterworth Filter

–

47pF

1/2 LT1807

220pF

665Ω

VIN

VOUT

18067 F06

365Ω

(OPTIONAL)

232Ω

4.7μF

(OPTIONAL)

–

22pF

470pF

562Ω

274Ω

1/2 LT1807

Figure 7. Filter Frequency Response

FREQUENCY (Hz)

10k

100k

10M

100M

18067 F07

–10

–20

–30

–40

–50

–60

–70

–80

–90

VS = 3V, 0V

VIN = 2.5VP-P

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