LT1568IGN datasheet(13/16 Pages) AD

13 / 16 page

LT1568

1568f

Table 2. Resistor Values in Ohms, Dual 2nd Order Lowpass

Chebyshev,

±0.25dB Passband Ripple, Gain = 1, R11 = R12,

R21 = R22, R31 = R32

fCUTOFF (MHz)

R11, R21

R31

976

Ω

825

Ω

475

Ω

412

Ω

316

Ω

274

Ω

226

Ω

205

Ω

178

Ω

165

Ω

143

Ω

137

Ω

121

Ω

118

Ω

FREQUENCY (MHz)

0.1

–50

–40

–30

–20

–10

110

1568 TA09

–60

–70

–80

–90

Amplitude Response 2nd Order Lowpass Chebyshev,

±0.25dB Passband Ripple, fCUTOFF = 1MHz

Transient Response 2nd Order Lowpass Chebyshev,

±0.25dB Passband Ripple, fCUTOFF = 1MHz

INPUT

500mV/DIV

OUTPUT

200mV/DIV

µs/DIV

1568 TA10

DUAL 2nd ORDER LOWPASS FILTER DESIG S

Table 3. Resistor Values in Ohms, Dual 2nd Order Lowpass

Bessel, Gain = 1

fCUTOFF (MHz)

R11, R21

R31

866

Ω

1180

Ω

422

Ω

590

Ω

280

Ω

383

Ω

210

Ω

287

Ω

165

Ω

232

Ω

137

Ω

191

Ω

115

Ω

162

Ω

Amplitude Response

2nd Order Lowpass Bessel, fCUTOFF = 1MHz

FREQUENCY (MHz)

0.1

–50

–40

–30

–20

–10

110

1568 TA11

–60

–70

–80

–90

Transient Response

2nd Order Lowpass Bessel, fCUTOFF = 1MHz

INPUT

500mV/DIV

OUTPUT

200mV/DIV

µs/DIV

1568 TA12

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