LT1568CGN データシートの表示（PDF） - Linear Technology

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LT1568CGN

Very Low Noise, High Frequency Active RC, Filter Building Block

Linear Technology 

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DUAL 2nd ORDER LOWPASS FILTER DESIG S

LT1568

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)

1

R11, R21

976Ω

R31

825Ω

2

475Ω

412Ω

3

316Ω

274Ω

4

226Ω

205Ω

5

178Ω

165Ω

6

143Ω

137Ω

7

121Ω

118Ω

Amplitude Response 2nd Order Lowpass Chebyshev,

±0.25dB Passband Ripple, fCUTOFF = 1MHz

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

0.1

1

FREQUENCY (MHz)

10 20

1568 TA09

Transient Response 2nd Order Lowpass Chebyshev,

±0.25dB Passband Ripple, fCUTOFF = 1MHz

INPUT

500mV/DIV

OUTPUT

200mV/DIV

1µs/DIV

1568 TA10

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

Bessel, Gain = 1

fCUTOFF (MHz)

1

R11, R21

866Ω

R31

1180Ω

2

422Ω

590Ω

3

280Ω

383Ω

4

210Ω

287Ω

5

165Ω

232Ω

6

137Ω

191Ω

7

115Ω

162Ω

Amplitude Response

2nd Order Lowpass Bessel, fCUTOFF = 1MHz

10

0

–10

–20

–30

–40

–50

–60

–70

–80

–90

0.1

1

FREQUENCY (MHz)

10 20

1568 TA11

Transient Response

2nd Order Lowpass Bessel, fCUTOFF = 1MHz

INPUT

500mV/DIV

OUTPUT

200mV/DIV

1µs/DIV

1568 TA12

1568f

13

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