LT1568 View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1568' PDF : 16 Pages View PDF
U
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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