LT1369CS View Datasheet(PDF) - Linear Technology
Part Name
Description
MFG CO.
'LT1369CS' PDF : 20 Pages View PDF
LT1366/LT1367
LT1368/LT1369
TYPICAL APPLICATIONS
the 2 op amp loop to create a negative summing junction
at A1’s positive input1. The circuit has low sensitivities for
center frequency and Q, which are set with the following
equations:
ω02 = 1/(R1 • C1 • R2 • C2)
where:
R1 = 1/(ω0 • Q • C1) and R2 = Q/(ω0 • C2).
The DC bias applied to A2 and A4, half supply, is not needed
when split supplies are available. The circuit swings rail-
to-rail in the passband making it an excellent anti-aliasing
filter for ADCs. The amplitude response is flat to 1kHz then
rolls off at 80dB/decade.
1James Hahn, “State Variable Filter Trims Predecessor’s Component Count,” Electronics, April
21, 1982.
0
–20
–40
–60
–80
100
GAIN
180
144
PHASE
108
72
36
0
–36
–72
–108
1k
FREQUENCY (Hz)
–144
–180
10k
1366 F09
Figure 9. Frequency Response of 4th Order Butterworth Filter
10k
V+
2–
1/2 LT1366
1
VOUT
VIN
3+
SIGNAL AMP
1M
5
7
1/2 LT1366
CANCELLATION AMP
6
22pF
1366 F10
1M
Figure 10. Input Bias Current Cancellation
VCC
RP
10k
+
1/2 LT1366
–
RL
1366 F11
Figure 11. Rail-to-Rail Potentiometer Buffer
1366fb
16
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