LT1367 Linear Technology Corporation, LT1367 Datasheet - Page 16

• Manufacturer Part Number: LT1367
• Description: Dual And Quad Precision Rail-to-rail Input And Output Op Amps
• Manufacturer: Linear Technology Corporation

LT1366/LT1367
LT1368/LT1369
TYPICAL APPLICATIONS
the 2 op amp loop to create a negative summing junction
at A1’s positive input
center frequency and Q, which are set with the following
equations:
where,
R1 = 1/(
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.
1
21, 1982.
16
James Hahn, “State Variable Filter Trims Predecessor’s Component Count,” Electronics, April
Figure 9. Frequency Response of 4th Order Butterworth Filter
0
2
= 1/(R1 • C1 • R2 • C2)
–60
–80
–20
–40
0
0
100
• Q • C1) and R2 = Q/(
GAIN
1
. The circuit has low sensitivities for
FREQUENCY (Hz)
1k
PHASE
U
0
• C2).
1366 F09
10k
180
144
108
72
36
0
–36
–72
–108
–144
–180
Figure 11. Rail-to-Rail Potentiometer Buffer
V
Figure 10. Input Bias Current Cancellation
IN
10k
R
1M
P
V
CC
2
3
7
22pF
1M
–
+
1/2 LT1366
1/2 LT1366
+
–
1/2 LT1366
10k
V
+
SIGNAL AMP
+
–
5
6
1
CANCELLATION AMP
V
OUT
1366 F11
R
1366 F10
L