LT1366(Rev_A) 데이터 시트보기 (PDF) - Linear Technology

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LT1366
(Rev.:Rev_A)

Dual and Quad Precision Rail-to-Rail Input and Output Op Amps

Linear Technology 

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

1/2 LT1366

VOUT

VIN

3+

SIGNAL AMP

1M

5

7

1/2 LT1366

22pF

CANCELLATION AMP

6

1M

1366 F10

Figure 10. Input Bias Current Cancellation

VCC

RP

+

10k

1/2 LT1366

–

RL

1366 F11

Figure 11. Rail-to-Rail Potentiometer Buffer

16

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