LF147JAN_14 datasheet(13/18 Pages) TI1

Part #	LF147JAN

Description	Wide Bandwidth Quad JFET Input Operational Amplifier

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LF147JAN

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SNOSAJ9A – APRIL 2005 – REVISED MARCH 2013

Figure 30. Long Time Integrator with Reset, Hold and Starting Threshold Adjustment

•

VO starts from zero and is equal to the integral of the input voltage with respect to the threshold voltage:

•

Output starts when VIN ≥ VTH

•

Switch S1 permits stopping and holding any output value

•

Switch S2 resets system to zero

Figure 31. Universal State Variable Filter

For circuit shown:

fO=3 kHz, fNOTCH=9.5 kHz

Q=3.4

Passband gain:

Highpass – 0.1

Bandpass – 1

Lowpass – 1

Notch – 10

• fo× Q ≤ 200 kHz

• 10V peak sinusoidal output swing without slew limiting to 200 kHz

• See LM148 data sheet for design equations

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