OPA4322SAIPW datasheet(22/61 Pages) TI2

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Gain

1 R R C C

1 3

1 R R C C

Output

Input

s C

1 R

1 R R C C

4 nF

1 nF

2.25 k

1.13 k

2.25 k

Output

Input

OPA322, OPA322S

OPA2322, OPA2322S

OPA4322, OPA4322S

SBOS538F – JANUARY 2011 – REVISED DECEMBER 2016

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Product Folder Links: OPA322 OPA322S OPA2322 OPA2322S OPA4322 OPA4322S

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8.2 Typical Application

Figure 39. Second-Order, Low-Pass Filter Schematic

8.2.1 Design Requirements

•

Gain = 1 V/V

•

Low-pass cutoff frequency = 50 kHz

•

–40-db/dec filter response

•

Maintain less than 3-dB gain peaking in the gain versus frequency response

8.2.2 Detailed Design Procedure

The infinite-gain multiple-feedback circuit for a low-pass network function is shown in. Use Equation 2 to

calculate the voltage transfer function.

(2)

This circuit produces a signal inversion. For this circuit, the gain at DC and the lowpass cutoff frequency are

calculated by Equation 3.

(3)

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OPA4322SAIPW Datasheet(PDF) 22 Page - Texas Instruments

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