OPA4322SAIPW datasheet(21/61 Pages) TI2

21 / 61 page

OUT

V = 1V

RMS

OPA322

150kW

19.5kW

220pF

1.8kW

3.3nF

47pF

V+

V-

1 nF

150 pF

549 W

1.24 kW

V+

OUT

V-

OPA322

OPA322, OPA322S

OPA2322, OPA2322S

OPA4322, OPA4322S

www.ti.com

SBOS538F – JANUARY 2011 – REVISED DECEMBER 2016

Product Folder Links: OPA322 OPA322S OPA2322 OPA2322S OPA4322 OPA4322S

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8 Application and Implementation

NOTE

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The OPA322 family offers outstanding DC and AC performance. These devices operate up to a 5.5-V power

supply and offer ultra-low input bias current and 20-MHz bandwidth. These features make the OPA322 family a

robust operational amplifier for both battery-powered and industrial applications.

8.1.1 Active Filter

The OPA322 is well-suited for active filter applications that require a wide bandwidth, fast slew rate, low-noise,

single-supply operational amplifier. Figure 37 shows a 500-kHz, second-order, low-pass filter using the multiple-

feedback (MFB) topology. The components have been selected to provide a maximally-flat Butterworth response.

Beyond the cutoff frequency, roll-off is –40 dB/dec. The Butterworth response is ideal for applications that require

predictable gain characteristics, such as the anti-aliasing filter used in front of an ADC.

One point to observe when considering the MFB filter is that the output is inverted, relative to the input. If this

inversion is not required, or not desired, a noninverting output can be achieved through one of these options:

1. adding an inverting amplifier;

2. adding an additional second-order MFB stage; or

3. using a noninverting filter topology, such as the Sallen-Key (shown in Figure 38).

MFB, Sallen-Key, low-pass, and high-pass filter synthesis is quickly accomplished using TI’s FilterPro™ program.

This software is available as a free download at www.ti.com.

Figure 37. Second-Order, Butterworth, 500-kHz Low-Pass Filter

Figure 38. OPA322 Configured as a Three-Pole, 20-kHz, Sallen-Key Filter

OPA4322SAIPW Datasheet(PDF) 21 Page - Texas Instruments

OPA4322SAIPW Datasheet(HTML) 21 Page - Texas Instruments

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