OPA4316IPW datasheet(21/65 Pages) TI2

21 / 65 page

OUT

2pRC

3 dB

R = R

C = C

Q = Peaking factor

(Butterworth Q = 0.707)

G =

(

2 -

OUT

= 1 +

OUT

1 + sR C

(

((

(

2pR C

3 dB

OPA316, OPA2316, OPA2316S, OPA4316

www.ti.com

SBOS703F – APRIL 2014 – REVISED OCTOBER 2016

Product Folder Links: OPA316 OPA2316 OPA2316S OPA4316

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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

8.1.1 General Configurations

When receiving low-level signals, the device often requires limiting the bandwidth of the incoming signals into the

system. The simplest way to establish this limited bandwidth is to place an RC filter at the noninverting pin of the

amplifier, as Figure 39 shows.

Figure 39. Single-Pole Low-Pass Filter

If even more attenuation is needed, the device requires a multiple-pole filter. The Sallen-Key filter can be used

for this task, as Figure 40 shows. For best results, the amplifier must have a bandwidth that is 8 to 10 times the

filter frequency bandwidth. Failure to follow this guideline can result in phase shift of the amplifier.

Figure 40. Two-Pole, Low-Pass, Sallen-Key Filter

OPA4316IPW Datasheet(PDF) 21 Page - Texas Instruments