LM4873 datasheet(12/25 Pages) NSC

12 / 25 page

Typical Performance Characteristics (Continued)

Channel Separation

Power Supply

Rejection Ratio

10099320

10099321

Open Loop

Frequency Response

Supply Current vs

Supply Voltage

10099322

10099323

External Components Description

(Refer to Figure 1.)

Components

Functional Description

The inverting input resistance, along with R

f, set the closed-loop gain. Ri, along with Ci, form a high pass

filter with f

c = 1/(2

πR

iCi).

The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C

i, along with Ri, create a

highpass filter with f

c = 1/(2

πR

iCi). Refer to the section, SELECTING PROPER EXTERNAL

COMPONENTS, for an explanation of determining the value of C

The feedback resistance, along with R

i, set the closed-loop gain.

The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about

properly placing, and selecting the value of, this capacitor.

The capacitor, C

B, filters the half-supply voltage present on the BYPASS pin. Refer to the SELECTING

PROPER EXTERNAL COMPONENTS section for information concerning proper placement and selecting

B’s value.

LM4873 Datasheet(PDF) 12 Page - National Semiconductor (TI)