LM4883 datasheet(2/23 Pages) NSC

2 / 23 page

Typical Application

External Components Description

(Refer to Figure 1)

Components

Functional Description

R1, 4, 5, 6

The inverting input resistance R1, along with R

3, set the closed-loop gain. R1, along with C1,

form a high pass filter with f

c = 1/(2

πR

1C1).

C1, 2, 3, 4

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

1, along with

1, create a highpass filter with fc = 1/(2

πR

1C1). Refer to the section, SELECTING PROPER

EXTERNAL COMPONENTS, for an explanation of determining the value of C

R2, 3, 7, 8

The feedback resistance, along with R

1 sets 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

5, 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 C

5’s value.

200887A1

FIGURE 1. Typical Audio Amplifier Application Circuit

LM4883 数据表(PDF) 2 Page - National Semiconductor (TI)