LM4880

CMOS IC

UNISONICTECHNOLOGIESCO.,LTD

4 of 11

www.unisonic.com.tw

QW-R502-033,B

TYPICAL APPLICATION

+

+

1

7

OUT A

OUT B

Shutdown

Bypass

IN B

6

3

5

2

+

+

-

+

-

Bias

+

IN A

GND

+

4

8

20k

Audio

Input

Audio

Input

20kΩ

50kΩ

0.1μF

20kΩ

+

8Ω or

Ω

32

50kΩ

32

Ω

1.0 F

μ

20kΩ

8Ω or

Ω

Figure 1.Typical Audio Amplifier Application Circuit

15kΩ

15kΩ

COMPONENTS

FUNCTIONAL DESCRIPTION

1.

Ri

Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor

also forms a high pass filter with Ci at fc = 1/(2πRiCi).

2.

Ci

Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also

creates a high pass filter with Ri at fc = 1/(2πRiCi).

3.

RF

Feedback resistance which sets closed-loop gain in conjunction with Ri.

4.

Cs

Supply bypass capacitor which provides power supply filtering.

5.

Bypass pin capacitor which provides half-supply filtering.

6.

Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high