External Components Description

(Figure 1)

Components

Functional Description

1.

R

i

This is the input resistor for the inverting input that, along with the 62.5k

Ω internal feedback resistor R

the first stage’s closed-loop gain. The overall SE gain is A

Ω /R

is A

Ω /R

cutoff frequency is filter’s cutoff frequency is f

πR

2.

C

i

This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. C

highpass filter. The filter’s cutoff frequency is f

πR

SELECTING EXTERNAL COMPONENTS, for an explanation of determining C

3.

C

C

This is the output coupling capacitor. Refer to the Application Information section, SELECTING EXTERNAL

COMPONENTS, for an explanation of determining C

4.

C

S

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

properly placing, and selecting the value of this capacitor.

5.

C

B

This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application Information

section, SELECTING EXTERNAL COMPONENTS, for information about properly placing, and selecting the

value of this capacitor.

Typical Performance Characteristics

THD+N vs Output Power

V

A

Ω

THD+N vs Output Power

V

A

Ω

200634C4

200634C6

THD+N vs Output Power

V

A

Ω

THD+N vs Output Power

V

A

Ω

200634C8

200634C9

www.national.com

6