(

Figures 1, 2)

Components

Functional Description

12.

R

M

Mute resistance set up to allow 0.5 mA to be drawn from pin 8 to turn the muting function off.

→ R

Mute Current curves in the Typical Performance Characteristics section.

13.

C

M

Mute capacitance set up to create a large time constant for turn-on and turn-off muting.

14.

R

SN

(Note 15)

Works with C

15.

C

SN

(Note 15)

Works with R

f

16.

L

(Note 15)

Provides high impedance at high frequecies so that R may decouple a highly capacitive load and reduce

the Q of the series resonant circuit due to capacitive load. Also provides a low impedance at low

frequencies to short out R and pass audio signals to the load.

17.

R

(Note 15)

18.

C

S

Provides power supply filtering and bypassing.

19.

S1

Mute switch that mutes the music going into the amplifier when opened.

Note 15: Optional components dependent upon specific design requirements. Refer to the Application Information section for more information.

OPTIONAL EXTERNAL COMPONENT INTERACTION

Although the optional external components have specific desired functions that are designed to reduce the bandwidth and elimi-

nate unwanted high frequency oscillations they may cause certain undesirable effects when they interact. Interaction may occur

for components whose reactances are in close proximity to one another. One example would be the coupling capacitor, C

the compensation capacitor, Cf. These two components act as low impedances to certain frequencies which will couple signals

from the input to the output. Please take careful note of basic amplifier component functionality when designing in these compo-

nents.

The optional external components shown in

Figure 2 and described above are applicable in both single and split voltage supply

configurations.

Typical Performance Characteristics

Safe Area

DS011775-17

SPiKe

Protection Response

DS011775-18

Supply Current vs

Supply Voltage

DS011775-19

www.national.com

7