LM3886 datasheet(12/20 Pages) NSC

12 / 20 page

Typical Performance Characteristics (Continued)

Application Information

GENERAL FEATURES

Mute Function: The muting function of the LM3886 allows

the user to mute the music going into the amplifier by draw-

ing less than 0.5 mA out of pin 8 of the device. This is accom-

plished as shown in the Typical Application Circuit where the

resistor R

M is chosen with reference to your negative supply

voltage and is used in conjuction with a switch. The switch

(when opened) cuts off the current flow from pin 8 to V

−, thus

placing the LM3886 into mute mode. Refer to the Mute At-

tenuation vs Mute Current curves in the Typical Perfor-

mance Characteristics section for values of attenuation per

current out of pin 8. The resistance R

M is calculated by the

following equation:

M (|VEE| − 2.6V)/I8

where I8

≥ 0.5 mA.

Under-Voltage Protection: Upon system power-up the

under-voltage protection circuitry allows the power supplies

and their corresponding caps to come up close to their full

values before turning on the LM3886 such that no DC output

spikes occur. Upon turn-off, the output of the LM3886 is

brought to ground before the power supplies such that no

transients occur at power-down.

IMD 60 Hz, 1:1

DS011833-53

IMD 60 Hz, 7 kHz 1:1

DS011833-54

IMD 60 Hz, 7 kHz, 1:1

DS011833-55

Mute Attenuation vs

Mute Current

DS011833-56

Mute Attenuation vs

Mute Current

DS011833-57

Large Signal Response

DS011833-58

Power Supply

Rejection Ratio

DS011833-59

Common-Mode

Rejection Ratio

DS011833-60

Open Loop

Frequency Response

DS011833-61

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