LM4766 datasheet(10/14 Pages) NSC

10 / 14 page

Typical Performance Characteristics (Continued)

Application Information

MUTE MODE

The muting function of the LM4766 allows the user to mute

the music going into the amplifier by drawing more than

0.5 mA out of each mute pin on 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 conjunction with a switch. The switch

when opened cuts off the current flow from pin 6 or 11 to

−V

EE, thus placing the LM4766 into mute mode. Refer to the

Mute Attenuation vs Mute Current curves in the Typical Per-

formance Characteristics section for values of attenuation

per current out of pins 6 or 11. The resistance R

M is calcu-

lated by the following equation:

M ≤ (|−VEE| − 2.6V)/Ipin6

where Ipin6 = Ipin11

≥ 0.5 mA.

Both pins 6 and 11 can be tied together so that only one re-

sistor and capacitor are required for the mute function. The

mute resistance must be chosen such that greater than 1 mA

is pulled through the resistor R

M so that each amplifier is fully

Power Supply

Rejection Ratio

DS100928-88

Common-Mode

Rejection Ratio

DS100928-89

Open Loop

Frequency Response

DS100928-90

Supply Current vs

Case Temperature

DS100928-65

Input Bias Current vs

Case Temperature

DS100928-67

Mute Attenuation vs

Mute Current (per Amplifier)

DS100928-85

Mute Attenuation vs

Mute Current (per Amplifier)

DS100928-86

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