LM4831 datasheet(7/12 Pages) NSC

7 / 12 page

Pin Descriptions (Continued)

MIC+IN

This pin is the positive input of the

microphone amplifier. The microphone

amplifier is typically configured as an

inverting amplifier, so this pin should

be connected to the BYPASS pin to

properly bias the amplifier. Further,

this pin should be individually

bypassed with a capacitor of

0.01µF–0.1 µF.

MIC−IN

This pin is the inverting input for the

microphone amplifier. Because the

microphone amplifier is typically used

as an inverting amplifier, this pin

should be capacitor coupled to the

input signal.

MIC OUT

This pin is the microphone amplifier

output. If this pin is to be connected to

any chips other than the LM4831, it

should be capacitor coupled to the

load.

BEEP A,

BEEP B,

BEEP C,

BEEP D

These four pins are used to “wake up”

the LM4831 for a specified amount of

time (dictated by the parallel resistor

and capacitor connected to the RC

pin). If the device is in shutdown and

an edge appears at any of the four

BEEP pins, then the device will

power-up, pass the sound, and then

power-down again.

BEEP OUT

This pin outputs the result of an

exclusive-or of the four BEEP inputs.

BEEP OUT connects back to the

Audio Codec as a status pin.

This pin is connected to an external

resistor-capacitor network which sets

the on-time for a beep request.

Typically, a 0.1µF capacitor is

paralleled with a 1–10M

Ω resistor.

Typical Performance Characteristic

Supply Current vs

Supply Voltage

DS100057-31

Power Derating Curve

DS100057-23

THD+N vs Frequency

DS100057-5

THD+N vs Frequency

DS100057-4

THD+N vs Frequency

DS100057-29

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LM4831 数据表(PDF) 7 Page - National Semiconductor (TI)

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