AS3412 datasheet(9/84 Pages) AMSCO

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ams Datasheet

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[v1-00] 2016-Apr-06

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AS3412 − Detailed Description

This section provides a detailed description of the device

related components.

Audio Line Input

The chip features one stereo line input for music playback. In

monitor mode the line inputs can also be muted in order to stop

music playback and increase speech intelligibility.

Figure 8:

Stereo Line Input

Stereo Line Input: This diagram shows the internal structure of the line input.

If there is a high pass function desired in an application, to block

very low frequencies that could harm the speaker, or eliminate

little offset voltages a simple capacitor CLIN could do this

function. The implementation is shown in Figure 8. The correct

capacitor value for the desired cut-off frequency can be

calculated with the following formula:

A typical cut-off frequency in an audio application is 20Hz. With

an input impedance RLIN of typ. 2k and a desired cut off

frequency of 20Hz the input capacitor should be bigger than

4μF. Therefore a typical value of 4.7μF is recommended.

Detailed Description

to left

headphone

amplifier

MUTE

to right

headphone

amplifier

MUTE

Music Left

LINL

Music Right

LINR

RLIN

CLIN

(EQ1)

CLIN

π RLIN fcut off

–

⋅⋅

⋅

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