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AS3418

Functional Description

Datasheet

• PUBLIC

DS000507

• v4-00 • 2020-Jan-23

│ 12

Functional Description

This section provides a detailed description of the device related components.

6.1

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 interrupt the music playback and increase speech intelligibility.

Figure 7:

Stereo 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 series capacitor CLIN can support this function. The

implementation is shown in Figure 7. The correct capacitor value for the desired cut-off frequency can

be calculated with the following formula:

Equation 1:

�� =

2 ∗ �� ∗ �� ∗ ��−��

A typical cut-off frequency in an audio application is 20Hz. With an input impedance RLIN of typ. 1k

Ω

and a desired cut off frequency of 20Hz the input capacitor should be bigger than 8µF. Therefore a

typical value of 10µF is recommended.

6.1.1

Parameter

VBAT=1.65V, TA= 25ºC unless otherwise specified.

to left

headphone

amplifier

MUTE

to right

headphone

amplifier

MUTE

Music Left

LINL

Music Right

LINR

RLIN

CLIN

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