AS3435 datasheet(35/102 Pages) AMSCO

35 / 102 page

ams Datasheet, Confidential: 2014-Jun-13 [v1-30]

AS3415/AS3435 – 35

Detaile d Desc rip t ion

Integrated Music Bypass Switch

If the AS3415/35 is switched off the device features a unique

feature which is integrated bypass switches. These switches can

be used in place of a mechanical switch to bypass the ANC

chipset in off mode or if the headset runs out of battery.

Figure 39 shows the basic music playback path of the

AS3415/35 with a full battery. In this mode the line input

amplifier is enabled as well as the headphone amplifier. The

integrated bypass switches are disabled if the device is

powered.

Figure 39:

Bypass Mode Inactive

Bypass Mode Inactive: This block diagram shows the general music playback path of AS3515/35 with the

integrated music bypass switches disabled.

Figure 40 shows the AS3415/35 in off mode with an empty

battery. This is basically the same use case as no battery at all.

In this mode the internal bypass switch becomes active. The

line input amplifier and the headphone amplifier are not

powered because the headset has run out of battery and the

bypass switch is active. Thus the music signal coming from the

3.5mm audio jack is routed through the ANC chipset without

any power source connected to the device.

Integrated Bypass Switch:

The integrated bypass switch works even

without any battery connected to the

device. It helps to reduce BOM costs and

PCB area. Furthermore it facilitates new

industrial designs to ANC solutions.

AS3435 데이터시트(PDF) 35 Page - ams AG