AS3435 datasheet(11/102 Pages) AMSCO

11 / 102 page

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

AS3415/AS3435 – 11

Detaile d Desc rip t ion

This section provides a detailed description of the device

related components.

Audio Line Input

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

to the fact that the line input gain stage operates as an inverting

amplifier, with access to the negative input pin and the output

pin, the gain can be freely configured. In monitor mode the line

inputs can also be muted in order to interrupt the music

playback and increase speech intelligibility.

Besides setting the gain with a resistor network, it is also

possible to do simple EQ functions for sound enhancement. The

EQ function can also be used to compensate for low frequency

bass losses in ANC headset with a feed-back topology. For

feed-forward headsets it can be used for sound enhancement

to compensate for example a lack of bass because of physical

design constraints of a headset.

Line Input Gain Setting

The line input gain can be configured with two external

resistors, R1 and R2, per channel as shown in Figure 8. The gain

can be calculated with the following formula:

...[dB]

The resistors R1 and R2 should be in the range from 1kΩ to

100k

Ω. If the application requires a gain of +6dB the resistor

value can be calculated as follows:

For this example, a resistor value for R1 was defined as 10kΩ

This +6dB calculation yields a value for R2 of 20kΩ.

Detailed Description

Line

------

log

⋅

Line

------------

⋅

10k

Ω 10

------

⋅

20k

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