AS3435 datasheet(14/102 Pages) AMSCO

14 / 102 page

AS3415/AS3435 – 14

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

De tail ed De sc rip t ion

Bass Boost EQ Function

Some applications may require low frequency compensation.

This function can either help to compensate low frequency

loses due to an ANC feedback circuit or just to help compensate

for a lack of low frequency presence in a headset. In order to

amplify low frequencies there are three parameters that can be

selected by the design engineer. These are shown in Figure 11

below.

Figure 11:

Bass Boost Definition

Bass Boost Definition: This figure shows the typical shape of a bass boost transfer function with the key

parameters for the definition of it.

The first parameter is the desired gain level at the lower

frequencies. This parameter is called AL and defines the gain

below the defined cut-off frequency. The second parameter is

AH. This defines the gain at the higher frequencies. The boost

frequency, fB, defines the attenuation at which the low

frequency starts to roll off. The design engineer can define the

desired attenuation level at the boost frequency. Depending on

the overall gain distribution of the system the boost frequency

is not the same as the cut off frequency with 3dB attenuation.

The application circuit of the bass boost function is shown in

Figure 12 below.

Complex EQ Filtering:

It is also possible to do even more

complex EQ filtering than is shown in the

example with the integrated EQ amplifier.

For details please contact our local

support team.

AS3435 データシート(PDF) 14 Page - ams AG