AS3412 datasheet(13/84 Pages) AMSCO

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ams Datasheet

Page 13

[v1-00] 2016-Apr-06

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AS3412 − Detailed Description

The cut-off frequency for this filter can be calculated with the

following formula:

The simulated frequency response for the microphone

preamplifier with the recommended component values is

shown in Figure 13.

Figure 13:

Simulated Microphone Frequency Response

In application with PCB space limitations it is also possible to

remove the capacitors CAC and connect MICACL and MICACR

pins directly to AGND. In this configuration AC coupling of the

QMICR and QMICL signals is recommended.

Microphone Frequency Response: This

graph shows the frequency response of

the microphone preamplifier with

different gain settings with CAC=10μF,

CMIC=2.2μF and RMICIN=22kΩ.

(EQ3)

fcut off

–

π RMICIN CMIC

⋅⋅

⋅

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

-5

100

10k

f [Hz]

0dB

6dB

12dB

18dB

24dB

30dB

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