AS3412 datasheet(10/84 Pages) AMSCO

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ams Datasheet

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[v1-00] 2016-Apr-06

AS3412 − Detailed Description

Parameter

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

Figure 9:

Line Input Parameter

Line Input Parameter: This table shows the detailed electrical characteristics of the line input.

Microphone Inputs

The AS3412 offers two low noise microphone inputs with full

digital control and a dedicated DC offset cancellation pin for

each microphone input. In total each gain stage offers up to 63

gain steps of 0.5dB resulting in a gain range from 0dB to +31dB.

The microphone gain is stored digitally during production on

an OTP memory. Besides the standard microphone gain register

for left and right channel, the chip features also two additional

microphone gain registers for monitor mode. Thus, in monitor

mode, a completely different gain setting for left and right

microphone can be selected to implement voice filter functions

in order to amplify the speech band for better speech

intelligibility.

Figure 10:

Stereo Microphone Input

Stereo Microphone Input: This diagram shows the internal structure of the stereo microphone preamplifier

including the mute switch as well as the automatic gain control (AGC).

Symbol

Parameter

Condition

Min

Typ

Max

Unit

VLIN

Input Signal Level

0.9*VBAT

VPEAK

RLIN

Input Impedance

kΩ

MUTE

MUTE_MIC_LEFT

MUTE

MUTE_MIC_RIGHT

AGC

MICL

MICR

MICACL

MICACR

QMICL

QMICR

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