AS3502 datasheet(2/29 Pages) AMSCO

2 / 29 page

REV. M

Page 2

September 1998

AS3502

Pinout Diagramme

AV DD

CAP

MIC1+

MIC1-

MIC2-

MIC2+

N.C.

POR

VREF

DV DD

SCL

SDI

SDO

RXD

SPK-

SPK+

AV SS

EP-

EP+

TRO-

TRO+

GNDD

MCLK

SCLK

TXD

TXS

RXS

28 Pin SOIC

A S3502

MIC2-

MIC2+

VREF

DVDD

PO R

EP+

TRO -

TRO +

G NDD

MCLK

64 pin TQ FP

Pin Description

Pin #

Name

Type

Function

AVDD

Analogue Positive Supply Voltage Input

CAP

Filter Capacitor Output

This pin requires to be connected to an external blocking capacitor of app. 47µF

and is internally connected to the potential divider of the analogue ground genera-

tion circuit.

MIC1-

MIC1+

Differential Microphone 1 Inputs

These two pins are differential inputs to the analogue input multiplexer of the gain

programmable microphone amplifier with an input impedance of approx. 60 k

Ω.

MIC2-

MIC2+

Differential Microphone 2 Inputs

These two pins are differential inputs to the analogue input multiplexer of the gain

programmable microphone amplifier with an input impedance of approx. 60 k

Ω.

N.C.

VREF

Microphone Reference Voltage Output

This pin provides a stabilized reference voltage for an electret microphone of

approx. 2V.

DVDD

Digital Positive Supply Voltage Input

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