Data Sheet AS2523, AS2524, AS2524B

Revision 1.13

Page 3 of 19

Pin #

Symbol

Function

25

xCS

Chip select input of the serial interface. Internal pull-up resistor ( 100kOhm )

/xMUTE

Mute transmit-, receive- path and activate tone path on AS2524 and AS2524B

26

DI

Data input of the serial interface. Internal pull-up resistor ( 100kOhm )

/xPD

Power down mode for AS2524 and AS2524B (On-hook)

27

CLK

Clock input of the serial interface. Internal pull-up resistor ( 100kOhm )

/HFE

Handsfree mode operation on AS2524 and AS2524B

23

LO

2

FT1

Analog input pin for connecting a capacitor for offset cancellation.

3

TXO

Analog output of the transmit signal

4

TXV

Analog input for the transmit signal in the voice switching path

1

CBN

Analog input pin for connecting a capacitor for background noise monitoring.

20

RECI

Analog input for the handsfree receive path. Should be connected to RO via coupling

capacitor.

21

RECV

Analog input for receive voice switching path.

24

VSSA

Power supply pin for LO output amplifier.

22

VPP

Power supply pin for LO output amplifier.

28

TONEIN Analog input for DTMF-signals.