AS2523F datasheet(2/19 Pages) AMSCO

2 / 19 page

Data Sheet AS2523, AS2524, AS2524B

austriamicrosystems

Pin description

Pin #

Symbol

Function

Line Current Sense Input

Analog input for sensing the line current

Line Input

Analog input used for power extraction and line current sensing

Receive Input

Analog input for ac-separated receive signal

STB

Side Tone Balance Input

Analog input for side tone cancellation network

Current Shunt Control Output

N-channel open drain output to control the external high power shunt transistor for

synthesizing AC- and DC-impedance, modulation of line voltage and shorting the line during

make periods of pulse dialing

Complex Impedance Input

Analog input pin for the capacitor to program a complex impedance

Supply Source Control Output

N-channel open drain output to control the external high power source transistor for supplying

(Vpp) the loudspeaker amplifier in off-hook loudspeaking/handsfree mode

VSS

Voltage Source Source

Negative Analog Power Supply

VDD

Voltage Drain Drain

Positive Analog Power Supply

AGND

Analog Ground

Special ground for the internal amplifiers

Microphone Input 1

Differential input for the handset microphone (electret)

Microphone Input 2

Differential input for the handset microphone (electret)

Microphone Input 3

Differential input for the handsfree microphone (electret)

Microphone Input 4

Differential input for the handsfree microphone (electret)

Receive Output to Handset

Output for driving a dynamic earpiece with an impedance from 150

Ω to 300Ω

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