AS2504 datasheet(2/12 Pages) AMSCO

2 / 12 page

Preliminary Data Sheet

AS2504

2/12

August 1998

Pin description

Pin #

Symbol

Function

7LS

Line Current Sense Input

Input for sensing the line current

5LI

Line Input

Input used for power extraction and line current sensing

6RI

Receive Input

Input for ac-separated receive signal

STB

Side Tone Balance Input

Input for side tone cancellation network

3CS

Current Shunt Control Output

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

for synthesising AC- and DC-impedance, modulation of line voltage and shorting

the line during make periods of pulse dialling

Complex Impedance Input

Input pin for the capacitor to program a complex impedance

MASK

Input pin to set circuit into power down mode during e.g. LD-dialling. During

MASK=HIGH, CS-pin is internally shorted to ground.

LLC

Line Loss Compensation Select Pin

45mA-75mA

—> VDD

20mA-50mA

—> AGND

None

—> VSS

VDD

Voltage Drain Drain

Positive Power Supply, for external circuitry t.m. 4.0mA@IL=20mA and

4.0mA@IL=20mA

4VSS

Voltage Source Source

Negative Power Supply

AGND

Analogue Ground

Special ground for the internal amplifiers

2M1

Microphone Input 1

Differential input for the microphone (electret)

1M2

Microphone Input 2

Differential input for the microphone (electret)

Microphone Input 3

Differential input for the microphone (electret)

Microphone Input 4

Differential input for the microphone (electret)

ATI1

Auxiliary Transmit Input 1

RI >= 25k

Ω

ATI2

Auxiliary Transmit Input 2

RI >= 100k

Ω

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