AS2540 datasheet(2/18 Pages) AMSCO

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Data Sheet AS2540

austriamicrosystems

Revision 3.1

Page 2 of 18

Pin Description

Pin #

Symbol

Function

RFD

Ring Frequency Discrimination

Schmitt trigger input for ring frequency discrimination. Disabled during off-hook.

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

2STB

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

8CI

Complex Impedance Input

Input pin for the capacitor to program a complex impedance

DPn

Dial Pulse Output

Open drain output pulls low during break periods of pulse dialling and flash

EHS

Electronic Hook Switch

Schmitt Trigger Input to detect an electronic off-hook.

MHS

Manual Hook Switch

Schmitt Trigger Input to detect a manual off-hook.

MODE

DTMF Level Selection

-4/-6dBm

—> DLS open

-6/-8dBm

—> DLS-r1

-8/-10dBm

—> DLS-r2

Line Loss Compensation Select Pin

45mA-75mA

—> LLC open

20mA-50mA

—> LLC-r3

None

—> LLC-r4

Ring

Melody Output

PDM output of the ring melody generator.

VDD

Voltage Drain Drain

Positive Power Supply

VSS

Voltage Source Source

Negative Power Supply

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