AM79D2251VC datasheet(1/35 Pages) AMD

Part #	AM79D2251VC

Description	Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC)

PDF	35 Pages

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Manufacturer	AMD [Advanced Micro Devices]

Direct Link	http://www.amd.com

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1 / 35 page

Pub. # 22829

Rev: C

Amendment: /0

Issue Date: December 1999

Intelligent Access™ Voice Solutions

Am79D2251

Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC

)

DISTINCTIVE CHARACTERISTICS

s High performance digital signal processor

provides programmable control of all major

linecard functions

— 32 and 24 kb/s ADPCM to G726, as well as

A-law/

µ-law and linear codec

— Transmit and receive gain

— Two-wire AC impedance

— Transhybrid balance

— Equalization

— DC loop feeding

— Smooth or abrupt polarity reversal

— Loop supervision

— Off-hook debounce circuit

— Ground-key and ring-trip filters

— Ringing generation and control

— Adaptive hybrid balance

— Line and circuit testing

— Tone generation

— Metering generation at 12 kHz and 16 kHz

— Envelope shaping and level control

s Selectable PCM/MPI or GCI digital interfaces

— Supports most available master clock

frequencies from 512 kHz to 8.196 MHz

s 0 to 70°C commercial operation

—–40°C to 85°C extended temperature range

available

s +3.3 V DC operation

s Exceeds LSSGR and ITU requirements

s Supports external ringing with on-chip ring-trip

circuit

— Automatic or manual ring-trip modes

s DTMF detection according to Q.24

s 2100 Hz modem tone detection according to V.25

BLOCK DIAGRAM

RC

Networks

and

Protection

A1

B1

A2

B2

Dual

ISLAC

ISLIC

LD1

VREF

7

AGND1

AGND2

RREF

BATP

BATH

Ring-Trip

Sense

Resistors

5

BATL

RSHB

RSLB

RSPB

VCCA

4

VCCD

DGND1

DGND2

TSCA/G

DRA/DD

DXA/DU

DCLK/S0

PCLK/FS

MCLK

FS/DCL

CS/RST

DIO/S1

INT

3

P1-P3

7

LD2

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