AM79D2251 datasheet(3/35 Pages) AMD

Nome de Peças	AM79D2251

Descrição Electrónicos	Dual Intelligent Subscriber Line Audio-Processing Circuit (ISLAC)

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Fabricante Electrônico	AMD [Advanced Micro Devices]

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Am79D2251

3

The dual ISLAC

 device, in combination with an ISLIC™ device, implements a two channel

universal telephone line interface. This enables the design of a single, low cost, high performance,

fully software programmable line interface for multiple country applications worldwide. All AC, DC,

and signaling parameters are fully programmable via microprocessor or GCI interfaces. Additionally,

the dual ISLAC device has integrated self-test and line-test capabilities to resolve faults to the line

or line circuit. The integrated test capability is crucial for remote applications where dedicated test

hardware is not cost effective.

DISTINCTIVE CHARACTERISTICS OF THE INTELLIGENT ACCESS™ VOICE CHIPSET

s Performs all battery feed, ringing, signaling,

hybrid and test (BORSCHT) functions

s Two chip solution supports high density, multi-

channel architecture

s Single hardware design meets multiple country

requirements through software programming

of:

— Ringing waveform and frequency

— DC loop-feed characteristics and current-limit

— Loop-supervision detection thresholds

— Off-hook debounce circuit

— Ground-key and ring-trip filters

— Off-hook detect de-bounce interval

— Two-wire AC impedance

— Transhybrid balance

— Transmit and receive gains

— Equalization

— Digital I/O pins

— A-law/µ-law and linear selection

s Supports internal and external battery-backed

ringing

— Self-contained ringing generation and control

— Supports external ringing generator and ring

relay

— Ring relay operation synchronized to zero

crossings of ringing voltage and current

— Integrated ring-trip filter and software enabled

manual or automatic ring-trip mode

s Supports metering generation with envelope

shaping

s Smooth or abrupt polarity reversal

s Adaptive transhybrid balance

— Continuous or adapt and freeze

s Supports both loop-start and ground-start

signaling

s Exceeds LSSGR and CCITT central office

requirements

s Selectable PCM or GCI interface

— Supports most available master clock

frequencies from 512 kHz to 8.192 MHz

s On-hook transmission

s Power/service denial mode

s Line-feed characteristics independent of battery

voltage

s Only 5 V, 3.3 V and battery supplies needed

s Low idle-power per line

s Linear power-feed with intelligent power-

management feature

s Compatible with inexpensive protection

networks; Accommodates low-tolerance fuse

resistors while maintaining longitudinal balance

s Monitors two-wire interface voltages and

currents for subscriber line diagnostics

s Built-in voice-path test modes

s Power-cross, fault, and foreign voltage

detection

s Integrated line-test features

— Leakage

— Line and ringer capacitance

— Loop resistance

s Integrated self-test features

— Echo gain, distortion, and noise

s 0 to 70°C commercial operation

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

available

s Small physical size

s Up to three relay drivers per ISLIC™ device

— Configurable as test load switches

Nº de peça semelhante - AM79D2251

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Analog Power	AM7900N	320Kb / 5P	Dual N-Channel 150-V (D-S) MOSFET
Advanced Micro Devices	AM7905A	1Mb / 33P	Subscriber Line Audio-Processing Circuit(SLAC)Device
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	AM79101	1Mb / 58P	WORLD CHIP FSK AUTODIAL MODEM
	AM79101	1Mb / 40P	WORLD-CHIP FSK Modem

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Descrição semelhante - AM79D2251

Fabricante Electrônico	Nome de Peças	Folha de dados	Descrição Electrónicos
Advanced Micro Devices	AM79C03	723Kb / 48P	Dual Subscriber Line Audio Processing Circuit (DSLAC) Devices
Advanced Micro Devices	AM7905A	1Mb / 33P	Subscriber Line Audio-Processing Circuit(SLAC)Device
List of Unclassifed Man...	AM79Q02	1Mb / 68P	Quad Subscriber Line Audio-Processing Circuit (QSLAC) Devices
Advanced Micro Devices	AM79R251	317Kb / 27P	Intelligent Subscriber Line Interface Circuit (ISLIC)
List of Unclassifed Man...	AM79231	278Kb / 28P	Intelligent Subscriber Line Interface Circuit (ISLIC)
List of Unclassifed Man...	AM79Q4457	661Kb / 44P	Quad Subscriber Line Audio Processing Circuit-Non-Programmable (QSLAC-NP) Devices
Ericsson	PBL38620-2	135Kb / 16P	Subscriber Line Interface Circuit
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Infineon Technologies A...	PBL38620	1Mb / 46P	Subscriber Line Interface Circuit Rev. 2.0, Apr. 2005
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