描述 Description

The Dual ProSLIC? is a series of low-voltage CMOS devices thatintegrate both SLIC and codec functionality into a single IC to provide a complete dual-channel analog telephone interface in accordance withall relevant LSSGR, ITU, and ETSI specifications. The Si3220 includes internal ringing generation to eliminate centralized ringers and ringing relays, and the Si3225 supports centralized ringing for long loop and legacy applications.

特性 Features

Performs all BORSCHT functions

Ideal for applications up to 18 kft

Internal balanced and unbalanced ringing(Si3220)

External bulk ringer support (Si3225)

Software-programmable parameters:

Ringing frequency, amplitude, cadence, and waveshape (Si3220)

Two-wire ac impedance

Transhybrid balance

DC current loop feed

Loop closure and ring trip thresholds

Ground key detect threshold

Automatic switching of up to three battery supplies

On-hook transmission

Loop or ground start operation with smooth/abrupt polarity reversal

Modem/fax tone detection

DTMF generation/decoding

Dual tone generators

A-Law/μ-Law, linear PCM companding

PCM and SPI bus digital interfaces with programmable interrupts

GCI mode support

3.3 or 5 V operation

GR-909 loop diagnostics

Audio diagnostics with loopback

12 kHz/16 kHz pulse metering(Si3220)

FSK caller ID generation

Lead-free/RoHS-compliant

Applications

Digital loop carriers

Central Office telephony

Pair gain remote terminals

Wireless local loop

Private Branch Exchange (PBX) systems

Cable telephony

Voice over IP/voice over DSL

ISDN terminal adapters