Description

The Si3232 is a low-voltage CMOS SLIC that offers a low-cost, fully software programmable, dual-channel, analog telephone interface for customer premise (CPE) applications. Internal ringing generation eliminates centralized ringers and ringing relays, and on-chip subscriber loop testing allows remote line card and loop diagnostics with no external test equipment or relays. The Si3232 performs all programmable SLIC functions in compliance with all relevant LSSGR, ITU, and ETSI specifications; all high-voltage functions are performed by the Si3200 linefeed interface IC.

Features

Ideal for customer premise applications

Low standby power consumption: <65 mW per channel

Internal balanced ringing to 65 Vrms

Software programmable parameters:

Ringing frequency, amplitude, cadence, and waveshape

Two-wire ac impedance

DC loop feed (18–45 mA)

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

SPI bus digital interface with programmable interrupts

3.3 V operation

GR-909 loop diagnostics and loopback testing

12 kHz/16 kHz pulse metering

Lead-free/RoHS compatible packages available

Applications

„ Cable telephony

„ Wireless local loop

„ Voice over IP/voice over DSL

„ ISDN terminal adapters