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.

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