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The AFE contains eight channel analog telephone interfaces. Implemented
schematic is based on Silicon Laboratories chipset. Si3220 is an ideal
solution for such this kind of voice over IP platform. The Dual ProSLIC®
is a series of low-voltage CMOS devices that integrate both SLIC and codec
functionality into a single IC to provide a complete dual-channel analog
telephone interface in accordance with all 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. On-chip subscriber loop
and audio testing allows remote diagnostics and fault detection with no
external test equipment or relays. The Si3220 and Si3225 operate from
a single 3.3 V or 5 V supply and interface to standard PCM/SPI or GCI
bus digital interfaces. The Si3200 linefeed interface IC performs all
high-voltage functions and operates from a 3.3 V or 5 V supply as well
as single or dual battery supplies up to 100 V. The Si3220 and Si3225
are available in a 64-pin thin quad flat package (TQFP), and the Si3200
is available in a thermally-enhanced 16-pin small outline (SOIC) package
- Performs all BORSCHT functions
- Ideal for applications up to 18 kft
- Internal balanced ringing to 65 Vrms (Si3220)
- External bulk ringer support (Si3225)
- Low standby power consumption: <70 mW per channel
- Software-programmable parameters:
- Ringing frequency, amplitude, cadence and wave shape (Si3220)
- Two-wire ac impedance
- Transhybrid balance
- DC current 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
- Modem/fax tone detection
- DTMF generation/decoding
- Dual tone generators
- A-Law/?-Law, linear PCM compounding
- 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 loop back
- 12 kHz/16 kHz pulse metering (Si3220)
- FSK caller ID generation
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