®
Si3228x Data Short: ProSLIC Single-Chip
Dual FXS Solution
The Si3228x Dual ProSLIC® devices, in a single package, implement two complete for-
eign exchange station (FXS) telephony interfaces. The Si3228x devices operate from a
KEY FEATURES
3.3 V supply and have standard PCM/SPI or 3-wire ISI digital interfaces. A pair of built-in
• Two complete FXS channels in a single 7x7
or 8x8 mm package
dc-dc converter controllers can be used to automatically generate the optimal battery
voltage required for each line-state, optimizing efficiency and minimizing heat genera-
tion. The Si3228x devices are designed to operate with capacitive boost tracking battery
supply for lower power, cost, and footprint vs. other tracking or shared battery supplies
in the industry. Self-testing and metallic loop testing (MLT) is facilitated by the built-in
DSP, monitor ADC, and test load. The devices are available with wideband audio for
better than PSTN voice quality, DTMF detection, and Smart Ringing. Smart Ringing re-
duces the peak current with 2-channel ringing for lower-cost ac-dc adapters. The
Si3228x devices are available in a 7 x 7 mm 48-pin QFN or 8 x 8 mm 56-pin QFN pack-
age.
• Performs all BORSCHT functions
• Ideal for short- or medium-loop applications
• Ultra-low power consumption
• Patented low-power ringing
• Patent-pending Smart Ringing
• Reduces peak current with 2-channel
ringing
• Adaptive ringing
• Simplified configuration and diagnostics
• Supported by ProSLIC API
Applications:
• Audio diagnostics with loopback
• Integrated test load
• VoIP gateways and routers
• xDSL IADs
• Wideband voice support
• On-hook transmission
• Optical Network Terminals/Units (ONT/U)
• Analog Terminal Adapters (ATA)
• Cable eMTA
• Loop or ground start operation
• Smooth polarity reversal
• Programmable interrupts
• Wireless Fixed Terminals (WFT)
• Wireless Local Loop (WLL)
• WiMAX CPE
• Software-programmable parameters:
• Ringing frequency, amplitude, cadence,
and waveshape
• Private Branch Exchange (PBX)
• VoIP MDU gateways
• Two-wire ac impedance
• Transhybrid balance
• DC current loop feed (10–45 mA)
• Loop closure and ring trip thresholds
• Ground key detect threshold
CODEC
ADC
SLIC
Linefeed
Control
DTMF and
DTMF &
Tone Gen
TIP
• Flexible integrated tracking DC-DC
controller supporting patent-pending low-
cost capacitive boost configuration
Tone Gen
ADC
Channel A
RING
Caller ID
3-wire ISI
or
Linefeed
Monitor
DAC
DAC
Host Interface
• DTMF Generation
PCM/SPI
Interface
Ringing
Ringing
• DTMF Detection (Si32281/3/5/7)
Generator
CODEC
SLIC
Linefeed
Control
Generator
DSP
• 3-wire Integrated Serial Interface (ISI) or
PCM interface
TIP
ADC
ADC
Line Diagnostics
Line Diagnostics
Channel B
RING
• A-Law/µ-Law companding, linear PCM
• Pulse metering
Linefeed
Monitor
DAC
DAC
DC-DC Controller
PCLK / PSCLK
PLL
• 3.3 V operation
Si3228x
• Pb-free/RoHS-compliant packaging
Functional Block Diagram
silabs.com | Smart. Connected. Energy-friendly.
This information applies to a product under development. Its characteristics and specifications are subject to change without notice.
Preliminary Rev. 0.5