Si3220/25
DUAL PROSLIC® PROGRAMMABLE CMOS SLIC/CODEC
Features
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Performs all BORSCHT functions
Ideal for applications up to 18 kft
Internal balanced ringing to 65 Vrms
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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
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(Si3220)
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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 (18–45 mA)
ꢁ Loop closure and ring trip thresholds
ꢁ Ground key detect threshold
Automatic switching of up to three battery
supplies
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3.3 or 5 V operation
Part Number
Ringing
Method
GR-909 loop diagnostics
Audio diagnostics with loopback
12 kHz/16 kHz pulse metering
(Si3220)
FSK caller ID generation
Lead-free/RoHS-compliant
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Si3220
Si3225
Internal
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External
Ringer
On-hook transmission
Applications
Ordering Information
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Digital loop carriers
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Private Branch Exchange (PBX) systems
Cable telephony
Voice over IP/voice over DSL
ISDN terminal adapters
See “Dual ProSLIC Selection
Guide” on page 109.
Central Office telephony
Pair gain remote terminals
Wireless local loop
Description
U.S. Patent #6,567,521
U.S. Patent #6,812,744
Other patents pending
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 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.
Functional Block Diagram
INT RESET
Si3220/25
Codec A
SLIC A
CS
SCLK
SDO
SDI
2-Wire AC
Impedance
Pulse Metering
SPI
Control
Interface
Linefeed
Control
DAC
TIP
Subscriber Line
Diagnostics
Hybrid Balance
DTMF Decode
Linefeed
Interface
Channel A
RING
Linefeed
Monitor
ADC
Ringing
Generator
& Ring Trip
FSK
Catellexrt ID
DSP
Sense
DTX
DRX
PCM /
GCI
Interface
Codec B
SLIC B
Dual Tone
Generators
Gain Adjust
Linefeed
Control
TIP
DAC
FSYNC
Loop Closure,
& Ground Key
Detection
Linefeed
Interface
Modem Tone
Detection
Channel B
Linefeed
Monitor
ADC
RING
Programmable
Audio Filters
PLL
PCLK
Relay Drivers
Rev. 1.2 2/06
Copyright © 2006 by Silicon Laboratories
Si3220/25