The Dual ProSLIC
參數(shù)資料
型號(hào)： SI3225PPTX-EVB
廠商： Silicon Laboratories Inc
文件頁(yè)數(shù)： 37/112頁(yè)
文件大?。?/td> 0K
描述： BOARD EVAL W/DISCRETE INTERFACE
設(shè)計(jì)資源： Si3225PPTX-EVB Schematics/Layout
標(biāo)準(zhǔn)包裝： 1
系列： ProSLIC®
主要目的： 接口，模擬前端（AFE）
已用 IC / 零件： Si3225
已供物品： 板，CD
Si3220/25 Si3200/02
30
Rev. 1.3
Not
Recommended
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3. Functional Description
The Dual ProSLIC chipset is a three-chip integrated
solution that provides all SLIC, codec, and DTMF
detection/decoding functions needed for a complete
dual-channel analog telephone interface. Intended for
multiple-channel long-loop (up to 18 kft) applications
requiring high-density line card designs, the Dual
ProSLIC chipset provides high integration and low-
power operation for applications, such as Central Office
(CO) and digital loop carrier (DLC) enclosures. The
Dual ProSLIC chipset is also ideal for short-loop
applications requiring a space-effective solution, such
as terminal adapters, integrated access devices (IADs),
PBX/key systems, and voice-over IP systems. The
chipset meets all relevant Bellcore LSSGR, ITU, and
ETSI standards.
The Si3220/Si3225 ICs perform all battery, overvoltage,
ringing,
supervision,
codec,
hybrid,
and
test
(BORSCHT) functions on-chip in a low-power, small-
footprint solution. DTMF decoding and generation,
phase continuous FSK (caller ID) signaling, and pulse
metering are also integrated. All high-voltage functions
are implemented using the Si3200/2 Linefeed Interface
IC allowing a highly-programmable integrated solution
that offers the lowest total system cost.
The internal linefeed circuitry provides programmable
on-hook voltage and off-hook loop current, reverse
battery operation, loop or ground-start operation, and
on-hook transmission. Loop current and voltage are
continuously
monitored
using
an
integrated
8-bit
monitor A/D converter. The Si3220 provides on-chip
balanced 5 REN ringing with or without a programmable
dc offset, eliminating the need for an external bulk ring
generator and per-channel ringing relay. Both sinusoidal
and trapezoidal ringing waveshapes are available.
Ringing parameters, such as frequency, waveshape,
cadence, and offset, are available in registers to reduce
external controller requirements. The Si3225 supports
external ringing generation with ring relay driver and
external ring trip sensing to address legacy systems
that implement a centralized ringing architecture. All
ringing options are software-programmable over a wide
range of parameters to address a wide variety of
application requirements.
The Si3220/Si3225 ICs also provide a variety of line
monitoring and subscriber loop testing functions. All
versions have the ability to generate specific dc and
audio signals and continuously monitor and store all line
voltage and current parameters. This combination of
signal generation and measurement tools allows remote
line
card and loop
diagnostics
without
requiring
additional test equipment. These diagnostic functions
comply with relevant LSSGR and ITU requirements for
line-fault detection and reporting, and measured values
are stored in registers for later use or further
calculations. The Si3220 and Si3225 also include two
relay drives per channel to support legacy systems
implementing centralized test equipment.
A
complete
audio
transmit
and
receive
path
is
integrated, including DTMF generation and decoding,
tone
generation,
modem/fax
tone
detection,
programmable
ac
impedance
synthesis,
and
programmable transhybrid balance and programmable
gain
attenuation.
These
features
are
software-
programmable providing a single hardware design to
meet international requirements. Digital voice data
transfer occurs over a standard PCM bus, and control
data is transferred using a standard 4-wire serial
peripheral interface (SPI). The Si3220 and Si3225 can
also be configured to support a 4-wire general circuit
interface (GCI). The Si3220 and Si3225 are available in
a 64-lead TQFP, and the Si3200/2 is available in a
thermally-enhanced 16-lead SOIC.
3.1. Dual ProSLIC Architecture
The Dual ProSLIC chipset is comprised of a low-voltage
CMOS device that uses a low-cost integrated linefeed
interface IC to control the high voltages needed for
operating the terminal equipment connected to the
telephone line. Figure 15 presents a simplified diagram
of the linefeed control loop circuit for controlling the TIP
and RING leads. The diagram illustrates a single-ended
model for simplicity, showing either the TIP or the RING
lead.
The Dual ProSLIC chipset produces line voltages and
currents
on
the
TIP/RING
pair
using
register-
programmable settings as well as direct ac and dc
voltage/current sensing from the line. The Si3200/2
LFIC provides a low-cost interface for bridging the low-
voltage CMOS devices to the high-voltage TIP/RING
pair. Sense resistors allow the voltage and current to be
measured on each lead or across T-R using the low-
voltage
circuitry
inside
the
Si3220
and
Si3225
eliminating expensive analog sensing circuitry inside
the high-voltage Si3200/2. In addition, the total power
inside the Si3200/2 is constantly monitored and
controlled
to
provide
optimal
reliability
under
all
operating conditions. The sensing circuitry is calibrated
for environmental and process variations to guarantee
accuracy with standard external resistor tolerances.
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