HC55185(2000) データシートの表示（PDF） - Intersil
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HC55185 Datasheet PDF : 17 Pages
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TM
Data Sheet
HC55185
April 2000 File Number 4831.2
VoIP Ringing SLIC Family
The RSLIC-VoIP family of
ringing subscriber line
interface circuits (RSLIC)
supports analog Plain Old
Telephone Service (POTS) in
short and medium loop length, wireless and wireline
applications. Ideally suited for remote subscriber units, this
family of products offers flexibility to designers with high
ringing voltage and low power consumption system
requirements.
The RSLIC-VoIP family operates to 100V which translates
directly to the amount of ringing voltage supplied to the end
subscriber. With the high operating voltage, subscriber loop
lengths can be extended to 500Ω (i.e., 5,000 feet) and
beyond.
Other key features across the product family include: low
power consumption, ringing using sinusoidal or trapezoidal
waveforms, robust auto-detection mechanisms for when
subscribers go on or off hook, and minimal external discrete
application components. Integrated test access features are
also offered on selected products to support loopback
testing as well as line measurement tests.
There are five product offerings of the HC55185 with each
version providing voltage grades of high battery voltage and
longitudinal balance. The voltage feed amplifier design uses
low fixed loop gains to achieve high analog performance with
low susceptibility to system induced noise.
Features
• Onboard Ringing Generation
• Compatible with Existing HC5518x Devices
• Low Standby Power Consumption (75V, 65mW)
• Reduced Idle Channel Noise
• Programmable Transient Current Limit
• Improved Off Hook Software Interface
• Integrated MTU DC Characteristics
• Low External Component Count
• Silent Polarity Reversal
• Pulse Metering and On Hook Transmission
• Tip Open Ground Start Operation
• Thermal Shutdown with Alarm Indicator
• 28 Lead Surface Mount Packaging
• Dielectric Isolated (DI) High Voltage Design
Applications
• Voice Over Internet Protocol (VoIP)
• Cable Modems
• Voice Over DSL (VoDSL)
• Short Loop Access Platforms
• Remote Subscriber Units
• Terminal Adapters
Related Literature
• AN9814, User’s Guide for Development Board
• AN9824, Modeling of the AC Loop
• Interfacing to DSP CODECs (Contact Factory)
Block Diagram
POL
CDC
VBL VBH
ILIM
DC
CONTROL
BATTERY
SWITCH
RINGING
PORT
VRS
TIP
RING
TL
2-WIRE
PORT
TRANSIENT
CURRENT
LIMIT
TRANSMIT
SENSING
4-WIRE
PORT
VRX
VTX
-IN
VFB
SW+
SW-
TEST
ACCESS
DETECTOR
LOGIC
F2
CONTROL
LOGIC
F1
F0
RTD RD E0 DET ALM
BSEL SWC
4-1
CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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RSLIC18™ is a trademark of Intersil Corporation.
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