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LE77D112 PRODUCT PROFILE - 34456 Le77D11

Voice Over Subscriber Line Interface Circuit

A Voice Solution

VE770 Series

APPLICATIONS ORDERING INFORMATION

An Le78D11 VoSLAC™ device must be used with this part. *Green package meets RoHS Directive 2002/95/EC of the European Council to minimize the environmental impact of electrical equipment. Short/Medium Loop: approximately 2000 ft. of 26 AWG, and 5 REN loads
DevicePackage Voice over IP/DSL – Integrated Access Devices, Smart Residential Gateways, Home Gateway/Router
Le77D112TC44-pin eTQFPLe77D112BTC44-pin eTQFP (Green package)* Cable Telephony – NIU, Set-Top Box, Home Side Box, Cable Modem, Cable PC Fiber–Fiber In The Loop (FITL), Fiber to the Home (FTTH)

DESCRIPTION

Wireless Local Loop, Intelligent PBX, ISDN NT1/TA The Legerity Le77D11 dual-channel Voice over Subscriber Line Interface Circuit (VoSLIC™) device has enhanced and optimized features to directly address the requirements of voice over broadband applications. Their common goal is to reduce system level costs, space, and power through higher levels of integration, and to reduce the total cost of ownership by offering better quality of service. The Le78D11/Le77D11 is a two-device chip set providing a totally software configurable solution to the BORSCHT functions for two lines. The resulting system is less complex, smaller, and denser, yet cost effective with minimal external components. The Le77D11 Dual VoSLIC device requires only two power supplies: +3.3 VDC

FEATURES

Integrated Dual-Channel Chip set —Built-in boost switching power supply tracks line voltage minimizing power dissipation—Only +3.3 V and +12 V (nominal) required—Wide range of input voltages (+8 V to +40 V) supported—Minimum external discrete components—44-pin eTQFP package and nominally +12 VDC, but can range from +8 to +40 VDC Ringing —5REN—Up to 90 Vpk, Balanced —Sinusoidal or trapezoidal with programmable DC offset depending on the application. A single TTL-level clock source drives the two switching regulators that generate the required line voltage dynamically on a “per line” basis. Six programmable states are available: Low Power Standby, Disconnect, Normal Active, Reverse Polarity, Ringing and Line Test. Binary fault detection is provided upon application of fault conditions or thermal overload. Subscriber Loop Test/Self-Test —GR-909 compliant drop test capability in both measurements and pass/fail–Hazardous Potential–Foreign Electromotive Force –Resistive Faults–Receive Off-hook–Ringers Test–Loop Length

BLOCK DIAGRAM

Switching PowerSupply World Wide Programmability:
2-wireTip+RingInterface g TipRin —Two-wire AC impedance—Dual Current Limit—Metering —Programmable loop closure and ring trip thresholds
2-wire to 4-wireconversion Le78D11Codec Le77D11 SLIC Codec Interface Six SLIC Device States, including: —Low power Standby state—On-hook transmission —Reverse Polarity
2-wire to 4-wireconversion 2-wireTip+RingInterface g TipRin

RELATED LITERATURE

Switching PowerSupply 080697 Le78D11 Data Sheet 080716 Le77D11/Le78D11 Chip Set User’s Guide 081013 Layout Considerations for the Le77D11 and Le9502 Application Note NOTE: On August 3, 2007, Zarlink Semiconductor acquired the products andtechnology of Legerity Holdings.
Document ID# 080696 Date: Sep 19, 2007 Rev: G Version: 2 Distribution :Public Document