Le77D11
PRODUCT DESCRIPTION
Data Sheet
The dual channel Le77D11 VoSLIC device uses reliable, dielectrically isolated, fully complementary bipolar technology to
implement BORSCHT functions for short loop applications. Internal power dissipation is minimized by two independent line
voltage tracking, buck-boost switching regulators. Two power supplies are required: 3.3 V and a positive supply (V
SW
). A TTL-
level clock driven by the Le78D11 VoSLAC device is required for switcher operation. Six programmable states control loop
signaling, transmission, and ringing. The Le77D11 Dual VoSLIC device DC current limit (I
SC
) is programmable from 15 to 45 mA.
The following diagram demonstrates a typical application.
Figure 1. Typical Le77D11 VoSLIC™ Device/Le78D11 VoSLAC™ device
Application in an 8-Port Integrated Access Device in Customer Premises
Din
1
Le77D11
Le78D11
Dout
Le77D11
Le78D11
PCM I/F
DCLK/CS
Le77D11
Le78D11
Din
Le77D11
Le78D11
Dout
Data Interfaces
8
DSP
Network
Processor
Loop/Cable
MODEM
WLL
DSLAM/
HEADEND
Ethernet USB HomePNA
BLOCK DESCRIPTIONS
Figure 2. Le77D11 VoSLIC™ Device Block Diagram
Fault
Detection
Signal
Transmission
A
1
(TIP)
B
1
(RING)
VREG
1
SD
1
ILS
1
CHS
1
F
1
NPRFILT
1
VIN
1
VOUT
1
VHP
1
CFILT
1
LPF
1
IMT
1
RDC
1
C1
1
C2
1
C3
1
2-Wire
Interface
Signal
Conditioning
Control
Logic
Switcher
Controller
VSW
CHCLK
FSET
SD
2
ILS
2
CHS
2
VREG
2
A
2
(TIP)
B
2
(RING)
Switcher
Controller
Control
Logic
Signal
Conditioning
Signal
Transmission
C1
2
C2
2
C3
2
2-Wire
Interface
IMT
2
RDC
2
NPRFILT
2
VIN
2
VOUT
2
VHP
2
CFILT
2
LPF
2
F
2
Fault
Detection
BGND
1
BGND
2
AGND
VCC
VREF
3
Zarlink Semiconductor Inc.
ZARLINK [ ZARLINK SEMICONDUCTOR INC ]
