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CAUTION: These devices are sensitive to electrostatic discharge; follow proper IC Handling Procedures.
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|Copyright Intersil Americas Inc. 2012. All Rights Reserved
Intersil (and design) and SLOC are trademarks owned by Intersil Corporation or one of its subsidiaries.
All other trademarks mentioned are the property of their respective owners.
Security Link Over Coax™ (SLOC™) Receiver
TW3811
SLOC™ (Security Link Over Coax) is a transmission protocol for
simultaneously transmitting analog CVBS video and digital IP
video over a single coaxial cable.
The TW3811 is the receiving end of a SLOC link, converting the
single SLOC signal on the coaxial cable back to separate
Ethernet digital video data and analog CVBS video. It can be
embedded into a DVR to enable one or more SLOC inputs or
configured as a stand-alone SLOC-to-IP+CVBS converter.
The TW3811 includes an AFE, digital modem, and two
Ethernet MII/RMII interfaces. The device accepts a SLOC
output signal from a SLOC transmitter and decodes it into an
analog CVBS signal and an Ethernet MII signal.
Applications
• Single-Channel SLOC receiver modem
• Multi-Channel SLOC receiver modem
•Embedded DVR
Features
• Simultaneous transmission of IP video data and analog
CVBS video over up to 500m of RG59 coaxial cable
• Analog CVBS video preview support
• Proprietary adaptive analog equalizer for extending the
reach of CVBS video
• Proprietary SLOC-based IP camera detection
• Creates a full-duplex 100BASE-T digital link
• 36Mbps downlink speed from TW3801 to TW3811
• 4Mbps uplink for SLOC compliance
• Ethernet MAC MII/RMII interface for interfacing to DVR/NVR
network processor SoC
• Optional Ethernet PHY MII/RMII interface for interfacing to
external Ethernet PHY chip
•I
2
C 2-wire control interface
• Integrated PLL with 25MHz crystal interface
• 1.8V, 3.3V supplies
• 100-TQFP (12x12mm) Package
Application Block Diagram
EL8101
Analog
CVBS
Ethernet
SPOT
Monitor
DVR
Network
Switch
NVR
One-Channel SLOC Receiver
TW3811
100BASE-T
PHY
SLOC Adapter Module
TW3801
Up to 500m of
RG59 cable
IP Camera
Analog
CVBS
Ethernet
100BASE-T
PHY
MCU
(optional)
MCU
(optional)
Simplified Application Schematic
3.3V3.3V 1.8V
+
TW3811
+
COAX_OUT
22µF
0.1µF
470µF
75
COAX_IN
1M
25MHz
22pF22pF
XTAL_OUT
XTAL_IN
10k
10µF
24k
CVBS_OUT
1.5k
10µF
4.7k
3.3V
I
2
C
Microcontroller
SCL
SDA
MII or
RMII
PHY
MII / RMII
Interface
RJ45
Ethernet
I/O
SLOC
Coax I/O
LOAD_DRV
75
V
DD_IO
V
DD_A
V
DD_D
150nH
BAT54
75
+
CVBS
Output
470µF
November 29, 2012
FN8284.1
