CLC012AJE-TR13/NOPB National Semiconductor, CLC012AJE-TR13/NOPB Datasheet - Page 13

• Manufacturer Part Number: CLC012AJE-TR13/NOPB
• Description: IC CABLE EQUALIZER ADAPT 14-SOIC
• Manufacturer: National Semiconductor

Specifications of CLC012AJE-TR13/NOPB

• Applications: Medical
• Voltage - Supply: 4.5 V ~ 5.5 V
• Package / Case: 14-SOIC (3.9mm Width), 14-SOL
• Mounting Type: Surface Mount
• For Use With: SD012EVK - BOARD EVALUATION CLC012DRIVECABLE02EVK - BOARD EVAL SERDES, CLC001, 012
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Interface: -
• Other names: *CLC012AJE-TR13; *CLC012AJE-TR13/NOPB; CLC012AJE-TR13

Typical Applications
DIGITAL VIDEO (SDV) ROUTERS
The CLC012 provides performance that complies with the
ITU-T G.703 standard for serial digital data transmission
over coaxial cable. One common application is in routers,
which provide a switching matrix for connecting source
equipment to destination equipment.
Figure 12 shows a typical configuration for a router, including
equalizers, a crosspoint switch, data retimers, and cable
drivers. The CLC012 is used in its standard configuration in
this application, and automatically equalizes cable lengths
from zero meters to greater than 300 meters at 360 MHz
(see plots in Typical Performance Characteristics sec-
tion). The equalized outputs are connected to the differential
inputs of the crosspoint switch. The CLC016 Data Retimer
receives the data from the crosspoint and performs the clock
and data recovery functions, further reducing jitter. Finally,
the retimed data is driven into the coaxial cable by a CLC005
ITU-T G.703 Cable Driver (with two amplitude-adjustable
outputs).
FIGURE 12. Data Routing Block Diagram
(Continued)
FIGURE 11. Typical Repeater Design
10014532
10014531
13
TWISTED PAIR DRIVER
A low-cost medium for transmitting data is twisted pair. Cat-
egory 5 UTP has an attenuation characteristic similar to
Belden 8281 coaxial cable but scaled in length: 120 meters
of Category 5 UTP is roughly equivalent to 300 meters of
Belden 8281 cable. When properly implemented, the
CLC012 will equalize data rates up to 625 Mbps over Cat-
egory 5 UTP. The maximum data rate depends upon the
cable length. A plot of Maximum Data Rate vs Cable Length
is found in the Typical Performance Characteristics sec-
tion for Belden 8281, and can be scaled as stated above to
estimate maximum cable lengths and data rates for UTP.
Category 5 UTP has a characteristic impedance of approxi-
mately 100Ω. The CLC005 in Figure 13 is used to drive the
twisted pair AC-coupled with a series 0.1 µF capacitor and a
50Ω resistor in each differential output. The CLC012 Adap-
tive Equalizer requires 800 mV
the cable. A voltage divider is necessary to scale the voltage
to the required level at the input of the CLC012. This resistor
network also provides the correct impedance match for
twisted pair.
For Category 5 UTP, the approximate AEC voltage per
length is 3.75 mV/m (see Block Description). The CLC005
provides a trim adjust for fine tuning the output signal with
the resistor R. Refer to the CLC005 datasheet for tuning
directions.
pp
from the transmit side of
www.national.com