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PDF CLC012AJE Data sheet ( Hoja de datos )

Número de pieza CLC012AJE
Descripción Adaptive Cable Equalizer for ITU-T G.703 Data Recovery
Fabricantes National Semiconductor 
Logotipo National Semiconductor Logotipo



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No Preview Available ! CLC012AJE Hoja de datos, Descripción, Manual

August 1998
CLC012
Adaptive Cable Equalizer for ITU-T G.703 Data Recovery
General Description
National’s CLC012 adaptive cable equalizer is a low-cost
monolithic solution for equalizing data transmitted over cable
(or any media with similar dispersive loss characteristics).
The CLC012 simplifies the task of high-speed data recovery
with a one-chip solution and a minimal number of external
components. The equalizer automatically adapts to equalize
any cable length from zero meters to lengths that attenuate
the signal by 40 dB at 200 MHz. This corresponds to 300
meters of Belden 8281 or 120 meters of Category 5 UTP
(unshielded twisted pair).
The CLC012 provides superior jitter performance: 180pspp
for 270 Mbps data that has passed through 200 meters of
Belden 8281 cable. This exceptional performance provides
wide error margin in digital data links. The equalizer operates
on a single supply with a power consumption of only 290
mW. The small 14-pin SOIC package allows for high-density
placement of components for multi-channel applications
such as routers. The equalizer operates over a wide range of
data rates from less than 50 Mbps to rates in excess of 650
Mbps.
The equalizer is flexible in allowing either single-ended or
differential input drive. Its high common mode rejection pro-
vides excellent immunity to interference from noise sources.
On-chip quantized feedback eliminates baseline wander.
Additional features include a Loss of Signal output and an
output mute pin which, when tied together, mute the output
when no signal is present. A buffered eye monitor output is
provided, for viewing the equalized signal prior to the com-
parator. Differential AEC pins allow the user to set the inter-
nal adaptive loop time constant with one external capacitor.
Features
n Automatic equalization of coaxial and twisted pair cables
n Loss of Signal detect and output mute
n Output eye monitor
n Single supply operation: +5V or −5.2V
n Single-ended or differential input
n Low cost
Applications
n ITU-T G.703 serial data recovery
n Serial digital data routing and distribution
n Serial digital data equalization and reception
n Data recovery equalization: ATM, CAD networks,
medical, set top terminals, industrial video networks
Key Specifications
n Low jitter: 180pspp @ 270 Mbps through 200 meters of
Belden 8281 coaxial cable
n High data rates: < 50 Mbps to > 650 Mbps
n Excellent input return loss: 19 dB @ 270 MHz
n Low supply current: 68 mA
n Equalizes up to 300+ meters of Belden 8281 or 120
meters of Cat 5 UTP cable
Typical Application
© 1998 National Semiconductor Corporation DS100145
DS100145-4
www.national.com

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CLC012AJE pdf
Typical Performance Characteristics
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CLC012AJE arduino
Layout and Measurement (Continued)
DS100145-28
FIGURE 8. Typical Measurement Block
Troubleshooting with scope probes can affect the equaliza-
tion. For high data rates, use a low capacitance probe with
less than 2 pF probe capacitance. Evaluation boards and lit-
erature are available for quick prototyping and evaluation of
the CLC012 Adaptive Cable Equalizer. The CLC012 con-
tains CMOS devices and operators should use grounding
straps when handling the parts.
Figure 9 shows the CLC012’s internal power supply routing.
Bypass VCC (pin 4) by:
Monolithic capacitor of about 0.1 µF placed less than 0.1”
(3mm) from the pin
Tantalum capacitor of about 6.8 µF for large current sig-
nal swings placed as close as convenient to the CLC012
The input lines of the CLC012 use a 100series resistors at
the input pins. This decreases the inductive effects internal
to the part to reduce ringing on fast rise and fall times. Refer
to the evaluation board layout for further suggestions on lay-
out for the CLC012 Adaptive Equalizer.
EQUALIZATION CURVE
The CLC012 Adaptive Cable Equalizer has a maximum
equalization response as shown in Figure 10. This response
may be obtained by forcing >0.5V differentially at the AEC
pins.
DS100145-30
FIGURE 10. Maximum Equalization Response
DS100145-29
FIGURE 9. Power Package Routing Fixture
To minimize ringing at the CLC012’s inputs, place a 100re-
sistor in series with the input. This resistor reduces induc-
tance effects.
Several layout techniques can improve high speed perfor-
mance:
Keep input, output and AEC traces well separated
Use balanced input termination’s
Avoid routing traces close to the CLC012’s input trace
Maintain common return points for components
Use guard traces
CABLE EMULATION BOXES
Some cable emulation boxes will not mimic cables correctly.
When evaluating the CLC012, it is strongly recommended
that actual cable be used to determine the various perfor-
mance parameters.
Typical Applications
COAXIAL CABLE RECEIVER (Page 1)
The CLC012 equalizer application shown on page 1 will
equalize a variety of coaxial cables up to lengths that attenu-
ate the signal by 40 dB at 200 MHz. The application shows
the proper connection for a single cable driven with a
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