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CLC014AJE Schematic ( PDF Datasheet ) - National Semiconductor

Teilenummer CLC014AJE
Beschreibung Adaptive Cable Equalizer for High-Speed Data Recovery
Hersteller National Semiconductor
Logo National Semiconductor Logo 




Gesamt 18 Seiten
CLC014AJE Datasheet, Funktion
June 1998
CLC014
Adaptive Cable Equalizer for High-Speed Data Recovery
General Description
National’s CLC014 adaptive cable equalizer is a low-cost
monolithic solution for equalizing data transmitted over cable
(or any media with similar dispersive loss characteristics).
The CLC014 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 CLC014 provides superior jitter performance:
180pspp for 270 Mbps data that has passed through 200
meters of Belden 8281 cable. This exceptional perfor-
mance provides wide error margin in digital data links.
The equalizer operates on a single supply with a power con-
sumption 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 oper-
ates 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 carrier detect 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.
Also, the CLC014 is insensitive to the pathological patterns
inherent in the video industry standards.
Features
n Automatic equalization of coaxial and twisted pair cables
n Carrier detection 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 SMPTE 259M serial digital interfaces: NTSC/PAL, 4:2:2
component and wide screen; also 540 Mbps (4:4:4:4)
n Serial digital video 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: 58 mA
n Equalizes up to 300+ meters of Belden 8281 or 120
meters of Cat 5 UTP cable
Typical Application
© 1999 National Semiconductor Corporation DS100056
DS100056-4
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CLC014AJE Datasheet, Funktion
Typical Performance Characteristics (Continued)
Before Equalization:
100m Category 5 UTP at 51.7Mbps
After Equalization:
100m Category 5 UTP at 51.7Mbps
Data Rate: 51.7Mbps
Time (6ns/div)
DS100056-11
Before Equalization:
100m Category 5 UTP at 155Mbps
Data Rate: 51.7Mbps
Time (6ns/div)
DS100056-14
After Equalization:
100m Category 5 UTP at 155Mbps
Data Rate: 155Mbps
Time (2ns/div)
DS100056-12
Before Equalization:
100m Category 5 UTP at 311Mbps
Data Rate: 155Mbps
Time (2ns/div)
DS100056-15
After Equalization:
100m Category 5 UTP at 311Mbps
Data Rate: 311Mbps
Time (1ns/div)
DS100056-13
Data Rate: 311Mbps
Time (1ns/div)
DS100056-16
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CLC014AJE pdf, datenblatt
Layout and Measurement (Continued)
Maintain common return points for components
Use guard traces
The input lines of the CLC014 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 CLC014 Adaptive Equalizer.
EQUALIZATION CURVE
The CLC014 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.
10k 100k 1M 10M 100M 1G
Frequency (Hz)
DS100056-30
FIGURE 10. Maximum Equalization Response
CABLE EMULATION BOXES
Some cable emulation boxes will not mimic cables correctly.
When evaluating the CLC014, it is strongly recommended
that actual cable be used to determine the various perfor-
mance parameters.
Typical Applications
COAXIAL CABLE RECEIVER (Page 1)
The CLC014 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
CLC006 driver. Carrier Detect (CD) is connected to MUTE to
latch outputs DO and DO in the absence of an input signal to
the equalizer.
Refer to the CLC014’s evaluation board layout for additional
suggestions.
National can supply most of the major components required
to design a transmission line repeater. Figure 11 shows a
typical repeater design using the CLC006, CLC014, and the
CLC016. The design functions supported by each chip are:
CLC006: Cable connection chip
Boosts drive for transmission to next repeater or
final destinations
CLC014: Receive serialized digital data from incoming
transmission lines
Equalizes the incoming data
CLC016: Retimes the equalized data (improving jitter)
The CLC016 is a multi-rate data retiming PLL. The circuit
(Figure 11) will work at up to 4 different data rates with no ad-
ditional components or manual tuning.
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