CLC014AJE National Semiconductor, CLC014AJE Datasheet - Page 13

• Manufacturer Part Number: CLC014AJE
• Description: 07B4822
• Manufacturer: National Semiconductor

Specifications of CLC014AJE

• Ic Function: Adaptive Cable Equalizer
• Supply Voltage Range: 4.5V To 5.5V
• Operating Temperature Range: -40°C To +85°C
• Digital Ic Case Style: SOIC
• No. Of Pins: 14
• Termination Type: SMD
• Rohs Compliant: No
• Filter Terminals: SMD
• Data Rate Max: 650Mbps
• Lead Free Status / Rohs Status: Not Compliant

Layout and Measurement
To minimize ringing at the CLC014’s inputs, place a 100Ω
resistor in series with the input. This resistor reduces induc-
tance effects.
Several layout techniques can improve high speed perfor-
mance:
The input lines of the CLC014 use a 100Ω series 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
layout 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
pins.
• Keep input, output and AEC traces well separated
• Use balanced input termination’s
• Avoid routing traces close to the CLC014’s input trace
• Maintain common return points for components
• Use guard traces
FIGURE 10. Maximum Equalization Response
10k
100k
Frequency (Hz)
1M
>
0.5V differentially at the AEC
10M
100M
(Continued)
10005630
1G
13
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
CLC014: Receive serialized digital data from incoming
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
additional components or manual tuning.
Boosts drive for transmission to next repeater or
final destinations
transmission lines
Equalizes the incoming data
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