CLC014AJE National Semiconductor, CLC014AJE Datasheet - Page 11

• 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
The printed circuit board layout for the CLC014 requires prop-
er high-speed layout to achieve the performance specifica-
tions found in the datasheet. The following list contains a few
rules to follow:
1.
2.
3.
4.
5.
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 CLC014 Adaptive Cable Equalizer. The CLC014 contains
CMOS devices and operators should use grounding straps
when handling the parts.
Figure 9
Bypass V
•
•
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 signal
swings placed as close as convenient to the CLC014
Use a ground plane.
Decouple power pins with 0.1 μF capacitors placed
≤
Design transmission strip lines from the CLC014's input
and output pins to the board connectors.
Route outputs away from inputs.
Keep ground plane
input and output pads.
0.1” (3mm) from the power pins.
shows the CLC014's internal power supply routing.
CC
(pin 4) by:
≥
0.025” (0.06mm) away from the
100056 Version 11 Revision 6
FIGURE 8. Typical Measurement Block
11
Print Date/Time: 2010/08/23 16:48:25
Figure 8
Figure 15
pattern generator with low output jitter was used to provide a
NRZI pattern to create the eye diagrams shown in the Typical
Performance Characteristics section.
Since most pattern generators have a 50Ω output impedance,
a translation can be accomplished using a CLC006 Cable
Driver as an impedance transformer. A wide bandwidth os-
cilloscope is needed to observe the high data rate eye pattern.
When monitoring a single output that is terminated at both the
equalizer output and the oscilloscope, the effective output
load is 37.5Ω. Consequently, the signal swing is half that ob-
served for a single-ended 75Ω termination.
FIGURE 9. Power Package Routing Fixture
shows a block level measurement diagram, while
on depicts a detailed schematic. A pseudo-random
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