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NB7L14MMNGEVB

P1-P3P4-P6P7-P7
© Semiconductor Components Industries, LLC, 2012
February, 2012 − Rev. 2
1 Publication Order Number:
EVBUM2084/D
NB7L14MMNEVB
NB7L14M Evaluation Board
User's Manual
Description
This document describes the NB7L14M evaluation board
and the appropriate lab test setups. It should be used in
conjunction with the NB7L14M data sheet which contains
full technical details on the device specifications and
operation.
The evaluation board is designed to facilitate a quick
evaluation of the NB7L14M GigaCommt clock/data
receiver/driver/translator device. The NB7L14M is
designed to support the distribution of clock/data signals at
high operating frequencies and produces four equal
differential clock/data outputs from a single input
clock/data. The Current Mode Logic (CML) output ensures
minimal noise and fast switching edges.
The evaluation board is implemented in two layers for
higher performance.
Board Lay−up
The board is implemented in two layers and provides a
high bandwidth 50 W controlled impedance environment for
higher performance. The first layer or primary trace layer is
5 mils thick Rogers RO6002 material, which is engineered
to have equal electrical length on all signal traces from the
NB7L14M device to the sense output. The second layer is
32 mils thick copper ground plane.
What measurements can you expect to make?
With this evaluation board, the following measurements
could be performed in single−ended or differential modes of
operation:
• Jitter
• Gain/Return Loss
• Eye Pattern Generation
• Frequency Performance
• Output Rise and Fall Time
• V
CMR
(Common Mode Range)
This Evaluation Board User’s Manual Contains:
• Information on NB7L14MMNEVB Evaluation Board
• Appropriate Lab Setup
• Bill of Materials
Figure 1. NB7L14M Evaluation Board
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EVAL BOARD USER’S MANUAL
NB7L14MMNEVB
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2
SETUP FOR TIME DOMAIN MEASUREMENTS
Table 1. BASIC EQUIPMENT
Description Example Equipment (Note 1) Qty.
Power Supply with 2 outputs HP6624A 1
Oscilloscope TDS8000 with 80E01 Sampling Head (Note 2) 1
Differential Signal Generator HP 8133A, Advantest D3186 1
Matched high speed cables with SMA connectors Storm, Semflex 10
Power Supply cables with clips 4
1. Equipment used to generate example measurements within this document.
2. 50 GHz sample module used (for effective rise, fall and jitter performance measurement)
Setup
Step 1: Connect Power
1a: Three power levels must be provided to the board for
V
CC
, V
EE
, and GND via the surface mount clips.
Table 2. POWER SUPPLY CONNECTIONS
3.3 V Setup 2.5 V Setup
V
CC
= 0 V V
CC
= 0 V
GND = 0 V GND = 0 V
V
EE
= −3.3 V V
EE
= −2.5 V
Step 2: Connect Inputs
For Differential Mode
2a: Connect the differential output of the generator to the
differential input of the device (CLK and CLK
).
OUT
Channel 1
Channel 2
OUT
TRIGGER
Channel 3
Channel 4
TRIGGER
Amplitude = 400 mV
Offset = −200 mV
Signal Generator
CLK
CLK
V
CC
= 0 V
V
CC
V
EE
Q2
Q1
Q1
Q2
Digital Oscilloscope
V
EE
= −3.3 V (3.3 V op)
−or−
V
EE
= −2.5 V (2.5 V op)
GND = 0 V
GND
GND = 0 V
GND
Figure 2. NB7L14M Board Setup − Time Domain
(Differential Mode)
NOTE: All differential cable pairs must be matched.
Channel 8
Channel 7
Channel 6
Channel 5
Q3
Q0Q0
Q3
NB7L14MMNEVB
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3
Setup (continued)
Step 3: Setup Input Signals
3a: Set the signal generator amplitude to 400 mV.
NOTE: The signal generator amplitude can vary from
75 mV to 900 mV to produce a 400 mV DUT
output
.
3b: Set the signal generator offset to −200 mV (the center of
a nominal NCML output).
NOTE: The V
CMR
(Voltage Common Mode Range)
allows the signal generator offset to vary as long
as V
TH
is within the V
CMR
range. Refer to the
device data sheet for further information.
3c: Set the generator output for a PRBS data signal, or for a
square wave clock signal with a 50% duty cycle.
Step 4: Connect Output Signals
4a: Connect the outputs of the device (Q0, Q1, …) to the
oscilloscope. The oscilloscope sampling head must have
internal 50 W termination to ground.
NOTE: Where a single output is being used, the
unconnected output for the pair must be
terminated to V
CC
= GND through a 50 W
resistor for best operation. Unused pairs may be
left unconnected. Since V
CC
= GND, a standard
50 W
SMA termination is recommended.
P1-P3P4-P6P7-P7

NB7L14MMNGEVB

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EVAL BOARD NB7L14MMNG
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