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NB7L32MMNEVB

P1-P3P4-P6
© Semiconductor Components Industries, LLC, 2012
March, 2012 − Rev. 1
1 Publication Order Number:
EVBUM2086/D
NB7L32MMNEVB
NB7L32M Evaluation Board
User's Manual
Description
This document describes the NB7L32M evaluation board
and the appropriate lab test setups (See Figure 1). It should
be used in conjunction with the NB7L32M data sheet which
contains full technical details on the device specification and
operation.
The evaluation board is designed to facilitate a quick
evaluation of the NB7L32M GigaCommt Clock Driver.
The NB7L32M is designed to support the distribution of
clock/data signals at high operating frequencies and
produces two 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
NB7L32M 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
• Output Skew
• 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 NB7L32MMNEVB Evaluation Board
• Appropriate Lab Setup
• Bill of Materials
Figure 1. NB7L32M Evaluation Board
http://onsemi.com
EVAL BOARD USER’S MANUAL
NB7L32MMNEVB
http://onsemi.com
2
SETUP FOR TIME DOMAIN MEASUREMENTS
Table 1. BASIC EQUIPMENT
Description Example Equipment (Note 1) Qty.
Power Supply with 2 outputs HP6624A 1
Oscilloscope TDS8200 or TDS8000 1
Differential Signal Generator HP 8133A, Advantest D3186 1
Matched high speed cables with SMA connectors Storm, Semflex 4
Power Supply cables with clips 5
1. Equipment used to generate example measurements within this document.
Setup
Step 1: Connect Power
1a: Two 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 (3.3 V and 2.5 V operation)
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
TRIGGER
Amplitude = 500 mV
Offset = −250 mV
Signal Generator
CLK
CLK
V
CC
= 0 V
V
CC
V
EE
Q
C1
Q
Digital Oscilloscope
V
EE
= −3.3 V (3.3 V op)
V
EE
= −2.5 V (2.5 V op)
R
GND
V
CC
= 0 V
Figure 2. NB7L32M Board Setup − Time Domain
(Differential Mode)
NOTE: All differential cable pairs must be matched.
All V
CC
pins have to be connected for proper device operation.
V
TT
= 0 V
C1
NB7L32MMNEVB
http://onsemi.com
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
(Input 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.
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
through a 50 W resistor for
best operation. Unused pairs may be left
unconnected.
MORE INFORMATION ABOUT EVALUATION BOARD
Design Considerations for >10 GHz operation
While the NB7L32M is specified to operate at 10 GHz,
this evaluation board is designed to support operating
frequencies up to 20 GHz.
The following considerations played a key role to ensure
this evaluation board achieves high−end microwave
performance:
• Optimal SMA connector launch
• Minimal insertion loss and signal dispersion
• Accurate Transmission line matching (50 W)
• Distributed effects while bypassing and noise filtering
P1-P3P4-P6

NB7L32MMNEVB

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Manufacturer:
ON Semiconductor
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BOARD EVAL FOR NB7L32MM
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