NB7L11MMNEVB
Evaluation Board Manual
for NB7L11M
http://onsemi.com
Description
This document describes the NB7L11M evaluation board
and the appropriate lab test setups (See Figure 1). It should
be used in conjunction with the NB7L11M 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 NB7L11M GigaCommt Clock Driver.
The NB7L11M 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
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 Manual Contains:
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
NB7L11M device to the sense output. The second layer is
32 mils thick copper ground plane.
•
Information on NB7L11MMNEVB Evaluation Board
•
Appropriate Lab Setup
•
Bill of Materials
Figure 1. NB7L11M Evaluation Board
©
Semiconductor Components Industries, LLC, 2006
1
April, 2006 − Rev. 1
Publication Order Number:
NB7L11MMNEVB/D
NB7L11MMNEVB
Setup for Time Domain Measurements
Table 1. Basic Equipment
Description
Power Supply with 2 outputs
Oscilloscope
Differential Signal Generator
Matched high speed cables with SMA connectors
Power Supply cables with clips
1. Equipment used to generate example measurements within this document.
HP6624A
TDS8200 or TDS8000
HP 8133A, Advantest D3186
Storm, Semflex
Example Equipment
(Note 1)
Qty.
1
1
1
6
6
Setup
Connect Power
Step 1:
1a: Two power levels must be provided to the board for V
CC
, V
EE
, and GND via the surface
mount clips.
Power Supply Connections
3.3 V Setup
V
CC
= 0 V
GND = 0 V
V
EE
= −3.3 V
V
CC
= 0 V
GND = 0 V
V
EE
= −2.5 V
2.5 V Setup
Connect Inputs
Step 2:
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).
Channel 1
Channel 2
Digital Oscilloscope
V
CC
= 0 V
Signal Generator
CLK
OUT
V
CC
Q1
GND = 0 V
GND
Q1
Channel 3
Channel 4
OUT
Amplitude = 400 mV
Offset = −200 mV
TRIGGER
Q0
CLK
V
EE
Q0
GND
V
EE
= −3.3 V (3.3 V op) −or−
V
EE
= −2.5 V (2.5 V op)
NOTE:
All differential cable pairs
must be
matched.
GND = 0 V
TRIGGER
Figure 2. NB7L11M Board Setup − Time Domain
(Differential Mode)
http://onsemi.com
2
NB7L11MMNEVB
Setup (continued)
Setup Input Signals
Step 3:
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.
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.
3b: Set the signal generator offset to −200 mV (the center of a nominal NCML output).
NOTE:
3c: Set the generator output for a PRBS data signal, or for a square wave clock signal with
a 50% duty cycle.
Connect Output Signals
Step 4:
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.
http://onsemi.com
3
NB7L11MMNEVB
More Information About Evaluation Board
Design Considerations for >10 GHz operation
While the NB7L11M 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 ohms)
•
Distributed effects while bypassing and noise filtering
SURFACE MOUNT CLIP
V
CC
T3
l/2
@ 10 GHz
OPEN CIRCUIT STUB
T6
l/4
@ 10 GHz
T5
C1
0
Q1
Q1
ROSENBERGER SMA
ROSENBERGER SMA
1
1
CLK
T1
CLK
T1
VTCLK
0
l/2
@ 10 GHz
C1
0
NB7L11M
Q0
Q0
T2
T2
1
1
ROSENBERGER SMA
ROSENBERGER SMA
T2
T2
1
1
ROSENBERGER SMA
ROSENBERGER SMA
VTCLK
T5
T6
l/4
@ 10 GHz
T4
OPEN CIRCUIT STUB
V
EE
SURFACE MOUNT CLIP
NOTE:
C1 = Decoupling cap and Tx = 50
W
Transmission line
Figure 3. Evaluation Board Schematic
http://onsemi.com
4
NB7L11MMNEVB
Table 2. Parts List
Part No
NB7L11MMN
32K243−40ME3
CO6BLBB2X5UX
5016
Qty
1
6
6
7
Description
2.5 V / 3.3 V Differential 1:2 Clock/Data Fanout Buffer/
Translator with CML outputs and Internal Termination
Gold plated connector
2 MHz – 30 GHz capacitor
Test point − Anvll
Manufacturer
ON Semiconductor
Rosenberger
Dielectric Laboratories
Keystone*
WEB address
http://www.onsemi.com/
NB7L11M
http://www.rosenberger.de
http://www.dilabs.com
http://www.newark.com
http://www.digikey.com
*Components are available through distribution.
Table 3. Board Material
Material
Rogers 6002
Copper Plating
Thickness
5.0 mil
32 mil
PIN 1
12.5 mil
1.37 mil
Dielectric (5.0 mil)
Thick Copper Base
Figure 4. Board Stack−up
Figure 5. Layout Mask for NB7L11M
http://onsemi.com
5
京公网安备 11010802033920号
Copyright © 2005-2026 EEWORLD.com.cn, Inc. All rights reserved
电子工程世界
