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Semiconductor Components Industries, LLC, 2012
August, 2012 − Rev. 1
1 Publication Order Number:
EVBUM2097/D
NBSG72AMNEVB
NBSG72A Evaluation Board
User's Manual
Description
This document describes the NBSG72A evaluation board
and the appropriate lab test setups. It should be used in
conjunction with the device data sheet, which includes
specifications and a full description of device operation.
This board is used to evaluate the NBSG72A GigaComm
fully differential 22 crosspoint switch with Output Level
Select (OLS) capabilities. The OLS input of the NBSG72A
is used to program the peak-to-peak output amplitude
between 0 and 800 mV in five discrete steps.
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 NBSG72A device to the sense output. The second
layer is 32 mils thick copper ground plane.
For standard lab setup and test, a split (dual) power supply
is required enabling the 50 W impedance from the scope to
be used as termination of the ECL signals, where V
TT
is the
system ground (V
CC
= 2.0 V, V
TT
=V
CC
− 2.0 V and V
EE
is −0.5 V or −1.3 V, see Setup 1).
What measurements can you expect to make?
The following measurements can be performed in the
single-ended (Note 1) or differential mode of operation:
Frequency Performance
Output Amplitude (V
OH
/V
OL
)
Output Rise and Fall Time
Output Skew
Eye Pattern Generation
Jitter
V
IHCMR
(Input High Common Mode Range)
1. Single-ended measurements can only be made at
V
CC
–V
EE
= 3.3 V using this board set-up.
Figure 1. NBSG72A Evaluation Board
http://onsemi.com
EVAL BOARD USER’S MANUAL
