
NMUSB2022PMC
2 MOPP Powered Dual Port USB Data Isolator
KDC_NMUSB2022PMC.A03 Page 5 of 8
www.murata-ps.com/support
APPLICATION NOTES
Typical Eye Diagram:
NMUSB2022PMC
Full speed downstream
signal quality test board
Full speed qualifier
attached to test board
Full speed HUB 1
Full speed HUB 2
Full speed HUB 3
HOST PC
Oscilloscope
Full speed HUB 4
Voltage
Time
3.64
3.06
2.48
1.90
1.32
740m
160m
-420m
-83.33n
-66.67n
-50n
-33.33n
-16.67n
0
16.67n
33.33n
50n
66.67n 83.33n
Equipment Use
Tektronix DPO5034B Scope Signal Qualification
Scope Firmware 7.2.0 Build 4
TekExpress USB2 1.0.0.65
Framework version 3.0.1.51
Tektronix TPP0500 500MHZ 300V CATII 3.9pF probes
Thurlby PL320 Power Supply for NMUSB2022PMC
HP Elite Desk 800G F6X32ET~ABU Remote From
HP Compaq DC5800 Remote Into
Keithley 2000 DMM Vin Measurement
Keithley 2000 DMM Iin Measurement
Pro Signal PS11116 5M Certified USB cables USB Cabling
Newlink USB 4-Port Hubs USB Hubs
Integral “Splash Black” USB flash drive (8GB) Full Speed Qualifier
HP 672652-001 Mouse for Port 1
Logitech 810-003656 Mouse for Port 2
TektronixUSB test fixture TDSUSBF Test Fixture
NMUSB2022PMC is equivalent to one USB hub for dynamic characteristics, verified by the setup in the figure below for worst case USB specification of 5 cascaded
hubs. The host PC counts as one hub.
The ‘eye’ diagram is an indication of adequate data quality after the worst case of five cascaded USB hubs.