USBUF01P6 STMicroelectronics, USBUF01P6 Datasheet - Page 4

• Manufacturer Part Number: USBUF01P6
• Description: IC EMI FLTR/LINE TERM SOT-666
• Manufacturer: STMicroelectronics
• Series: IPAD™r

Specifications of USBUF01P6

• Filter Type: Signal Line
• Mounting Type: Surface Mount
• Termination Style: Surface Mount (SMD,SMT)
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Inductance: -
• Lead Free Status / Rohs Status: Lead free / RoHS Compliant
• Other names: 497-3282-2

Technical information
2.1.1
4/9
Figure 4.
-10.00
-
-12.50
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-15.00
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-17.50
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-20.00
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-22.50
-
-25.00
-
-2.50
-
-5.00
-
-7.50
-
0.00
dB
1.0M
EMI filtering
Current FCC regulations require that class B computing devices meet specified maximum
levels for both radiated and conducted EMI.
●
●
For the types of device compliant with the USB standard, the most difficult test to pass is
usually the radiated EMI test. For this reason the USBUF01P6 device aims to minimize
radiated EMI.
The differential signal (D+ and D-) of USB devices does not contribute significantly to
radiated or conducted EMI because the magnetic field of each conductor cancels out the
other.
The inside of a PC product is very noisy and designers must minimize noise coupling from
the different sources. D+ and D- must not be routed near high speed lines (clock spikes).
Induced common mode noise can be minimized by running pairs of USB signals parallel to
each other and running grounded guard trace on each side of the signal pair from the USB
controller to the USBUF device.
If possible, locate the USBUF device physically near the USB connectors. Distance between
the USB controller and the USB connector must be minimized.
The 47 pF (C
control, and are placed between the driver chip and the series termination resistors (R
Both C
The USBUF01P6 ensures a filtering protection against electro-magnetic and radio
frequency Interference thanks to its low-pass filter structure. This filter is characterized by
the following parameters:
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●
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USBUF01P6 typical attenuation
curve
3.0M
Radiated EMI covers the frequency range from 30 MHz to 1 GHz.
Conducted EMI covers the 450 kHz to 30 MHz range.
Cut-off frequency
Insertion loss
High frequency rejection.
t
10.0M
and R
30.0M
t
) capacitors are used to divert high frequency energy to ground and for edge
f/Hz
t
should be placed as close to the driver chip as is practicable.
100.0M
300.0M
1.0G
3.0G
Doc ID 9883 Rev 7
Figure 5.
Vg
Measurement configuration
50
TEST BOARD
USBUF01P6
50
t
).