LX7203-XX MICROSEMI [Microsemi Corporation], LX7203-XX Datasheet - Page 4

• Manufacturer Part Number: LX7203-XX
• Description: EMI Filter & ESD Protection for Up Stream USB Ports
• Manufacturer: MICROSEMI [Microsemi Corporation]

Copyright  2002
Rev. 1.0a, 2002-10-22
L
rate known as Low-Speed which requires a 1.5 kΩ pull-up
resistor to be connected to the D- line. Slew rate control is
accomplished with C
the R
FCC Part 15 sets limits for maximum allowable EM
emission and susceptibility. There are two types of
emissions.
emission of 0.45 to 30 MHz and radiated emissions with
frequency of emission of 30 MHz to 40 GHz. All digital
computing devices including the peripheral devices must
comply. Examples of peripheral devices include terminals,
printers, external floppy disk drives and other data storage
OW
The USB specification offers a 1.5 Mbps data transfer
Transceiver
S
S
.
PEED
Host
USB
I N T E G R A T E D
D
EVICE
Conducted emissions with frequency of
cable
(
EDGE
FIGURE
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: [phone]
attached to the transceiver before
GND
V
ELECTROMAGNETIC EMISSION AND SUSCEPTABILITY
A P P L I C A T I O N I N F O R M A T I O N ( C O N T I N U E D )
BUS
D+
D-
3)
P R O D U C T S
Figure 3 – Connection for Low Speed Operation
from connector
from connector
Integrated Products Division
GND
Microsemi
D
D
IN
IN
1
2
3
EMI Filter & ESD Protection for Up Stream USB
devices, video monitors, keyboards, control cards, interface
boards, external memory expansion cards and other
input/output devices that may or may not contain digital
circuitry. LX7203 is optimized to minimize the radiated
EMI which is the primary concern in devices using USB.
Refer to the typical filter response curve for the attenuation
characteristics of LX7203 over the frequency range of
30kHz to 6GHz.
LX7203
Voltage Supply (Vbus) is connected to Pin 5
Ground is connected to Pin 2
D+ from the connector is routed to Pin 3 and Pin 4 to
the D+ line of the USB Transceiver
D- from the connector is routed to Pin 1 (1.5 kΩ pull-up
resistor) and Pin 6 to the D- line of the USB Transceiver
R
PU
P
RODUCTION
4
6
5
D
to IC
V
D
to IC
OUT
BUS
OUT
Ports
D
ATA
S
HEET
Transceiver
V
GND
D+
D-
Peripheral
BUS
USB
LX7203-xx
Page 4