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參數(shù)資料
| 型號(hào)： | LX7203-XX |
| 廠商： | Microsemi Corporation |
| 英文描述： | EMI Filter & ESD Protection for Up Stream USB Ports |
| 中文描述： | EMI濾波器 |
| 文件頁數(shù)： | 3/7頁 |
| 文件大小： | 315K |
| 代理商： | LX7203-XX |
LX7203-xx
P
RODUCTION
D
ATA
S
HEET
Microsemi
Integrated Products Division
11861 Western Avenue, Garden Grove, CA. 92841, 714-898-8121, Fax: 714-893-2570
Page 3
W
M
.
C
EMI Filter & ESD Protection for Up Stream USB
Ports
Copyright
2002
Rev. 1.0a, 2002-10-22
I N T E G R A T E D P R O D U C T S
A P P L I C A T I O N C I R C U I T S
USB
Transceiver
Host or Hub (downstream port)
Peripheral (upstream port)
USB
Transceiver
1
6
5
4
3
2
V
BUS
GND
C
R
S
R
PD
R
PD
R
S
C
1
6
5
4
3
2
V
BUS
GND
R
S
C
R
S
C
R
PU
LX7203
LX7201
Figure 1 –
Typical Application
A P P L I C A T I O N I N F O R M A T I O N
The LX7203 meets the requirements of the USB v1.1
specification for device termination, EMI filtering and ESD
protection. The R
S
resistor provides the proper signal
termination; the C
EDGE
capacitor controls the signal rise and
fall slew; the TVS diodes protect the IC from ESD damage;
and the total capacitance and resistance creates a low pass
filter eliminating the high frequency energy from the circuit.
The LX7203 can configure the upstream port for either Full-
Speed or Low-Speed operation. The figures below show the
proper connection in accordance with the USB v1.1
specification.
F
ULL
S
PEED
D
EVICE
(F
IGURE
2)
The USB specification offers a 12 Mbps data transfer
rate known as Full-Speed which requires a 1.5 k
pull-up
resistor to be connected to the D+ line. Slew rate control
is accomplished with C
EDGE
attached to the transceiver
before the R
S
.
Voltage Supply (Vbus) is connected to Pin 5
Ground is connected to Pin 2
D+ from the connector is routed to Pin 1 (1.5 k
pull-up
resistor) and Pin 6 to the D+ line of the USB
Transceiver
D- from the connector is routed to Pin 3 and Pin 4 to
the D- line of the USB Transceiver
cable
Host
USB
Transceiver
GND
D+
D-
V
BUS
Peripheral
USB
Transceiver
GND
D+
D-
V
BUS
R
PU
1
6
5
4
3
2
V
BUS
D
IN
from connector
D
OUT
to IC
GND
D
IN
from connector
D
OUT
to IC
LX7203
Figure 2 –
Connection for Full Speed Operation
A
P
P
L
I
C
A
T
I
O
N
S
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