Samsung WIDT20R Users Manual
,
* Information for OEMintegrator
e
o
nd
all
r ual
whi
ch
d rs
tnclud
f
ormati
ti
on.
o
pli
a
alled
ith
”
A
* Information for OEM integrator : The OEM integrator has to be aware not to provide information to the end user regarding how to install or
remove this RF module in the user manual of the end product.
remove
The user manual which is provided by OEM integrators for end users must include the following information in a prominent location.
“T
“To comply with FCC RF exposure compliance requirements, the antenna used for this transmitter must be installed to provide a separation
distance of at least 20 cm from all persons and must not be co-located or operating in conjunction with any other antenna or transmitter.”
stance f
Label for end product must include “Contains FCC ID: A3LWIDT20R/ IC ID:649E-WIDT20R or
abel
“ A RF transmitter inside
s
e
omplywith FCC
or
1. Introduction
1. Introduction
WIDT20R is a USB embedded module compliant with IEEE802.11n standard. The
WIDT20R is a USB embedded module compliant with IEEE802.11n standard. The
core chipset is from Ralink, part number is RT5572. m
core chipset is from Ralink, part number is RT5572.
2. Hardware Architecture:
2. Hardware Architecture:
module the user manualof the ndroduct.
east 20
nd roduct must nclude
ransmitter inside,
+VGO 8GPFGT 2CTVPWODGT
+VGO 8GPFGT 2CTVPWODGT
0$&%%35DGLR7UDQVFHLYHU3$ 5DOLQN 57
0$&%%35DGLR7UDQVFHLYHU3$ 5DOLQN 57
s
rovided
xposure com
m from ersons and must note co-locatedor
FCC ID: A3LWIDT20R/ IC ID:649E-WIDT20R”.
2.1 Main Chipset Information
2.1 Main Chipset Information
EM ntegrator
ntegrators
ance requirements, thentenn
ontains
D: A3LWIDT20R/ IC ID:649E-WIDT20R”.
to
or en
ID: A3LWIDT20
war
ICD:649E-WIDT20R
rovide
perating
nformation t
e ollowingn
ransmitter must nst
conjunction w
any ther antenna ransmitter.
egarding
n
prominentoca
torovide
w nst
eparation
r
2.2 Circuit Block Diagram
2.2 Circuit Block Diagram
The major internal components and external interfaces of WIDT20R are illustrated in Figure 1-1.
The major internal components and external interfaces of WIDT20R are illustrated in Figure 1-1.
Figure 1-1 WIDT20R Major Component and System Interface
Figure 1-1 WIDT20R Major Component and System Interface
g
3. Antennas Information
Two SMD a
ntennas supporting both TX & RX.
Hz
4. Operational Description
WIDT20R is the 802.11a/b/g/n RF Module, that acts as a communication hub for users of a
wireless device to connect to a wired LAN.
MIMO type
Product type: WLAN (11b mode: 1TX, 1RX, 11g mode: 1TX, 1RX, n mode: 2TX, 2RX)
Time base of the transmission frequency
For IF and RF frequency, Crystal is a clock reference.
Synthesizer
Synthesizer inside Transceiver. Internal voltage controlled oscillator (VCO) provides the desired
LO signal base on the phase-locked loop (PLL) with a relatively wide tuning range for this
application.
Transmission
Base-band Processing (BBP) IC has DSSS (BPSK/QPSK/CCK) and OFDM
(BPSK/QPSK/16QAM/64QAM) modulation function, it provides transmission data rate are 1, 2,
5.5, 11 Mbps on DSSS and 6, 12, 18, 24, 36, 48, 54 Mbps on OFDM. Digital data signal will be
converted to analog (TX IQ) signals through DAC in BBP IC, TX IQ pass through to low pass
filter. TX I/Q signal use direct conversion (zero-IF) architecture converter to generate carrier
frequency signal. Transceiver IC and internal PA magnify output power.
Receiver
Reverse direction isolation of LNA inside Transceiver IC suppresses unwanted radiation. Then
RF signal will be directly down to IF signal (RX IQ) and high frequency spurious emissions are
suppressed by LPF. At last RX IQ signal will be demodulated digital data.
Base band Processing
1. Channel selection is controlled by BBP IC to support data modulation:
- DSSS (BPSK/QPSK/CCK)
- OFDM (BPSK/QPSK/16QAM/64QAM)
Power Control Level
It uses closed-loop power control function to limit RF output power level.
Transmit/Receive Switch
EUT has Transmit/Receive Switch and Antenna switch. End user can’t select any power setting.
Channel Selection Restriction
For product available in the USA/Canada/Taiwan market, only channel 1~11 can be operated.
Selection of other channels is not possible. But product also could be available in the
Europe/Japan market, channel 1~13 can be operated under the manufacturer change the different
driver.
Data Rate Control
The operation date rate is changing during data transfer base on the optimization of driver.
Discontinue Transmitting with absence of Data or operational failure states
“The device shall automatically discontinue transmission in case of either absence of information
to transmit or operational failure. These provisions are not intended to preclude the transmission
Loading...