Samsung Electronics Co WIDT20R Wi-Fi Module User Manual manual

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Document ID	1644231
Application ID	NvXL7/GFTWDSfSA2lE+mfw==
Document Description	manual
Short Term Confidential	No
Permanent Confidential	No
Supercede	No
Document Type	User Manual
Display Format	Adobe Acrobat PDF - pdf
Filesize	26.81kB (335136 bits)
Date Submitted	2012-02-27 00:00:00
Date Available	2012-08-25 00:00:00
Creation Date	2012-01-06 11:24:23
Producing Software	Acrobat Distiller 8.1.0 (Windows)
Document Lastmod	2012-01-06 11:25:39
Document Title	Microsoft Word - WiDT20R_Operation description.docx
Document Creator	PScript5.dll Version 5.2.2
Document Author:	katie_gu

* 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.
for
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i t
f end
d users mustt include
i l d the
th following
f ll i information
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ti in
i a prominent
t location.
ti
“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.”
Label for end product must include “Contains FCC ID: A3LWIDT20R/ IC ID:649E-WIDT20R or
“ A RF transmitter inside, FCC ID: A3LWIDT20R/ IC ID:649E-WIDT20R”.
1. Introduction
WIDT20R is a USB embedded module compliant with IEEE802.11n standard. The
core chipset is from
m Ralink, part number is RT5572.
2. Hardware Architecture:
2.1 Main Chipset Information
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2.2 Circuit Block Diagram
The major internal components and external interfaces of WIDT20R are illustrated in Figure 1-1.
Figure 1-1 WIDT20R Major Component and System Interface
3. Antennas Information
Two SMD antennas 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
of control or signaling information or the use of repetitive codes used by certain digital
technologies to complete frame or burst intervals. Applicants shall include in their application for
equipment authorization a description of how this requirement is met.” Data transmission is
always initiated by software, which is then passed down through the MAC, through the digital
and analog baseband, and finally to the RF chip.
Several special packets (ACKs, CTS, PSPoll, etc...) are initiated by the MAC. These are the only
ways the digital baseband portion will turn on the RF transmitter, which it then turns off at the
end of the packet. Therefore, the transmitter will be on only while one of the aforementioned
packets is being transmitted.
Product Details
> Modulation see the below table for draft n
> Data Modulation OFDM (BPSK / QPSK / 16QAM / 64QAM)
> Frequency : 2.4GHz and 5GHz
> Data Rate (Mbps) see the below table for Draft n
> Channel Number 4 for 20MHz bandwidth ; 2 for 40MHz bandwidth
> Channel Band Width (99%) MCS8 (20MHz): 18.08 MHz ; MCS8 (40MHz): 36.48 MHz
Modulation modes

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