Samsung WDG720M User Manual

Manual For WDG720M
SAMSUNG ELECTRONICS CO., Ltd.

Wi-Fi module(2.4GHz, 5GHz, a/b/g/n)

- Model name : WDG720M

- Operation Temperature : -10℃ ~ +70℃

- Power : +5V ±5% (+4.75V ~ +5.25V)

1. Introduction

WDG720M is a USB embedded module compliant with IEEE802.11n standard.
Thecore chipset is from MTK, part number is RT3572L.

2. Operational Description

WDG720M is the 802.11a/b/g/n RF Module, that acts as a communication hub for users of a
wirelessdevice to connect to a wired LAN.

MIMO type

Product type: WLAN (11b mode: 1TX, 1RX, 11g mode: 1TX, 1RX, 11n 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
LOsignal 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, 11Mbps on DSSS and 6, 12, 18, 24, 36, 48, 54 Mbps on OFDM. Digital data signal will be
converted toanalog (TX IQ) signals through DAC in BBP IC, TX IQ pass through to low pass
filter. TX I/Q signaluse direct conversion (zero-IF) architecture converter to generate carrier
frequency signal. TransceiverIC and internal PA magnify output power.

Receiver

Reverse direction isolation of LNA inside Transceiver IC suppresses unwanted radiation. Then
RFsignal will bedirectly down to IF signal (RX IQ) and high frequency spurious emissions are
suppressed by LPF. Atlast 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.
Selectionof 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
totransmit or operational failure. These provisions are not intended to preclude the transmission
of controlor signaling information or the use of repetitive codes used by certain digital
technologies to completeframe or burst intervals. Applicants shall include in their application for
equipment authorization adescription of how this requirement is met.” Data transmission is
always initiated by software, which isthen 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
waysthe digital baseband portion will turn on the RF transmitter, which it then turns off at the end
of thepacket. Therefore, the transmitter will be on only while one of the aforementioned packets
is beingtransmitted.

Product Details

> Data Modulation OFDM (BPSK / QPSK / 16QAM / 64QAM)
> Frequency : 2.4GHz and 5GHz
> 802.11 a/b/g/n MIMO Type
>Power : +5V ±5% (+4.75V ~ +5.25V)