Samsung WLM720B Users manual

Version 1.2

WiSOL

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Item

Vendor

Part Number

IEEE802.11 b.g.n

mac/baseband/radio

REALTEK

RTL8192EU

RTL8192EU

X-tal

(40MHz)

Balun

Filter

GND

USB I/ F(2)

VDD(+3.3Vdc)

Chip Antenna #1

HSDP

HSDM

WOWLAN

SUSPEND

+3.3Vdc

Inter face PAD

Balun

Filter

Chip Antenna #2

Manual for WLM720B WiFi module

1. Introduction

WLM720B is a Wi-Fi module compliant with IEEE802.11 b.g.n MAC/baseband/radio optimized for low-

power applications. The core chipset is from

2. Hardware Architecture:

2.1 Main Chipset Information

2.2 Circuit Block Diagram

The major internal and external block diagram of WLM720B is illustrated in Figure 1-1.

REALTEK, part number RTL8192EU.

Figure 1-1 WLM720B block diagram and System Interface

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3. Operational Description

WLM720B is the 802.11 b/g/n RF Module that acts as a communication controller for users of a wireless

device to connect to WiFi TV. This uses IEEE 802.11n network with 13 channels at 2.4GHz

- Features

■ 2x2 MIMO technology improves effective throughput and range over existing 802.11 b/g/n products

■Operates in 2.4 frequency bands

■Freq. Bands Frequency : 2.412-2.472 GHz, 2.484 GHz

■ Data rates of up to 150 Mbps for 20 MHz channels and 300 Mbps for 40MHz channels

■ 802.11e-compatible bursting

■ Support for the IEEE 802.11e, and i standards

■ BPSK, QPSK, 16 QAM, 64 QAM, DBPSK, DQPSK, and CCK modulation schemes.

■WEP, TKIP, and AES hardware encryption Schemes



- Time base of the RF frequency

For IF and RF frequency, a crystal(40MHz) 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.

- Power Control Level

It uses open-loop power control function to limit RF output power level using a calibration file.

- Integrated Network Processor

Network processor manages Wi-Fi link operations. The network processor code is loaded automatically

from a ROM. The network processor is optimized for energy efficient communications

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- Product Details

● Standard 802.11b/g/n

●Data Transfer Rate: 1,2,5.5,6,11,12,18,22,24,30,36,48,54,60,90,120,180,240,270 and

maximum of 300Mbps

●Modulation Method BPSK/ QPSK/ 16-QAM/ 64-QAM/ DBPSK/ DQPSK/ CCK

●Frequency Band 2.4GHz ISM Band

●Spread Spectrum:

IEEE 802.11b: CCK (Complementary Code Keying)
IEEE 802.11g/n:OFDM (Orthogonal Frequency Division Multiplexing)

●Security: 64 bit/128 bit WEP, TKIP, AES, WPA, WPA2

●Interface: USB 2.0

●Operating Temperature: 0 – 50° C ambient temperature

●Storage Temperature : -10 ~ 70°C ambient temperature

●Humidity 5 to 90 % maximum (non-condensing)

●Size 25 x 12 x 2mm (L x W x H)

-DC power input:

DC 3.3V (Minimum: 3.135V, Typical: 3.3V, Maximum: 3.465V

4. Notice