Maxon Electronics Australia MM-5500SU 800 MHz EVDO CDMA Wireless USB Modem User Manual FCC MM5500SU

Maxon Electronics Australia Pty. Ltd. 800 MHz EVDO CDMA Wireless USB Modem FCC MM5500SU

Users Manual

1/1 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. FCC Documentation MM-5500SU CDMA 1X/EVDO Data Modem Version : 0.1 Date : Nov. 28, 2004 Maxon Proprietary: Restricted DistributionThis document is the sole and exclusive property of Maxon. Not to be distributed or divulged without prior written agreement. 36a Gibson Avenue, Padstow New South Wales, 2211. Australia Phone: +61 2 9707 2000 URL: http//www.maxon.com.au
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 2/2 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. FCC RF EXPOSURE COMPLIANCE In August 1996 the Federal Communications Commission (FCC) of the United States with itsaction in Report and Order FCC 96-326 adopted an updated safety standard for human exposure to radio frequency (RF) electromagnetic energy emitted by FCC regulatedtransmitters. Those guidelines are consistent with the safety standard previously set byboth U.S. and international standards bodies. The design of this phone complies with theFCC guidelines and these international standards. Use only the supplied or an approved antenna. Unauthorized antennas, modifications, orattachments could impair call quality, damage the phone, or result in violation of FCCregulations. This CDMA Engine (CCE-550) has been tested for FCC RF exposure hand and body SAR compliance with the MM-5500SU Wireless Modem organizer. In order to comply with FCC RF exposure requirements, the CDMA Engine must be operated with the MM-5500SU Wireless Modem organizer. The use of this device in any other type of host configuration may not comply with FCC RF exposure requirements and should be avoided. During operation, a 20 cm separation distance should be maintained between the antenna, whether extended orretracted, and the user’s/bystander’s body (excluding hands, wrists, feet, and ankles) to ensure FCC RF exposure compliance. CAUTION Change or modification without the express consent of Maxon Electronics Australia Pty. Ltd. voids the user’s authority to use the equipment. This equipment has been tested and found to comply with the limits pursuant to Part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in an appropriateinstallation. This equipment generates, uses, and can radiate radio frequency energy and, if not used in accordance with instructions, can cause harmful radiation to radiocommunication. However, there is no guarantee that interference will not occur in aparticular installation. If the equipment does cause harmful interference in radio and television reception, which can be determined by turning the equipment on and off, the useris encouraged to try to correct the interference by one or more of the following measures:  Reorient or relocate the receiving antenna  Increase the separation distance between the equipment and the receiver  Contact Maxon Electronics Australia Pty Ltd. Technical Support for assistance.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 3/3 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. Table of contents 1. Contact Information ···················································································5 2. Product Overview···························································································5 2.1 Overview................................................................................................5 2.2 What is the MM-5500SU Wireless Modem...........................................5 3. Specifications·································································································7 3.1 Mechanical Specifications.....................................................................7 3.2 Environment Specifications...................................................................7 3.3 Electrical Specifications.........................................................................7 3.4 USB specifications ................................................................................7 3.5 CDMA RF Specifications.......................................................................7 4. Instruction·····································································································10 4.1 Supplied accessories ..........................................................................10 4.2 Getting start.........................................................................................10 5. Circuit description ························································································14 5.1 MM-5500SU interface board circuit description..................................14 5.2 Power generating part (MM-5500SU interface board)........................14 5.3 RS-232 transceiver part (MM-5500SU interface board) .....................15 5.4 USB interface part (MM-5500SU interface board ...............................15 5.5 LED driver part (MM-5500SU interface board) ...................................15 5.6 CDMA Engine circuit description.........................................................16 5.6.1 RF part (CDMA Engine)………………….……….………………. 16 5.6.2 Logic Part (CDMA Engine)……………………………………….. 18 6. Range of operating power levels and description of means for variation of operating power ···························································································19 7. Description of frequency determining and stabilizing circuitry·····················20 8. Description of circuit employed for suppression of spurious radiation··········21 9. Description of modulation system used·······················································22
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 4/4 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 1. Contact Information If you have any technical queries about this manual, please contact below : Maxon Electronics Australia Pty Ltd 36a Gibson Avenue Padstow, New South Wales 2211 Australia Phone: +61 2 9707 2000 Fax: +61 2 9707 3328 Mr. Ray Sanders – Managing Director Mr. Ashween Prasad – Technical Manager Email: engineering@maxon.com.au
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 5/5 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 2. Product Overview 2.1 Overview The MM-5500SU Wireless Modem performs data communication functions between Host and IS-95A, B, CDMA2000-1X/EVDO CDMA Cellular station. The MM-5500SU Wireless Modem incorporates the wireless-modem functionality with the USB driver and power adaptor interface. The MM-5500SU Wireless Modem connects directly to HOST computer utilizing an USB V1.1 interface. The MM-5500SU Wireless Modem functionality is specifically controlled from the Host via AT command sets. Range of supply voltage is from 5V to 7V on communication and 5V to 9V on idle. The power saving mode of the MM-5500SU Wireless Modem is controlled from the Host via USB port using AT command. 2.2 What is the MM-5500SU Wireless Modem - IS-95A, B, and CDMA2000-1XEVDO CDMA Protocol Support - USB1.1 Interface for data communication & Standard RS-232C for DM(Diagnostic Mode) - Remote controlled by AT commands - Comprehensive internal monitoring alerts - 5 user profiles - DATA Transmission up to 2.4[Mbps] (network limited) - LED indicating of the modem status - SMS 2-way support - SMA antenna connector - Secure 2-pin power jack - Operating voltage of DC 5~9[V] - Contemporary design - Small size and light-weight
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 6/6 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. Figure 1. Appearance of MM-5500SU
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 7/7 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 3. Specifications 3.1 Mechanical Specifications Table 1. Mechanical specifications Dimensions 93mm x 79mm x 27mm, include projecting connect parts Weight Approx. 110g , except CDMA antenna and cable assemblies Housing Material CASE – SCM4 , SCM45C , Brackets – AL5052 3.2 Environment Specifications Table 2. Environment specifications Power supply voltage DC +5V(minimum) ~ +9V(maximum) on idle state DC +5V(minimum) ~ +7V(maximum) on communication Operating conditions 0°C ~ +60°C , 85%(at 50(C), relative humidity (non-condensing) Storage Temperature -40°C ~ +70°C 3.3 Electrical Specifications Table 3. Current Consumption (Test condition: power supply=+5V, Temp.= 25°C ) Maximum current Under 1.0A Digital block operating voltage +3.0V (typical) On communication @ Maximum TX Power (24+/- 0.3dBm) with USB data communication Under 800mA Power down state - LED off, Modem sleep state Under 30mA (Note) The current consumption might vary of 5% over the whole operating temperature range. 3.4 USB specifications The USB interface implemented in the MM-5500SU Wireless Modem complies with the Universal Serial Bus (USB) Specification Revision1.1. 3.5 CDMA RF Specifications RF performances are compliant with IS-95A/B, cdma2000-1X/EVDO Protocol.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 8/8 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 3.5.1 Transmitter specifications Table 4. Transmitter performances Type of Multiplexing Frequency-Division Duplex Frequency Range 824.64MHz ~ 849.37MHz Channel Number 20CH Bandwidth 1.23MHz Occupied Bandwidth Under 1.32MHz Type of Oscillation PLL Synthesizer & VCTCXO(19.2MHz) VCO Output Frequency Range ( divide-by-2 frequency range) 1372.08MHz ~ 1421.54MHz (686.04MHz ~ 710.77MHz) Intermediate Center Frequency 138.6MHz Modulation Method OQPSK RF Maximum Output Power 0.28W (24.5dBm/1.23MHz) Frequency Stability(Accuracy) Under defined freq. +/- 300Hz Waveform Quality Over 0.944 Conducted Spurious Emission Over carrier +/-900KHz, -42dBc/30KHz Over carrier +/-1980KHz, -54dBc/30KHz Common RF Impedance 50ohm Supplied voltage +3.75V DC @ Power Amp. +2.85V DC @ TX block
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 9/9 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 3.5.2 Receiver specifications Table 5. Receiver performances Type of Receiving Super Heterodyne Method Frequency Range 869.64MHz ~ 893.37MHz Channel Number 20CH Band width 1.23MHz Type of Oscillation PLL Synthesizer & VCTCXO(19.2MHz) VCO Output Frequency Range ( divide-by-2 frequency range) 1372.08MHz ~ 1419.54MHz (686.04MHz ~ 709.77MHz) Intermediate Center Frequency 183.6MHz Modulation Method QPSK Receiver Sensitivity Under -108dBm @FER=0.5% Single Tone Desensitization (-30dBm @FC +/-900KHz) Under -101dBm @FER=1% -43dBm Under -101dBm @FER=1% -32dBm Under -90dBm @FER=1% Inter-modulation (FC(900KHz&1.7MHz) -21dBm Under -79dBm @FER=1% Common RF Impedance 50ohm Supplied voltage +3.0V DC
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 10/10 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 4. Instruction • To prevent fire or shock hazard, do not expose the unit to rain or moisture. • Do not drop the unit or give a shock to the unit, or it may cause a malfunction. 4.1 Supplied accessories - MM-5500SU CDMA 1X/EVDO Modem unit (1) - CDMA Antenna (1) - USB cable assembly (1) - Power adapter assembly (1) 4.2 Getting start First for mounting the MM-5500SU Wireless Modem, bind to the unit the holding bridles and connect accessory following procedure. 1. Connect CDMA antenna to the SMA connector – labeled “SMA Ant” at right bracket 2. Connect USB data cable assembly to the connector – labeled “USB” at left bracket 3. Connect power adapter assembly to the power connector – labeled “PWR” at left bracket Note. Please pull out by grip the plug/connector, not the cable. SMA Ant DATAPWR USB RS-232CDiagnostics Only Figure 3. Left side bracket Figure 2. Right side bracket
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 11/11 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 4.3 Power Cable Guides “PWR” port should be connected with the DC +5 power supply. Table 6. Power connector Termination assignment Connector type Signal name Description + DC Power ( DC +5V ) 2 pins Micro-Fit 3.0 - System reference(ground) Note. To keep overall performance of the MM-5500SU Wireless Modem such as RF, the power supply should meet some electrical characteristics. For best performance, the good supply regulation is required because the most important characteristic of power supply follows the supplied voltage’s stability.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 12/12 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 4.4 Data Cable Guides “RS232C” port should be connected with the TE2’s COM port for DM communication. Figure 4. RS-232C cable of MM-5500SU “USB” port should be connected with the TE2’s USB port for data communication. Figure 5. USB cable of MM-5500SU Multiple service function (ex: SMS, Data and DM communication) of the MM-5500SU Wireless Modem will be serviced to out device through RS-232 and/or USB interface. “USB” port is for data communication and the port can be connected with PC or external device directly. The Modem can communicate with only one port. The Modem is looking for active connection on power up time and communicates with the found connection. If both connections are active, USB will be selected. The USB will be Qualcomm solution which operates under MS-Windows-98SE and MS-Windows2000.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 13/13 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 4.5 LED Display Guides The MM-5500SU has four-LED Display that indicates status of the CDMA Engine. Below the Table 7 shows the status meaning. Table 7. LED Display description LED Display Description PWR Indicate the CDMA power on PKT Indicate connection in Packet Switched mode RSSI Lights on in RSSI > -95dBm, Blinks in -95dBm > RSSI > -105dBm, Turn-off in RSSI < -105dBm SMS LED Blinking is unread SMS message exist
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 14/14 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 5. Circuit description 5.1 MM-5500SU interface board circuit description The MM-5500SU interface board consists of the CDMA Engine(Model name: CCE-550), power generation part, RS-232 & USB transceiver part, LED driver part and connectors. The Fig 1-1 is block diagram of MM-5500SU interface board and CDMA Engine. MM-5500SU interface boardprotectionDCRegulatorCDMA Engine(CCE-550)PowerinterfaceMSM5500Memory-Flash(32Mb)-SRAM(08Mb)RxSynthesizer DUXTxRF partRF Vcc LNAPowerAmpLED driverprotectionprotectionPowerportRS-232portUSBportAntennaportSystemconnectorUSBtransceiver Figure 7. MM-5500SU interface board block diagram 5.2 Power generating part (MM-5500SU interface board) DC Power is supplied by external source – battery or adaptor- operating over 5V to 7V range. - DC Regulator: This component is regulator that accepts input voltage up to 6V DC. Output voltage is about 3.75V DC. This DC regulator output voltage is inputted to CDMA Engine pin (pin signal name: VBATT).
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 15/15 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 5.3 RS-232 part (MM-5500SU interface board) The MM-5500SU wireless modem communicates with PC for DM(Diagnostic Mode) port that indicates the CDMA modem’s status. The CDMA Engine contains UART(Universal Asynchronous Receiver / Transmitter) for DM. The CDMA Engine provides 3.0V CMOS level signals and it is translated to RS-232C signal level at the MM-5500SU interface board. 5.4 USB interface part (MM-5500SU interface board) The MM-5500SU wireless modem contains a USB (Universal Serial Bus) interface to provide an efficient interconnect between the Modem and a Host (PC). The MM-5500SU wireless modem’s USB interface is designed to comply with the Universal Serial Bus specification, Revision 1.1. The MM-5500SU wireless modem’s USB interface supports full-speed (12Mbps) data rates. 5.5 LED driver part (MM-5500SU interface board) Signals outputted from the CDMA Engine are used to control ON/OFF of LEDs. Table 8. LED Display description LED Display Description PWR Indicate the CDMA power on PKT Indicate connection in Packet Switched mode RSSI Lights on in RSSI > -95dBm, Blinks in -95dBm > RSSI > -105dBm, Turn-off in RSSI < -105dBm SMS LED Blinking is unread SMS message exist
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 16/16 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 5.6 CDMA Engine circuit description 5.6.1 RF part (CDMA Engine) RF part consists of power part, synthesizing part, transmission and reception part. Fig 4.2 CDMA Engine block diagram of RF part circuit S1M8656A << CDMA Engine >> Figure 8. CDMA Engine(CCE-550) block diagram
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 17/17 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 5.6.1.1 Frequency synthesizing Part (for CDMA Engine) Frequency synthesizing part called PLL Synthesizer consists of three synthesizer circuit which is first local synthesizer, Tx IF synthesizer and Rx IF synthesizer. The first local synthesizer generates the primary local system oscillation frequency, operating over 1372.08 ~ 1419.54 MHz frequency range. Tx IF and Rx IF synthesizer generate the second local oscillation frequency, 267.2 MHz and 367.2 MHz respectively. 5.6.1.2 Receiving Part (for CDMA Engine) - Duplexer. The duplexer filters the RF signal transmitted through Antenna and sends the signals to LNA. - LNA. This part in front-end is used to amplify the received signal with low noise figure - Down converter. It acts as a mixer using first local frequency to produce the desired signal in the mid-range frequency of 183.6 MHz. - Rx AGC. This part is designed to control the gain of the dynamic range of midrange frequency produced in down converter according 80 dB dynamic range. Currently, previous BBA is divided into S1M8656A(Rx IF-baseband converter) and RFT3100(Tx baseband-IF converter). S1M8656A acts as the baseband analog processor which processing the signals between the S1M8656A and digital processing circuit. In the while, RFT3100 consists of Tx AGC and Tx part analog processor of previous BBA. 5.6.1.3 Transmission Part (for CDMA Engine) - Tx AGC. It is designed to be gain-controlled from 84 dB dynamic range. The gain of this part is controlled by MSM using digital control signal. - Up converter. This part mixes the IF transmission frequency 138.6 MHz and the first local 1372.08 ~ 1419.54 MHz to generate transmission frequency of 824.64 ~ 848.37 MHz. - Power AMP module. This part is designed to work in 824 MHz ~ 849 MHz frequency range in the CDMA mode and can generate the proper output power. The DC voltage and current supplied into the power amp module is typical 3.75V and 0.3A. In this CDMA Engine, power AMP is directly activated using internal DC/DC converter output voltage.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 18/18 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 5.6.2 Logic Part (CDMA Engine) 5.6.2.1 DC Power supply Part(CDMA Engine) The voltage regulator on interface board step-downs the supplied voltage to 3.75V for CDMA Engine. Each block of CDMA Engine uses low-drop-output linear regulator. - U500 : voltage regulator for digital circuit ( 2.8 DC ) - U501 : voltage regulator for VC-TCXO and S1M8656A( 3.0V DC ) - U502 : voltage regulator for RF Rx part ( 3.0V DC ) - U503 : voltage regulator for RF Tx part ( 2.85V DC ) - U505 : voltage regulator for digital part(2.7V DC ) - And power AMP is directly supplied by battery. 5.6.2.2 Digital Part(CDMA Engine) - U400 : MSM(Mobile Station Modem) ASIC is chip responsible for CDMA/FM mobile station’s base-band digital signal processing. For this chip to function, TCXO(19.2MHz) is required as basic clocks And sleep crystal (32.768KHz) is used as clock source of MSM ASIC. MSM consists of CDMA core and DFM core. CDMA core is a part for processing CDMA signal consisting of modulator/demodulator, interleaver/deinterleaver and encoder/decoder in the CDMA mode. 5.6.2.3 Memory Part (CDMA Engine) Memory part consists of Flash memory and SRAM. Flash memory : store to main program. SRAM : performs to read and write data The system adapt CSP type memory, combination to Flash memory and SRAM
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 19/19 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 6. Range of operating power levels and description of means for variation of operating power Dynamic range of output power is from –56dBm to +24.5dBm with ±0.3dB variation in CDMA mode. A temperature-compensated TX AGC (Automatic Gain Control) amplifier with 85dB gain range is included in the RFT3100. The transmit output power level is directly controlled by varying the gain of this TX AGC amplifier. A DC input voltage from the MSM5500 linearly controls the gain of the TX AGC amplifier. The 84 dB dynamic range is 39 dB when the voltage 2.8V and -45 dB in 0.1V. The 81 dB dynamic range (0.3V ~ 2.4V) gain is used in this CDMA Engine. MSM5500) Figure 9. Output Circuit
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 20/20 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 7. Description of frequency determining and stabilizing circuitry Frequency synthesizing part is composed of the first local RX IF synthesizer which is single mode PLL synthesizer and the internal Tx IF and Rx IF synthesizer which are in RFT3100 and S1M8656A chip. These parts generate the first local oscillation frequency, Rx IF frequency and Tx IF frequency. - First local frequency Synthesizer : 1372.08 MHz ~ 1419.54 MHz PLL loop is composed of single PLL synthesizer, Loop filter, VCO and VC-TCXO It generates transmission and reception frequency of 9551372.08 MHz ~ 1419.54 MH - Rx IF synthesizer : 367.2 MHz Rx IF PLL loop is consisted of PLL synthesizer in the PLL module, VCO built in S1M8656A, loop filter and VC-TCXO(Crystal oscillator 19.2 MHz). It oscillates twice the intermediate receiving frequency of 367.2 MHz and then generates 183.6 MHz, Rx IF frequency. - Tx IF Synthesizer : 267.2 MHz The configuration of PLL loop is composed of PLL Synthesizer, VCO which is internally installed, loop filter and VC-TCXO(19.2 MHz). It oscillates twice of the transmission intermediate frequency of 267.2 MHz and then generates Tx IF frequency of 138.6 MHz through the PLL loop. The frequency of 19.2 MHz generated from the VC-TCXO is the main clock of each the frequency synthesizer part. PLL frequency stability is determined by the stability of oscillator of VC-TCXO. This prevents maximum frequency variation from exceeding ±2.0PPM. Duplexer VCOLNA MAXER1372.08~1419.54MHzTX_I &QDualPLL VCTCXO(19.2MHz)183.6MHzAntennaIFR3300AGCRFT3100267.2MHzAGCQuadmodulationTX PLLPAM/2QuadDemodulation I&QLPFs ADCsRX I&Q Data367.2MHzS1M8656A Figure 10. Frequency determining and stabilizing and circuitry
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 21/21 Confidential and proprietary information. This document is the sole and exclusive property of Maxon Australia. Not to be distributed or divulged without prior written agreement. 8. Description of circuit employed for suppression of spurious radiation In the CDMA transmit signal path, the frequency spectrum at the output of the CDMA DACs contains unwanted frequency components due to the DAC output transition edges and transients. The transmit clock frequency and harmonics are found in the spectrum. Each CDMA DAC is followed by an anti-aliasing low-pass filter with a bandwidth of 630 KHz that reduces unwanted frequency components installed in MSM5500. And then Tx IF frequency from the RFT3100 is filtered by bandpass filter. The nominal specification of the filter is as following. - Nominal center frequency : 138.6 MHz - 3 dB Bandwidth : ± 630 kHz - Stop band attenuation : 40dB min. The Tx RF output of the Tx Mixer and the AGC amp is filtered again by the SAW band pass filter. The nominal specification of the filter is as follows. - Pass band : 824 MHz ~ 869 MHz - Attenuation : DC ~ 800MHz : 22 dB min. 869 MHz ~ 1049 MHz : 25 dB min. 1049 MHz ~ 2000 MHz : 19 dB min. Finally, the spurious generated from Power AMP is filtered by the duplexer. The nominal specification of the duplexer is as follows - TX Pass band : 824 MHz ~ 869 MHz - Attenuation : 869 MHz ~ 894 MHz : 40 dB min.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 22/22 Confidential and proprietary information. This document is the sole and exclusive property of Maxon. Not to be distributed or divulged without prior written agreement. 9. Description of modulation system used The CDMA Engine consists of MSM, baseband analog interface (RFT3100, S1M8656A) as modulation system. The MSM integrates functions of a CDMA processing, a digital FM(DFM) processing, CDMA subsystem in the MSM performs CDMA signal processing about CDMA modulation / demodulation, viterbi coding/decoding, interleaving/de-interleaving, and etc. The CDMA baseband processor performs forward-link demodulation, time tracking and reverse-link modulation for CDMA digital signals. The following figure shows a CDMA digital baseband processor block diagram. Figure 11. CDMA digital base-band block diagram The modulator performs the orthogonal modulation, long code PN spreading and quadrature spreading. The resulting data stream is then band limited with FIR filters and sent to the analog base-band processor. The RFT3100 Transmit Signal Path (shown in figure 8-2) accepts analog I and Q data from the MSM and outputs modulated IF centered at 138.6 MHz to the RF transmitter. The RFT3100 transmit path outputs a differential IF signal with spread spectrum modulation expending ±630KHz from the transmit IF center frequency of 138.6 MHz. The analog I and Q base-band components from the CDMA low-pass filters are mixed in quadrature with un-modulated I and Q signals at 138.6 MHz. After mixing, the I and Q IF components are summed and output differentially. The 138.6 MHz I and Q IF VCO signals are generated on the RFT3100.
FCC Documentation MM-5500SU CDMA 1X/EVDO Modem 23/23 Confidential and proprietary information. This document is the sole and exclusive property of Maxon. Not to be distributed or divulged without prior written agreement. The transmitter IF VCO is set to 267.2 MHz by an external varactor-tuned resonant tank circuit. An internal phase-lock loop and external loop filter network provides the feedback to the varactor that tune the VCO precisely to 267.2 MHz. A master-slave divide-by-two circuit generates I and Q signals in precise quadrature for the mixers. MSM5500S1M8656A Figure 12. S1M8656A and RFT3100 functional block diagram

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