RNDDA579HWIRELESS HEADSET

2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Circuit Explanation 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Base Circuit Description The signal which inputted in TEL-LINE(J701) is coupled at RL700 and RL701, this signal is passed through Configuration switch, SW303, T300 and transformed Analog into Digital at U1. Data which is transformed into Digital signal is mixed with PN code at U1 (by spread spectrum) and transmitted to RF part. Spreading signal which inputted to RF part is mixed with Carrier supplied to VCO (U903) and create TX frequency of using channel and then is transmitted to ANTENNA through U801 by TX control of U802. The signal received to antenna is transmitted to U901 by RX/TX control time. The signal inputted at U901 is mixed Carrier of VCO(U903) and got to direct conversion and create Base band signal. And then, create I and Q signal by demodulation (QPSK : Quadrature Phase Shift Keying method is phase- shifted by 90 ° ). I and Q signal (Two signal phase is 90 °) is transmitted to U1 and remixed with PN code and enerated Digital signal. Digital signal is transformed into Analog at U1. This audio signal is passed through U42, T302, Configuration switch, RL700, RL701 and transmitted to TEL-LINE(J701). Hand Circuit Description The signal which is inputted to MIC is transformed Analog into Digital at U701. DATA which is transformed into Digital signal is mixed with PN code at U701 (by spread spectrum) and transmitted to RF part. Spreading signal which inputted to RF part is mixed with Carrier supplied to VCO(U903)and create TX frequency of using channel and then is transmitted to ANTENNA through Q900, Q901 The signal received to antenna is transmitted to U901 by RX/TX control time. The signal inputted at U901 is mixed Carrier of VCO(U903) and got to direct conversion and create base band signal. And then, create I and Q signal by demodulation (QPSK : Quadrature Phase Shift Keying method is phase- shifted by 90 ° ) I and Q signal (Two signal phase is 90 °) is transmitted to U701 and remixed with PN code and generated Digital signal. Digital signal is transformed into Analog at U701. This audio signal is passed through receiver and transmitted. 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation RF Circuit Description LO Generation : The LO signal is generated by a programmable PLL frequency synthesizer in the U901(RF109) and the an external 2.4GHz VCO(U903). The RF109 synthesizer requires differential input signals from the external VCO to generate the LO Frequency. Therefore a BALUN(U905) transformer is used to generate differential signals from single-ended VCO output. Receive Path : The signal is received at the antenna and pass the T/R switch(U802) and an RF bandpass filter. The output of the bandpass filter is ac-coupled to the Low Noise Amplifier (LNA) of the U901. The U901 downconverts the RF signal into In-phase( I) and Quadrature signal(Q) baseband signals. The differential I and Q baseband signals are dc-coupled to the ASIC(U1 or U303) RXIP, RXIN, RXQP and RXQN inputs. Transmit Path Base unit : The baseband digital data input signal is shaped by external filter (R919,C925, L901, C924, R918) and inputted to the TXD1 Port of the U901 (RF109). The inputted baseband digital data is mixed with Carrier supplied to VCO (U903) and transmitted to the U801 (RF110) with a phase difference of 180 degreed between the two branch. The inputted a differential signals to the U801 (RF110) are amplified by the U801 (RF110) And the differential output signals of the U801 (RF110) output port are converted to a single- Ended signal at the RF matching network. Handset : The baseband digital data input signal is shaped by external filter (R919,C925, L901, C924, R918) and inputted to the TXD1 Port of the U901 (RF109). The inputted baseband digital data is mixed with Carrier supplied to VCO (U903) and transmitted to the Q901. The inputted a single-Ended signals is amplified by the Q900, Q901 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation User’s Manual GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG DA579 USER GUIDE T T T o o o t t t a a a l l l l l l y y y W W W i i i r r r e e e l l l e e e s s s s s s ! ! ! ! ! ! D D D A A A 5 5 5 7 7 7 9 9 9 GGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGGG DA579 USER GUIDE IMPORTANT SAFETY INSTRUCTIONS When using your Headset equipment, basic safety precautions should always be followed to reduce the risk of fire, electric shoc k, and injury to persons, including the following: 1. Read and understand all instructions. 2. Unplug this product from the wall outlet before cleaning. Do not use liquid cleaners or aerosol cleaners. Use a damp cloth for cleaning. 3. Do not use this product near water, for example, near a bathtub, washbowl, kitchen sink, or laundry tub, in a wet basement or n ear a swimming pool. 4. Do not place this product on an unstable cart, stand, or table. The product may fall, causing serious damage to the product. 5. This product should be operated only from the type of power source indicated on the marking label. If you are not sure of the t ype of power supply to your home, consult your dealer or local power company. 6. To reduce the risk of electric shock, do not disassemble this product, but take it to a qualified service contractor when some service or repair work is required. Opening or removing covers may expose you to dangerous voltages or other risks. Incorrect reassembly c an cause electric shock when the appliance is subsequently used. 7. Unplug this product from the wall outlet and refer servicing to qualified service personnel under the following conditions: A. When the power supply cord or plug is damaged or frayed. B. If liquid has been spilled into the product. C. If t…

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2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Block Diagrams 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation DA579 Spread Spectrum Telephone System Architecture DA579 ASIC Block Diagram 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation DA579 CODEC Block Diagram DA579 RF Block Diagram

2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation BACKMI Corporation 2.4GHz DSS Digital Cordless Headset ( FOR FCC & CE APPROVAL ) 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation DA579 FCC Document Contents 1. General Description 2. Processing Gain Measurement 3. FCC Test Support Program Application Note 4. Frequency Table 5. Block Diagram 6. Schematics 7. Circuit Explanation 8. Parts List 9. PCB Layout 10. User’s Manual 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation General Description 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Basic feature list
HIGH PERFORMANCE CONEXANT CHIPSET
BETTER VOICE QUALITY
40 CHANNEL RF OPERATION
16 MILLION AUTO-SECURITY CODE COMBINATION Base Unit feature list
INNER ANTENNA
IN-USE LED INDICATOR
CHARGE LED INDICATOR
POWER LED INDICATOR
PAGE BUTTON USED TO PAGE THE HANDSET PARTY AND TO STOP PAGING CHARGING CONTACT
AUDIO SELECT BUTTON
CONFIGULATION SWITCH
RECORD JACK
EXT. AUDIO JACK
LIFT JACK Handset feature list
INNER ANTENNA
AUTO ANSWER (WHEN PICJ UP THE HANDY DURING INCOMING RING)
AUTO STAND-BY
8 USER SELECTABLE VOLUME CONTROL
AUDIBLE AND led INDICATOR OUT OF RANGE WARNING
ANY KEY ANSWER
POWER SWITCH
TALK ON/OFF 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Specification 1. REFERENCE SPECIFITION
Designed to conform to RF regulations FCC PART 15
Designed to conform to SAFETY regulations
POWER : 9V DC 300mA CLASS 2 TRANSFORMER WALL ADAPTOR PROVIDED
N T E R C O N N E C T I O N : RJ-11 JACK PROVIDED : DC JACK CORD PROVIDED
HAND SET VOLUME CONTROL RANGE : Min. 13 dB 2. GENERAL SPECIFICATION
FREQUNCY BANDWIDTH : 2403 ~ 2475MHz BAND WIDTH
NUMBER OF CHANNEL : 40 CHANNELS
CHANNEL SPACE : 1.8 MHz
SPEECH CODER : 32Kbps ADPCM with parity
TYPE OF RF MODULATION : DBPSK MODULATION / DEMODULATION
PROCESSING GAIN : 1 1 d B
DATA RATE : 80Kbps Time Division Duplex
FRAME TIME : 1ms Transmit / 1ms Receive
SAMPLE RATE : 1.92M SAMPLES/S ( 2 SAMPLES / CHIP )
TX POWER LEVELS(RF OUTPUT TERMINAL CONTACT) - HAND : 0dBm - BASE : 0dBm, -10Bm, -20dBm
RECEIVER SENSITIVITY : -102dBm, -82dBm
ADDTIONAL SECURITY : 2^24 SECURITY CODES
STANBY TIME : 1 4 d a y s
TALK TIME : 5 hours
BATTERY CAPACITY : 3.7 V DC/550mAh 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation 3. RF SPECIFICATION
POWER LINE CONDUCTED EMISSIONS : SECTION 15.207 PASSED (CLASS B REQUIREMENT)
B A N D W I D T H : SECTION 15.247( a ) PASSED ( 700KHz > 500KHz )
POWER OUTPUT : SECTION 15.247( b ) PASSED
SPURIOUS EMISSIONS(CONDUCTED) : SECTION 15.247( c ) PASSED AT BAND EDGES : 25.3dBc < 20dBc
S P U R I O U S E M I S S I O N S ( R A D I A T E D ) : SECTION 15.247( c ) PASSED PER SEC 15.209(30 - 960MHz) UP TO 10 th HARMONICS
P O W E R S P E C T R A L D E N S I T Y : SECTION 15.247( d ) PASSED (5.47dBm < 8dBm )
PROCESSING GAIN SECTION 15.247( e ) PASSED (11.2dB > 10dB ) 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Processing Gain Measurement 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Processing Gain Measurements for DA579 1. Scope This document details the results of measurement of the processing gain of a DCT DA579 phone with reference to the Code of Federal Regulations, Title 47, Chapter 1, Part 15 Radio Frequency Devices (FCC). FCC Federal Communications Commission SNR Signal to Noise Ratio JSR Jammer to Signal Ratio CW Continuous wave (jammer) HS Handset BS Base station DBPSK Differential Binary Phase Shift Keying Table 1. Abbreviations 2. An Overview of the Processing Gain Processing Gain Calculation Theoretical processing gain limit for the 12bit Spreading BPSK system is 10.8dB. Processing Gain Measurement Method Following method is specified by the FCC to measure processing gain. The detailed are in FCC documents 15.247 (e)(1). This involves transmitting a CW jammer in the RF passband of the system and measuring the jammer to signal ratio (JSR) required to achieve a certain bit error rate. The choice of the actual value of the bit error rate is left up to the tester. The jammer is stepped in 50 kHz increments across the entire passband and in each case the JSR to achieve the desired bit error rate is measured. The JSR is measured at the RF input to the system under test. The lowest 20% of the JSR data (in dB) are discarded. The processing gain can then be calculated as follows: - system measuredtheory p L S J N S G+       +       = where G p is the processing gain, the SNR is that theoretically predicted for the system under the test to achieve the desired bit error rate, the JSR is the lowest value (in dB) in the remaining data set and L sys adjusts for non-ideal system losses. L sys can not be greater than 2 dB. 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation 3. Processing Gain Measurement Test Setup The following parameters were used in the test setup. HS Tx power (dBm) -1.9 BS LNA gain (dB) 0 Channel attenuation (dB) -50 Test system losses (signal) (dB) -11.75 -4.05 dB (system), -6 dB (signal combiner), -1.7 dB (2 cables) Test system losses (jammer) (dB) -12.85 -12 dB (signal combiner), -0.85 dB (cable) Table 2. Test Setup Parameters Signal Combiner -6 dB cable (-0.85 dB) RF Attenuator (-50 dB) cable (-0.85 dB) RF Signal generator (HP8663A) -12 dB cable (-0.85 dB) additional system loss (-4.05 dB) (voice signal only) 2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation 4. Results & Calculation The following measurement results were taken at the base station. The desired bit error rate was set at 10 -3 . Jammer Frequency (MHz) BER (BS) Received jammer power (dBm) Received signal power (dBm) Jammer/Signal ratio (dB) 2404.8 9.4 ×10 -4 -59.55 -63.65 4.1 2406.6 9.6 ×10 -4 -57.95 -63.65 5.7 24…

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2.4GHz DSS DIGITAL CORDLESS HEADSET MODEL : DA579 USA VERSION BACKMI Corporation Schematics AA BB CC DD EE D D C C B B A A VCOSHIELDAREA 2003.10.22 DASAN ELECTRO DA579 HAND RF TitleSize Document Number Rev Date: Sheet of VCO-VCO+ PAIN+ RF RF RF RF RF RF RF RF RF RF VREG RF RF RF RF RF RF RF RF RF RF VCC VCC VCC RF RF RF RF RF RF RF RF VCC RF RF RF RFRF RF RF RF RF RF RF RF RF RF RF RF RFRF RF VREG RF RF RF RF VCC RF RF RF RF RF RF RF RF VCC RF RF RF RF RF RF RF RF RF RF RF Q902 PMST3906 1 23 C9911.5pf 12 R9291K 1 2 R92847K 1 2 R92547 12 C9921.5pf 12 C9931.5pf 12 R92222K 12 Q903 PMST3904 1 23 C9528.2p 12 C8151pF 1 2 2450MHzBPF FL801 LCB22M2450B1 1 2 3 4 C953open 12 R926100 12 C81612pf 1 2 RX ANTENNA 1 R910open 12 R9114.7K 1 2 C946102 12 Q900 TSDF1920W 1 23 Q901 TSDF1920W 1 23 C9511.5pf 1 2 TX ANTENNA 1 C9541.5pf 1 2 R92710K 1 2 C9508.2pf 12 C912823 1 2 C913823 1 2 R9203.3K 1 2 R916 820 12 + C905TAN 22uf PN R919390 12 L901 82UH 1 2 C9238.2pf 12 C924821 12 R91710.0 1 2 C909103 1 2 C922103 12 C916 473 12 C920 152 1 2 R90210 1 2 C9450.5pf 1 2 R9244.7K 1 2 C9181.8pf 1 2 C9191.0pf 12 TP3 TP2 C904103 12 C906102 12 C9018.2pf 12 C907563 12 R914470 1 2 C917222 12 C915 473 12 C9038.2pf 12 C925821 12 R90110.0 12 C902473 12 R918390 12 R92151K 12 C9328.2pf 12 C9378.2pf 12 C9418.2pf 12 C9428.2pf 12 + C929TAN 4.7uf PN C930 473 12 TP7 R9151.2K 12 U902 NJM2871AF03 132 546 CTRLBYPGND1 GND2 OUT VCC C921 152 1 2 C908391 1 2 R90310k 1 2 TP5 TP4 TP1 C9148.2pf 12 C926331 12 R90991 12 R90791 12 R92322K 12 C9438.2pf 12 C944102 12 C9388.2pf 12 C931102 12 C9368.2pf 12 C9358.2pf 12 C934102 12 RF109 TQFP48EP Jan 20, 1999 U901 2345689 1011 20 15 16 18 19 13 21 22 23 24 14 25262728293132333435 38 44 45 46 47 1 12 30 39 43 7 17 36 37 40 41 42 48 CLKFREFDATATXD2VCCMIXTXD1RXENALNAATTENLNAIN MODR RFOUT RFOUT TXENA MIXBPC GMC_RES PS1 PS2 GCREF GC GNDSHIELD VCCBBAMP BBOUTQ BBOUTQ BBOUTI BBOUTI VCCBB SERVOQ SERVOQ SERVOI SERVOI VCO VCCVCOBUF VCCSYN SYNTHENA LOADENA NC1NC2 GNDBB VCO CHPO VCCLNA LNADUMP NC3 NC4 NC5 NC6 NC7 NC8 C91012pf 1 2 C91112pf 1 2 R904100 12 U905 LDB15C101A2400 654 321 NCGNDOUT OUT GND INPUT C9278.2pf 1 2 C928102 1 2 R908 75 1 2 R90610 12 R90510k 1 2 U903 SV0706-2450R3V 100M M G1 PB G3 C G2 G4 NC GND OUTVCC GND TUNE GND GND TXDATA LNAIN RXEN SYNDATA REFOSCSYNCLKSYNSTBSYNEN TXENRXQPRXQNRXIPRXINAGC LNAATTN LNAIN TXEN



    
    
    
      
      
      
     
     
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