VS500 USER MANUAL VS500 User manual of Technical part Rev 1.0 Index Ch 1. General Description 1.1 Introduction Ch 2. Specification 2.1 Basic Specification 2.2 Electrical Specification Ch 3. Circuit Description 3.1 General 3.2 Logic part 3.3 Receiver part 3.4 Transmit part July 8, 2005 H/W 3 Team , R&D Center VACOM WIRELESS INC. Confidential & Proprietary of VACOM 1/13 Page Date : 05-08-08, Rev No : 1.0 Control No.
VS500 USER MANUAL Ch 1. General Description 1.1 Introduction This equipment is a Single mode (CDMA only) portable mobile station of which frequency range is 824 ∼894MHz. It uses 3G CDMA 1x-RTT solution, the MSM6000 Mobile Station Modem Chipset and Software are designed to the IS-2000 Rel.0 Standard and enables up to a doubling of overall IS-95A/B voice capacity and production of cost-optimized voice only handset.
VS500 USER MANUAL Ch 2. SPECIFICATION 2.1 BASIC SPECICATION a. Size(Max`) : 105mm * 45.1mm * 19.9mm b. Weight : 74.5 g (with Standard Battery) c. Supply Voltage : DC 3.8V (±10%) d. Operating Temp. : -30℃ ~ 60℃ e. Battery : 950mAh Li-Ion (Standard) - Talk time( CDMA mode) : 194 min (-92dBm/Half Rate/ 970mAh/E8285A) - Antenna Type : internal PIFA 2.2 ELECTRICAL SPECIFICATION 2.2.1 a. CDMA TRANSMITTER Frequency Range : 824 ~ 849MHz b. Bandwidth : 1.23MHz c. ERP at Max. Output Power : 200mW ~ 1W d.
VS500 USER MANUAL - Receiver Band : -81dBm/1MHz - Transmitter Band : -61dBm/1MHz - Other Band : -47dBm/30KHz Ch 3. CIRCUIT DESCRIPTION 3.
VS500 USER MANUAL - SYSTEM BLOCK DIAGRAM Confidential & Proprietary of VACOM 5/13 Page Date : 05-08-08, Rev No : 1.0 Control No.
VS500 USER MANUAL 3.2.1 CIRCUIT DESCRIPTION a. MSM6000: MSM6000 is a chipset responsible for User Interface, RF Interface, Digital Interface and especially for base-band digital signal processing of CDMA/FM. b. FLASH MEMORY / SRAM: FLASH MEMORY & SRAM is for storing operation program, system parameters and additional parameters to manage handset. And it is a temporally place to preserve all system parameters and data related with Base Station. c.
VS500 USER MANUAL UART2. UART1 is used for test and debugging and user-defined download program. f. JTAG (Joint Test Action Group) Interface: It is used for board test and debugging with Boundary Scan. And it can be used as S/W Upgrade by S/W Downloading function. g. RF Transmit Interface: It controls Tx RF Signal and output power through providing differential Base band I/Q Signals and TX_AGC_ADJ signal. Transmit power strength is controlled by TX_AGC_ADJ which is result of RF calibration in RFT6122.
VS500 USER MANUAL 3.2.1.2.3 Audio AMP/Audio Interface Audio AMP amplifies and sounds Alert Tone or Receiving Call Ringing. Its signal source is from internally generated codec circuit of MSM6000. Its output gain is set by H/W but sound volume can be controlled by S/W. Key Tone is transmitted to Receiver unit after converting VOCODER DTMF Signal in MSM6000 to AUDIO RX PATH Signal. If a hand-free mode is started by using like earphone, Key Tone is sounded through the hands-free path.
VS500 USER MANUAL 3.3 RECEIVER PART - RFR6122 ( LNA + RF to baseband Receiver_Quadrature I/Q Downconverter and internal VCO for CDMA mode ) - Receiver band Pass Filter (balance 100ohm out put impedance) - Antenna - Duplexer 3.3.1 MAIN FUNCTION - Divide Receive/Transmit signal - Low noise Amplify - Direct Conversion - Quadrature Demodulation - Filtering of TX band signal and noise 3.3.2 BASIC OPERATION RX Frequency (881.5 ±12.
VS500 USER MANUAL 3.3.2.3 LNA part of RFR6122:(U511 - LNA part) LNA transfers RF signal received through duplexer from base station as the most suitable signal. Because the first amplifier after the antenna in a receiver block contributes most significantly to system noise figure, LNA is used. Division Specification Frequency range 869 ~894 MHz CDMA Gain mode 0 Division Specification CDMA Gain mode 2 Gain 16 dB (Typ.) Gain -5 dB (Typ.) Noise figure 1.5 dB (Type.) Noise figure 5.5 dB (Type.
VS500 USER MANUAL (18) LO_OUT RFR6122 (16) VCO_TUNE Cell VCO VDDA GND LO Generation &Distribution Ground slug Quadrature Downconverter LNA_IN (6) LNA R_LNA (7) ( 30) TCXO ctls Control Circuits (2) VDDM S B I (3) SBDT (4) SBCK (5) SBST LPF (28) RX_IP (27) RX_IM LPF (25) RX_QP (26) RX_QM RFR6122 Block diagram 3.3.2.
VS500 USER MANUAL antenna. 3.4.2.1 RFT6122 : (U541) The RFT6122 provides the Zero-IF transmitter signal path, from analog baseband to RF drive amplifier, for single band single-mode. Secondary functions are integrated on chip , two PLL circuits(TX LO and RX LO), TX VCO circuit, TX LO generation and distribution circuits, and various interface, control, etc..
VS500 USER MANUAL 3.4.2.4 POWER DETECTOR (D571) It is to detect of Tx output signal for HDET Data. Using schottky barrier diode. 3.4.2.5 Isolator (U573) It is to provide constant load and impedance to PAM. It’s Insertion loss is 0.7 dB typical and isolation is over 15 dB. Confidential & Proprietary of VACOM 13/13 Page Date : 05-08-08, Rev No : 1.0 Control No.