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ADPLP01 数据表(PDF) 4 Page - Analog Devices |
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ADPLP01 数据表(HTML) 4 Page - Analog Devices |
4 / 8 page AD20msp410 –4– REV. 0 Automatic Frequency Control (AFC) The mobile radio has to track precisely the master clock provided by the base station. Drift of the crystal oscillator over time and temperature has to be compensated as well as fre- quency shifts due to the Doppler effect in the case of a moving mobile radio. The received signal is analyzed in the ASP and the PLP and a digital control signal is generated. This signal is sent to the two DACs in the BBC. The 10-bit DAC operates as coarse and the 8-bit DAC as fine adjust. The weighting of the DACs is such, that both DACs yield a combined resolution of 13 bits. The combined analog output signal is used to control the voltage controlled, temperature compensated crystal oscillator (VCTCXO). Synthesizer Control The PLP and the respective parts of the Layer 1 software control the overall timing and frequency generation of the radio subsystem. This includes control signals for up to two synthesiz- ers, powerdown control signals and power amplifier monitor signals. Detailed information can be found in the ADPLP01 data sheet. Generation of Auxiliary Audio Signals Under control of Layer 1 the ASP can generate a variety of fixed and user-programmable tones. This includes all standard DTMF and Call Progress tones as well as user defined tones. The tone structure can consist of up to four frequency compo- nents with individual durations. The ASP also generates Talker Sidetone as specified in the GSM recommendations. In comparison to traditional hardware implementations, this software implementation provides manu- facturing flexibility over a wide range of speaker/microphone sensitivities. VOLTAGE REFERENCE LOCK AUDIO/AUXILIARY SECTION VOICEBAND SERIAL INTERFACE PGA PGA AUXILIARY SERIAL INTERFACE 10-BIT DAC MUX Σ/∆ DAC FILTER FILTER Σ/∆ DAC PGA MUX CAR KIT U BAT TEMP OTHER Figure 3. Audio-/Auxiliary Section of AD7015 Figure 3 shows the audio section and the auxiliary ADC of the BBC. Input signals can come from either a directly connected microphone or from a remote microphone in a car kit. Input gain can be set to 0 dB or +26 dB. The output signal can be directly connected to a small earpiece and, for further amplifica- tion, to an external car-kit. Two output-PGAs can be pro- grammed for –15 dB or +6 dB. DATA SERVICES Data Services is considered to be an essential feature for GSM terminals and the AD20msp410 chipset is designed to provide flexible and low cost implementation of Data Services supported via the GSM air interface. V110' FRAMES MAN MACHINE INTERFSCE DATA APPLICATION LAYER 2 RELAY (L2R) RADIO LINK PROTOCOL (RLP) RATE ADAPTION EXTERNAL DATA TERMINAL ADAPTER HANDSET APPLICATION LAYER FOREGROUND COMMAND INTERPRETER FRAME ROUTER DATA TERMINAL ADAPTER APPLICATION LAYER BACKGROUND PROTOCOL STACK LAYERS 2/3 PROTOCOL STACK LAYER 1 AD20msp410 CHIPSET Figure 4. Implementation of Data Services The selected system architecture shown in Figure 4 provides for minimum terminal Bill of Materials, the lowest possible number of interconnection points and the lowest power consumption when running speech traffic only. However, the chipset provides full channel coding and decoding for all Data Services. Parity and convolutional encoding and interleaving for TCH/F9.6, TCH/F4.8 and TCH/F2.4 are implemented in the PLP. The interface to the chipset is a user-configurable, 3-wire serial interface supplying V110 data packets as defined in GSM 05.03, combined with protocol information and control to the Applica- tion Layer. External to the terminal is the Data Terminal Adapter (DTA) which runs the Data Services Software. Included in the DTA are the rate adaptation functions and the Data Services application. The Command Interpreter resident on the mobile supports a serial interface protocol with the DTA via both traffic data and control information are communicated. The Technology Partnership can provide all requisite Data Services Software. SOFTWARE IMPLEMENTATIONS A full implementation of the GSM Layer 1 functionality is supplied as an object code module, for execution on the controller, embedded in the PLP. Functions performed by this software include: • Initial scan of GSM band and selection of strongest thirty channels as required by 03.22 and 05.08 • Mobile oscillator adjustment, timing synchronization and BCCH decoding from serving cell (camping-on) • Base station frequency and timing measurements and BSIC extraction from neighbor cells under control of Layer 3 • Frequency hopping according to 05.02 • Full implementation of discontinuous reception (DRX) and transmission (DTX) • Reporting of received level and signal quality |
类似零件编号 - ADPLP01 |
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类似说明 - ADPLP01 |
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