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| DECT Digital Circuit for Basestations PMB 27251/2 General Description The DECT-Digital Circuit for Basestations is one of the devices of the Siemens chip set for the digital cordless telephone specified by the DECT standard. The device designed for single cordless fixed stations is a highly integrated circuit and realizes most of the system functions needed in such an equipment. The circuit contains a digital signal processor, an 8-bit 80C51-compatible microcontroller and the burst mode controller. Furthermore the circuit handles the interfacing of the different components of the DECT chipset. The device is fabricated using Siemens advanced CMOS technology and wilI be available in a 128 pin package. Type PMB 27251/2 Features * * * * * * * * * * * * Package P-TQFP-128-1 (SMD) 8-bit C with integrated ROM/RAM 32 bit/s ADPCM-transcoder Digital filtering and gain stages Echocancellation Burst mode controller Internal calls possible Power supply voltage: 5 V 5 % Low power consumption Advanced low power CMOS technology Encryption PMB 27251: 6 K RAM PMB 27252: 64 K ROM, 4 K RAM Data Port (32 kbit/s) Crystal 20.736 MHz DSP Clocks Input Data RAM Timers / RF-Interf. Serial In CRC Synchronization Descramble TDMA Data 1.152 Mbit/s Scramble Speech Data (PMB 2920) Interpolation Decimation Codec Filter ADPCM Transcoder Control RAM Internal Switch Output Data RAM Serial Out Control RAM CRC Burst-Error-Concealment Tone Generation Burst Mode Logic Encryption Decryption Power Control Internal ROM 64 KBytes 8-Bit CPU Internal RAM 4 KBytes Port X Keypad Timers Tonedect. Microcontroller Unit Port 0 Addit. I C Bus Interrupts 2 D A Watchdog RSSI ITB08461 Block Diagram PMB 27252 Siemens Aktiengesellschaft 1 |
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