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27251/2 General Description DECT-Digital Circuit Basestations dev


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DECT Digital Circuit Basestations
27251/2
General Description DECT-Digital Circuit Basestations devices Siemens chip digital cordless telephone specified DECT standard. device designed single cordless fixed stations highly integrated circuit realizes most system functions needed such equipment. circuit contains digital signal processor, 8-bit 80C51-compatible microcontroller burst mode controller. Furthermore circuit handles interfacing different components DECT chipset. device fabricated using Siemens advanced CMOS technology wilI available package.
Type 27251/2 Features
Package P-TQFP-128-1 (SMD)
8-bit with integrated ROM/RAM bit/s ADPCM-transcoder Digital filtering gain stages Echocancellation Burst mode controller Internal calls possible Power supply voltage: power consumption Advanced power CMOS technology Encryption 27251: 27252: ROM,
Data Port kbit/s)
Crystal 20.736
Clocks Input Data
Timers RF-Interf. Serial
Synchronization Descramble TDMA Data 1.152 Mbit/s Scramble
Speech Data (PMB 2920)
Interpolation Decimation
Codec Filter
ADPCM Transcoder
Control Internal Switch
Output Data Serial Control
Burst-Error-Concealment Tone Generation
Burst Mode Logic
Encryption Decryption Power Control
Internal KBytes 8-Bit Internal KBytes
Port Keypad Timers Tonedect. Microcontroller Unit
Port Addit. Interrupts
Watchdog
RSSI
ITB08461
Block Diagram 27252
Siemens Aktiengesellschaft

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