Samsung SPR5100D free download

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12. Schematic Description and Diagram 1. CIRCUIT DESCRIPTIONS OF HANDSET RF 1-1 INTRODUCTION The system uses the T.D.D.method that the system receives RX signals and transmits TX signals through only one antenna and carrier frequency. The system also uses the TDMA method using one slot among24slots. The frequency range of TX and RX is from 1881.792MHz to 1897.344MHz. The equipment uses DECT RF module. 1-2 DESCRIPTION 1) ANTENNA The system uses the antenna of ·О herical type to communicate with the microwave signal. /4 2) RF module The operating voltage of this module is 3.6Vdc normally and supplied by BATT directly. The clock of module uses 13.824MHz. The outgoing siginals of module are SLICE OUT, DEMODE OUT,VCC REFand RSSI siginal. This RF module°Ш pin assignments are as follows. s : 9 and 10 are TX POWER SUPPLY. 28 is the supply voltage for other circuits within RF Module. B) GND : 1,3,5,6,7,15,30,31 and 32. C) TX PA RAMP : It controls transmit power AMP.(pin number : 8) In case of H°± ° state, it turns on the TX power AMP. In case of L°± ° state, it turns off the TX power AMP. Its pin number is 5 D) SLICE OUT The reference voltage of data comparator (pin number : 16). In case of H°± ° state, it holds reference voltage. In case of L°± ° state, it is S-field tracking mode. E) DEMODE OUT : This pin presents demodulated signal (pin number : 18). F) SLICE CTRL : It controls the tracking or holding of data slice (pin number :17). In case of H°± ° state, it keeps data slice. In case of L°± ° state, it is tracking mode. G) PLL CTRL : This pin controls PLL power (pin number : 20). This pin is active L°± tate. ° s H) PLL ENABLE : This pin is synthesizer enable input(pin number : 21). I) BATT. SAVE : This controls the main power of RF module (pin number : 25). In case of H°± s ° state, the RF module°Ш power is supplied. J) PLL DATA : This is synthesizer data input pin binary (pin number : 22). K) TX ENABLE : This controls the power of transimitting circuit(pin number :13). In case of L°± the power is to supply TX circuit. ° , L) PLL CLOCK : This is synthesizer clock input for serial registers(pin number :23). M) RX ENABLE : This controls RX path and antenna switch(pin number : 14). In case of L°± the RX path turn on. ° , N) VCO BND S/W : This is the input of VCO band switch (pin number : 27). In case of H°±it selects transmitting ferquency. ° , In case of L°±it selects receiving frequency. ° , O) VCC REF : This is 2.9Vdc reference output for BMC interface (pin number : 29). P) TX DATA : This is transmit data input(pin number : 26). When it is not active this pin goes to high impedance state Q) SYS CLOCK : This is RF module clock input pin(pin number : 24) and its frequency is 13.824MHz. R) RSSI : This is RSSI output pin(pin number : 19) and its voltage level is related to signal level. A) Vcc 48 Samsung Electronics Schematic Description and Diagrams 2. CIRCUIT DESCRIPTIONS OF HANDSET LOGIC 2-1 INTRODUCTION The HANDSET LOGIC B°Ш controls its