U2760B

U2760B CT2-RX/TX IC Description The IC for digital cordless telephone application is fabricated using TEMIC’s most advanced UHF process. It covers the CT2 band (864 MHz to 868 MHz) as well as the CT2 Plus band (up to 952 MHz). The RX/TX circuit provides the down conversion to the data stream and the up conversion from the first IF. In conjunction with TEMIC’s RF front end, Twin PLL, I/Q modulator and AMDs CT2 PhoXTM controller AM 79C4xx a complete CT2 IC kit is available. Electrostatic sensitive device. Observe precautions for handling. Features D Low supply voltage 2.9 V typical (min. 2.7 V) D Provides down conversion to the data stream, D D D D D D D up conversion from the first IF Integrated UHF and VHF VCOs Low noise figure of RX path (NF 10 dB) RX and TX power down First IF filter used for transmit as well receive mode Temperature compensated logarithmic Receiver Signal Strength Indicator (RSSI) with a 75 dB dynamic range Low power consumption in RX and TX mode (<20 mA typ.) SSO28 plastic package Benefits D Low power consumption results in extended talk time D Few external components and very small package save space v Block Diagram (Simplified Schematic) MX1/3 MX1/3 MX2/4 MX2/4 outp outn in nin RX enable MX1 in VCO1 ref VCO1 tank VCO1 out MX4 outn MX4 outp TX enable 26 15 21 7 6 5 22 23 24 9 VCC vco/lf 8 GND vco/lf 3 MX3 in 17 18 16 10 RXdata MX4 MX3 COMP VCO1 VCO2 DEMOD MX1 MX2 LIMIT RSSI 27 RSSI out 25 1 2 MX2 out 28 LIMIT in VCC 4 20 GND 19 10 pF 11 12 QUAD DE...