Global Positioning System Gps Front-end Receiver Circuit

The UAA1570HL is a complete single-chip double-superheterodyne receiver front-end intended for GPs and GLONASS navigation systems. The IC includes a programmable on-chip DPLL synthesizer, VCO with external varactor and Resonator a 1-bit amplitude quantizer and a time sampled TTL/CMOS compatible SIGN output bit driver. It CAN be used with either an active or passive Antenna system by disabling or enabling the on-chip LNAs and is ideally suited for low power GPs receiver applications because of its 3 V supply and the Power Management features through control pins. Programmable prescaler controls provide the flexibility of using different frequency schemes. The UAA1570HL is optimized to provide SIGN bit data to the companion Philips part, the SAA1575HL baseband digital signal processor. The SAA1575HL CAN provide the sample Clock input to the UAA1570HL by dividing a TTL/CMOS level reference Clock signal down to a programmable sampling Clock output frequency. Both ICs CAN also be used independently. The UAA1570HL is supplied in a low profile, 48-pin LQFP package for excellent Radio Frequency (RF) performance and small size. By NXP Semiconductors