GENERAL DESCRIPTION
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.

FEATURES
• Complete single-chip programmable double-superheterodyne C/A-code GPS receiver
• Programmable high IF frequencies supporting wideband/P-code GPS and Global Navigation Satellite System (GLONASS) applications
• Supports frequency plans with a 2nd IF of 4 × f0(1.023 MHz) = 4.092 MHz
• 48-pin LQFP package
• −40 to +85 °C operating temperature range
• 2.7 V minimum supply voltage
• Low DC power consumption [57 mA typical with both Low-Noise Amplifiers (LNAs) active]
• Power-down mode (<900 µA)
• Typical receiver noise figure at 1.57542 GHz: 4.5 dB
• Typical phase noise −72 dBc/Hz at 10 kHz offset
• Simple microstrip LNA1/2 and first mixer matching
• Single pin VCO with external varactor and resonator
• Digital Phase Locked Loop (DPLL) synthesizer with programmable VCO, 2nd Local Oscillator (LO) and reference dividers
• 3-bit synthesizer and power-down control input
• Reference and independent sample clock input with internal squaring
• 1-bit amplitude quantized and time sampled TTL/CMOS compatible output driver
• High active gain supporting SAW filter applications
• Configurable for external first LNA applications.