The MAX2745 complete single-chip global positioning system (GPS) RF front-end downconverter utilizes many innovative and leading-edge RF CMOS design techniques. This high-performance, state-of-the-art device consumes extremely low power and eliminates the need for costly SAW and bulky discrete IF filters. The MAX2745 incorporates a fully integrated low-noise amplifier (LNA), IF section, digital sampler, and local oscillator synthesizer. The MAX2745 implements power-down control for an external LNA as well as active antenna detection. In addition, the MAX2745 features a voltage booster, which can extend the power-supply voltage to as low as 1.6V.
The MAX2745 supports both 3rd overtone crystal designs in 32MHz and fundamental frequency crystal designs in 16MHz, as well as TCXO implementation. In addition, the MAX2745 incorporates an on-chip temperature sensor and voltage-controlled oscillator (VCO) with trimmed capacitors, resulting in a very accurate frequency and additional system cost savings.
The MAX2745 is available in a space-saving 48-pin TQFP package and is specified for the extended (-40°C to +85°C) temperature range. The power consumption of this device is as low as 41mW at 2.4V.
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