MAX2745

19-3425; Rev 0; 10/04 KIT ATION EVALU LE B A IL A AV www.DataSheet4U.com Single-Chip Global Positioning System Receiver Front-End General Description Features o Complete Single-Chip GPS Radio for 16.368MHz and 32.736MHz Floorplans o Single-Ended or Differential Outputs at 4.092MHz o Low 3.5dB Typical Noise Figure o No External IF SAW or Discrete Filters Required o On-Chip Temperature Sensor o 2.4V to 3.6V Operational Supply Voltage Range o Power Consumption as Low as 41mW at 2.4V o Wide -40°C to +85°C Operational Temperature Range MAX2745 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) and mixer, IF section, digital sampler, and local oscillator synthesizer. The MAX2745 also provides a voltage supply for an external LNA. 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 a TCXO implementation. In addition, the MAX2745 incorporates an on-chip temperature sensor and crystal oscillator with trimmed capacitors, resulting in a very accurate frequency and additional s...