The MAX2745 is a complete single-chip global positioning system (GPS) RF front-end downconverter that incorporates many innovative and leading-edge RF CMOS design techniques. It is a high-performance device with low power consumption, eliminating the need for costly SAW and bulky discrete IF filters. The MAX2745 includes a fully integrated low-noise amplifier (LNA) and mixer, IF section, digital sampler, and local oscillator synthesizer. It also provides a voltage supply for an external LNA and features a voltage booster that can extend the power-supply voltage to as low as 1.6V. The MAX2745 supports both 32MHz 3rd overtone crystal designs and 16MHz fundamental frequency crystal designs, as well as TCXO implementation. Additionally, it incorporates an on-chip temperature sensor and crystal oscillator with trimmed capacitors for accurate frequency and 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 device consumes as low as 41mW power at 2.4V.
The MAX2745 is a complete single‑chip GPS RF front‑end downconverter that integrates a low‑noise amplifier, mixer, IF section, digital sampler, local‑oscillator synthesizer, voltage booster and on‑chip temperature sensor. It operates from 2.4 V to 3.6 V and consumes as little as 41 mW at 2.4 V, making it suitable for low‑power navigation applications.
Key features include a 48‑pin TQFP package, an operating temperature range of –40 °C to +85 °C, a typical noise figure of 3.5 dB, maximum conversion gain up to 120 dB, and an IF output at 4.092 MHz. The device supports both 16.368 MHz and 32.736 MHz crystal designs and provides external LNA supply and voltage‑boost capability down to 1.6 V.
| Supply Voltage Range | 2.4 V to 3.6 V |
|---|---|
| Power Consumption (typical) | 41 mW at 2.4 V |
| Operating Temperature Range | -40 °C to +85 °C |
| Package | 48‑pin TQFP |
| Noise Figure | 3.5 dB |
| Input Frequency | 1575.42 MHz |
| Output IF Frequency | 4.092 MHz |
| LNA/Mixer Gain | 20 dB |
| Voltage Booster Output Current | up to 25 mA |
The device operates from –40 °C to +85 °C.
Typical power consumption is 41 mW at 2.4 V.
It supports an operational supply voltage from 2.4 V to 3.6 V.
Yes, the MAX2745 integrates an on‑chip temperature sensor.