GPS/GNSS Front-End Amplifier

The MAX2670 GPS/GNSS front-end amplifier IC is designed for automotive and marine GPS/GNSS satellite navigation antenna modules or for any application that needs to compensate for cable losses from the antenna to receiver. Two unconditionally stable low-noise amplifier stages provide the high gain and integrated I/O matching to minimize the need for external matching components and eliminate the need for additional gain stages. The device features the option to place a bandpass ceramic or SAW filter between the two amplifier stages to provide a narrow-band output to further improve the noise performance of the GPS/GNSS receiver. Additionally, a 3.4dB gain step is provided to compensate for cable loss variation between different applications.

The device is designed to operate across all GNSS frequency standards with a 34.8dB typical cascaded gain and a 25mA supply current. The two LNA stages allow the use of a wide range of GNSS filter types for maximum flexibility in system design. The final RF output pin, which drives the cable to the GNSS receiver, is also the power-supply connection that accepts a DC supply in the +3.0V to +5.5V range. Alternatively, the DC supply can be applied to pin 4.

This GPS/GNSS front-end amplifier is designed on a low-noise, advanced SiGe process and is available in a lead-free, 10-pin TDFN surface-mount package (3mm x 3mm).

Applications

* Active Antennas * Integrated Automotive and Marine GPS Receivers

* First Amplifier Noise Figure*: 1.0dB

* High Gain**: 34.8dB

* 3.4dB Gain Step

* Shared VCC and RFOUT2 Pin

* Integrated 50Ω Output Matching

* 3.0V to 5.5V Supply Voltage Range

* Small, Low-Cost Package (3mm x 3mm)

* AEC-Q100 Qualified

* ESD Protected to ±2kV Human Body Model