Analog Devices / Maxim Integrated MAX2678 GPS/GNSS Front-End Amplifier IC
Analog Devices MAX2678 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 the receiver. Two unconditionally stable low-noise amplifier stages provide the high gain and integrated I/O matching. These stages minimize the need for external matching components and eliminate the need for additional gain stages.
The Analog Devices MAX2678 features the option to place a bandpass ceramic or surface acoustic wave (SAW) filter between the two amplifier stages for improved immunity to out-of-band interferers. A 3.4dB-gain step is also provided to compensate for cable loss variation between different applications.
The device is designed to operate across all GNSS frequency standards with a 35dB 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 5.25V range. Alternatively, the DC supply can be applied to pin 4.
This GPS/GNSS Front-End Amplifier is available in a lead-free, 10-pin TDFN surface-mount package (3mm x 3mm). Electrical performance is guaranteed over the extended
-40°C to +105°C temperature range.
Features
- First Amplifier Noise Figure: 0.9dB
- High Gain: 35dB*
- 3.4dB Gain Step
- Shared VCC and RFOUT2 Pin
- Integrated 50Ω Output Matching
- AMP 2 includes 50Ω Input Matching
- 3.0V to 5.25V Supply Voltage Range
- AEC-Q100 Qualified
- ESD Protected to ±2kV Human Body Model
- -40°C to +105°C Ambient Temperature Range
- Small (3mm x 3mm) Low-Cost Package
- RoHS Compliant
* First amplifier input is impedance matched (S11 = -10dB). The second amplifier is set to high gain. Amplifiers are cascaded without an interstage filter.
Applications
- Active Antennas
- Integrated Automotive and Marine GPS Receivers
Functional Diagram
Development Tools
Analog Devices / Maxim Integrated MAX2678EVKIT Evaluation Kit
Platform for straightforward evaluation of the MAX2678, a two-stage high-performance GPS LNA.