MAX2678

PRODUCTION

GPS/GNSS Front-End Amplifier

Dual-Stage, Low-Noise Amplifier Solution Includes Gain-Step Control

Data Sheet (Rev. 1) Product Selection Table
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Overview

  • 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
  • Small (3mm × 3mm) Low-Cost Package
  • AEC-Q100 Qualified
  • ESD Protected to ±2kV Human Body Model
  • -40°C to +105°C Ambient Temperature Range

*First amplifier input is impedance matched (S11 = -10dB).
Second amplifier is set to high gain. Amplifiers are cascaded without interstage filter.

The 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 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 IC 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. 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 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 × 3mm). Electrical performance is guaranteed over the extended -40°C to +105°C temperature range.

Applications

  • Active Antennas
  • Integrated Automotive and Marine GPS Receivers
MAX2678
GPS/GNSS Front-End Amplifier
MAX2678: Functional Diagram
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Documentation

Data Sheet 1

Application Note 2

Evaluation Design File 1

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Software Resources

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Evaluation Kits

MAX2678EVKIT

Evaluation Kit for the MAX2678

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Features and Benefits

  • Flexible Evaluation of the MAX2678 IC
    • Stand-Alone AMP 1 or AMP 2 Configuration
    • Cascade Configuration with Interstage SAW Filter*
  • Optimal Matching and Coupling Eliminates Tuning
  • All Ports Matched to 50Ω and Accessible through SMA Connectors for Simple Interfacing
  • Proven PCB Layout
  • Fully Assembled and Tested

*SAW filter not included.

Product Details

The MAX2678 evaluation kit (EV kit) is an easy-to-use platform that enables straightforward evaluation of the MAX2678 two-stage high-performance GPS LNA, which is designed for use in demanding automotive applications and provides 35dB gain. The EV kit includes all functionality that would typically be found in a typical remote antenna module, with the exception of a 12V regulator. Optimal matching and coupling circuits are included on the EV kit, enabling “plug and play” operation. In many applications, an interstage SAW filter is used to maximize immunity to out-of-band interferers. A pair of common SAW filter footprints are available to enable evaluation in this configuration. Resistor options are provided to enable stand-alone testing of either gain stage or cascade testing of the two gain stages and optional SAW filter. Interfacing the MAX2678 EV kit to RF test equipment is streamlined using industry-standard SMA connectors.

Applications

  • Active Antennas
  • Integrated Automotive and Marine GPS Receivers
MAX2678EVKIT
Evaluation Kit for the MAX2678

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