Overview

Features and Benefits

  • 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.

Product Details

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

Product Categories

Product Lifecycle icon-recommended Production

At least one model within this product family is in production and available for purchase. The product is appropriate for new designs but newer alternatives may exist.

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ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well.  "Zero defects" for shipped products is always our goal.

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