MAX2678

GPS/GNSS Front-End Amplifier

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


Description

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.
MAX2678: Functional Diagram MAX2678: Functional Diagram Enlarge+

Key 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
  • 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.

Applications/Uses

  • Active Antennas
  • Integrated Automotive and Marine GPS Receivers
Part Number RF Freq.
(MHz)
RF Freq.
(MHz)
Noise Figure
(dB)
Gain
(dB)
Input IP3
(dBm)
ISUPPLY
(mA)
Footprint
(mm x mm)
Package/Pins Budgetary
Price
min max See Notes
MAX2678 NEW! 1575 1575 1 34.8 -12 25 3.0 x 3.0
TDFN/10
$1.20 @1k
See All Low-Noise Amplifiers (43)
Pricing Notes:
This pricing is BUDGETARY, for comparing similar parts. Prices are in U.S. dollars and subject to change. Quantity pricing may vary substantially and international prices may differ due to local duties, taxes, fees, and exchange rates. For volume-specific and version-specific prices and delivery, please see the price and availability page or contact an authorized distributor.


MAX2678EVKIT: Evaluation Kit for the MAX2678

Quality and Environmental Data

Request Reliability Report for: MAX2678 
Lead-Free Package Tin (Sn) Whisker Reports

Additional Resources

Topmark Coding MAX2678

Related Resources


MAX2678
GPS/GNSS Front-End Amplifier

  • First Amplifier Noise Figure: 0.9dB
  • High Gain:* 35dB
  • 3.4dB Gain Step

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

MAX2175
RF to Bits Automotive Radio Tuner

  • RF to Bits Architecture with I2S Output
  • Single Supply Voltage of +3.3V
  • Integrated VHF Band-III Loop-Through

MAX2769C
Universal GNSS Receiver

  • GPS/GLONASS/Galileo/BeiDou Systems
  • Dual-Input Selectable LNA for Separate Passive and Active Antenna Inputs
  • 1.4dB Cascaded Noise Figure and 110dB of Cascaded Gain with Gain Control Range of 59dB From PGA