LNAs with Step Attenuator and VGA

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The MAX2371/MAX2373 wideband low-noise amplifier (LNA) ICs are designed for direct conversion receiver (DCR) or very low intermediate frequency (VLIF) receiver applications. They contain single-channel, single-ended LNAs with switchable attenuator and automatic gain control (AGC) intended as a low-noise gain stage. These devices provide high gain-control range (typically 60dB) at radio frequency (RF) with excellent noise and reverse isolation characteristics.

The MAX2371/MAX2373 can work over the frequency range from 100MHz to 1GHz. In practice, only a narrow band is needed in each application, so different matching circuits can be applied. The devices are dynamically configured through the digital/analog control pins to select either maximum gain and low noise figure or power-saving mode. In addition, the MAX2371/MAX2373 feature high/low-current modes, high/low attenuation modes, linearly controlled gain states, and shutdown mode.
MAX2371, MAX2373: Typical Operating Circuit MAX2371, MAX2373: Typical Operating Circuit Enlarge+

Key Features

  • Low Noise Figure (1.8dB typical)
  • High Small-Signal Gain (15dB Nominal)
  • Wide Frequency Range of Operation (100MHz to 1GHz)
  • 20dB Step Attenuator
  • 45dB AGC Range Excluding Step Attenuator
  • 2.65V to 3.3V Single-Supply Operation
  • Shutdown Mode
  • 3.5mA Supply Current, Adjustable Down to 2.5mA
  • 40dB Reverse Isolation
  • Applications/Uses

    • Direct Conversion Receiver (DCR)
    • Very Low IF Receiver

    See parametric specs for Low-Noise Amplifiers (42)

    Part NumberRF Freq.
    RF Freq.
    Noise Figure
    Input IP3
    (mm x mm)
    minmaxSee Notes
    MAX2371 10010001.815-413.52.5 to 3.53.0 x 3.0
    $1.90 @1k
    MAX2373 -914.5
    $1.97 @1k

    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.

    MAX2371EVKIT: Evaluation Kit for the MAX2371, MAX2373
    MAX2373EVKIT: Evaluation Kit for the MAX2371, MAX2373

    Technical Documents

    Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
    Product Reliability Reports: MAX2373.pdf 
    Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C   Material Composition  

    Note : The failure rates are summarized by technology and mapped to the associated material part numbers. The failure rates are highly dependent on the number of units tested.

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