MAX2424

900MHz Image-Reject Receivers with Transmit Mixer


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Description

The MAX2424/MAX2426 highly integrated front-end ICs provide the lowest cost solution for cordless and ISM-band radios operating in the 900MHz band. Both devices incorporate a receive image-reject mixer (to reduce filter cost) as well as a versatile transmit mixer. The devices operate from a +2.7V to +4.8V single power supply, allowing direct connection to a 3-cell battery stack.

The receive path incorporates an adjustable-gain LNA and an image-reject downconverter with 35dB image suppression. These features yield excellent combined downconverter noise figure (4dB) and high linearity with an input third-order intercept point (IIP3) of up to +2dBm.

The transmitter consists of a double-balanced mixer and a power amplifier (PA) predriver that produces up to 0dBm (in some applications serving as the final power stage). It can be used in a variety of configurations, including BPSK modulation, direct VCO modulation, and transmitter upconversion. For devices featuring transmit as well as receive image rejection, refer to the MAX2420/MAX2421/MAX2422/MAX2460/MAX2463 data sheet.

The MAX2424/MAX2426 have an on-chip local oscillator (LO), requiring only an external varactor-tuned LC tank for operation. The integrated divide-by-64/65 dual-modulus prescaler can also be set to a direct mode, in which it acts as an LO buffer amplifier. Four separate power-down inputs can be used for system power management, including a 0.5µA shutdown mode.

The MAX2424/MAX2426 come in a 28-pin SSOP package.

Key Features

  • Receive Mixer with 35dB Image Rejection
  • Adjustable-Gain LNA
  • Up to +2dBm Combined Receiver Input IP3
  • 4dB Combined Receiver Noise Figure
  • Optimized for Common Receiver IF Frequencies:
    • 10.7MHz (MAX2424)
    • 70MHz (MAX2426)
  • PA Predriver Provides up to 0dBm
  • Low Current Consumption:
    • 23mA Receive
    • 20mA Transmit
    • 9.5mA Oscillator
  • 0.5µA Shutdown Mode
  • Operates from Single +2.7V to +4.8V Supply

Applications/Uses

  • Cordless Phones
  • Spread-Spectrum Communications
  • Two-Way Paging
  • Wireless Networks
  • Wireless Telemetry

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs

Quality and Environmental Data

Request Reliability Report for: MAX2424 
Lead-Free Package Tin (Sn) Whisker Reports
Device   Fab Process   Technology   Sample size   Rejects   FIT at 25°C   FIT at 55°C  

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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