MAX2386

CDMA + GPS LNA/Mixers


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Description

The MAX2385/MAX2386 LNA/mixer ICs are designed for CDMA/cdma2000® 1x and GPS applications. The MAX2385/MAX2386 are optimized for the Japanese 832MHz to 870MHz band, and can also be configured for the Korean/Chinese/U.S. 869MHz to 894MHz band.

To optimize linearity and current consumption, the CDMA LNA comprises four gain states. The high-gain LNA has a reduced supply-current mode for use when no transmit (Tx) signal is present, and a high linearity mode, which minimizes Tx cross-modulation in the presence of a large interfering signal during talk mode. Two low-gain modes, provide higher cascade IIP3 at lower current. The lowest gain setting provides an LNA bypass and an ultra-low chip current of 4mA. This significantly extends the phone's standby time and lowers the overall current consumption of the phone.

Gain-switching hysteresis can be adjusted by selection of an off-chip resistor, which sets the current and linearity in each mode to customize switchover points.

In GPS mode, the MAX2386 LNA offers high gain and the MAX2385 features lower current consumption with lower gain. The CDMA paths of the MAX2385/MAX2386 are identical.

The MAX2385/MAX2386 include an on-chip LO divider, which enables the use of one VCO module for both cellular and GPS modes. An on-chip LO buffer to drive the Tx upconverter further reduces system complexity.
MAX2385, MAX2386: Typical Operating Circuit MAX2385, MAX2386: Typical Operating Circuit Enlarge+

Key Features

  • Low Average Current Consumption: 4.5mA (CDMA)
  • +2.7V to +3.6V Operation
  • 2.0dB Cascade GPS Noise Figure
  • 2.5dB Cascade CDMA Noise Figure
  • Adjustable IIP3
  • LO Output Buffer to Drive Tx Upconverter
  • 1µA Shutdown Current
  • Tiny 2.1mm x 2.7mm Chip-Scale Package (UCSP™)
  • Single VCO for GPS and CDMA Operation
  • LO Divider Improves Phase Noise/Desensitization
  • Applications/Uses

    • CDMA/cdma2000® 1x Cellular Phones with GPS

    Technical Documents

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

    Quality and Environmental Data

    Request Reliability Report for: MAX2386 
    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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