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MAX2323

MAX2323

Triple/Dual-Mode CDMA LNA/Mixers

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Overview

Description

The MAX2323/MAX2325 are low-noise amplifier (LNA) plus mixer ICs optimized for code-division multiple-access (CDMA) applications in both cellular and PCS bands. The MAX2323 addresses dual-band, triple-mode CDMA applications by providing switched signal paths for cellular FM, cellular CDMA, and PCS CDMA. The MAX2325 is a cellular-band dual-mode version.

To optimize cellular-band dynamic range at minimum current, the MAX2323/MAX2325 implement four LNA states: high gain/high linearity, high gain/low linearity, midgain, and low gain. In high-gain/high-linearity mode, the adjustable high-intercept LNA minimizes desensitization in the presence of a large interfering signal. For the other gain states, the LNA current is reduced to improve standby time.

The CDMA mixers are designed for high linearity, low noise, and differential IF outputs, while the FM mixer is designed for lower current and single-ended output. Each band is implemented with a separate mixer to optimize performance for the specific band.

The MAX2323/MAX2325 can also be used in TDMA, EDGE, and W-CDMA phones.
MAX2323: Typical Application Circuit MAX2323: Typical Application Circuit Enlarge+

Key Features

  • 2.7V Operation
  • Dual Band, Triple Mode
  • Three LNA Gain Settings (Cellular)
  • Two LNA Gain Settings (PCS)
  • 18mA in Low-Gain Mode
    • 19.5mA in Paging and Midgain Mode
    • 26.5mA in High-Gain, High-Linearity Mode
    • 16.5mA in FM Mode, High-Gain, Low-Linearity Mode
  • 2.5dB (typ) Cascade Noise Figure
  • Adjustable LNA IIP3, +5dBm to +13dBm
  • Ultra-Small 28-Pin Package (5mm x 5mm)

Applications/Uses

  • Dual-Band, Triple-Mode PCS/Cellular Phones
  • Dual-Mode Cellular Phones

Design Resources

Technical Documents

Tutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
App Note 697 Silicon Germanium (SiGe) Technology Enhances Radio Front-End Performance
Reference Schematic 464 REP012: Cellular LNA Achieves +20dBm IIP3 in Low-Gain High-Linearity Mode
Reference Schematic 463 REP019: Tuned Dual-Band Front-End CDMA IC with Single 110MHz IF
Reference Schematic 459 REP020: Dual-Band Dual-Mode FE IC with Common 210MHz IF
Reference Schematic 458 REP021: Front end for 2.5GHz GlobalStar +IS-95
Reference Schematic 457 REP018: Dual-Band Dual-Mode Front-End IC with Common 183.6MHz IF
Reference Schematic 454 REP003: Cellular Front-End IC in Automobile Application
Reference Schematic 443 REP008: Dual-Band Front-End IC Tuned for CDMA, PCS, and AMPS at a Common 85MHz Low IF
App Note 289 Triple/Dual/Single Mode CDMA LNA/Mixers Receiver System Requirements

Quality And Environmental

Request Reliability Report for: MAX2323 
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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Technical Docs

Reference Designs