MAX2323
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MAX2323

Triple/Dual-Mode CDMA LNA/Mixers

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Part Details
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)
Additional Details
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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.

Applications

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

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Software & Part Ecosystem

Software & Part Ecosystem

Reference Designs

Reference Designs 8

repca12q300da2

Cellular LNA Achieves +20dBm IIP3 in Low-Gain High-Linearity Mode

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REP012

Cellular LNA Achieves +20dBm IIP3 in Low-Gain High-Linearity Mode

Cellular LNA Achieves +20dBm IIP3 in Low-Gain High-Linearity Mode

Features and Benefits

Objective: For this dual-band triple-mode front-end IC, to experimentally tune for the best-possible cellular LNA linearity available in CDMA low-gain high-linearity mode.

Objective: For this dual-band triple-mode front-end IC, to experimentally tune for the best-possible cellular LNA linearity available in CDMA low-gain high-linearity mode.

The project requirement was to custom-tune to obtain cellular LNA low-gain high-linearity performance of +20dBm IIP3, as well as to match the analog and the digital (cellular/PCS) mixer output ports both to 85.38MHz IFs. Note that this was a one-time experimental "limits-of-performance" design, which is difficult to achieve routinely. The LNA bias resistor was adjusted carefully along with the IF output matching circuit. The LNA input match was varied as well, but care was taken not to upset the mid-gain and high-gain noise figures. The LNA output match was not varied. It demonstrates the extremely versatile application designs that can be developed using these SiGe FE ICs.

The MAX2323 low-noise amplifier (LNA) plus mixer is designed for dual-band CDMA cellular-phone handsets, but it can also be used in dual-band TDMA, GSM, EDGE, or WCDMA applications. It differs from its predecessor (the MAX2320) by adding a third "mid-gain" state for the cellular-band LNA that improves switchover hysteresis margin. It also comes in a smaller package (28-QFN) and offers increased third-order input intercept.

Rapid Engineering Prototypes are real circuits that Maxim application engineers have built and measured in our labs. They can provide a starting point for new RF designs. They are not available as evaluation kits.

View Detailed Reference Design external link

Part Used 1

Design & Integration Tools

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ZIP

175.74 K

Videos

Thumbnail Image

Oct 04, 2022

04:07

Introduction to the MAX22700D, MAX22701E/D and MAX22702E Ultra-High CMTI Isolated Gate Drivers

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Oct 04, 2022

06:31

Introduction to the MAX77541 5.5VIN/6A, Dual-Phase High-Efficiency Buck Converter

reppc06q300e1

Front end for 2.5GHz GlobalStar +IS-95

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REP021

Front end for 2.5GHz GlobalStar +IS-95

Front end for 2.5GHz GlobalStar +IS-95

Features and Benefits

View Detailed Reference Design external link

Part Used 1

Design & Integration Tools

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ZIP

121.45 K

Videos

Thumbnail Image

Oct 04, 2022

04:07

Introduction to the MAX22700D, MAX22701E/D and MAX22702E Ultra-High CMTI Isolated Gate Drivers

Thumbnail Image

Oct 04, 2022

06:31

Introduction to the MAX77541 5.5VIN/6A, Dual-Phase High-Efficiency Buck Converter

reppc08q3001db1

Dual-Band Dual-Mode FE IC with Common 210MHz IF

repca41q101b1

REP007: Cellular Front-End IC Drives IFR3100 IF Demodulator

rep019

REP019: Tuned Dual-Band Front-End CDMA IC with Single 110MHz IF

443fig01

Dual-Band Front-End IC Tuned for CDMA, PCS, and AMPS at a Common 85MHz Low IF

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REP008

Dual-Band Front-End IC Tuned for CDMA, PCS, and AMPS at a Common 85MHz Low IF

Dual-Band Front-End IC Tuned for CDMA, PCS, and AMPS at a Common 85MHz Low IF

Features and Benefits

View Detailed Reference Design external link

Part Used 1

Design & Integration Tools

pdf icon

ZIP

130.02 K

Videos

Thumbnail Image

Oct 04, 2022

04:07

Introduction to the MAX22700D, MAX22701E/D and MAX22702E Ultra-High CMTI Isolated Gate Drivers

Thumbnail Image

Oct 04, 2022

06:31

Introduction to the MAX77541 5.5VIN/6A, Dual-Phase High-Efficiency Buck Converter

443fig01

Dual-Band Dual-Mode Front-End IC with Common 183.6MHz IF

zoomopens a dialog

REP018

Dual-Band Dual-Mode Front-End IC with Common 183.6MHz IF

Dual-Band Dual-Mode Front-End IC with Common 183.6MHz IF

Features and Benefits

 

View Detailed Reference Design external link

Part Used 1

Design & Integration Tools

pdf icon

ZIP

126.02 K

Videos

Thumbnail Image

Oct 04, 2022

04:07

Introduction to the MAX22700D, MAX22701E/D and MAX22702E Ultra-High CMTI Isolated Gate Drivers

Thumbnail Image

Oct 04, 2022

06:31

Introduction to the MAX77541 5.5VIN/6A, Dual-Phase High-Efficiency Buck Converter

repca12q300da2

Cellular Front-End IC in Automobile Application

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