MAX2323

Triple/Dual-Mode CDMA LNA/Mixers

Data Sheet (Rev. 0)

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Part Details

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)

Documentation

Data Sheet 1

MAX2323-MAX2325: Triple/Dual-Mode CDMA LNA/Mixers Data Sheet (Rev.0) 05/10/2002

Technical Articles 3

Silicon Germanium (SiGe) Technology Enhances Radio Front-End Performance 09/02/2002

PCBs Layout Guidelines for RF & Mixed-Signal 09/14/2011

Triple/Dual/Single Mode CDMA LNA/Mixers Receiver System Requirements 09/30/2002

This is the most up-to-date revision of the Data Sheet.

Reference Designs

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

View Detailed Reference Design

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.

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.