Triple/Dual-Mode CDMA LNA/Mixers
DescriptionThe 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.
- 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)
- Dual-Band, Triple-Mode PCS/Cellular Phones
- Dual-Mode Cellular Phones
Technical DocumentsTutorial 5100 General Layout Guidelines for RF and Mixed-Signal PCBs
Tutorial 4651 Web Seminar: Wireless Technology Tutorial
Reference Schematic 447 REP016: Dual-Band Front End for Japanese Cellular CDMA at 110MHz IF
|Device||Fab Process||Technology||Sample size||Rejects||FIT at 25°C||FIT at 55°C||Material Composition|
- 925MHz to 2175MHz Frequency Range
- Monolithic VCO
- High Dynamic Range: -75dBm to 0dBm
|Tutorial||5100||General Layout Guidelines for RF and Mixed-Signal PCBs|
|Tutorial||4651||Web Seminar: Wireless Technology Tutorial|
|Reference Schematic||447||REP016: Dual-Band Front End for Japanese Cellular CDMA at 110MHz IF|