NEW ULTRA-LINEAR SiGe DUAL-BAND RECEIVE FRONT-END IC FOR CELLULAR PHONES
SUNNYVALE, CA—June 6, 2000—Maxim Integrated Products announces the MAX2323 ultra-linear dual-band/triple-mode receive front-end IC. This device is designed for dual-band, tri-mode IS-98A/B/C-based CDMA cellular phones, but it can also be used in TDMA, GSM, or W-CDMA phones. It includes all circuitry needed from the antenna to the IF filter in a miniature package measuring only 5mm x 5mm. It typically replaces discrete designs comprised of GaAs MESFET and silicon devices.
The MAX2323 is Maxim's second generation IC meeting the stringent requirements of narrowband dual-band CDMA phones. The low-noise amplifiers have unprecedented input IP3 (+10dBm) to overcome even the most difficult receive-band noise-leakage problems common in today's miniature phones. The mixers have very high gain (>13dB) essential to meet sensitivity goals. Cascade noise figure, including interstage filter loss, is 2.3dB in the cellular frequency band and 2.5dB in the PCS frequency band.
Both LNAs have switched gain states to conserve power and increase dynamic range. The low-band (cellular-band) LNA has three gain states for optimum IP3 margin in IS-98-based CDMA systems. The average current consumption in a typical system is well under 20mA.
The MAX2325 is a cellular-band-only version of the MAX2323 that eliminates the PCS path. It is pin compatible with the MAX2323 and, therefore, provides a low-effort cost-reduction path when only single-band functionality is required.
The MAX2323/MAX2325 come in a 28-pin 5mm x 5mm QFN package and require very few external components. Compared to a discrete design, cost and implementation size are dramatically reduced. Prices start at $2.71 (1000-up, FOB USA).
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