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. 2.7V Operation 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 perf

NOTE 447 REP016: Dual-band front end for Japanese cellular CDMA at 110MHz IF Abstract: This reference design (RD) is for a dual-band, dual-mode CDMA front-end for Japanese cellular CDMA at 110MHz IF. The RD uses a low-noise amplifier (LNA) with mixer, the MAX2325, that is also useful for TDMA, GSM, and EDGE applications. Schematics and bill of materials are shown. More Information - Wireless Home - Application Notes and Tutorials - EV Kit Software - Technical Support 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. Objective: To band-shift the RF matching from the U.S. to the Japanese cellular band, and to measure the performance of this CDMA dual-mode front-end IC. The MAX2325 application circuit was changed from its standard BOM for the U.S. cellular-band LNA and mixer RF matching, to meet the Japanese cellular band wit

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. 2.7V Operation 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 perf

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. 2.7V Operation 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 perf

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. 2.7V Operation 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 perf

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. Additional Information: Wireless Product Line Page Quick View Data Sheet for the MAX2323/MAX2325 Applications Technical Support Objective: To band-shift the RF matching from the U.S. to the Japanese cellular band, and to measure the performance of this CDMA dual-mode front-end IC. The MAX2325 application circuit was changed from its standard BOM for the U.S. cellular-band LNA and mixer RF matching, to meet the Japanese cellular band with 110MHz IF. In addition, measurements were made to ensure compatibility with the end-customer's requirements. The MAX2325's performance was found to be fully compliant to the data sheet specifications at U.S. cellular frequencies. A MAX2323 evaluation kit was used to evaluate the performance of the MAX2325, as it provides a superset of MAX2325 featu

MAX2366 cdmaOne W-CDMA ( 3% * 13 RBIAS ( MAX2367 ) ( MAX2368 ) PCS REF N.C. N.C. TANKH+ TANKHTANKL+ TANKLIFLO VCC SHDN II+ EVM ) IF IP3 LNA+ 25mm2 QFN IC IC ( LNA ) + MAX2323 EDGE CDMA TDMA GSM MAX2320 ( IP3 ) LNA IP3 ( +10dBm +13dBm ) LNA IS-98C MAX2320 MAX2325 MAX2323 * LNA IP3 +13dBm +10dBm * * PCS * <2.6dB ( 17mA * 26dB * IN QF 8-P m 5 m CELLULAR QFN N 2 LNA ) 3dB 28 m x 5m VCC VCC PCS 28 PCS 27 26 25 24 23 22 28 21 1 20 2 27 26 25 24 23 22 VCC 21 1 20 19 2 19 3 18 3 18 4 17 4 17 VCC CDMA IF CELLULAR SLEEP BAND MAX2323 5 VCC CDMA IF SLEEP 16 G2 AMPS IF 15 G1 VCC 6 15 G1 7 8 9 10 11 12 13 7 14 8 9 MODE 10 11 12 13 14 MODE PCS LO VCO CELLULAR LO IP3 MAX2323 VCC 16 G2 VCC 6 MAX2325 5 MAX2325 MAX2323 AMPS IF Maxim RF * * * (V) MAX2640 MAX2641 MAX2642/43 2.7 2.7 2.7 5.5 5.5 5.5 ( mA ) 3.5 3.5 5.3 ( MHz ) 400 1500 1400 2500 800 1000 ( dB ) 15.1 ( 900MHz) 14.4 ( 1900MHz) 16.7 ( 900MHz) IP3 ( dBm ) -10 -4 0 ( dB ) 0.9 1.3 1.3 6 6 6 SOT23 SOT23 SC70 IP3/ 13dB MAX2644 2.7 5.5

best choices: MAX2323/2325/2329. These are LNA/Mixer ICs optimized for CDMA applications in both cellular and PCS bands. The MAX2323 addresses dual-band, triple-mode CDMA applications by providing switched signal paths for cellular CDMA and PCS CDMA. The MAX2325 and MAX2329 are cellular-band dual-mode and PCS-band versions, respectively. This technical note is focused on how to determine the system specification of a CDMA receiver in order to establish a practical specification for a low noise amplifier and down converter. In the second section, the performance and features of MAX2323/25/29 are described in detail. The last section provides details of how to design the receiver front end, including designing matching circuits for RF and IF SAW filters to optimize performance of the receiver. A practical circuit and measurement data are shown in this note as well. RF CDMA Receiver System Requirements and Issues Wireless code division multiple access (CDMA) networks, based upon the IS-95 standard

4 12 13 RBIAS 35 MAX2366 cdmaOnecdma2000CDMA Development Group m 4 36 IFPLL 4 VCC IDLE VCC RFPLL 2 N 1 7 RFL RFH0 LOCK 48 * RFIF PLL IP3SiGe LNA + IC 25mm2 QFNSiGe IC MAX2323CDMA(LNA) +TDMA GSMEDGEMAX23203 3(IP3) LNAIP3+10dBm(+13dBm) 3LNAIS-98C MAX2320 NF MAX2325MAX2323 * +10dBmLNA IIP3 +13dBm * 26dB * PCS< 2.6dB (3dB) * (17mA) * 28QFN * LNA SiGe N 2 QF 8 CELLULAR VCC 5 m PCS 28 PCS 27 26 25 24 23 22 m VCC m x 5m 28 21 27 26 25 24 23 22 VCC 21 1 20 19 2 19 3 18 3 18 4 17 4 17 1 20 2 VCC CDMA IF CDMA IF CELLULAR SLEEP BAND MAX2323 5 VCC SLEEP G2 15 VCC 6 AMPS IF VCC 16 G2 VCC 6 MAX2325 5 16 15 AMPS IF G1 G1 7 8 9 10 11 12 13 14 7 8 9 10 11 12 13 14 MODE MODE PCS LO VCO CELLULAR LO MAX2323IP3 MAX2325MAX2323 4mm2 TDMA PA130* TDMAPA MAX2251 8 2 4 M H z 8 4 9 M Hz T D M A * TDMA30dBm * TDMA41% * AMPS32dBm * AMPS51% * (29dB) ACPR/ALT VCC = 3.3V -20 fIN = 836MHz -25 ACPR ACPR / ALT (dBc) -30 -35 -40 -45 -50 ALT -55 2mmx 2mmMAX2251 80402 -60 20 22 24 26 28 30 32 (dBm) * 100/ 45M

( MAX2367 ) ( MAX2368 ) PCS REF N.C. N.C. TANKH+ TANKHTANKL+ TANKLIFLO VCC SHDN II+ EVM ) IF IP3 LNA+ 25mm2 QFN IC IC ( LNA ) + MAX2323 EDGE CDMA TDMA GSM MAX2320 ( IP3 ) LNA IS-98C +13dBm ) MAX2323 IP3 +10dBm +13dBm * * 26dB * PCS ( 17mA * IP3 ( MAX2320 MAX2325 * LNA +10dBm LNA 5 m CELLULAR m 2 IN QF 8-P N SiGe ) 3dB 28 QFN * LNA <2.6dB m x 5m VCC VCC PCS 28 PCS 27 26 25 24 23 22 28 21 1 20 2 27 26 25 24 23 22 VCC 21 1 20 19 2 19 3 18 3 18 4 17 4 17 VCC CDMA IF CELLULAR SLEEP BAND MAX2323 5 VCC CDMA IF SLEEP 16 G2 AMPS IF 15 G1 VCC 6 15 G1 7 8 9 10 11 12 13 7 14 8 9 MODE 10 11 12 13 14 MODE PCS LO VCO CELLULAR LO IP3 MAX2323 VCC 16 G2 VCC 6 MAX2325 5 MAX2325 MAX2323 AMPS IF $1* 4mm2 TDMA TDMA MAX2251 824MHz * TDMA * AMPS * * 1M 849MHz TDMA >30dBm >32dBm 29dB * TDMA * AMPS 41% 51% / 5 min 12 5 45MHz 650MHz 9 3 6 1: 2: Maxim 3: OUT FROM LOOP FILTER MAX2605-MAX2609 SOT23-6 ( MHz ) MAX2605 MAX2606 MAX2607 OUT ( mA ) 100kHz ( dBc/Hz ) 70 1.9 -117 70 150 2.1 -112 150 300 2.1

98C, meme avec une marge importante. Les autres ameliorations par rapport au MAX2320 comprennent un gain legerement plus eleve pour tous les blocs et un bruit nettement moindre dans le melangeur, ce qui permet d'avoir une meilleure sensibilite globale. Le MAX2325 est concu pour les applications dans la bande de frequence cellulaire. Il est compatible broche a broche avec le MAX2323, offrant ainsi une solution simple de reduction des couts. * Plus de +10dBm de IIP3 pour le LNA (reglable jusqu'a +13dBm) * Nombreux modes pour l'economie de consommation, dont un mode paging a 17mA * LNA a gains commutables 5 m CELLULAR m Q 28 BR FN . SiGe * Plus de 26dB de gain global * Moins 2,6dB de NF globale en bande PCS (incluant la perte d'insertion a 3dB des filtres inter-etages) * Boitier miniature QFN a 28 broches m x 5m VCC VCC PCS 28 PCS 27 26 25 24 23 22 28 21 1 20 2 27 26 25 24 23 22 VCC 21 1 20 19 2 19 3 18 3 18 4 17 4 VCC CDMA IF CELLULAR SLEEP BAND MAX2323 5 VCC CDMA IF G2 MAX2325 5 15 G1

+ IFOUTL- 14 25 13 12 REF N.C. m 8 36 IFPLL 2 4 IFINL+ IFINLIFINH+ IFINHRBIAS RFPLL N 1 7 RFL RFH0 LOCK VCC IDLE VCC TXGATE 48 * RFIFPLL IP3SiGeLNA+IC 25mm2 QFNSiGeIC MAX2323CDMA(LNA) +TDMA GSMEDGEMAX23203 3(IP3) LNAIP3+10dBm(+13dBm) 3LNAIS-98C MAX2320 NF MAX2325MAX2323 * +10dBmLNAIIP3 +13dBm * 26dB * PCS<2.6dB (3dB) * (17mA) * 28QFN * LNA SiGe 5 m VCC m CELLULAR VCC N 2 QF 8 m x 5m PCS 28 PCS 27 26 25 24 23 22 28 21 27 26 25 24 23 22 VCC 21 1 20 19 2 19 3 18 3 18 4 17 4 17 1 20 2 VCC CDMA IF CDMA IF CELLULAR SLEEP BAND MAX2323 5 VCC SLEEP G2 15 VCC 6 AMPS IF VCC 16 G2 VCC 6 MAX2325 5 16 15 AMPS IF G1 G1 7 8 9 10 11 12 13 14 7 8 9 10 11 12 13 14 MODE MODE PCS LO VCO CELLULAR LO MAX2323IP3 MAX2325MAX2323 RF * * I/Q * I 90 Q LNA VCO IF PLL RF R O IFVC CO RFV T I/Q I 90 Q AGC NEW (V) PA SiGe (mA) (MHz) (dB) (dB) IP3 (dBm) 3.5 3.5 5.3 400 ~ 1500 1400 ~ 2500 800 ~ 1000 15.1 (@ 900MHz) 14.4 (@ 1900MHz) 16.7 (@ 900MHz) 0.9 1.3 1.3 -10 -4 0 6SOT23 6SOT23 6SC70 +1.8 6SC70 MAX2640

98C entprechend deren Erfordernissen erreicht werden. Weiterhin wurde im Vergleich zum MAX2320 die Verstarkung aller Blocke etwas erhoht und zugleich die Rauschzahl der Mixer erheblich reduziert, wodurch die Empfindlichkeit insgesamt verbessert wurde. Der MAX2325 wurde fur Anwendungen im Frequenzbereich von Cellular Funktelefonen entwickelt. Er ist kompatibel zum MAX2323 und bietet damit einen optimalen Weg zur Kostensenkung. * Mehr als 26dB Gesamtverstarkung * Kaskadierte PCS-Rauschzahl <2,6dB (einschlielich 3dB Verlust im Zwischenstufenfilter) * Extrem kleines 28-poliges QFNGehause 5 m m SiGe 28-PO N, LIG QF * LNA Eingangs-IP3 >+10dBm, einstellbar bis >+13dBm * Mehrere stromsparende Betriebszustande, einschlielich eines 17mA Paging-Modus * Schaltbare LNA-Verstarkung m x 5m CELLULAR VCC VCC PCS 28 27 26 25 24 23 22 1 PCS 28 21 27 26 25 24 23 22 VCC 21 1 20 19 2 19 3 18 3 18 4 17 4 17 20 VCC CDMA IF 2 CELLULAR SLEEP BAND MAX2323 5 VCC CDMA IF SLEEP 16 G2 VCC 6 MAX2325 5 15 G1 G2 AMPS

tate on the cellular LNA facilitates meeting all IS-98C two-tone specs with high margin. Other improvements over the MAX2320 include slightly higher gain for all blocks and significantly reduced mixer noise figure, yielding overall better sensitivity. The MAX2325 is intended for applications in the cellular frequency band. It is pin compatible with the MAX2323, providing a simple cost-reduction path. * Over +10dBm LNA Input IP3 * Over 26dB Overall Gain Adjustable to over +13dBm * Multiple Power-Saving Modes, Including a 17mA Paging Mode * Switchable LNA Gain * <2.6dB Cascade PCS Noise Figure 5 m CELLULAR m 2 IN QF 8-P N SiGe (Includes 3dB Interstage Filter Loss) * Ultra-Small 28-Pin QFN Package m x 5m VCC VCC PCS 28 PCS 27 26 25 24 23 22 28 21 1 20 2 3 27 26 25 24 23 22 VCC 21 1 20 19 2 19 18 3 18 VCC CDMA IF CELLULAR 4 17 SLEEP BAND MAX2323 5 CDMA IF 4 VCC G2 MAX2325 5 15 G1 AMPS IF VCC 16 G2 VCC 6 17 SLEEP 16 VCC 6 15 AMPS IF G1 7 8 9 10 11 12 13 14 7 8 9 MODE 10 11 12 13 14 MODE P

98C, meme avec une marge importante. Les autres ameliorations par rapport au MAX2320 comprennent un gain legerement plus eleve pour tous les blocs et un bruit nettement moindre dans le melangeur, ce qui permet d'avoir une meilleure sensibilite globale. Le MAX2325 est concu pour les applications dans la bande de frequence cellulaire. Il est compatible broche-a-broche avec le MAX2323, offrant ainsi une solution simple de reduction des couts. * Plus de 26dB de gain global * Moins de 2,6dB de bruit NF global en bande PCS (incluant la perte d'insertion a 3dB des filtres inter-etages) * Boitier miniature QFN a 28 broches * Plus de +10dBm de IIP3 pour le LNA (reglable jusqu'a >+13dBm) * Nombreux modes pour l'economie de consommation, dont un mode paging a 17mA * LNA a gains commutables m Q 5 m CELLULAR . SiGe 28 FN br m x 5m VCC VCC PCS 28 PCS 27 26 25 24 23 22 28 21 1 20 2 3 27 26 25 24 23 22 VCC 21 1 20 19 2 19 18 3 18 VCC CDMA IF CELLULAR 4 17 SLEEP BAND MAX2323 5 CDMA IF 4 VCC G2 MAX2325

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