19-2205; Rev 0; 10/01 KIT ATION EVALU E L B AVAILA CDMA + GPS LNA/Mixers In GPS mode, the MAX2386 LNA offers high gain and the MAX2385 features lower current consumption with lower gain. The CDMA paths of the MAX2385/MAX2386 are identical. Features ♦ Low Average Current Consumption: 4.5mA (CDMA) ♦ +2.7V to +3.6V Operation ♦ 2.0dB Cascade GPS Noise Figure ♦ 2.5 dB Cascade CDMA Noise Figure ♦ Adjustable IIP3 ♦ LO Output Buffer to Drive Tx Upconverter ♦ 1µA Shutdown Current ♦ Tiny 2.1mm ✕ 2.7mm Chip-Scale Package (UCSP™) ♦ Single VCO for GPS and CDMA Operation ♦ LO Divider Improves Phase Noise/Desensitization Ordering Information PART TEMP. RANGE BUMP-PACKAGE MAX2385EBP-T -40°C to +85°C 5 ✕ 4 UCSP* MAX2386EBP-T -40°C to +85°C 5 ✕ 4 UCSP* The MAX2385/MAX2386 include an on-chip LO divider, which enables the use of one VCO module for both cellular and GPS modes. An on-chip LO buffer to drive the Tx upconverter further reduces system complexity. *Requires a special solder temperature profile described in the Absolute Maximum Ratings section. Applications Block Diagram CDMA/cdma2000 1x Cellular Phones with GPS GPS PATH MAX2385 MAX2386 Pin Configuration/Functional Diagram/Typical Operating Circuit appears at end of data sheet. CDMA PATH ÷2 LO BUFFER OUTPUT LO BUFFER ENABLE UCSP is a trademark of Maxim Products, Inc. VCO ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX2385/MAX2386 General Description The MAX2385/MAX2386 LNA/mixer ICs are designed for CDMA/cdma2000 1x and GPS applications. The MAX2385/MAX2386 are optimized for the Japanese 832MHz to 870MHz band, and can also be configured for the Korean/Chinese/U.S. 869MHz to 894MHz band. To optimize linearity and current consumption, the CDMA LNA comprises four gain states. The high-gain LNA has a reduced supply-current mode for use when no transmit (Tx) signal is present, and a high linearity mode, which minimizes Tx cross-modulation in the presence of a large interfering signal during talk mode. Two low-gain modes, provide higher cascade IIP3 at lower current. The lowest gain setting provides an LNA bypass and an ultra-low chip current of 4mA. This significantly extends the phone’s standby time and lowers the overall current consumption of the phone. Gain-switching hysteresis can be adjusted by selection of an off-chip resistor, which sets the current and linearity in each mode to customize switchover points. MAX2385/MAX2386 CDMA + GPS LNA/Mixers ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +4.3V Digital Input Voltage to GND ........................-0.3V to VCC + 0.3V RF Input Power ...............................................................+12dBm Digital Input Current .........................................................±10mA Continuous Power Dissipation 5 ✕ 4 UCSP (TA = +70°C, derate 1.2mW/°C above TA = +70°C) .................................................................995mW Thermal Resistance from Junction to Ambient ..............+80°C/W Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +150°C Bump Temperature (Soldering) (Note 1) Infrared (15s) ...............................................................+220°C Vapor Phase (60s) .......................................................+215°C Note 1: This device is constructed using a unique set of packaging techniques that impose a limit on the thermal profile the device can be exposed to during board level solder attach and rework. This limit permits only the use of the solder profiles recommended in the industry standard specification, JEDEC 020A, paragraph 7.6, Table 3 for IR/VPR and convection reflow. Preheating is required. Hand or wave soldering is not recommended. Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. These are stress ratings only, and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of the specifications is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. DC ELECTRICAL CHARACTERISTICS (VCC = +2.7 to +3.6V, RBIAS = 47kΩ, VIH = +2.0V, VIL = +0.6V, TA = -40°C to +85°C. Typical values are at +2.75V and TA = +25°C, unless otherwise noted.) (Note 2) (Table 1) PARAMETER SYMBOL CONDITIONS MIN ULG mode ICC GPS Active Supply Current ICC Shutdown Supply Current ICC Digital Input Logic High VIH Digital Input Logic Low VIL 2 UNITS 3.7 4.5 6.5 7.6 RBIAS = 36kΩ (Note 3) 8.3 9.7 MG mode 10.2 11.8 HGLL 12.5 15.0 HGHL 17.4 20.9 MAX2385 9.6 11.6 MAX2386 16.9 22.3 SHDN mode 0.1 10 µA 0.6 V 25 µA 7.3 mA 2.0 Digital Input Current Additional Current for LO Buffer MAX RBIAS = 47kΩ LG mode CDMA Active Supply Current TYP mA V -25 BUFFEN = high mA 5.2 _______________________________________________________________________________________ CDMA + GPS LNA/Mixers (MAX2385/MAX2386 EV kit, VCC = +2.75V, TA = -40°C to +85°C, fRF = 832MHz to 870MHz (CDMA), fRF = 1575.42MHz (GPS), fIF = 110MHz, fLO = (fRF - fIF) ✕ 2 (CDMA), fLO = 1465.42MHz (GPS), LO input power = -12dBm, 50Ω RF system impedance, IF matched to 50Ω load, RBIAS = 47kΩ, VIH = +2.0V, VIL = +0.6V. Typical values are at fRF = 851MHz, TA = +25°C (CDMA). (Note 3) (Table 1) PARAMETER CONDITIONS MIN TYP MAX UNITS 200 MHz FREQUENCY RANGE IF Frequency Range RF Frequency Range LO Frequency Range (Note 4) 70 CDMA mode (Note 5) 832 870 1575.42 GPS mode CDMA mode 1260 1482 1600 GPS mode 1300 1465 1600 TA = +25°C, fRF = 851MHz 13.8 15.0 16.5 (Note 6) 13.1 TA = +25°C, fRF = 851MHz 12.4 14.0 15.4 TA = +25°C, fRF = 851MHz -0.6 0.7 2.0 (Note 6) -1.4 LG/ULG mode TA = +25°C, fRF = 851MHz -6.2 -5.3 -4.4 (Note 6) -7.1 GPS mode (MAX2385) TA = +25°C, fRF = 1575MHz 16.6 18.5 20.4 (Note 6) 14.5 GPS mode (MAX2386) TA = +25°C, fRF = 1575MHz 19.7 20.9 22.1 (Note 6) 16.8 MHz MHz LNA PERFORMANCE HGHL mode HGLL mode MG mode Gain Noise Figure TA = +25°C Noise Figure Change Over Temperature (TA = +25°C to +85°C) HGHL mode 1.5 1.8 HGLL mode 1.5 1.8 MG mode 3.8 4.7 LG/ULG mode 8.2 9.5 GPS mode 1.7 1.9 HGHL mode 0.5 HGLL mode 0.5 MG mode 0.9 LG/ULG mode 1.0 GPS mode 0.5 dB dB dB _______________________________________________________________________________________ 3 MAX2385/MAX2386 AC ELECTRICAL CHARACTERISTICS MAX2385/MAX2386 CDMA + GPS LNA/Mixers AC ELECTRICAL CHARACTERISTICS (continued) (MAX2385/MAX2386 EV kit, VCC = +2.75V, TA = -40°C to +85°C, fRF = 832MHz to 870MHz (CDMA), fRF = 1575.42MHz (GPS), fIF = 110MHz, fLO = (fRF - fIF) ✕ 2 (CDMA), fLO = 1465.42MHz (GPS), LO input power = -12dBm, 50Ω RF system impedance, IF matched to 50Ω load, RBIAS = 47kΩ, VIH = +2.0V, VIL = +0.6V. Typical values are at fRF = 851MHz, TA = +25°C (CDMA). (Note 3) (Table 1) PARAMETER IIP3 (Note 7) CONDITIONS MIN TYP HGHL mode, PIN = -25dBm/tone 4.5 7.4 HGLL mode, PIN = -30dBm/tone -0.2 3.5 MG mode, PIN = -20dBm/tone 9.2 14.1 LG/ULG mode, PIN = -20dBm/tone, RBIAS = 47kΩ 4.2 7.3 LG/ULG mode, PIN = -20dBm/tone, RBIAS = 36kΩ 7.7 10.4 GPS mode, PIN = -35dBm/tone Reverse Isolation (S12) MAX2385 UNITS dBm -5.0 MAX2386 HGHL mode MAX -6.6 20 dB MIXER PERFORMANCE HGHL/HGLL mode MG mode LG mode Gain ULG mode TA = +25°C, fRF = 851MHz 9.9 (Note 6) 8.0 TA = +25°C, fRF = 851MHz 9.6 (Note 6) 7.2 TA = +25°C, fRF = 851MHz 9.1 (Note 6) 7.0 TA = +25°C, fRF = 851MHz 1.6 (Note 6) -1.4 GPS mode (MAX2385) TA = +25°C, fRF = 1575MHz 10.3 (Note 6) 9.9 GPS mode (MAX2386) TA = +25°C, fRF = 1575MHz 12.3 (Note 6) 11.6 HGHL mode Noise Figure TA = +25°C IIP3 (Note 7) GPS PIN = -35dBm/tone 4 13.5 11.3 13.1 11.0 12.8 4.0 6.2 12.4 14.5 13.8 15.3 9 10.2 HGLL mode 8.5 9.7 MG mode 8.4 9.6 LG/ULG mode 12.5 14.5 7.5 8.5 GPS mode CDMA PIN = -25dBm/tone 11.7 HGHL/HGLL mode 0.3 3.7 MG mode -2.3 0.7 LG mode -5.4 -1.5 ULG mode -7.3 -2.8 MAX2385 -3.4 MAX2386 0 _______________________________________________________________________________________ dB dB dBm CDMA + GPS LNA/Mixers (MAX2385/MAX2386 EV kit, VCC = +2.75V, TA = -40°C to +85°C, fRF = 832MHz to 870MHz (CDMA), fRF = 1575.42MHz (GPS), fIF = 110MHz, fLO = (fRF - fIF) ✕ 2 (CDMA), fLO = 1465.42MHz (GPS), LO input power = -12dBm, 50Ω RF system impedance, IF matched to 50Ω load, RBIAS = 47kΩ, VIH = +2.0V, VIL = +0.6V. Typical values are at fRF = 851MHz, TA = +25°C (CDMA). (Note 3) (Table 1) PARAMETER CONDITIONS MIN TYP MAX UNITS -12 -10 -5 dBm LO SECTION LO Input Power LO Leakage at LNA Input LO Output Power BUFFEN = high, 100Ω load LO Output Noise Power 45MHz to 55MHz offset LO Buffer Reverse Isolation -10 -40 dBm -7 dBm -145 35 -143 dBc/Hz dB Note 2: DC characteristics are production tested at TA = +85°C. DC specifications over temperature are guaranteed by design and characterization. Note 3: Specifications are guaranteed by design and characterization. Note 4: Operation over this frequency range requires each port to be rematched for the desired operating range. Performance at various frequencies is indicated by the S-parameter data in the Typical Operating Characteristics. Note 5: Operation outside this range is possible, although not guaranteed by design and characterization. Note 6: Guaranteed by production test at fMAX (870MHz) and TMAX (+85°C). For GPS mode, fMAX = 1575.42MHz. Note 7: Specifications are based on RBIAS = 47kΩ. ICC for all LNAs and mixers is inversely proportional to RBIAS. IIP3 can be traded for ICC by selecting other values of RBIAS. Two-tone IIP3 is measured with each tone input at the specified level separated by 900kHz. _______________________________________________________________________________________ 5 MAX2385/MAX2386 AC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (MAX2385/MAX2386 EV kit, VCC = +2.75V, fRF = 851MHz (CDMA), fRF = 1575MHz (GPS), fLO = 1482MHz (CDMA), fLO = 1465MHz (GPS), PLO = -10dBm, PMIXER = -25dBm (CDMA), PMIXER = -35dBm (GPS), PLNA(HGHL) = -25dBm, PLNA(HGLL) = -30dBm, PLNA(MG) = PLNA(LG) = -20dBm, PLNA(GPS) = -35dBm, RBIAS = 47kΩ, and TA = +25°C, unless otherwise noted.) LNA NOISE FIGURE (HGLL) vs. FREQUENCY TA = +25°C 1.2 1.0 TA = -40°C 0.8 1.8 0.6 0.6 3.5 TA = +25°C 3.0 2.5 TA = -40°C 1.5 1.0 831 835 839 843 847 851 855 859 863 867 871 831 835 839 843 847 851 855 859 863 867 871 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) LNA NOISE FIGURE (LG/ULG) vs. FREQUENCY LNA NOISE FIGURE (GPS) vs. TEMPERATURE 7.5 7.0 HGLL 10 2.0 GPS MAX2385 1.5 GPS MAX2386 0.5 -20 LNA IIP3 vs. RBIAS 10 35 60 MAX2385/6 toc07 30 32 34 36 38 40 42 44 46 48 50 52 54 56 TEMPERATURE (°C) RBIAS (kΩ) MIXER GAIN vs. RBIAS MIXER IIP3 vs. RBIAS 15 12 85 HGHL/HGLL MG 8 9 LG 6 6 2 -1 -4 ULG HGLL IIP3 (dBm) GAIN (dB) HGHL MG 5 LG/ULG 10 HGHL/HGLL MAX2385/6 toc09 FREQUENCY (MHz) -15 MAX2385/6 toc08 -40 831 835 839 843 847 851 855 859 863 867 871 14 LG/ULG -15 0 5.5 MG MG 0 -10 6.0 16 5 -5 1.0 TA = -40°C 18 MAX2385/6 toc06 HGHL 15 GAIN (dB) TA = +25°C 20 MAX2385/6 toc05 2.5 NOISE FIGURE (dB) 8.0 LNA GAIN vs. RBIAS 3.0 MAX2385/6 toc04 TA = +85°C 6.5 ULG 3 LG -7 2 0 0 6 TA = +85°C 2.0 0 8.5 4 4.5 831 835 839 843 847 851 855 859 863 867 871 9.0 8 TA = -40°C 0.8 0.2 9.5 NOISE FIGURE (dB) 1.0 0.2 0 TA = +25°C 1.2 0.4 5.0 4.0 1.4 0.4 12 TA = +85°C 1.6 NOISE FIGURE (dB) NOISE FIGURE (dB) 1.6 1.4 2.0 NOISE FIGURE (dB) TA = +85°C MAX2385/6 toc02 1.8 MAX2385/6 toc01 2.0 LNA NOISE FIGURE (MG) vs. FREQUENCY MAX2385/6 toc03 LNA NOISE FIGURE (HGHL) vs. FREQUENCY IIP3 (dBm) MAX2385/MAX2386 CDMA + GPS LNA/Mixers -10 30 32 34 36 38 40 42 44 46 48 50 52 54 56 30 32 34 36 38 40 42 44 46 48 50 52 54 56 30 32 34 36 38 40 42 44 46 48 50 52 54 56 RBIAS (kΩ) RBIAS (kΩ) RBIAS (kΩ) _______________________________________________________________________________________ CDMA + GPS LNA/Mixers HGHL/HGLL 5 3 IIP3 (dBm) MG LG 1 -1 -3 ULG 6 LG GPS MAX2385 ULG -11 -9 -7 -5 -15 -13 PLO (dBm) GPS MAX2386 -11 -9 -7 -13 -15 -5 LNA GAIN vs. PIN -11 -9 -7 -5 MIXER GAIN vs. PIN GPS MAX2386 15 GPS MAX2385 GPS MAX2385 PLO (dBm) PLO (dBm) 20 16 GPS MAX2386 14 GPS MAX2385 12 HGHL HGLL GAIN (dB) 10 LG 5 MAX2385/6 toc13 -13 9 GPS MAX2386 -7 -15 HGHL/HGLL/MG 7 -5 3 ULG 11 MG MAX2385/6 toc14 9 GAIN (dB) GAIN (dB) 12 13 NOISE FIGURE (dB) GPS MAX2385 MAX2385/6 toc11 15 7 MAX2385/6 toc10 GPS HGHL/HGLL MAX2386 MIXER NOISE FIGURE vs. LO POWER MIXER IIP3 vs. LO POWER MAX2385/6 toc12 MIXER GAIN vs. LO POWER 5 10 LG 8 MG HGHL/HGLL 6 0 MG 4 -5 ULG 2 LG/ULG -10 0 -35 -30 -25 -20 -15 PIN (dBm) -10 -5 0 -35 -30 -25 -20 -15 -10 -5 0 PIN (dBm) _______________________________________________________________________________________ 7 MAX2385/MAX2386 Typical Operating Characteristics (continued) (MAX2385/MAX2386 EV kit, VCC = +2.75V, fRF = 851MHz (CDMA), fRF = 1575MHz (GPS), fLO = 1482MHz (CDMA), fLO = 1465MHz (GPS), PLO = -10dBm, PMIXER = -25dBm (CDMA), PMIXER = -35dBm (GPS), PLNA(HGHL) = -25dBm, PLNA(HGLL) = -30dBm, PLNA(MG) = PLNA(LG) = -20dBm, PLNA(GPS) = -35dBm, RBIAS = 47kΩ, and TA = +25°C, unless otherwise noted.) CDMA + GPS LNA/Mixers MAX2385/MAX2386 Pin Configuration/Functional Diagram/Typical Operating Circuit CDMA GPS GPS IF VCC A1 GLNAOUT GIF+ CLNAOUT B1 GPS GLNAIN C1 A2 A3 GMXIN A4 D1 CDMA A5 CMXIN G1 B2 MODE B3 MAX2385 RBIAS MAX2386 C2 C3 VCC CLNAIN D2 D3 GND B5 CIFB4 CIF+ VCC CDMA IF LO_OUT C5 C4 G2 GND GIF- /2 LO_IN GND D4 LO OUTPUT D5 VCC BUFFEN RBIAS VCO Pin Description 8 PIN NAME FUNCTION A1 GLNAOUT GPS LNA Output Port. This port requires an external pullup inductor and series blocking capacitor, which are part of the matching network. B1 CLNAOUT CDMA LNA Output Port. This port requires an external pullup inductor and series blocking capacitor, which are part of the matching network. C1 GLNAIN D1 GND A2, A4 GIF+, GIF- B2 G1 C2 RBIAS D2 CLNAIN Cellular RF Input Port. Requires a blocking capacitor. A3 GMIXIN GPS Mixer Input Port. Requires a series blocking capacitor. B3 MODE Logic Input (Table 1) GPS RF Input Port. Requires a blocking capacitor. Ground GPS Differential Output Port. Requires pullup inductors and blocking capacitors, which are used as part of the matching network. Logic Input (Table 1) Bias Setting Pin. The DC voltage at this pin is a bandgap voltage (+1.2V). For nominal bias, connect 47kΩ resistor to ground. The value of this resistor can be adjusted to alter the linearity of the LNAs and mixers in all modes. See Figures 2 and 3 for resistor switching application circuits. _______________________________________________________________________________________ CDMA + GPS LNA/Mixers PIN NAME FUNCTION C3 G2 Logic Input (Table 1) D3 VCC +2.7 to +3.6V Supply Pin. Bypass with 100pF capacitor as close to the pin as possible. B4, C4 CIF-, CIF+ D4 GND A5 CMIXIN B5 GND C5 LO_OUT D5 LO_IN CDMA Differential Output Port. Requires pullup inductors and blocking capacitors, which are used as part of the matching network. Ground CDMA Mixer Input Port. Requires a series blocking capacitor. Ground LO Buffer Output Port. Internally matched to 100Ω. Requires a series blocking capacitor. LO Input Port. Also LO buffer enable (BUFFEN). Apply logic signal through 10kΩ resistor. Set LO_IN high to enable the LO_OUT port. Set low to disable the LO_OUT port. AC-couple the LO input and DCcouple the buffer enable signal (see Typical Operating Circuit). Detailed Description The MAX2385/MAX2386 are ideal for CDMA + GPS applications. These devices contain two LNA/mixer pairs: one pair for CDMA operation and one pair for GPS operation. The MAX2385/MAX2386 feature seven modes of operation, including shutdown. Table 1 depicts each mode along with the corresponding LNA and mixer configuration. These devices are ideal for Japanese cdma2000 1x applications. The RF frequency range is from 832MHz to 870MHz, and the IF frequency range is from 70MHz to 200MHz. In GPS mode, the RF frequency is 1575.42MHz. These devices can also be used for the Korean/Chinese/U.S. 869MHz to 894MHz band. CDMA LNA The MAX2385/MAX2386 have four modes of CDMA LNA operation: high gain, high linearity (HGHL); high gain, low linearity (HGLL); midgain (MG); and low gain (LG). The logic inputs MODE, G1, and G2 allow selection between these modes (Table 1). Use HGHL mode when extra-high linearity is required for cross-modulation suppression. When cross-modulation is not a concern or the transmitter is off, use HGLL mode. In MG mode, the device is designed to meet CDMA linearity with interferers at -32dBm/tone. When Table 1. Mode Selection Truth Table MODES FUNCTION CONTROL PINS LNA MIXER G1 G2 MODE HGHL HGLL MG LGHL GPS HG MG LG UL GPS High Gain, High Linearity (HGHL) 0 0 1 ● — — — — ● — — — — High Gain, Low Linearity (HGLL) 1 1 0 — ● — — — ● — — — — Midgain (MG) 1 0 1 — — ● — — — ● — — — Low Gain (LG) 1 1 1 — — — ● — — — ● — — Ultra-Low Gain (ULG) 1 0 0 — — — ● — — — — ● — GPS 0 1 1 — — — — ● — — — — ● Shutdown (SHDN) 0 X 0 — — — — — — — — — — _______________________________________________________________________________________ 9 MAX2385/MAX2386 Pin Description (continued) MAX2385/MAX2386 CDMA + GPS LNA/Mixers RF Inputs receiving large signals, use LG mode to significantly reduce current consumption (see the RBIAS Switching section). The mixer inputs CMIX_IN and GMIX_IN are typically connected to the LNA output through an off-chip image-reject bandpass filter. The LNA inputs and outputs require external matching networks to 50Ω. CDMA Downconverter The CDMA mixer has four modes of operation for optimal performance and current conservation. The logic inputs MODE, G1, and G2 allow selection between the different modes (Table 1). The mixer output appears at the differential CIF+ and CIF- pins. Each of these open-collector outputs requires an external pullup inductor to VCC for DC biasing. This port requires a matching network for coupling to an external IF filter. To further reduce board complexity, the CDMA and GPS mixer outputs can be combined, eliminating one of the IF filters (Figure 1). Applications Information RBIAS Switching Figures 2 and 3 show more sophisticated methods of varying the bias currents in different modes of operation. By adding a shunt resistor to RBIAS, the user can increase or decrease the total bias resistance (and therefore the bias current) in different modes, keeping in mind that the voltage at the R BIAS pin is +1.2V. Figure 2 uses a shunt resistor to decrease the total bias resistance (when R SHUNT is tied low). This method uses an additional DSP I/O control line. To avoid adding an extra I/O line to the system, the user can use the existing logic lines (MODE, G1, and G2). Figure 3 utilizes the G1 control pin, a transistor, and an additional resistor to change the bias current in certain modes. Both figures are simple ways to accommodate a wide range of power schemes. LO Output Buffer The LO_IN pin controls the LO output buffer. This pin turns the open-collector LO output buffer on and off to conserve current consumption as needed (see Pin Description and Typical Operating Circuits). CDMA GPS VCC GLNAOUT A1 CLNAOUT B1 GPS GLNAIN C1 GND D1 CDMA GIF+ A2 GMXIN A3 GIFA4 CMXIN A5 CDMA IF G1 B2 MODE B3 CIFB4 GND B5 VCC RBIAS C2 MAX2385 MAX2386 C3 C4 G2 CIF+ VCC CLNAIN D2 /2 LO OUTPUT LO_IN GND D3 LO_OUT C5 D4 D5 VCC RBIAS BUFFEN VCO Figure 1. Typical Operating Circuit with CDMA and GPS Mixers Combined 10 ______________________________________________________________________________________ CDMA + GPS LNA/Mixers G2 MODE G2 MAX2385 MAX2386 DSP G1 MAX2385 MAX2386 G1 DSP RBIAS RSHUNT RBIAS RBIAS RSHUNT RBIAS Figure 2. Variable Bias Current Application Circuit with Shunt Resistor (Using 4 DSP I/O Ports) Layout For the MAX2385/MAX2386, keep RF signal lines as short as possible to minimize losses and radiation. Always use controlled-impedance lines on all high-frequency inputs and outputs and use low-inductance connections to ground on all GND pins. At the mixer outputs, keep the differential lines together and of the same length to ensure signal balance. For the best gain and noise performance, use high-Q (greater than 40) components for the LNA input matching circuit. For the power supplies, a star topology works well to isolate different sections of the device. Each VCC node has its own path to a central VCC; place decoupling capacitors that provide low impedance at the RF frequency of interest close to all VCC connections. The central VCC should have a large decoupling capacitor as well. (Use the MAX2385/MAX2386 EV kit as an example.) Figure 3. Variable Bias Current Application Circuit with Shunt Resistor and Transistor (Using 3 DSP I/O Ports) ment. Operating Life and Moisture Resistance remain uncompromised as they are primarily determined by the wafer-fabrication process. Mechanical stress performance is a greater consideration for a UCSP. UCSP solder joint contact integrity must be considered since the package is attached through direct solder contact to the user’s PC board. Testing done to characterize the UCSP reliability performance shows that it is capable of performing reliably through environmental stresses. Results of environmental stress tests and additional usage data and recommendations are detailed in the UCSP application note, which can be found on Maxim’s website, www.maxim-ic.com. Chip Information TRANSISTOR COUNT: 882 UCSP Reliability The UCSP represents a unique package that greatly reduces board space compared to other packages. UCSP reliability is integrally linked to the user’s assembly methods, circuit board material, and usage environ- ______________________________________________________________________________________ 11 MAX2385/MAX2386 MODE MAX2385/MAX2386 CDMA + GPS LNA/Mixers Table 2. CDMA LNA Input/Output S-Parameters (VCC = +2.75V, HGHL mode, PIN = -25dBm, TA = +25°C.) LNA (S11) FREQUENCY (MHz) MAGNITUDE PHASE 12 LNA (S21) LNA (S12) LNA (S22) MAGNITUDE PHASE MAGNITUDE PHASE MAGNITUDE 50 0.82104 -18.917 15.163 162.26 0.008859 61.194 0.93816 -8.524 100 0.79059 -35.311 14.116 146.34 0.014972 56.033 0.9 -15.727 200 0.72668 -61.742 11.39 120.52 0.022655 49.886 0.82915 -26.165 300 0.67807 -79.66 8.9718 99.984 0.028431 41.627 0.76987 -33.613 400 0.65661 -91.203 7.157 84.957 0.033642 37.358 0.74408 -39.372 500 0.64978 -99.023 5.7084 71.771 0.036502 32.065 0.73645 -44.949 600 0.65829 -104.2 4.7039 60.529 0.038605 27.6 0.74107 -50.121 700 0.67233 -108.36 3.9155 50.374 0.040918 22.124 0.74733 -55.876 800 0.68999 -111.47 3.2525 41.972 0.041445 20.385 0.7488 -60.721 900 0.702 -114.16 2.8111 34.401 0.042523 15.732 0.7551 -65.167 1000 0.71895 -116.44 2.3588 27.944 0.042027 15.121 0.76309 -69.283 1100 0.73319 -105.27 2.1266 31.814 0.041601 22.198 0.7667 -63.916 1200 0.74219 -106.33 1.825 28.21 0.039986 24.408 0.77436 -67.166 1300 0.74866 -107.28 1.6416 22.128 0.039224 23.437 0.77688 -70.727 1400 0.74754 -108.6 1.3985 19.782 0.036991 34.906 0.77974 -74.103 1500 0.73605 -110.8 1.2448 12.452 0.039238 38.898 0.77553 -77.75 1600 0.70134 -112.49 1.1067 12.494 0.045549 49.797 0.76585 -82.098 1700 0.6582 -112.85 0.95822 10.492 0.054447 48.936 0.74631 -86.403 1800 0.6033 -111.43 0.91231 12.519 0.067901 49.382 0.72062 -89.675 1900 0.57173 -106.57 0.88767 11.188 0.083089 39.015 0.7041 -91.673 2000 0.58916 -101.57 0.89238 6.1977 0.08768 26.514 0.70733 -93.886 2100 0.62231 -106.52 0.87333 -10.742 0.088886 5.5701 0.72648 -113.38 2200 0.65061 -107.79 0.82724 -15.813 0.08226 -1.5463 0.73464 -117.81 2300 0.66787 -109.78 0.75591 -20.723 0.075059 -8.1367 0.74428 -121.46 2400 0.6805 -112.17 0.72192 -29.025 0.075932 -12.349 0.75146 -124.61 2500 0.68889 -114.76 0.69034 -30.738 0.068259 -12.597 0.76003 -126.98 2600 0.68822 -117.18 0.63968 -40.185 0.069004 -18.123 0.76771 -128.85 2700 0.68522 -118.88 0.62919 -39.975 0.062396 -12.912 0.77449 -129.87 2800 0.67295 -119.94 0.54062 -53.183 0.065634 -19.789 0.77681 -130.85 2900 0.65681 -119.56 0.57411 -55.978 0.068559 -13.648 0.77386 -130.5 3000 0.6406 -116.75 0.47351 -68.632 0.073007 -23.644 0.76331 -130.75 ______________________________________________________________________________________ PHASE CDMA + GPS LNA/Mixers (VCC = +2.75V, PIN = -35dBm, TA = +25°C.) LNA (S11) FREQUENCY (MHz) MAGNITUDE PHASE LNA (S21) LNA (S12) LNA (S22) MAGNITUDE PHASE MAGNITUDE PHASE MAGNITUDE PHASE 50 0.8881 -10.276 12.74 171.11 0.000854 -46.423 0.98314 -2.5681 100 0.87883 -19.876 12.522 162.24 0.001371 -126.02 0.97935 -5.5591 200 0.85269 -37.083 11.405 147.59 0.00223 90.404 0.97791 -9.7614 300 0.82551 -51.884 10.051 133.59 0.003701 -15.896 0.94946 -14.756 400 0.79436 -63.329 8.7681 123.73 0.002164 -175.91 0.94573 -19.049 500 0.78337 -72.116 7.5222 114.72 0.00311 138.82 0.9238 -22.814 600 0.76465 -78.478 6.5198 107.75 0.001366 -24.339 0.91664 -26.61 700 0.75639 -83.373 5.7296 101.89 0.004057 161.18 0.89418 -29.394 800 0.75274 -86.423 5.0437 97.629 0.004929 120.97 0.88958 -31.893 900 0.74643 -88.842 4.5469 93.487 0.004204 -166.83 0.87952 -34.284 1000 0.7484 -90.397 3.9871 90.549 0.005463 160.93 0.87286 -36.748 1100 0.75126 -84.499 3.7583 87.421 0.003834 152.9 0.87422 -43.23 1200 0.75045 -84.413 3.3761 86.774 0.007564 -171.16 0.86435 -46.442 1300 0.75019 -85.343 3.153 82.014 0.008098 175.38 0.85327 -48.168 1400 0.73538 -85.134 2.8377 82.496 0.008035 163.28 0.8562 -50.651 1500 0.73794 -85.398 2.6311 76.473 0.010423 169.5 0.85417 -54.145 1600 0.74538 -84.931 2.5096 77.268 0.011307 154.83 0.85631 -57.714 1700 0.74721 -85.902 2.3007 74.063 0.009457 -177.89 0.84548 -61.86 1800 0.74474 -86.965 2.2418 72.75 0.016112 168.47 0.8355 -65.064 1900 0.74265 -87.91 2.0474 69.84 0.012632 161.3 0.83073 -67.749 2000 0.74108 -88.363 1.9162 65.908 0.015341 171.63 0.84221 -70.646 2100 0.73645 -102.43 1.7839 49.151 0.019307 155.89 0.84753 -93.549 2200 0.73726 -104.01 1.6905 47.571 0.020637 155.74 0.85656 -96.187 2300 0.74534 -105.62 1.5469 47.693 0.01424 149.71 0.85279 -97.932 2400 0.74851 -106.99 1.429 42.865 0.022058 155.79 0.85584 -99.37 2500 0.7437 -109.08 1.4322 43.875 0.023264 162.52 0.85403 -99.414 2600 0.74111 -109.18 1.2847 39.437 0.029562 145.34 0.86433 -98.503 2700 0.73562 -109 1.348 42.59 0.030335 159.82 0.86743 -97.119 2800 0.73762 -108.7 1.1102 37.712 0.031365 148.42 0.87149 -94.704 2900 0.73003 -107.33 1.3082 37.893 0.03709 153.25 0.88967 -91.608 3000 0.72034 -104.98 1.1232 35.283 0.036386 149.03 0.91018 -88.371 ______________________________________________________________________________________ 13 MAX2385/MAX2386 Table 3. MAX2385 GPS LNA Input/Output S-Parameters MAX2385/MAX2386 CDMA + GPS LNA/Mixers Table 4. MAX2386 GPS LNA Input/Output S-Parameters (VCC = +2.75V, PIN = -35dBm, TA = +25°C.) LNA (S11) FREQUENCY (MHz) MAGNITUDE PHASE 14 LNA (S21) LNA (S12) LNA (S22) MAGNITUDE PHASE MAGNITUDE PHASE MAGNITUDE PHASE 50 0.93093 -9.9234 9.3584 172.05 0.002323 -54.05 0.99417 -1.8979 100 0.92289 -19.653 9.2132 164.45 0.000496 57.839 0.99682 -4.5868 200 0.89539 -37.282 8.5374 150.4 0.00225 26.492 0.99239 -8.855 300 0.86825 -52.517 7.726 137.89 0.003334 21.881 0.96568 -13.228 400 0.84814 -63.866 6.875 128.59 0.004084 102.66 0.96299 -17.715 500 0.82959 -73.038 5.9132 119.99 0.001849 -140.39 0.94258 -21.386 600 0.80564 -79.88 5.2466 112.83 0.000774 148.15 0.91985 -25.462 700 0.79496 -85.049 4.6978 108.58 0.00295 170.05 0.89936 -28.606 800 0.78756 -88.974 4.1138 103.96 0.002164 122.22 0.88788 -30.729 900 0.78142 -91.371 3.7944 100.16 0.004646 139.17 0.87917 -32.896 1000 0.76891 -93.61 3.3492 96.82 0.0015 74.177 0.86275 -34.722 1100 0.77088 -89.176 3.0396 91.958 0.004438 168.05 0.85671 -43.739 1200 0.76408 -89.243 2.7793 90.924 0.005482 160.32 0.84645 -45.813 1300 0.76674 -89.051 2.6492 86.53 0.008324 -176.28 0.84257 -48.391 1400 0.75046 -89.091 2.4207 87.443 0.0095 153.3 0.83675 -50.311 1500 0.73704 -88.676 2.2241 81.067 0.01155 159.89 0.83713 -52.537 1600 0.74039 -88.323 2.1385 81.249 0.010586 168.2 0.83993 -55.649 1700 0.73209 -88.526 1.977 77.837 0.004729 158.14 0.82256 -60.202 1800 0.72622 -89.25 1.9477 75.755 0.012002 178.27 0.81745 -63.505 1900 0.71876 -89.705 1.7977 74.042 0.018606 -174.16 0.81525 -66.569 2000 0.70567 -103.91 1.642 56.109 0.01812 159.5 0.82317 -85.615 2100 0.69916 -104.37 1.5328 53.53 0.019806 146.88 0.81154 -88.54 2200 0.69426 -105.75 1.472 52.614 0.021388 155.43 0.83009 -91.792 2300 0.70075 -106.94 1.3837 51.155 0.023509 155.3 0.81304 -93.384 2400 0.68775 -108.09 1.2782 46.539 0.024414 161.94 0.83104 -93.847 2500 0.69363 -107.69 1.2919 46.734 0.02846 157.24 0.83166 -93.821 2600 0.68198 -108.89 1.1646 42.142 0.031474 152.73 0.83121 -92.19 2700 0.67769 -107.45 1.2674 43.275 0.038727 157.21 0.84505 -90.662 2800 0.66527 -106.26 1.0548 39.199 0.030616 158.41 0.85766 -88.492 2900 0.65156 -105.01 1.199 34.902 0.040846 155.88 0.8744 -84.945 3000 0.62987 -100.71 1.0408 33.545 0.046665 149.57 0.88394 -82.392 ______________________________________________________________________________________ CDMA + GPS LNA/Mixers (V CC = +2.75V, HGHL mode, P IN = -25dBm, T A = +25°C.) MIXER (S11) FREQUENCY (MHz) MAGNITUDE 50 0.93046 -6.6632 100 0.92412 -13.133 0.90168 300 400 200 Table 6. CDMA Mixer Output Differential S11 (VCC = +2.75V, HGHL mode, PIN = -15dBm, TA = +25°C.) FREQUENCY (MHz) MIXER (S11) MAGNITUDE PHASE 10 1.00000 0.002397 100 0.999402 0.002001 -24.229 200 1.00000 0.0013 0.8875 -32.661 300 0.998319 -0.00621 0.87468 -40.11 400 0.997316 -0.01524 0.993268 -0.03386 PHASE 500 0.86943 -45.949 500 600 0.86591 -50.181 600 0.987986 -0.05857 700 0.8607 -53.579 700 0.987624 -0.10057 0.85764 -55.96 800 0.980803 -0.15007 800 900 0.85557 -57.434 900 0.958863 -0.24163 1000 0.85053 -58.83 1000 0.900263 -0.37955 1100 0.84695 -35.068 1200 0.82035 -34.487 1300 0.79503 -32.441 1400 0.76968 -30.2 1500 0.75583 -27.952 1600 0.72199 -26.279 1700 0.7057 -25.567 1800 0.68058 -25.45 1900 0.64409 -27.348 2000 0.61607 -29.869 2100 0.58273 -33.144 2200 0.55117 -40.677 2300 0.53115 -50.662 2400 0.52487 -62.537 2500 0.54332 -73.998 2600 0.57729 -84.522 2700 0.61971 -92.905 2800 0.6639 -98.578 2900 0.70686 -101.6 3000 0.74855 -102.76 ______________________________________________________________________________________ 15 MAX2385/MAX2386 Table 5. CDMA Mixer Input S11 MAX2385/MAX2386 CDMA + GPS LNA/Mixers Table 7. GPS Mixer Input S11 (VCC = +2.75V, PIN = -35dBm, TA = +25°C.) 16 Table 8. GPS Mixer Output Differential S11 (VCC = +2.75V, HGHL mode, PIN = -25dBm, TA = +25°C.) MIXER (S11) FREQUENCY (MHz) MAGNITUDE PHASE 50 0.95129 -5.7747 FREQUENCY (MHz) MAGNITUDE PHASE 100 0.98072 -13.23 10 1.00000 0.002458 0.001452 MIXER (S11) 200 0.7896 -17.621 100 0.998001 300 0.85569 -25.573 200 1.00000 -0.0011 400 0.86559 -32.411 300 1.0000 -0.00689 500 0.86298 -36.828 400 0.997162 -0.01806 600 0.86065 -40.63 500 0.920826 -0.04242 700 0.85671 -42.573 600 0.989409 -0.07002 800 0.83894 -44.002 700 0.982752 -0.11838 900 0.84149 -43.389 800 0.975379 -0.18777 1000 0.82442 -29.719 900 0.925681 -0.32983 1100 0.81692 -27.815 1000 0.755068 -0.58182 1200 0.80344 -26.796 1300 0.79181 -25.83 1400 0.77083 -25.385 1500 0.75552 -26.72 1600 0.72526 -29.415 1700 0.70046 -34.652 1800 0.66881 -40.769 1900 0.65244 -49.746 2000 0.64631 -60.826 2100 0.64566 -90.805 2200 0.66798 -102.61 2300 0.71 -113.58 2400 0.74633 -123.91 2500 0.74105 -130.6 2600 0.75438 -132.27 2700 0.78455 -131.97 2800 0.79948 -130.92 2900 0.82474 -128.26 3000 0.84153 -124.77 ______________________________________________________________________________________ CDMA + GPS LNA/Mixers MAX2385/MAX2386 Table 9. CDMA LNA Typical Noise Parameters (VCC = +2.75V, HGHL mode, TA = +25°C, data from design simulation.) FREQUENCY (MHz) NFMIN (dB) | ΓOPT | ∠ ΓOPT RN (Ω) 800 1.243 0.3512 96.93 8.528 810 1.251 0.3529 97.7 8.522 820 1.259 0.3547 98.47 8.516 830 1.267 0.3565 99.23 8.511 840 1.275 0.3583 99.98 8.506 850 1.283 0.36 100.7 8.501 860 1.292 0.3618 101.5 8.496 870 1.3 0.3636 102.2 8.491 880 1.308 0.3654 102.9 8.487 890 1.317 0.3672 103.6 8.483 900 1.326 0.369 104.3 8.479 Table 10. GPS LNA Typical Noise Parameters (VCC = +2.75V, fRF = 1575.42MHz, HGHL mode, TA = +25°C, data from design simulation.) PART NFMIN (dB) ΓOPT ∠ ΓOPT RN (Ω) MAX2385 1.43 0.443 94.2 11.47 MAX2386 1.33 0.382 91.5 10.00 ______________________________________________________________________________________ 17 CDMA + GPS LNA/Mixers 20L UCSP.EPS MAX2385/MAX2386 Package Information Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 18 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2001 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.