19-0797; Rev 2; 9/09 KIT ATION EVALU E L B AVAILA GPS/GNSS Low-Noise Amplifier Features The MAX2659 high-gain, low-noise amplifier (LNA) is designed for GPS, Galileo, and GLONASS applications. Designed in Maxim’s advanced SiGe process, the device achieves a 20.5dB gain and an ultra-low-noise figure of 0.8dB while maximizing the input-referred 1dB compression point and the 3rd-order intercept point at -12dBm and -5dBm, respectively. o High-Power Gain: 20.5dB The MAX2659 operates from a +1.6V to +3.3V single supply and consumes only 4.1mA. The shutdown feature in the device reduces the supply current to be less than 1µA. The MAX2659 is available in a very small, lead-free, RoHS-compliant, 1.5mm x 1.0mm x 0.75mm, 6-pin µDFN package. o Low Bill of Materials o Ultra-Low-Noise Figure: 0.8dB o Integrated 50Ω Output Matching Circuit o Low Supply Current: 4.1mA o Wide Supply Voltage Range: 1.6V to 3.3V o Small Footprint: 1.5mm x 1.0mm o Thin Profile: 0.75mm o Lead-Free and RoHS-Compliant Package Applications . Automotive Navigation Location-Enabled Mobile Devices Ordering Information Telematics (Asset Tracking and Management) PART Personal Navigation Device (PND) TEMP RANGE MAX2659ELT+ Cellular Phones with GPS Notebook PC/Ultra-Mobile PC Recreational, Marine Navigation PIN-PACKAGE -40°C to +85°C 6 μDFN MAX2659ELT/V+ -40°C to +85°C +Denotes a lead-free package. /V denotes an automotive qualified part. 6 μDFN Avionics Pin Diagram/Functional Diagram/Typical Application Circuit + MAX2659 GND GND 1 6 2 5 RFOUT RF OUTPUT SHDN LOGIC CONTROL VCC RFIN RF INPUT 3 C1 BIAS L1 4 VCC C2 L1 = 6.8nH C1 = 470pF C2 = 33nF ________________________________________________________________ Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com. 1 MAX2659 General Description MAX2659 GPS/GNSS Low-Noise Amplifier ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +4.2V Other Pins to GND....................-0.3V to + Operating VCC + 0.3V Maximum RF Input Power .............................................+10dBm Continuous Power Dissipation (TA = +70°C) 6-Pin µDFN (derates 2.1mW/°C above +70°C)............167mW Operating Temperature Range ...........................-40°C to +85°C Junction Temperature ......................................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10s) .................................+260°C CAUTION! ESD SENSITIVE DEVICE 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 (MAX2659 EV kit; VCC = 1.6V to 3.3V, TA = -40°C to +85°C, no RF signals are applied. Typical values are at VCC = 2.85V and TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS Supply Voltage Supply Current MIN TYP 1.6 2.85 3.3 V 4.1 5.6 mA 1 μA SHDN = high Shutdown mode, SHDN = low Digital Input-Logic High 1.1 Digital Input Current SHDN = high UNITS V Digital Input-Logic Low RFIN DC Voltage MAX 0.4 V 1 μA 0.83 V AC ELECTRICAL CHARACTERISTICS (MAX2659 EV kit; VCC = 1.6V to 3.3V, TA = -40°C to +85°C, fRFIN = 1575.42MHz. Typical values are at VCC = 2.85V and TA = +25°C, unless otherwise noted.) (Note 1) PARAMETER RF Frequency Power Gain CONDITIONS MIN L1 band TYP MAX 1575.42 VCC = 2.85V 17 20.5 VCC = 1.6V 16.5 20.5 UNITS MHz dB Noise Figure (Note 2) 0.8 dB 3rd-Order Input Intercept Point (Note 3) -5 dBm Input 1dB Compression point (Note 4) -12 dBm Input Return Loss (Note 2) 10 15 dB Output Return Loss (Note 2) 10 Reverse Isolation (Note 2) 25 dB 32 dB Note 1: Min and Max limits guaranteed by test at TA = +25°C and guaranteed by design and characterization at TA = -40°C and TA = +85°C. Note 2: Guaranteed by design and characterization. Note 3: Measured with the two tones located at 5MHz and 10MHz offset from the center of the GPS band with -40dBm/tone. Note 4: Measured with a tone located at 5MHz offset from the center of the GPS band. 2 _______________________________________________________________________________________ GPS/GNSS Low-Noise Amplifier 20 20.8 4.1 +25°C 3.9 -40°C GAIN (dB) 15 GAIN (dB) SUPPLY CURRENT (mA) 21.0 MAX2659 toc02 MAX2659 toc01 +85°C 4.3 GAIN vs. SUPPLY VOLTAGE GAIN vs. RF FREQUENCY 25 MAX2659 toc03 SUPPLY CURRENT vs. SUPPLY VOLTAGE 4.5 10 5 20.6 20.4 0 3.7 20.2 -5 3.5 2.2 2.4 2.6 2.8 3.0 3.2 3.4 500 750 1000 1250 1500 1750 2000 2250 2500 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 SUPPLY VOLTAGE (V) RF FREQUENCY (MHz) SUPPLY VOLTAGE (V) NOISE FIGURE vs. TEMPERATURE NOISE FIGURE vs. SUPPLY VOLTAGE INPUT RETURN LOSS vs. RF FREQUENCY 0.4 0.2 0.6 0.4 0.2 0 -15 10 35 60 85 OUTPUT RETURN LOSS vs. RF FREQUENCY REVERSE ISOLATION vs. RF FREQUENCY -20 -25 -30 -35 MAX2659 toc06 500 750 1000 1250 1500 1750 2000 2250 2500 RF FREQUENCY (MHz) IIP3 vs. TEMPERATURE MAX2659 toc08 -3.5 -30 -4.0 TWO TONES LOCATED AT 5MHz AND 10MHz OFFSET WITH -40dBm/TONE -4.5 -40 IIP3 (dBm) -15 -20 REVERSE ISOLATION |S12| (dB) MAX2659 toc07 -10 -20 3.0 3.2 3.4 SUPPLY VOLTAGE (V) -5 -15 -30 1.6 1.8 2.0 2.2 2.4 2.6 2.8 TEMPERATURE (°C) 0 -10 -25 0 -40 -5 MAX2659 toc09 0.6 0.8 0 INPUT RETURN LOSS |S11| (dB) 0.8 MAX2659 toc05 1.0 NOISE FIGURE (dB) 1.0 NOISE FIGURE (dB) 1.2 MAX2659 toc04 1.2 OUTPUT RETURN LOSS |S22| (dB) 20.0 -10 1.6 1.8 2.0 -50 -5.0 -60 -5.5 -70 -6.0 -40 -6.5 -80 -45 500 750 1000 1250 1500 1750 2000 2250 2500 500 750 1000 1250 1500 1750 2000 2250 2500 RF FREQUENCY (MHz) RF FREQUENCY (MHz) -40 -15 10 35 60 85 TEMPERATURE (°C) _______________________________________________________________________________________ 3 MAX2659 Typical Operating Characteristics (MAX2659 EV kit; Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.) Typical Operating Characteristics (continued) (MAX2659 EV kit; Typical values are at VCC = 2.85V, TA = +25°C, and fRFIN = 1575.42MHz, unless otherwise noted.) INPUT P1dB COMPRESSION vs. TEMPERATURE -5 -6 -10 -7 -12 -13 -14 -15 -8 1.6 1.8 2.0 2.2 2.4 2.6 2.8 -40 3.0 3.2 3.4 10 35 60 TEMPERATURE (°C) INPUT P1dB COMPRESSION vs. SUPPLY VOLTAGE INPUT P1dB COMPRESSION vs. JAMMER FREQUENCY -14 -16 MAX2659 toc13 -5 P1dB COMPRESSION (dBm) -12 85 0 MAX2659 toc12 -10 -18 -10 -15 -20 -25 -20 -30 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 500 750 1000 1250 1500 1750 2000 2250 2500 SUPPLY VOLTAGE (V) JAMMER FREQUENCY (MHz) NF vs. JAMMER POWER AT 850MHz NF vs. JAMMER POWER AT 1850MHz 3.5 MAX2659 toc14 3.5 3.0 3.0 2.5 NF (dB) 2.5 2.0 1.5 2.0 1.5 1.0 1.0 0.5 0.5 0 0 -30 -25 -20 -15 JAMMER POWER (dBm) 4 -15 SUPPLY VOLTAGE (V) -8 P1dB COMPRESSION (dBm) -11 MAX2659 toc15 IIP3 (dBm) -4 -9 MAX2659 toc11 TWO TONES LOCATED AT 5MHz AND 10MHz OFFSET WITH -40dBm/TONE P1dB COMPRESSION (dBm) -3 MAX2659 toc10 IIP3 vs. SUPPLY VOLTAGE NF (dB) MAX2659 GPS/GNSS Low-Noise Amplifier -10 -5 -30 -25 -20 -15 JAMMER POWER (dBm) _______________________________________________________________________________________ -10 GPS/GNSS Low-Noise Amplifier PIN NAME FUNCTION 1, 2 GND Ground. Connect to the PCB ground plane. 3 RFIN RF Input. Requires a DC-blocking capacitor and external matching components. 4 VCC Supply Voltage. Bypass to ground with a 33nF capacitor as close as possible to the IC. 5 SHDN Shutdown Input. A logic-low disables the device. 6 RFOUT RF Output. RFOUT is internally matched to 50 and incorporates an internal DC-blocking capacitor. Detailed Description The MAX2659 is an LNA designed for GPS L1, GALILEO, and GLONASS applications. The device features a power-shutdown control mode to eliminate the need for an external supply switch. The device achieves a 20.5dB gain and an ultra-low-noise figure of 0.8dB. The MAX2659 consumes approximately 4.1mA while providing a IP1dB of -12dBm and an IIP3 of -5dBm. Input and Output Matching The MAX2659 requires an off-chip input matching. Only a 6.8nH inductor in series with a DC-blocking capacitor is needed to form the input matching circuit. The Typical Application Circuit diagram shows the recommended input-matching network. These values are optimized for the best simultaneous gain, noise figure, and return loss performance. Table 1 lists typical device S11 values. The MAX2659 integrates an on-chip output matching to 50Ω at the output, eliminating the need for external matching components. Shutdown The MAX2659 includes a shutdown feature to turn off the entire chip. Apply a logic high to SHDN pin to place the part in the active mode and a logic low to place the part in the shutdown mode. Applications Information A properly designed PC board (PCB) is essential to any RF microwave circuit. Use controlled-impedance lines on all high-frequency inputs and outputs. Bypass VCC with decoupling capacitors located close to the device. For long VCC lines, it may be necessary to add decoupling capacitors. Locate these additional capacitors further away from the device package. Proper grounding of the GND pins is essential. If the PCB uses a topside RF ground, connect it directly to the GND pins. For a board where the ground is not on the component layer, connect the GND pins to the board with multiple vias close to the package. Table 1. Typical S11 Values FREQUENCY (MHz) REAL S11 Chip Information IMAGINARY S11 PROCESS: SiGe BiCMOS 1000 -0.58 -j0.52 1100 -0.68 -j0.356 1200 -0.74 -j0.16 1300 -0.74 j0.036 1400 -0.676 j0.22 Package Information 1500 -0.56 j0.36 1575 -0.47 j0.415 For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. 1600 -0.44 j0.43 PACKAGE TYPE PACKAGE CODE DOCUMENT NO. 1700 -0.36 j0.467 6 µDFN L611-2 21-0147 1800 -0.3 j0.51 1900 -0.228 j0.567 2000 -0.14 j0.622 _______________________________________________________________________________________ 5 MAX2659 Pin Description MAX2659 GPS/GNSS Low-Noise Amplifier Revision History PAGES CHANGED REVISION NUMBER REVISION DATE 0 4/07 Initial release — 1 5/08 Updated Digital Input-Logic High specification and added RFIN DC Voltage specification in DC Electrical Characteristics table 2 2 9/09 Added MAX2659ELT/V+ to Ordering Information 1 DESCRIPTION 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 _____________________ 6 © 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.