19-5670; Rev 0; 12/10 TION KIT EVALUA BLE A IL A V A GPS/GNSS LNAs with Antenna Switch and Bias The MAX2674/MAX2676 are ultra-small, high-IP3, lownoise amplifiers (LNAs) designed for GPS L1, Galileo, and GLONASS applications. Designed in Maxim’s advanced SiGe process, the devices are also equipped with an autosensing feature for applications that enable the use of external antennas. These high-performance LNAs provide high gain and an ultra-low noise figure while optimizing the input-referred 2dB compression point and 3rd-order intercept point. The ultra-small size is ideal for front-end modules and receiver applications in cellular phones, smartphones, PDAs, PNDs, or other custom GNSS applications. The MAX2674/MAX2676 operate from a 1.6V to 3.6V single supply. The MAX2674 is optimized for high gain, while the MAX2676 is optimized for high linearity. A shutdown feature is present in both devices reducing the supply current to less than 10FA. The antenna port automatically senses when an external antenna is connected, eliminating the need for additional control circuitry while also providing improved short-circuit protection. The MAX2674/MAX2676 are available in an ultra-small, RoHS-compliant 0.86mm x 1.26mm x 0.64mm waferlevel package (WLP). Features S Eliminate Discrete Antenna Sensing, Switching, and Bias Networks Autodetect Antenna Connection Provide Antenna Bias Short-Circuit Protection S Wide 1.6V to 3.6V Supply Voltage Range S Ultra-Small Footprint (0.86mm x 1.26mm) WLP Package S For Applications Without Antenna Port, Use PinCompatible 4-Bump MAX2686/MAX2687/MAX2688 LNA Applications Front-End SAW Modules Receiver Modules Cellular and Smartphones Avionics and Military Telematics (Asset Tracking and Management) Personal Navigation Devices (PNDs) Recreational, Marine Navigation Ordering Information PART TEMP RANGE PIN-PACKAGE MAX2674EWT+T -40NC to +85NC 6 WLP MAX2676EWT+T -40NC to +85NC 6 WLP +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Typical Operating Circuit 1.6V TO 3.6V A1 10pF VCC MAX2674 MAX2676 100pF A2 RFOUT RFOUT/SHDN 25kI SHDN 39pF 100pF OPTIONAL 88nH B1 B2 RFIN OPTIONAL GNDAC ANT BIAS C1 GNDDC C2 ACTIVE ANTENNA ANT ________________________________________________________________ Maxim Integrated Products 1 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. MAX2674/MAX2676 General Description MAX2674/MAX2676 GPS/GNSS LNAs with Antenna Switch and Bias ABSOLUTE MAXIMUM RATINGS VCC to GND_.........................................................-0.3V to +3.9V Other Pins to GND_................................... -0.3V to (VCC + 0.3V) Maximum Input Power...................................................... +5dBm Continuous Power Dissipation (TA = +70NC) WLP (derate 10.5mW/NC above +70NC)......................840mW Operating Temperature Range........................... -40NC to +85NC Junction Temperature......................................................+150NC Storage Temperature Range............................. -65NC to +160NC Soldering Temperature (reflow, Note 1)...........................+260NC Note 1: Refer to Application Note 1891: Wafer-Level Packaging (WLP) and its Applications. 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 (VCC = 1.6V to 3.6V, no RF signal applied, TA = -40NC to +85NC. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS Supply Voltage MIN TYP MAX UNITS 1.6 3.3 3.6 V Supply Current Shutdown Current 4.5 VSHDN = 0V Shutdown Logic-Low Shutdown Logic-High 7 mA 10 FA 0.45 V 1.2 V ANT Sense Threshold Causes autosense to switch to ANT 75 200 850 FA ANT Current Limit ANT connected to GND_ 20 30 45 mA ANT Port Supply Drop Voltage drop from VCC with 10mA load on ANT 75 mV AC ELECTRICAL CHARACTERISTICS (VCC = 1.6V to 3.6V, fRFIN = 1575.42MHz, TA = -40NC to +85NC. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise noted.) (Note 2) PARAMETER CONDITIONS MIN TYP MAX UNITS Minimum RF Input Frequency 1575.42 MHz Maximum RF Input Frequency 1610 MHz Power Gain MAX2674 13 18 MAX2676 11 15 Noise Figure 0.75 In-Band Input IP3 MAX2674, RF input = fO Q2.5MHz at -40dBm each MAX2676, RF input = fO Q2.5MHz at -40dBm each +5 ANT In-Band Input IP3 RF input = fO Q2.5MHz at -25dBm each +30 2 -2 dB dB dBm dBm GPS/GNSS LNAs with Antenna Switch and Bias (VCC = 1.6V to 3.6V, fRFIN = 1575.42MHz, TA = -40NC to +85NC. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise noted.) (Note 2) PARAMETER Out-of-Band Input IP3 Input P2dB CONDITIONS MIN TYP MAX2674, RF input = 1713.42MHz, -17dBm and 1851.42MHz, -59dBm 3 MAX2676, RF input = 1713.42MHz, -17dBm and 1851.42MHz, -59dBm 5 MAX2674, fRFIN = 1580.42MHz -7 MAX2676, fRFIN = 1580.42MHz -4 MAX UNITS dBm dBm Input Return Loss 15 dB Output Return Loss 15 dB Reverse Isolation 45 dB ANT Insertion Loss 1.5 dB RFIN to ANT Isolation 45 dB Note 2: Guaranteed by test at TA = +25NC, guaranteed by design and characterization at TA = -40NC and TA = +85NC. Typical Operating Characteristics (MAX2674/MAX2676 EV Kit. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise specified.) -5 -10 25 20 ANTENNA -30 10 LNA 5 0 -10 -40 ANTENNA -30 LNA -40 -60 -70 -15 -45 ANTENNA -50 -5 -35 -20 |S12| (dB) -20 GAIN (dB) |S11| (dB) -10 15 -15 -25 0 MAX2674 toc02 LNA MAX2674 toc01 0 MAX2674 REVERSE ISOLATION vs. FREQUENCY MAX2674 GAIN vs. FREQUENCY MAX2674 toc03 MAX2674 INPUT RETURN LOSS vs. FREQUENCY 500 750 1000 1250 1500 1750 2000 2250 2500 500 750 1000 1250 1500 1750 2000 2250 2500 500 750 1000 1250 1500 1750 2000 2250 2500 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) 3 MAX2674/MAX2676 AC ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (MAX2674/MAX2676 EV Kit. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise specified.) MAX2674 ACTIVE PATH IN-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -30dBm/TONE) -5 32.0 MAX2674 toc05 0 MAX2674 toc04 0 MAX2674 ANTENNA PATH IN-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -10dBm/TONE) -40°C MAX2674 toc06 MAX2674 OUTPUT RETURN LOSS vs. FREQUENCY 31.5 -1 ANTENNA -15 LNA +85°C 31.0 +25°C IIP3 (dBm) IIP3 (dBm) -2 +25°C 30.5 30.0 -20 -3 -25 -4 -30 29.0 1.6 500 750 1000 1250 1500 1750 2000 2250 2500 1.8 2.0 2.2 2.4 2.6 2.8 +25°C -40°C 1.8 2.0 1 0 -6 +85°C -1 2.4 -5 INPUT P2dB (dBm) 2 2.2 2.6 -7 +85°C -8 -9 +25°C -10 -11 -12 -2 -40°C -13 -3 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 -14 3.2 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) MAX2674 ACTIVE PATH 2dB GAIN DESENSE vs. BLOCKER FREQUENCY MAX2676 INPUT RETURN LOSS vs. FREQUENCY 0 MAX2674 toc09 0 -1 LNA -5 -10 -2 3.2 -15 |S11| (dB) -3 -4 -5 -20 -25 -30 -6 -35 -7 -40 -8 2.8 SUPPLY VOLTAGE (V) -4 3 IIP3 (dBm) 1.6 MAX2674 ACTIVE PATH INPUT P2dB vs. SUPPLY VOLTAGE AND TEMPERATURE (TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz) MAX2674 toc07 5 BLOCKER POWER (dBm) 3.2 SUPPLY VOLTAGE (V) MAX2674 ACTIVE PATH OUT-OF-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz) 4 3.0 MAX2674 toc08 FREQUENCY (MHz) 4 -40°C 29.5 +85°C MAX2674 toc10 -10 |S22| (dB) MAX2674/MAX2676 GPS/GNSS LNAs with Antenna Switch and Bias ANTENNA -45 500 750 1000 1250 1500 1750 2000 2250 2500 500 750 1000 1250 1500 1750 2000 2250 2500 FREQUENCY (MHz) FREQUENCY (MHz) 3.0 3.2 GPS/GNSS LNAs with Antenna Switch and Bias (MAX2674/MAX2676 EV Kit. Typical values are at VCC = 3.3V, TA = +25NC, unless otherwise specified.) MAX2676 REVERSE ISOLATION vs. FREQUENCY -10 -20 10 |S12| (dB) 5 0 -10 LNA -40 ANTENNA -10 ANTENNA -20 LNA -30 -60 -15 -15 -25 -50 -5 -35 -40 -70 500 750 1000 1250 1500 1750 2000 2250 2500 500 750 1000 1250 1500 1750 2000 2250 2500 FREQUENCY (MHz) FREQUENCY (MHz) FREQUENCY (MHz) MAX2676 ACTIVE PATH IN-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -30dBm/TONE) MAX2676 ANTENNA PATH IN-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -10dBm/TONE) MAX2676 ACTIVE PATH OUT-OF-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz) +85°C 500 750 1000 1250 1500 1750 2000 2250 2500 8 31.5 6 IIP3 (dBm) -40°C 4.0 +25°C 3.5 30.5 IIP3 (dBm) 31.0 4.5 +25°C 30.0 2.0 2.2 2.4 2.6 2.8 3.0 3.2 1 1.6 1.8 SUPPLY VOLTAGE (V) 2.0 2.2 2.4 2.6 2.8 3.0 -3 1.8 2.0 +85°C -6 -7 -8 -40°C 2.2 2.4 2.6 2.8 3.0 3.2 SUPPLY VOLTAGE (V) 4 3 2 BLOCKER POWER (dBm) INPUT P2dB (dBm) -4 -10 1.6 MAX2676 ACTIVE PATH 2dB GAIN DESENSE vs. BLOCKER FREQUENCY MAX2674 toc17 -2 -9 3.2 SUPPLY VOLTAGE (V) MAX2676 ACTIVE PATH INPUT P2dB vs. SUPPLY VOLTAGE AND TEMPERATURE (TONE1 AT -27dBm/1713MHz, TONE2 AT -39dBm/1851MHz) -5 -40°C MAX2674 toc18 1.8 +25°C 2 29.0 1.6 4 -40°C 29.5 2.0 5 3 3.0 2.5 +85°C 7 +85°C MAX2674 toc16 5.5 5.0 32.0 MAX2674 toc14 6.0 IIP3 (dBm) -30 -5 MAX2674 toc15 GAIN (dB) 15 ANTENNA |S22| (dB) LNA 0 MAX2674 toc12 20 0 MAX2674 toc11 25 MAX2676 OUTPUT RETURN LOSS vs. FREQUENCY MAX2674 toc13 MAX2676 GAIN vs. FREQUENCY 1 0 -1 -2 -3 -4 +25°C -5 -11 -6 -12 1.6 1.8 2.0 2.2 2.4 2.6 2.8 SUPPLY VOLTAGE (V) 3.0 3.2 500 750 1000 1250 1500 1750 2000 2250 2500 FREQUENCY (MHz) 5 MAX2674/MAX2676 Typical Operating Characteristics (continued) GPS/GNSS LNAs with Antenna Switch and Bias MAX2674/MAX2676 Bump Configuration TOP VIEW MAX2674 MAX2676 VCC A1 A2 RFOUT/SHDN RFIN B1 B2 GNDAC GNDDC C1 C2 ANT Bump Description 6 PIN NAME A1 VCC FUNCTION A2 RFOUT/ SHDN B1 RFIN B2 GNDAC Ground for RF Circuits. Connect to the 2nd layer PCB ground plane with a via next to the pad. C1 GNDDC Ground for DC and Bias Circuits. Connect to the 2nd layer PCB ground plane with a via next to the pad. C2 ANT VCC. Place bypass capacitor as close as possible to the pin. RF Output and Shutdown Logic Input. Output match is included on-chip. Couple SHDN logic control through a 25kI resistor. DC logic-low shuts down the part. RF Input. Requires a DC-blocking capacitor and an external inductor matching component. Antenna Input GPS/GNSS LNAs with Antenna Switch and Bias The MAX2674/MAX2676 are low-power LNAs designed for GPS/GNSS receiver applications. The devices feature low noise and high linearity in an ultra-small package. They also include an antenna switch and circuitry supporting bias to accommodate external LNA applications. Input and Output Matching To achieve optimal performance in noise figure, gain, and IIP3, the devices require one matching inductor at RFIN in series with a DC-blocking capacitor. RFOUT/ SHDN is internally matched to 50I, eliminating the need for external matching components. At RFOUT/SHDN, an external DC-blocking capacitor should be used to isolate the shutdown control function. Shutdown Mode To place the device in shutdown mode, apply logic-low to RFOUT/SHDN through a 25kΩ resistor. An additional DC-blocking capacitor or component is required at RFOUT/SHDN in this case. Apply a logic-high state or no DC bias to turn the part permanently on. DC Supply Decoupling and Layout 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 a decoupling capacitor located close to the device. For long VCC lines, it may be necessary to add additional decoupling capacitors. Locate these additional capacitors further away from the device package. Proper grounding of GND_ pins is essential. If the PCB uses a top-side 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. Antenna Switch Control The MAX2674/MAX2676 ANT input includes an autodetection feature. When no current is drawn from ANT, the switch defaults to normal LNA operation. The pin can be directly connected to an external active antenna. The device automatically switches to the ANT input when an external active antenna is connected. Refer to www.maxim-ic.com for the MAX2674/MAX2676 EV Kit schematic, layout files, BOM information, and S-parameters. Table 1. MAX2674 Typical Noise Parameters (VCC = 2.85V, TA = +25°C) FREQUENCY (MHz) NFMIN (dB) 0.651 GAMMA_OPT MAG (°) 0.446 GAMMA_OPT PHASE (°) 44.1 Rn (I) 1550 1560 0.652 0.445 44.3 8.33 1570 0.654 0.445 44.6 8.32 1580 0.655 0.444 44.8 8.31 1590 0.656 0.444 45.1 8.3 1600 0.657 0.443 45.4 8.3 8.33 Table 2. MAX2676 Typical Noise Parameters (VCC = 2.85V, TA = +25°C) FREQUENCY (MHz) NFMIN (dB) 1550 0.744 1560 1570 GAMMA_OPT MAG (°) 0.441 GAMMA_OPT PHASE (°) 53.1 Rn (I) 0.746 0.44 53.4 8.68 0.748 0.439 53.7 8.66 1580 0.75 0.438 54 8.65 1590 0.751 0.437 54.3 8.63 1600 0.753 0.436 54.7 8.62 8.7 7 MAX2674/MAX2676 Detailed Description MAX2674/MAX2676 GPS/GNSS LNAs with Antenna Switch and Bias Chip Information PROCESS: SiGe BiCMOS Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may show a different suffix character, but the drawing pertains to the package regardless of RoHS status. PACKAGE TYPE 6 WLP 8 PACKAGE OUTLINE NO. CODE W61B1+1 21-0217 LAND PATTERN NO. Refer to Application Note 1891 GPS/GNSS LNAs with Antenna Switch and Bias REVISION NUMBER REVISION DATE 0 12/10 DESCRIPTION Initial release PAGES CHANGED — 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 © 2010 Maxim Integrated Products 9 Maxim is a registered trademark of Maxim Integrated Products, Inc. MAX2674/MAX2676 Revision History