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| 19-4956; Rev 0; 9/09 KIT ATION EVALU BLE AVAILA GPS/GNSS Low-Noise Amplifiers General Description Features High-Power Gain: 19dB (MAX2657) Ultra-Low-Noise Figure: 0.8dB Integrated 50 Output Matching Circuit Low Supply Current: 4.1mA (MAX2657) Wide Supply Voltage Range: 1.6V to 3.3V Low Bill of Materials: One Inductor, Two Capacitors Small Footprint: 0.86mm x 1.26mm Thin Profile: 0.65mm 0.4mm-Pitch Wafer-Level Package (WLP) MAX2657/MAX2658 The MAX2657/MAX2658 high-gain, low-noise amplifiers (LNAs) are designed for GPS L1, Galileo, and GLONASS applications. Designed in Maxim's advanced SiGe process, the devices achieve a high gain and an ultra-low-noise figure while maximizing the input-referred 1dB compression point and the 3rd-order intercept point. The MAX2657/MAX2658 operate from a +1.6V to +3.3V single supply. The MAX2657 is optimized for low current. The MAX2658 is optimized for high linearity. The shutdown feature in the device reduces the supply current to be less than 1A. The MAX2657/MAX2658 are available in a very small, lead-free, RoHS-compliant, 0.86mm x 1.26mm x 0.65mm, wafer-level package (WLP). Applications Automotive Navigation Location-Enabled Mobile Devices Telematics (Asset Tracking and Management) Personal Navigation Devices (PNDs) Cellular Phones with GPS Notebook PCs/Ultra-Mobile PCs Recreational, Marine Navigation Avionics Watches Ordering Information PART MAX2657EWT+T TEMP RANGE -40C to +85C PIN-PACKAGE 6 WLP MAX2658EWT+T -40C to +85C 6 WLP +Denotes a lead(Pb)-free/RoHS-compliant package. T = Tape and reel. Pin Configuration/Typical Application Circuit + SHDN A1 MAX2657 MAX2658 BIAS A2 RFOUT RF OUTPUT VCC C1 RF INPUT L1 RFIN B1 B2 VCC C2 GND C1 C2 GND L1 = 6.2nH (MAX2657) C1 = 820pF (MAX2657) C2 = 33nF L1 = 2.7nH (MAX2658) C1 = 1500pF (MAX2658) ________________________________________________________________ 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. GPS/GNSS Low-Noise Amplifiers MAX2657/MAX2658 ABSOLUTE MAXIMUM RATINGS VCC to GND ...........................................................-0.3V to +3.6V Other Pins to GND .................-0.3V to (+ Operating VCC + 0.3V) Maximum RF Input Power ...............................................+5dBm Continuous Power Dissipation (TA = +70C) 6-Bump WLP (derates 10.5mW/C above +70C) ........840mW Maximum Current into RF Input ..........................................10mA Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10s)..........Reflow Profile (Note 1) 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 (MAX2657/MAX2658 EV kit. VCC = 1.6V to 3.3V, TA = -40C to +85C, no RF signals are applied. Typical values are at VCC = 2.85V and TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Supply Voltage Supply Current Digital Input Logic-High Digital Input Logic-Low Digital Input Current SHDN = high Shutdown mode, SHDN = low 1.2 0.45 1 MAX2657 MAX2658 CONDITIONS MIN 1.6 TYP 2.85 4.1 7.7 1 MAX 3.3 UNITS V mA A V V A AC ELECTRICAL CHARACTERISTICS (MAX2657/MAX2658 EV kit. VCC = 1.6V to 3.3V, TA = -40C to +85C, fRFIN = 1575.42MHz. Typical values are at VCC = 2.85V and TA = +25C, unless otherwise noted.) (Note 2) PARAMETER RF Frequency L1 band VCC = 2.85V Power Gain VCC = 1.6V Noise Figure In-Band 3rd-Order Input Intercept (Note 3) Point Out-of-Band 3rd-Order Input Intercept Point (Note 4) MAX2657 MAX2658 MAX2657 MAX2658 VCC = 1.8V VCC = 3.3V MAX2657 MAX2658 MAX2657 MAX2658 CONDITIONS MIN TYP 1575.42 19.5 17.7 19.4 17.6 0.8 0.8 -3.5 +4.5 +2.5 +8 dB dBm dBm dB MAX UNITS MHz 2 _______________________________________________________________________________________ GPS/GNSS Low-Noise Amplifiers AC ELECTRICAL CHARACTERISTICS (continued) (MAX2657/MAX2658 EV kit. VCC = 1.6V to 3.3V, TA = -40C to +85C, fRFIN = 1575.42MHz. Typical values are at VCC = 2.85V and TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Input 1dB Compression point Input Return Loss Output Return Loss Reverse Isolation (Note 5) CONDITIONS MAX2657 MAX2658 MIN TYP -12.5 -10 10 15 30 MAX UNITS dBm dB dB dB MAX2657/MAX2658 Note 2: Note 3: Note 4: Note 5: Min and max limits guaranteed by test at TA = +85C and guaranteed by design and characterization at TA = -40C and TA = +25C. Measured with the two tones located at 1MHz and 2MHz offset from the center of the GPS band with -30dBm/tone for MAX2657 and -27dBm/tone for MAX2658. Measured with input tones at 1713MHz (-25dBm) and 1851MHz (-49dBm). Measured with a tone located at 5MHz offset from the center of the GPS band. Typical Operating Characteristics (MAX2657/MAX2658 EV kit. Typical values are at VCC = 2.85V, TA = +25C, and fRFIN = 1575.42MHz, unless otherwise noted.) INPUT RETURN LOSS vs. FREQUENCY MAX2657 toc01 GAIN vs. FREQUENCY MAX2657 toc02 REVERSE ISOLATION vs. FREQUENCY MAX2657 toc03 0 -5 -10 MAX2658 25 MAX2657 20 15 GAIN (dB) 10 5 0 -5 -10 MAX2658 -20 -30 -40 -50 -60 -70 500 1000 1500 FREQUENCY (MHz) 2000 MAX2658 |S11| (dB) -15 -20 -25 -30 -35 500 1000 1500 FREQUENCY (MHz) 2000 2500 MAX2657 |S12| (dB) MAX2657 500 1000 1500 FREQUENCY (MHz) 2000 2500 2500 _______________________________________________________________________________________ 3 GPS/GNSS Low-Noise Amplifiers MAX2657/MAX2658 Typical Operating Characteristics (continued) (MAX2657/MAX2658 EV kit. Typical values are at VCC = 2.85V, TA = +25C, and fRFIN = 1575.42MHz, unless otherwise noted.) MAX2657 IN-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -35dBm/TONE) MAX2657 toc04 MAX2657 toc05 OUTPUT RETURN LOSS vs. FREQUENCY 0 -5 -10 MAX2658 -15 -20 -25 500 1000 1500 FREQUENCY (MHz) 2000 2500 0 -1 -2 MAX2658 IN-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TWO TONES LOCATED AT 1MHz AND 2MHz OFFSET WITH -30dBm/TONE) MAX2657 toc06 8 MAX2657 6 IIP3 (dBm) -40C 4 +25C +25C 2 +85C 0 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) IIP3 (dBm) |S22| (dB) -40C -3 -4 +85C -5 MAX2657 OUT-OF-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TONE 1 AT 1713MHz, -25dBm; TONE 2 AT 1851MHz, -49dBm) MAX2657 toc07 MAX2658 OUT-OF-BAND IIP3 vs. SUPPLY VOLTAGE AND TEMPERATURE (TONE 1 AT 1713MHz, -25dBm; TONE 2 AT 1851MHz, -49dBm) MAX2657 toc08 3 10 9 +85C 8 IIP3 (dBm) 7 6 +25C 2 IIP3 (dBm) +85C 1 -40C +25C 0 5 -1 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 SUPPLY VOLTAGE (V) 4 1.6 -40C 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 SUPPLY VOLTAGE (V) 4 _______________________________________________________________________________________ GPS/GNSS Low-Noise Amplifiers Typical Operating Characteristics (continued) (MAX2657/MAX2658 EV kit. Typical values are at VCC = 2.85V, TA = +25C, and fRFIN = 1575.42MHz, unless otherwise noted.) MAX2657/MAX2658 MAX2657 INPUT P1dB COMPRESSION vs. SUPPLY VOLTAGE AND TEMPERATURE MAX2657 toc09 MAX2658 INPUT P1dB COMPRESSION vs. SUPPLY VOLTAGE AND TEMPERATURE MAX2657 toc10 -11 -12 INPUT P1dB (dBm) -13 -14 -15 -16 -17 -18 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 -40C +85C +25C -9 -10 INPUT P1dB (dBm) -11 -12 -13 -40C -14 +85C +25C 3.2 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) _______________________________________________________________________________________ 5 GPS/GNSS Low-Noise Amplifiers MAX2657/MAX2658 Pin Description BUMP A1 A2 B1 B2 C1, C2 NAME SHDN RFOUT RFIN VCC GND FUNCTION Shutdown Input. A logic-low disables the device. RF Output. RFOUT is internally matched to 50 and incorporates an internal DC-blocking capacitor. RF Input. Requires a DC-blocking capacitor and external matching components. Supply Voltage. Bypass to ground with a 33nF capacitor as close as possible to the IC. Ground. Connect to the PCB ground plane. Detailed Description The MAX2657/MAX2658 are LNAs designed for GPS L1, Galileo, and GLONASS applications. The devices feature a power-shutdown control mode to eliminate the need for an external supply switch. The devices achieve a high gain and an ultra-low-noise figure. Shutdown The MAX2657/MAX2658 include a shutdown feature to turn off the entire chip. Apply a logic-high to the 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 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. Input and Output Matching The MAX2657/MAX2658 require an off-chip input matching. Only an inductor in series with a DC-blocking capacitor is needed to form the input matching circuit. The Typical Application Circuit shows the recommended input-matching network. These values are optimized for the best simultaneous gain, noise figure, and return loss performance. Tables 1 and 2 list typical device S parameters and K f values. The MAX2657/MAX2658 integrate an on-chip output matching to 50 at the output, eliminating the need for external matching components. The value of the input coupling capacitor affects IIP3. A smaller coupling capacitor results in lower IIP3. Table 1. MAX2657 Typical S-Parameter Values and K-Factor FREQ. (MHz) 1000 1100 1200 1300 1400 1500 1575 1600 1700 1800 1900 2000 S11 MAG (dB) -2.0 -2.1 -2.2 -2.4 -2.7 -6.5 -4.3 -4.6 -5.4 -5.2 -4.8 -4.5 S11 PHASE (Degrees) -47.7 -48.6 -51.6 -55.0 -58.6 -61.9 -62.3 -61.6 -55.3 -49.8 -47.3 -46.7 S21 MAG (dB) 6.0 7.4 9.6 12.0 14.0 16.2 17.1 17.3 17.1 15.7 13.9 12.7 S21 PHASE (Degrees) -100.0 -100.6 -107.3 -117.2 -129.5 -146.5 -164.2 -170.6 165.5 145.8 135.2 127.3 S12 MAG (dB) -47.5 -45.7 -42.9 -39.6 -37.0 -34.1 -32.9 -32.8 -32.5 -33.8 -35.2 -36.7 S12 PHASE (Degrees) -148.0 -150.0 -153.5 -160.2 -168.5 178.5 162.8 156.6 136.5 121.6 113.8 109.6 S22 MAG (dB) -1.0 -1.0 -1.4 -2.1 -3.6 -7.4 -15.3 -20.6 -9.5 -4.5 -2.7 -1.8 S22 PHASE (Degrees) -55.0 -58.1 -65.4 -74.1 -85.5 -100.0 -100.8 -78.9 10.0 -2.4 -13.2 -21.2 Kf 5.1 3.8 3.1 2.5 2.3 2.8 2.1 2.0 1.8 1.6 1.6 1.5 6 _______________________________________________________________________________________ GPS/GNSS Low-Noise Amplifiers Table 2. MAX2658 Typical S-Parameter Values and K-Factor FREQ. (MHz) 1000 1100 1200 1300 1400 1500 1575 1600 1700 1800 1900 2000 S11 MAG (dB) -3.0 -3.3 -3.5 -3.8 -4.3 -4.9 -5.3 -5.4 -5.5 -5.3 -5.1 -4.9 S11 PHASE (Degrees) -57.0 -58.2 -60.0 -62.3 -63.3 -62.0 -59.7 -58.5 -53.7 -50.3 -48.0 -46.3 S21 MAG (dB) 10.8 11.6 13.4 14.9 15.9 16.6 16.6 16.5 15.8 14.7 13.4 12.7 S21 PHASE (Degrees) -120.0 -124.5 -134.6 -148.0 -162.3 -178.9 168.0 163.9 149.3 136.8 130.0 123.9 S12 MAG (dB) -43.0 -42.1 -39.3 -37.2 -35.4 -33.9 -33.5 -33.6 -33.6 -34.2 -35.1 -35.8 S12 PHASE (Degrees) -154.0 -155.0 -160.5 -168.3 -178.2 171.0 161.7 157.5 148.3 142.5 139.6 138.6 S22 MAG (dB) -1.3 -1.6 -2.4 -4.0 -7.3 -14.5 -19.6 -16.7 -9.0 -5.7 -4.0 -3.0 S22 PHASE (Degrees) -65.0 -70.2 -79.6 -90.0 -101.0 -100.6 -26.0 -6.0 3.6 -2.8 -9.6 -15.0 Kf 3.2 3.3 2.8 2.7 2.7 2.6 2.5 2.5 2.3 2.2 2.3 2.1 MAX2657/MAX2658 Table 3. MAX2657 Typical Noise Parameters (VCC = 2.85V, TA = +25C) FREQUENCY (MHz) 1550 1560 1570 1575 1580 1590 1600 FMIN (dB) 0.68 0.68 0.68 0.68 0.68 0.68 0.68 |OPT| 0.44 0.44 0.44 0.44 0.44 0.44 0.44 |OPT| ANGLE 47.7 48.1 48.3 48.5 48.6 48.9 49.2 RN () 8.39 8.38 8.37 8.36 8.36 8.35 8.34 Table 4. MAX2658 Typical Noise Parameters (VCC = 2.85V, TA = +25C) FREQUENCY (MHz) 1550 1560 1570 1575 1580 1590 1600 FMIN (dB) 0.68 0.68 0.68 0.68 0.68 0.69 0.69 |OPT| 0.28 0.28 0.28 0.28 0.28 0.28 0.28 |OPT| ANGLE 88.0 88.4 88.8 89.0 89.2 89.6 90.0 RN () 4.48 4.48 4.48 4.48 4.48 4.47 4.47 _______________________________________________________________________________________ 7 GPS/GNSS Low-Noise Amplifiers MAX2657/MAX2658 Chip Information PROCESS: SiGe BiCMOS PACKAGE TYPE 6 WLP Package Information For the latest package outline information and land patterns, go to www.maxim-ic.com/packages. PACKAGE CODE W61B1+1 DOCUMENT NO. 21-0217 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. 8 _____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 (c) 2009 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc. |
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