EVALUATION KIT AVAILABLE MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier General Description The MAX2644 low-cost, high third-order intercept point (IP3) low-noise amplifier (LNA) is designed for applications in 2.4GHz WLAN, ISM, and Bluetooth radio systems. It features a programmable bias, allowing the input IP3 and supply current to be optimized for specific applications. The LNA provides up to +1dBm input IP3 while maintaining a low noise figure of 2.0dB and a typical gain of 16dB. The MAX2644 is designed on a low-noise, advanced silicon-germanium (SiGe) technology. It operates with a +2.7V to +5.5V single supply and is available in an ultrasmall 6-pin SC70 package. Applications RF INPUT L1 3.3nH Low-Power Standby Mode On-Chip Output Matching +2.7V to +5.5V Single-Supply Operation Ultra-Small 6-Pin SC70 Package BIAS PINPACKAGE MAX2644EXT+ -40C to +85C 6 SC70 AAG MAX2644EXT-T -40C to +85C 6 SC70 AAG MAX2644EXT+T -40C to +85C 6 SC70 AAG Pin Configuration RFIN TOP VIEW VCC BIAS RFOUT BIAS 1 6 RFOUT 5 GND 4 VCC RF OUTPUT GND 2 MAX2644 TOP MARK TEMP RANGE VCC GND 19-1786; Rev 2; 2/17 Adjustable IP3 and Bias Current PART Typical Operating Circuit C1 33pF High Gain: 16dB Ordering Information Bluetooth 802.11 WLAN Home RF Satellite CD Radio 2.4GHz ISM Band Radios 2.4GHz Cordless Phones Wireless Local Loop (WLL) RBIAS 1.2k Features Low Noise Figure (2.0dB at 2450MHz) MAX2644 RFIN 3 SC70-6 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Absolute Maximum Ratings VCC to GND.............................................................-0.3V to +6V RFIN, RFOUT to GND........................................................0.3V RFIN Power (50 source).................................................+5dBm BIAS to GND............................................................... 0 to +0.3V Operating Temperature Range............................ -40C to +85C Maximum Junction Temperature......................................+150C Continuous Power Dissipation (TA = +70C) 6-Pin SC70 (derate 3.1mW/C above +70C)..............245mW Storage Temperature......................................... -65C to +150C Lead Temperature (soldering, 10s).................................. +300C 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 = +2.7V to +5.5V, RBIAS = 1.2k, no RF signal applied, RFIN and RFOUT are AC-coupled and terminated to 50, TA = -40C to +85C. Typical values are at VCC = +3.0V, TA = +25 C, unless otherwise noted.) (Note 1) PARAMETER CONDITIONS Supply Voltage Operating Supply Current MIN RBIAS = 3.9k 2.7 RBIAS = 1.2k, TA = +25C 7.0 RBIAS = 1.2k, TA = -40C to +85C MAX UNITS 5.5 V 9.7 11.0 RBIAS = 750 Standby Supply Current TYP 2.7 mA 10.2 RBIAS is unconnected, TA = +25C, VCC = 3.3V 100 A AC ELECTRICAL CHARACTERISTICS (MAX2644 EV kit, VCC = +3.0V, fRFIN = 2450MHz, PRFIN = -30dBm, input and output are terminated to 50, RBIAS = 1.2k, TA = +25C, unless otherwise noted.) (Note 2) PARAMETER Operating Frequency CONDITIONS (Note 3) Gain (Note 4) Gain Variation Over Temperature Input Third-Order Intercept Point (Note 5) 15 TA = -40C to +85C TYP MAX UNITS 2500 MHz 17 0.7 RBIAS = 750 -4 RBIAS = 1.2k -3 RBIAS = 3.9k -8 Input 1dB Compression Point Noise Figure MIN 2400 dB 1.0 dBm -13 (Note 6) 2.0 dB dBm 2.5 dB Input Return Loss -15 dB Output Return Loss -10 dB Reverse Isolation -30 dB Note 1: Devices are production tested at TA = +25C. Minimum and maximum values are guaranteed by design and characterization over temperature and supply voltages. Note 2: Min/Max limits are guaranteed by design and characterization. Note 3: The part has been characterized at the specified frequency range. Operation outside this range is possible but not guaranteed. Note 4: Excluding PC board losses (0.3dB at the input and 0.3dB at the output of the MAX2644 EV kit). Note 5: Measured with two input tones (f1 = 2445MHz, f2 = 2455MHz) both at -30dBm per tone. Input IP3 can be improved to +1dBm with circuit shown in Figure 2. Note 6: Excluding PC board losses (0.3dB typical at the input of the MAX2644 EV kit). www.maximintegrated.com Maxim Integrated 2 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Typical Operating Characteristics (PRFIN = -30dBm, ZS = ZL = 50, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2k, TA = +25C, unless otherwise noted.) 8 6 TA = +25C TA = -40C 3.5 4.0 4.5 5.0 5.5 TA = -40C 0.5 1.0 1.5 13 2.0 2.5 3.0 3.5 12 4.0 4.0 TA = -40C 18 GAIN (dB) TA = +25C TA = -40C TA = +85C 16 TA = +25C 15 TA = +85C 14 0 -4 OUTPUT RETURN LOSS -6 -8 -10 -12 -14 -16 INPUT RETURN LOSS -18 2500 2600 13 2700 0.5 1.0 1.5 TA = +85C -45 2300 2400 2500 FREQUENCY (MHz) www.maximintegrated.com 2600 3.5 -20 4.0 2700 RBIAS = 1.2k 2.5 2.0 1.5 4.0 2600 2700 2.5 2.0 1.5 0.5 0.5 2450 2500 3.0 1.0 2400 2400 2500 FREQUENCY (MHz) 2550 RBIAS = 1.2k 3.5 1.0 2350 2300 NOISE FIGURE vs. TEMPERATURE 3.0 0 2200 FREQUENCY (MHz) NOSIE FIGURE (dB) TA = +25C 2200 3.5 NOSIE FIGURE (dB) TA = -40C -30 3.0 NOISE FIGURE vs. FREQUENCY 4.0 MAX2644 toc07 -25 2.5 RBIAS (k) REVERSE ISOLATION vs. FREQUENCY RBIAS = 1.2k 2.0 MAX2644 toc09 2400 MAX2644 toc08 2300 FREQUENCY (MHz) -40 5.5 RBIAS = 1.2k -2 11 -35 5.0 MAX2644 toc06 19 17 2200 4.5 INPUT AND OUTPUT RETURN LOSS vs. FREQUENCY 12 REVERSE ISOLATION (dB) 3.5 GAIN vs. RBIAS 13 -50 3.0 GAIN vs. FREQUENCY 16 -20 2.5 SUPPLY VOLTAGE (V) 17 10 TA = +85C TA = +25C RBIAS (k) 18 14 16 SUPPLY VOLTAGE (V) RBIAS = 1.2k 15 17 14 REVERSE ISOLATION (dB) 19 3.0 18 15 MAX2644 toc05 2.5 20 GAIN (dB) 5 1 MAX2644 toc04 0 TA = -40C 19 TA = +25C 7 3 2 20 TA = +85C 9 RBIAS = 1.2k 21 GAIN (dB) 10 4 11 GAIN vs. SUPPLY VOLTAGE 22 MAX2644 toc02 TA = +85C SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) MAX2644 toc01 RBIAS = 1.2k 12 SUPPLY CURRENT vs. RBIAS 13 MAX2644 toc03 SUPPLY CURRENT vs. SUPPLY VOLTAGE 14 0 -40 -15 10 35 60 85 TEMPERATURE (C) Maxim Integrated 3 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Typical Operating Characteristics (continued) (PRFIN = -30dBm, ZS = ZL = 50, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2k, TA = +25C, unless otherwise noted.) TA = +85C -2 -3 RBIAS = 1.2k -5 RBIAS = 3.9k -10 -5 -6 TA = -40C -7 -15 -20 -25 -20 -15 -10 -5 -9 0 -14 -15 -16 TA = +25C -17 TA = -40C -18 -8 -30 -13 TA = +25C -4 TA = +85C -12 INPUT P1dB (dBm) 0 INPUT P1dB vs. RBIAS -11 MAX2644 toc11 MAX2644 toc10 RBIAS = 750 IIP3 (dBm) OUTPUT POWER (dBm) 5 IIP3 vs. RBIAS -1 0.5 1.0 1.5 INPUT POWER (dBm) 2.0 2.5 RBIAS (k) 3.0 3.5 4.0 MAX2644 toc12 OUTPUT POWER vs. INPUT POWER 10 -19 0.5 1.0 1.5 2.0 2.5 RBIAS (k) 3.0 3.5 4.0 Pin Descriptions PIN NAME DESCRIPTION 1 BIAS Resistor Bias Control. Connect a resistor, RBIAS, from BIAS to ground. RBIAS sets IP3 and supply current. The current through this pin is approximately 60mV divided by RBIAS (see Applications Information). 2, 5 GND Ground. For optimum performance, provide a low-inductance connection to the ground plane. 3 RFIN Amplifier Input. AC-couple to this pin with a DC blocking capacitor. External matching network is required for optimum performance. 4 VCC Supply Voltage. Bypass with a capacitor directly to ground at the supply pin. Refer to VCC Line Bypassing section for more information. 6 RFOUT Amplifier Output. AC-coupled internally. R1 1.2k 1 BIAS RFOUT RFOUT 6 SMA U1 MAX2644 2 SMA C1 33pF RFIN L1 3.3nH 3 GND GND RFIN VCC GND 5 4 VCC Length = 400mils C3 2.2pF C2 33pF GAIN: 17dB IIP3: -3dBm Figure 1. High Gain Design www.maximintegrated.com Maxim Integrated 4 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier R1 1.2k 1 BIAS RFOUT L2 3.9nH 6 RFOUT SMA U1 MAX2644 2 SMA C1 33pF RFIN 3 GND GND RFIN VCC GND 5 4 VCC Length = 400mils C2 33pF C3 15pF L1 3.3nH GAIN: 16dB IIP3: +1dBm Figure 2. High Linearity Design BIAS BIAS MAX2644 MAX2644 (a) (b) Figure 3. Recommended MAX2644 Standby Configurations Applications Information Input Matching Input matching is required for optimum performance. The MAX2644 requires a simple LC matching network, as shown in the Typical Operating Circuit. To further reduce cost and external component count, replace the external inductor with a microstrip transmission line. The Typical Operating Circuit shows the recommended input matching network for the MAX2644 at 2450MHz. These values are optimized for best simultaneous gain, noise figure, and return loss performance. www.maximintegrated.com VCC Line Bypassing Bypassing the VCC line is necessary for optimum gain/ linearity performance. A transmission line and two capacitors are required, as shown in the schematics in Figures 1 and 2. The optimum dimensions and positions of the components are as follows: the output transmission line dimension is 0.532in (length) x 0.012in (width); the distance from C2 to the IC is 0.352in; and the distance from C3 to the IC is 0.041in. Please refer to Figures 1 and 2 for component values. Maxim Integrated 5 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Table 1. MAX2644 Typical Scattering Parameters (RBIAS = 750, VCC = +3.0V, TA = +25C.) FREQ. (MHz) S11 MAG S11 PHASE () S21 MAG S21 PHASE () S12 MAG S12 PHASE () S22 MAG S22 PHASE () 2200 0.3372 -79.36 5.1940 170.97 0.0414 157.19 0.2818 -73.71 2250 0.3098 -70.09 5.3156 166.79 0.0445 146.70 0.2204 -67.13 2300 0.3283 -57.20 5.4281 159.22 0.0469 130.62 0.1566 -50.26 2350 0.4005 -50.46 5.4175 150.70 0.0441 108.72 0.1480 -3.96 2400 0.4839 -50.28 5.3346 143.93 0.0349 85.67 0.2795 15.12 2450 0.5443 -56.33 5.0687 136.45 0.0233 58.80 0.4179 11.12 2500 0.5758 -60.09 4.9556 132.16 0.0113 27.74 0.5135 3.28 2550 0.5784 -63.61 4.5952 127.68 0.0041 -38.98 0.5622 -2.66 2600 0.5698 -66.56 4.2364 126.58 0.0063 -110.49 0.5986 -7.45 2650 0.5600 -68.51 4.1376 126.51 0.0103 -128.93 0.6208 -10.43 2700 0.5533 -69.86 4.0729 120.60 0.0133 -140.21 0.6425 -12.93 S12 MAG S12 PHASE () S22 MAG S22 PHASE () Table 2. MAX2644 Typical Scattering Parameters (RBIAS = 1.2k, VCC = +3.0V, TA = +25C.) FREQ. (MHz) S11 MAG S11 PHASE () S21 MAG S21 PHASE () 2200 0.3482 -67.06 5.2390 -177.33 0.0402 161.53 0.2873 -76.58 2250 0.3121 -58.60 5.3790 178.72 0.0435 151.97 0.2305 -69.42 2300 0.3051 -43.64 5.5982 173.43 0.0452 136.90 0.1735 -54.22 2350 0.3693 -30.34 5.8137 166.48 0.0427 116.57 0.1582 -16.42 2400 0.4769 -29.48 5.8063 158.29 0.0341 95.13 0.2687 6.52 2450 0.5619 -35.54 5.6624 150.06 0.0236 68.36 0.4043 5.00 2500 0.5948 -42.64 5.3015 142.37 0.0117 41.34 0.5030 -2.19 2550 0.5939 -47.58 4.7813 136.67 0.0034 -13.74 0.5602 -8.04 2600 0.5825 -50.94 4.3271 134.58 0.0056 -104.09 0.5952 -12.76 2650 0.5708 -53.14 4.1961 133.48 0.0096 -124.80 0.6215 -15.97 2700 0.5604 -54.35 4.1068 128.01 0.0125 -134.75 0.6434 -18.83 Standby Standby mode is achieved by disconnecting BIAS as shown in Figure 1. Avoid capacitance at the BIAS pin by connecting the bias resistor from BIAS to the switch. Layout Issues A properly designed PC board is essential to any RF/ microwave circuit. Use controlled impedance lines on all high-frequency inputs and outputs. Bypass with decoupling capacitors located close to the device VCC pin. For www.maximintegrated.com long VCC lines, it may be necessary to add additional decoupling capacitors. These additional capacitors can be located farther away from the device package. Proper grounding of the GND pins is essential. If the PC board uses a topside RF ground, connect it directly to all GND pins. For a board where the ground plane is not on the component layer, the best technique is to connect the GND pins to the board with a plated through-hole located close to the package. Maxim Integrated 6 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Table 3. MAX2644 Typical Scattering Parameters (RBIAS = 3.9k, VCC = +3.0V, TA = +25C.) FREQ. (MHz) S11 MAG S11 PHASE () S21 MAG S21 PHASE () S12 MAG S12 PHASE () S22 MAG S22 PHASE () 2200 0.4894 -75.32 3.7368 -173.73 0.0348 156.35 0.2729 -62.97 2250 0.4566 -72.73 3.7718 -177.51 0.0363 147.30 0.2459 -53.68 2300 0.4335 -68.17 3.8855 177.43 0.0369 132.32 0.2211 -41.12 2350 0.4343 -61.46 3.9783 171.34 0.0344 116.21 0.2177 -21.15 2400 0.4695 -57.00 4.0230 165.15 0.0272 95.31 0.2823 -2.41 2450 0.5156 -57.52 4.0087 157.68 0.0179 70.07 0.3924 1.25 2500 0.5403 -61.04 3.8380 149.58 0.0079 42.40 0.4849 -2.71 2550 0.5423 -63.93 3.5140 143.30 0.0018 -46.47 0.5476 -7.30 2600 0.5361 -66.30 3.2048 140.25 0.0055 -112.91 0.5881 -11.35 2650 0.5280 -68.08 3.1204 138.55 0.0100 -132.25 0.6170 -14.57 2700 0.5217 -69.29 3.0860 132.16 0.0121 -133.97 0.6418 -17.44 Table 4. MAX2644 Typical Noise Parameters at VCC = +3.0V, TA = +25C, RBIAS = 750 Table 5. MAX2644 Typical Noise Parameters at VCC = +3.0V, TA = +25C, RBIAS = 1.2k FREQUENCY (MHz) FMIN (dB) opt opt ANGLE RN () 2400 1.725 0.361 66.13 24.38 2400 1.570 0.409 69.84 21.77 2450 1.747 0.360 66.93 24.76 2450 1.589 0.408 70.63 21.94 2500 1.769 0.358 67.72 25.14 2500 1.609 0.406 71.63 22.42 Table 6. MAX2644 Typical Noise Parameters at VCC = +3.0V, TA = +25C, RBIAS = 3.9k FREQUENCY (MHz) FMIN (dB) opt opt ANGLE RN () 2400 1.497 0.510 86.55 20.58 2450 1.517 0.507 86.50 20.90 2500 1.538 0.504 88.18 21.25 www.maximintegrated.com FREQUENCY (MHz) FMIN (dB) opt opt ANGLE RN () Chip Information TRANSISTOR COUNT: 87 Maxim Integrated 7 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Package Information For the latest package outline information and land patterns (footprints), go to www.maximintegrated.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. www.maximintegrated.com Maxim Integrated 8 MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier Revision History REVISION NUMBER REVISION DATE DESCRIPTION PAGES CHANGED 2 2/17 Added MAX2644EXT+, MAX2644EXT-T, and MAX2644EXT-T to Ordering Information table 1 For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642, or visit Maxim Integrated's website at www.maximintegrated.com. Maxim Integrated cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim Integrated product. No circuit patent licenses are implied. Maxim Integrated reserves the right to change the circuitry and specifications without notice at any time. The parametric values (min and max limits) shown in the Electrical Characteristics table are guaranteed. Other parametric values quoted in this data sheet are provided for guidance. Maxim Integrated and the Maxim Integrated logo are trademarks of Maxim Integrated Products, Inc. (c) 2017 Maxim Integrated Products, Inc. 9 Mouser Electronics Authorized Distributor Click to View Pricing, Inventory, Delivery & Lifecycle Information: Maxim Integrated: MAX2644EXT+T MAX2644EXT-T