19-1786; Rev 1; 11/03 KIT ATION EVALU E L B A AVAIL 2.4GHz SiGe, High IP3 Low-Noise Amplifier 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 ultra-small 6-pin SC70 package. Features Low Noise Figure (2.0dB at 2450MHz) High Gain: 16dB Adjustable IP3 and Bias Current Low-Power Standby Mode On-Chip Output Matching +2.7V to +5.5V Single-Supply Operation Ultra-Small 6-Pin SC70 Package Ordering Information ________________________Applications Bluetooth PART TEMP RANGE PINPACKAGE MAX2644EXT-T -40C to +85C 6 SC70 802.11 WLAN Home RF TOP MARK AAG Satellite CD Radio 2.4GHz ISM Band Radios 2.4GHz Cordless Phones Wireless Local Loop (WLL) Pin Configuration Typical Operating Circuit RBIAS 1.2k VCC BIAS BIAS BIAS 1 C1 33pF RFIN RF INPUT TOP VIEW VCC RFOUT RF OUTPUT GND 2 L1 3.3nH MAX2644 RFIN 3 MAX2644 6 RFOUT 5 GND 4 VCC SC70-6 GND ________________________________________________________________ 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 MAX2644 General Description 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) TA = -40C to +85C TYP 2400 15 MAX UNITS 2500 MHz 1.0 dB 17 0.7 RBIAS = 750 -4 RBIAS = 1.2k -3 RBIAS = 3.9k -8 Input 1dB Compression Point Noise Figure MIN dB dBm -13 (Note 6) 2.0 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). 2 _______________________________________________________________________________________ 2.4GHz SiGe, High IP3 Low-Noise Amplifier SUPPLY CURRENT vs. RBIAS 6 TA = -40C 3.0 3.5 4.0 4.5 5.0 12 1.0 1.5 2.0 2.5 3.0 3.5 4.0 2.5 3.5 4.0 TA = -40C GAIN (dB) 15 TA = +85C TA = +25C 16 TA = +25C 15 12 RBIAS = 1.2k -4 OUTPUT RETURN LOSS -6 -8 -10 -12 -14 -16 TA = +85C 14 MAX2644 toc06 18 11 INPUT RETURN LOSS -18 13 2400 2500 2600 -20 0.5 2700 1.0 1.5 2.0 2.5 3.0 3.5 4.0 2200 REVERSE ISOLATION vs. FREQUENCY RBIAS = 1.2k 3.5 TA = -40C TA = +85C 2300 2400 2500 FREQUENCY (MHz) 2600 2700 2700 RBIAS = 1.2k 3.0 2.5 2.0 1.5 2.5 2.0 1.5 1.0 1.0 0.5 0.5 -45 -50 2600 3.5 NOSIE FIGURE (dB) NOSIE FIGURE (dB) TA = +25C 2500 NOISE FIGURE vs. TEMPERATURE 4.0 3.0 -30 2400 FREQUENCY (MHz) NOISE FIGURE vs. FREQUENCY 4.0 MAX2644 toc07 RBIAS = 1.2k -25 2200 2300 RBIAS (k) FREQUENCY (MHz) MAX2644 toc08 2300 MAX2644 toc09 10 5.5 0 -2 REVERSE ISOLATION (dB) MAX2644 toc04 19 17 16 -40 5.0 INPUT AND OUTPUT RETURN LOSS vs. FREQUENCY TA = -40C -35 4.5 GAIN vs. RBIAS 13 REVERSE ISOLATION (dB) 3.0 GAIN vs. FREQUENCY 17 GAIN (dB) 13 SUPPLY VOLTAGE (V) RBIAS = 1.2k 2200 TA = +85C TA = +25C RBIAS (k) 18 -20 16 SUPPLY VOLTAGE (V) 20 14 17 14 TA = -40C 0.5 5.5 18 15 MAX2644 toc05 2.5 19 5 1 0 TA = -40C 19 TA = +25C 7 3 2 20 TA = +85C 9 RBIAS = 1.2k 21 GAIN (dB) 8 TA = +25C 11 SUPPLY CURRENT (mA) SUPPLY CURRENT (mA) TA = +85C 10 GAIN vs. SUPPLY VOLTAGE 22 MAX2644 toc02 MAX2644 toc01 RBIAS = 1.2k 12 4 13 MAX2644 toc03 SUPPLY CURRENT vs. SUPPLY VOLTAGE 14 0 0 2350 2400 2450 FREQUENCY (MHz) 2500 2550 -40 -15 10 35 60 85 TEMPERATURE (C) _______________________________________________________________________________________ 3 MAX2644 Typical Operating Characteristics (PRFIN = -30dBm, ZS = ZL = 50, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2k, TA = +25C, unless otherwise noted.) Typical Operating Characteristics (continued) (PRFIN = -30dBm, ZS = ZL = 50, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2k, TA = +25C, unless otherwise noted.) IIP3 vs. RBIAS RBIAS = 750 TA = +85C -2 -3 -5 IIP3 (dBm) RBIAS = 1.2k RBIAS = 3.9k -10 -13 TA = +25C -4 -5 -6 TA = -40C -7 TA = +85C -12 INPUT P1dB (dBm) 0 -11 MAX2644 toc11 MAX2644 toc10 5 INPUT P1dB vs. RBIAS -1 MAX2644 toc12 OUTPUT POWER vs. INPUT POWER 10 OUTPUT POWER (dBm) MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier -14 -15 TA = +25C -16 -17 TA = -40C -15 -8 -18 -9 -20 -30 -25 -20 -15 -10 -5 -19 0.5 0 1.0 INPUT POWER (dBm) 1.5 2.0 3.0 2.5 RBIAS (k) 3.5 4.0 0.5 1.0 1.5 2.0 2.5 RBIAS (k) 3.0 3.5 4.0 Pin Description 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. RFOUT 1 BIAS R1 1.2k C1 33pF SMA L1 3.3nH 6 SMA U1 2 RFIN RFOUT GND MAX2644 GND GND 5 VCC Length = 400mils 3 RFIN VCC 4 C3 2.2pF C2 33pF GAIN: 17dB IIP3: -3dBm Figure 1. High Gain Design 4 _______________________________________________________________________________________ 2.4GHz SiGe, High IP3 Low-Noise Amplifier BIAS RFOUT R1 1.2k C1 33pF SMA RFOUT SMA U1 2 RFIN L2 3.9nH 6 MAX2644 1 3 GND MAX2644 RFIN GND VCC GND 5 4 C2 33pF C3 15pF L1 3.3nH VCC Length = 400mils GAIN: 16dB IIP3: +1dBm Figure 2. High Linearity Design BIAS BIAS MAX2644 (a) MAX2644 (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. VCC Line Bypassing Bypassing the V CC 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) 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. _______________________________________________________________________________________ 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 (DEGREES) S21 MAG S21 PHASE (DEGREES) S12 MAG S12 PHASE (DEGREES) S22 MAG S22 PHASE (DEGREES) 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 Table 2. MAX2644 Typical Scattering Parameters (RBIAS = 1.2k, VCC = +3.0V, TA = +25C.) FREQ. (MHz) S11 MAG S11 PHASE (DEGREES) S21 MAG S21 PHASE (DEGREES) S12 MAG S12 PHASE (DEGREES) S22 MAG S22 PHASE (DEGREES) 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 6 pin. For 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. _______________________________________________________________________________________ 2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644 Table 3. MAX2644 Typical Scattering Parameters (RBIAS = 3.9k, VCC = +3.0V, TA = +25C.) FREQ. (MHz) S11 MAG S11 PHASE (DEGREES) S21 MAG S21 PHASE (DEGREES) S12 MAG S12 PHASE (DEGREES) S22 MAG S22 PHASE (DEGREES) 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 () 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 Chip Information TRANSISTOR COUNT: 87 _______________________________________________________________________________________ 7 Package Information (continued) (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information go to www.maxim-ic.com/packages.) SC70, 6L.EPS MAX2644 2.4GHz SiGe, High IP3 Low-Noise Amplifier 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) 2003 Maxim Integrated Products Printed USA is a registered trademark of Maxim Integrated Products.