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19-1786; Rev 1; 11/03
KIT ATION EVALU ABLE AVAIL
2.4GHz SiGe, High IP3 Low-Noise Amplifier
General Description Features
o Low Noise Figure (2.0dB at 2450MHz) o High Gain: 16dB o Adjustable IP3 and Bias Current o Low-Power Standby Mode o On-Chip Output Matching o +2.7V to +5.5V Single-Supply Operation o Ultra-Small 6-Pin SC70 Package
MAX2644
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.
________________________Applications
Bluetooth 802.11 WLAN Home RF Satellite CD Radio 2.4GHz ISM Band Radios 2.4GHz Cordless Phones Wireless Local Loop (WLL)
MAX2644EXT-T PART
Ordering Information
TEMP RANGE -40C to +85C PINPACKAGE 6 SC70 TOP MARK AAG
Typical Operating Circuit
RBIAS 1.2k VCC BIAS BIAS VCC
Pin Configuration
TOP VIEW
C1 33pF RF INPUT L1 3.3nH RFIN RFOUT RF OUTPUT
BIAS 1
6
RFOUT
GND 2
MAX2644
5
GND
RFIN 3
4
VCC
MAX2644
GND
SC70-6
________________________________________________________________ Maxim Integrated Products
1
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.
2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644
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 Supply Voltage RBIAS = 3.9k Operating Supply Current RBIAS = 1.2k, TA = +25C RBIAS = 1.2k, TA = -40C to +85C RBIAS = 750 Standby Supply Current RBIAS is unconnected, TA = +25C, VCC = 3.3V 10.2 100 A CONDITIONS MIN 2.7 2.7 7.0 9.7 11.0 mA TYP MAX 5.5 UNITS V
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 Gain (Note 4) Gain Variation Over Temperature Input Third-Order Intercept Point (Note 5) Input 1dB Compression Point Noise Figure Input Return Loss Output Return Loss Reverse Isolation (Note 6) TA = -40C to +85C RBIAS = 750 RBIAS = 1.2k RBIAS = 3.9k (Note 3) CONDITIONS MIN 2400 15 17 0.7 -4 -3 -8 -13 2.0 -15 -10 -30 2.5 dBm dB dB dB dB dBm 1.0 TYP MAX 2500 UNITS MHz dB 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 MAX2644
Typical Operating Characteristics
(PRFIN = -30dBm, ZS = ZL = 50, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2k, TA = +25C, unless otherwise noted.)
SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2644 toc01
SUPPLY CURRENT vs. RBIAS
MAX2644 toc02
GAIN vs. SUPPLY VOLTAGE
21 20 19 GAIN (dB) 18 17 16 15 TA = +25C TA = +85C RBIAS = 1.2k
MAX2644 toc03
14 12
RBIAS = 1.2k TA = +85C
13 11 SUPPLY CURRENT (mA) 9 7 5 3 1 TA = -40C TA = +85C TA = +25C
22
SUPPLY CURRENT (mA)
10 8 6 4 2 0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 SUPPLY VOLTAGE (V) TA = +25C TA = -40C
TA = -40C
14 13 12 2.0 2.5 3.0 3.5 4.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5
0.5
1.0
1.5
RBIAS (k)
SUPPLY VOLTAGE (V)
GAIN vs. FREQUENCY
MAX2644 toc04
GAIN vs. RBIAS
MAX2644 toc05
INPUT AND OUTPUT RETURN LOSS vs. FREQUENCY
-2 -4 REVERSE ISOLATION (dB) -6 -8 -10 -12 -14 -16 -18 INPUT RETURN LOSS OUTPUT RETURN LOSS RBIAS = 1.2k
MAX2644 toc06
20 19 18 17 GAIN (dB) RBIAS = 1.2k TA = -40C
19 18 17 GAIN (dB) TA = -40C
0
16 15 14 13 12 11 10 2200 2300 2400 2500 2600 2700 FREQUENCY (MHz) TA = +25C TA = +85C
16 15 14 13 0.5
TA = +25C
TA = +85C
-20 1.0 1.5 2.0 2.5 3.0 3.5 4.0 2200 2300 2400 2500 2600 2700 RBIAS (k) FREQUENCY (MHz)
REVERSE ISOLATION vs. FREQUENCY
MAX2644 toc07
NOISE FIGURE vs. FREQUENCY
MAX2644 toc08
NOISE FIGURE vs. TEMPERATURE
RBIAS = 1.2k 3.5 3.0 NOSIE FIGURE (dB) 2.5 2.0 1.5 1.0 0.5 0 -40 -15 10 35 60 85
MAX2644 toc09
-20 -25 REVERSE ISOLATION (dB)
RBIAS = 1.2k
4.0 3.5 3.0 NOSIE FIGURE (dB) 2.5 2.0 1.5 1.0 0.5
4.0
RBIAS = 1.2k
TA = -40C -30 -35 -40 -45 -50 2200 2300 2400 2500 2600 2700 FREQUENCY (MHz) TA = +25C
TA = +85C
0 2350 2400 2450 FREQUENCY (MHz) 2500 2550
TEMPERATURE (C)
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3
2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644
Typical Operating Characteristics (continued)
(PRFIN = -30dBm, ZS = ZL = 50, VCC = +3.0V, fRFIN = 2450MHz, RBIAS = 1.2k, TA = +25C, unless otherwise noted.)
OUTPUT POWER vs. INPUT POWER
MAX2644 toc10
IIP3 vs. RBIAS
MAX2644 toc11
INPUT P1dB vs. RBIAS
-12 -13 INPUT P1dB (dBm) -14 -15 -16 -17 TA = -40C -18 -19 TA = +25C TA = +85C
MAX2644 toc12
10 5 OUTPUT POWER (dBm) 0 -5 -10 -15 -20 -30 -25 -20 -15 -10 -5 0 INPUT POWER (dBm)
-1 -2 -3 IIP3 (dBm) TA = +85C TA = +25C
-11
RBIAS = 750 RBIAS = 1.2k RBIAS = 3.9k
-4 -5 -6 -7 -8 -9 0.5 1.0 1.5 2.5 RBIAS (k) 2.0 3.0 3.5 4.0 TA = -40C
0.5
1.0
1.5
2.0 2.5 RBIAS (k)
3.0
3.5
4.0
Pin Description
PIN 1 2, 5 3 4 6 NAME BIAS GND RFIN VCC RFOUT DESCRIPTION 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). Ground. For optimum performance, provide a low-inductance connection to the ground plane. Amplifier Input. AC-couple to this pin with a DC blocking capacitor. External matching network is required for optimum performance. Supply Voltage. Bypass with a capacitor directly to ground at the supply pin. Refer to VCC Line Bypassing section for more information. Amplifier Output. AC-coupled internally.
RFOUT 1 R1 1.2k 2 BIAS U1 GND RFOUT 6 SMA
MAX2644
GND
5
GND
RFIN SMA L1 3.3nH
C1 33pF
Length = 400mils 3 RFIN VCC 4 C3 2.2pF C2 33pF
VCC
GAIN: 17dB IIP3: -3dBm
Figure 1. High Gain Design 4 _______________________________________________________________________________________
2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644
1 R1 1.2k 2 BIAS U1 GND RFOUT 6 L2 3.9nH RFOUT SMA
MAX2644
GND
5
GND
RFIN SMA L1 3.3nH
C1 33pF
3
RFIN
VCC
4
Length = 400mils C3 15pF C2 33pF
VCC
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.
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.
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5
2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644
Table 1. MAX2644 Typical Scattering Parameters (RBIAS = 750, VCC = +3.0V, TA = +25C.)
FREQ. (MHz) 2200 2250 2300 2350 2400 2450 2500 2550 2600 2650 2700 S11 MAG 0.3372 0.3098 0.3283 0.4005 0.4839 0.5443 0.5758 0.5784 0.5698 0.5600 0.5533 S11 PHASE (DEGREES) -79.36 -70.09 -57.20 -50.46 -50.28 -56.33 -60.09 -63.61 -66.56 -68.51 -69.86 S21 MAG 5.1940 5.3156 5.4281 5.4175 5.3346 5.0687 4.9556 4.5952 4.2364 4.1376 4.0729 S21 PHASE (DEGREES) 170.97 166.79 159.22 150.70 143.93 136.45 132.16 127.68 126.58 126.51 120.60 S12 MAG 0.0414 0.0445 0.0469 0.0441 0.0349 0.0233 0.0113 0.0041 0.0063 0.0103 0.0133 S12 PHASE (DEGREES) 157.19 146.70 130.62 108.72 85.67 58.80 27.74 -38.98 -110.49 -128.93 -140.21 S22 MAG 0.2818 0.2204 0.1566 0.1480 0.2795 0.4179 0.5135 0.5622 0.5986 0.6208 0.6425 S22 PHASE (DEGREES) -73.71 -67.13 -50.26 -3.96 15.12 11.12 3.28 -2.66 -7.45 -10.43 -12.93
Table 2. MAX2644 Typical Scattering Parameters (RBIAS = 1.2k, VCC = +3.0V, TA = +25C.)
FREQ. (MHz) 2200 2250 2300 2350 2400 2450 2500 2550 2600 2650 2700 S11 MAG 0.3482 0.3121 0.3051 0.3693 0.4769 0.5619 0.5948 0.5939 0.5825 0.5708 0.5604 S11 PHASE (DEGREES) -67.06 -58.60 -43.64 -30.34 -29.48 -35.54 -42.64 -47.58 -50.94 -53.14 -54.35 S21 MAG 5.2390 5.3790 5.5982 5.8137 5.8063 5.6624 5.3015 4.7813 4.3271 4.1961 4.1068 S21 PHASE (DEGREES) -177.33 178.72 173.43 166.48 158.29 150.06 142.37 136.67 134.58 133.48 128.01 S12 MAG 0.0402 0.0435 0.0452 0.0427 0.0341 0.0236 0.0117 0.0034 0.0056 0.0096 0.0125 S12 PHASE (DEGREES) 161.53 151.97 136.90 116.57 95.13 68.36 41.34 -13.74 -104.09 -124.80 -134.75 S22 MAG 0.2873 0.2305 0.1735 0.1582 0.2687 0.4043 0.5030 0.5602 0.5952 0.6215 0.6434 S22 PHASE (DEGREES) -76.58 -69.42 -54.22 -16.42 6.52 5.00 -2.19 -8.04 -12.76 -15.97 -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) 2200 2250 2300 2350 2400 2450 2500 2550 2600 2650 2700 S11 MAG 0.4894 0.4566 0.4335 0.4343 0.4695 0.5156 0.5403 0.5423 0.5361 0.5280 0.5217 S11 PHASE (DEGREES) -75.32 -72.73 -68.17 -61.46 -57.00 -57.52 -61.04 -63.93 -66.30 -68.08 -69.29 S21 MAG 3.7368 3.7718 3.8855 3.9783 4.0230 4.0087 3.8380 3.5140 3.2048 3.1204 3.0860 S21 PHASE (DEGREES) -173.73 -177.51 177.43 171.34 165.15 157.68 149.58 143.30 140.25 138.55 132.16 S12 MAG 0.0348 0.0363 0.0369 0.0344 0.0272 0.0179 0.0079 0.0018 0.0055 0.0100 0.0121 S12 PHASE (DEGREES) 156.35 147.30 132.32 116.21 95.31 70.07 42.40 -46.47 -112.91 -132.25 -133.97 S22 MAG 0.2729 0.2459 0.2211 0.2177 0.2823 0.3924 0.4849 0.5476 0.5881 0.6170 0.6418 S22 PHASE (DEGREES) -62.97 -53.68 -41.12 -21.15 -2.41 1.25 -2.71 -7.30 -11.35 -14.57 -17.44
Table 4. MAX2644 Typical Noise Parameters at VCC = +3.0V, TA = +25C, RBIAS = 750
FREQUENCY (MHz) 2400 2450 2500 FMIN (dB) 1.725 1.747 1.769 opt 0.361 0.360 0.358 opt ANGLE 66.13 66.93 67.72 RN () 24.38 24.76 25.14
Table 5. MAX2644 Typical Noise Parameters at VCC = +3.0V, TA = +25C, RBIAS = 1.2k
FREQUENCY (MHz) 2400 2450 2500 FMIN (dB) 1.570 1.589 1.609 opt 0.409 0.408 0.406 opt ANGLE 69.84 70.63 71.63 RN () 21.77 21.94 22.42
Table 6. MAX2644 Typical Noise Parameters at VCC = +3.0V, TA = +25C, RBIAS = 3.9k
FREQUENCY (MHz) 2400 2450 2500 FMIN (dB) 1.497 1.517 1.538 opt 0.510 0.507 0.504 opt ANGLE 86.55 86.50 88.18 RN () 20.58 20.90 21.25
Chip Information
TRANSISTOR COUNT: 87
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7
2.4GHz SiGe, High IP3 Low-Noise Amplifier MAX2644
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
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.

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