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19-1384; Rev 1; 2/99
KIT ATION EVALU HEET DATA S WS FOLLO
400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers
Features
o Wide Operating Frequency Range MAX2640: 400MHz to 1500MHz MAX2641: 1400MHz to 2500MHz o Low Noise Figure MAX2640: 0.9dB at 900MHz MAX2641: 1.2dB at 1575MHz 1.3dB at 1900MHz 1.5dB at 2450MHz o High Gain MAX2640: 15.1dB at 900MHz MAX2641: 15.7dB at 1575MHz 14.4dB at 1900MHz 13.5dB at 2450MHz o High Reverse Isolation MAX2640: 40dB at 900MHz MAX2641: 31dB at 1575MHz 30dB at 1900MHz 24dB at 2450MHz o +2.7V to +5.5V Single-Supply Operation o Low 3.5mA Supply Current o Ultra-Small SOT23-6 Package
General Description
The MAX2640/MAX2641 are low-cost, ultra-low-noise amplifiers designed for applications in the cellular, PCS, GPS, and 2.4GHz ISM frequency bands. Operating from a single +2.7V to +5.5V supply, these devices consume only 3.5mA of current while providing a low noise figure, high gain, high input IP3, and an operating frequency range that extends from 400MHz to 2500MHz. The MAX2640 is optimized for 400MHz to 1500MHz applications, with a typical performance of 15.1dB gain, input IP3 of -10dBm, and a noise figure of 0.9dB at 900MHz. The MAX2641 is optimized for 1400MHz to 2500MHz applications, with a typical performance of 14.4dB gain, an input IP3 of -4dBm, and a noise figure of 1.3dB at 1900MHz. These devices are internally biased, eliminating the need for external bias resistors and chokes. In a typical application, the only external components needed are a two-element input match, input and output blocking capacitors, and a VCC bypass capacitor. The MAX2640/MAX2641 are designed on a high-frequency, low-noise, advanced silicon-germanium process and are offered in the space-saving 6-pin SOT23 package.
MAX2640/MAX2641
Applications
400MHz/900MHz/2.4GHz ISM Radios Cellular/PCS Handsets GPS Receivers Cordless Phones Wireless LANs Wireless Data
PART MAX2640EUT-T MAX2641EUT-T
Ordering Information
TEMP. RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 6 SOT23-6 SOT TOP MARK AAAV AAAW
Pin Configuration appears at end of data sheet.
Typical Operating Circuits
VCC VCC BIAS GENERATOR RFIN C1 Z1 RFIN ZM1 LNA RF OUT C2 RF OUT ZM2 C4 C3 C2 C3 C4 C1 VALUE VALUE VALUE VALUE (pF) (pF) (pF) MAX2640 MAX2641 (pF) FREQUENCY (MHz) 900 -- -- -- GND -- 1575 1900 2450 470 100 470 470 3 100 100 100 470 470 470 470 -- -- -- 100 Z1* ZM1 VALUE VALUE (nH) (pF) 9.85 5.6 2.55 1.65 2 1 1 1 ZM2 VALUE -- 6.8nH 1pF 1pF
MAX2640/1
*The series inductor Z1 can be replaced by a transmission line of appropriate impedance and electrical length.
________________________________________________________________ Maxim Integrated Products
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641
ABSOLUTE MAXIMUM RATINGS
VCC to GND .............................................................-0.3V to +6V RFIN Power (50 source) (Note 1) ..................................+5dBm Continuous Power Dissipation (TA = +70C) SOT23-6 (derate 8.7mW/C above +70C)..................696mW Operating Temperature Range ...........................-40C to +85C Maximum Junction Temperature .....................................+150C Storage Temperature Range .............................-65C to +160C Lead Temperature (soldering, 10sec) .............................+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.
Note 1: Pin must be AC-coupled with a DC blocking capacitor.
DC ELECTRICAL CHARACTERISTICS
(VCC = +2.7V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3.0V, TA = +25C.) PARAMETER Operating Supply Voltage Operating Supply Current TA = +25C TA = -40C to +85C CONDITIONS MIN 2.7 3.5 TYP MAX 5.5 4.7 6.4 UNITS V mA
RF ELECTRICAL CHARACTERISTICS
(VCC = +3.0V, PRFIN = -34dBm, ZO = 50, TA = +25C, unless otherwise noted.) (Notes 2 and 3) PARAMETER MAX2640 (fRFIN = 900MHz) RFIN Frequency Range Gain Gain Variation Over Temperature Noise Figure Input Return Loss Output Return Loss Reverse Isolation Input 1dB Gain Compression Point Input Third-Order Intercept Point MAX2641 (fRFIN = 1900MHz) RFIN Frequency Range Gain Gain Variation Over Temperature Noise Figure Input Return Loss Output Return Loss Reverse Isolation Input 1dB Gain Compression Point Input Third-Order Intercept Point (Note 6) TA = TMIN to TMAX (Note 4) 1400 12.4 14.4 0.9 1.3 -12 -12 30 -21 -4 2.4 1.5 2500 MHz dB dB dB dB dB dB dBm dBm (Note 5) TA = TMIN to TMAX (Note 4) 400 12.8 15.1 0.6 0.9 -11 -14 40 -22 -10 1.7 1.1 1500 MHz dB dB dB dB dB dB dBm dBm CONDITIONS MIN TYP MAX UNITS
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers
RF ELECTRICAL CHARACTERISTICS (continued)
(VCC = +3.0V, PRFIN = -34dBm, ZO = 50, TA = +25C, unless otherwise noted.) (Notes 2 and 3) PARAMETER MAX2641 (fRFIN = 1575MHz) Gain Noise Figure Input Return Loss Output Return Loss Reverse Isolation Input 1dB Gain Compression Point Input Third-Order Intercept Point MAX2641 (fRFIN = 2450MHz) Gain Noise Figure Input Return Loss Output Return Loss Reverse Isolation Input 1dB Gain Compression Point Input Third-Order Intercept Point (Note 8) (Note 4) 13.5 1.5 -10 -11 -24 -19 -2.5 dB dB dB dB dB dBm dBm (Note 7) (Note 4) 15.7 1.2 -8 -15 -31 -21 +1.4 dB dB dB dB dB dBm dBm CONDITIONS MIN TYP MAX UNITS
MAX2640/MAX2641
Note 2: Guaranteed by design and characterization. Note 3: Measured using typical operating circuit. Input and output impedance matching networks were optimized for best simultaneous gain and noise-figure performance. Note 4: External component and circuit losses degrade noise-figure performance. Specification excludes external component and circuit board losses. Note 5: Measured with two input tones, f1 = 899MHz, f2 = 901MHz, both at -34dBm per tone. Note 6: Measured with two input tones, f1 = 1899MHz, f2 = 1901MHz, both at -34dBm per tone. Note 7: Measured with two input tones, f1 = 1574MHz, f2 = 1576MHz, both at -34dBm per tone. Note 8: Measured with two input tones, f1 = 2449MHz, f2 = 2451MHz, both at -34dBm per tone.
Typical Operating Characteristics
(VCC = +3V, PRFIN = -34dBm, Typical Operating Circuits, TA = +25C, unless otherwise noted.)
MAX2640 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640-01
MAX2640 MATCHED AT 900MHz GAIN vs. FREQUENCY
TA = -40C 15 GAIN (dB) TA = +25C 14 TA = +85C
MAX2640-01
MAX2640 MATCHED AT 900MHz NOISE FIGURE vs. FREQUENCY
MAX2640-03
6 5 TA = +85C 4 ICC (mA) 3 2 TA = +25C TA = -40C
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NOISE FIGURE (dB)
2
TA = +85C
TA = +25C 1 TA = -40C
13 1 0 2 3 4 VCC (V) 5 6 12 800 840 880 920 960 1000 FREQUENCY (MHz) 0 800
840
880
920
960
1000
FREQUENCY (MHz)
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641
Typical Operating Characteristics (continued)
(VCC = +3V, PRFIN = -34dBm, Typical Operating Circuits, TA = +25C, unless otherwise noted.)
MAX2640 MATCHED AT 900MHz INPUT RETURN LOSS AND OUTPUT RETURN LOSS vs. FREQUENCY
MAX2640-04
MAX2640 MATCHED AT 900MHz REVERSE ISOLATION vs. FREQUENCY
MAX2640-05
MAX2641 SUPPLY CURRENT vs. SUPPLY VOLTAGE
MAX2640-06
-6 -7 -8
0 -10 REVERSE ISOLATION (dB) -20 -30 -40 -50
6 5 TA = +85C 4 ICC (mA) TA = +25C 3 2 1 0 TA = -40C
RETURN LOSS (dB)
-9 -10 -11 -12 -13 -14 -15 -16 800 850
INPUT RETURN LOSS
OUTPUT RETURN LOSS -60 900 FREQUENCY (MHz) 950 1000 800 840 880 920 960 1000 FREQUENCY (MHz) 2 3 4 VCC (V) 5 6
MAX2641 MATCHED AT 1900MHz GAIN vs. FREQUENCY
MAX2640-07
MAX2641 MATCHED AT 1900MHz NOISE FIGURE vs. FREQUENCY
MAX2640-08
16 TA = -40C 15 GAIN (dB)
3
NOISE FIGURE (dB)
TA = +85C 2
14 TA = +85C 13 TA = +25C
TA = +25C 1 TA = -40C
12 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz)
0 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz)
MAX2641 MATCHED AT 1900MHz INPUT RETURN LOSS AND OUTPUT RETURN LOSS vs. FREQUENCY
MAX2640-09
MAX2641 MATCHED AT 1900MHz REVERSE ISOLATION vs. FREQUENCY
MAX2640-10
-6 -7 -8 RETURN LOSS (dB) -9 -10 -11 -12 -13 -14 -15 -16 1800 1850 1900 FREQUENCY (MHz) 1950 OUTPUT RETURN LOSS INPUT RETURN LOSS
0 -10 REVERSE ISOLATION (dB) -20 -30 -40 -50 -60
2000
1800
1840
1880
1920
1960
2000
FREQUENCY (MHz)
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers
Pin Description
PIN 1 2, 3, 5 4 NAME RFIN GND RFOUT FUNCTION Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching network (see Typical Operating Circuit). Ground. For optimum performance, provide a low inductance connection to the ground plane. Amplifier Output. Use the recommended series blocking or matching capacitor (see Typical Operating Circuit). Supply Voltage. Bypass to ground directly at the supply pin. The value of the bypass capacitor is determined by the lowest operating frequency. Additional bypassing may be necessary for long VCC lines (see Typical Operating Circuit).
MAX2640/MAX2641
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VCC
Detailed Description
The MAX2640 and MAX2641 are ultra-low-noise amplifiers that operate with RF input frequency ranges of 400MHz to 1500MHz (MAX2640) or 1400MHz to 2500MHz (MAX2641). These devices are available in SOT23-6 packages and contain internal bias circuitry to minimize the number of required external components. Their small size and low external component count make them ideal for applications where board space is limited.
Applications Information
External Matching Components
The MAX2640/MAX2641 are easy to use, generally requiring only five external components as shown in the Typical Operating Circuit. To reduce external component count further, replace external inductors with microstrip transmission lines. The high reverse isolation allows the tuning of the input matching network without affecting the output match, and vice versa. Select input and output matching networks to obtain the desired combination of gain, noise figure, and return loss performance. The Typical Operating Circuits show the recommended input and output matching networks for the MAX2640/MAX2641 at 900MHz and 1900MHz, respectively. These values are optimized for best simultaneous gain, noise figure, and return loss performance. To aid in the design of matching networks for other frequencies, Tables 1 and 2 list typical device Sparameters and Tables 3 and 4 list typical device noise parameters.
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641
Table 1. MAX2640 Typical Scattering Parameters at VCC = +3V, TA = +25C
FREQUENCY (MHz) 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 S11 MAG 0.907 0.882 0.858 0.832 0.810 0.788 0.771 0.749 0.735 0.720 0.702 0.688 PHASE -35.1 -43.1 -50.8 -58.1 -64.9 -71.0 -76.6 -82.3 -88.0 -93.4 -98.8 -104.9 S21 MAG 4.62 4.70 4.76 4.80 4.85 4.77 4.74 4.55 4.48 4.24 4.17 3.81 PHASE 109.1 90.4 70.7 50.6 29.5 9.2 -12.0 -32.4 -53.4 -75.9 -94.9 -117.5 S12 MAG 0.001 0.001 0.001 0.002 0.004 0.005 0.007 0.010 0.013 0.015 0.021 0.024 PHASE 13.5 64.7 55.2 39.4 64.2 36.3 28.0 12.3 -10.6 -28.2 -42.9 -59.8 S22 MAG 0.302 0.33 0.352 0.365 0.384 0.396 0.412 0.436 0.455 0.469 0.482 0.489 PHASE 108.4 93.6 81.5 69.4 56.8 44.7 33.5 21.9 10.7 -0.2 -9.9 -20.2
Table 2. MAX2641 Typical Scattering Parameters at VCC = +3V, TA = +25C
FREQUENCY (MHz) 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 S11 MAG 0.734 0.717 0.695 0.678 0.661 0.646 0.632 0.620 0.610 0.604 0.603 PHASE -75.5 -80.3 -85.3 -90.6 -96.6 -102.6 -108.8 -114.0 -119.4 -124.6 -128.4 S21 MAG 4.397 4.209 4.193 3.876 3.801 3.456 3.302 2.981 2.781 2.430 2.118 PHASE -90.5 -109.8 -131.6 -150.0 -173.5 166.9 146.4 123.6 105.3 82.9 64.7 S12 MAG 0.013 0.016 0.018 0.021 0.023 0.026 0.028 0.029 0.033 0.032 0.030 PHASE -80.3 -91.9 -116.5 -128.7 -150.6 -166.6 171.7 150.7 132.2 111.2 95.7 S22 MAG 0.535 0.514 0.513 0.510 0.493 0.470 0.431 0.403 0.374 0.338 0.316 PHASE 17.7 8.6 -0.5 -10.6 -21.6 -32.0 -43.4 -56.1 -69.4 -86.2 -98.3
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641
Table 3. MAX2640 Typical Noise Parameters at VCC = +3V, TA = +25C
FREQUENCY (MHz) 400 500 600 700 800 900 1000 1100 1200 1300 1400 1500 fMIN (dB) 0.66 0.69 0.72 0.75 0.78 0.82 0.85 0.89 0.93 0.97 1.01 1.06 opt 0.56 0.54 0.51 0.48 0.46 0.43 0.40 0.37 0.35 0.32 0.29 0.26 opt ANGLE 21 25 30 35 40 45 50 56 62 68 77 84 RN () 12.5 11.9 11.3 10.8 10.2 9.7 9.3 8.8 8.3 7.9 7.4 7.0
Table 4. MAX2641 Typical Noise Parameters at VCC = +3V, TA = +25C
FREQUENCY (MHz) 1500 1600 1700 1800 1900 2000 2100 2200 2300 2400 2500 fMIN (dB) 1.02 1.05 1.08 1.10 1.14 1.17 1.20 1.23 1.27 1.30 1.34 opt 0.43 0.40 0.38 0.36 0.32 0.30 0.28 0.25 0.22 0.19 0.17 opt ANGLE 44 47 50 54 58 62 66 71 77 82 91 RN () 12.4 11.8 11.3 10.8 10.3 9.9 9.4 9.0 8.6 8.3 8.0
Layout and Power-Supply Bypassing
A properly designed PC board is essential to any RF/microwave circuit. Be sure to use controlled impedance lines on all high-frequency inputs and outputs. The power supply should be bypassed with decoupling capacitors located close to the device VCC pins. For long VCC lines, it may be necessary to add additional decoupling capacitors. These additional capacitors can be located further 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 side, the best technique is to connect the GND pin to the board with a plated through-hole close to the package.
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400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641
Pin Configuration
TOP VIEW
RFIN 1 6 VCC
GND 2
MAX2640 MAX2641
5
GND
GND 3
4
RFOUT
SOT23-6
Package Information
6LSOT.EPS
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