19-1384; Rev 1; 2/99 KIT ATION EVALU SHEET A T A D WS FOLLO 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers 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. Features ♦ Wide Operating Frequency Range MAX2640: 400MHz to 1500MHz MAX2641: 1400MHz to 2500MHz ♦ Low Noise Figure MAX2640: 0.9dB at 900MHz MAX2641: 1.2dB at 1575MHz 1.3dB at 1900MHz 1.5dB at 2450MHz ♦ High Gain MAX2640: 15.1dB at 900MHz MAX2641: 15.7dB at 1575MHz 14.4dB at 1900MHz 13.5dB at 2450MHz ♦ High Reverse Isolation MAX2640: 40dB at 900MHz MAX2641: 31dB at 1575MHz 30dB at 1900MHz 24dB at 2450MHz ♦ +2.7V to +5.5V Single-Supply Operation ♦ Low 3.5mA Supply Current ♦ Ultra-Small SOT23-6 Package Applications Ordering Information 400MHz/900MHz/2.4GHz ISM Radios Cellular/PCS Handsets GPS Receivers Cordless Phones Wireless LANs PART TEMP. RANGE PINPACKAGE SOT TOP MARK MAX2640EUT-T -40°C to +85°C 6 SOT23-6 AAAV MAX2641EUT-T -40°C to +85°C 6 SOT23-6 AAAW Pin Configuration appears at end of data sheet. Wireless Data Typical Operating Circuits VCC C4 VCC C3 C2 C3 C4 C1 VALUE VALUE VALUE VALUE (pF) (pF) (pF) MAX2640 MAX2641 (pF) FREQUENCY (MHz) BIAS GENERATOR RFIN C1 C2 Z1 RFIN ZM1 LNA RF OUT RF OUT MAX2640/1 GND ZM2 900 — 470 3 470 — — 1575 100 100 470 — 1900 470 100 470 — 2450 470 100 470 Z1* ZM1 VALUE VALUE (nH) (pF) ZM2 VALUE 9.85 2 — — 5.6 1 6.8nH — 2.55 1 1pF 100 1.65 1 1pF *The series inductor Z1 can be replaced by a transmission line of appropriate impedance and electrical length. ________________________________________________________________ Maxim Integrated Products 1 For free samples & the latest literature: http://www.maxim-ic.com, or phone 1-800-998-8800. For small orders, phone 1-800-835-8769. MAX2640/MAX2641 General Description MAX2640/MAX2641 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers ABSOLUTE MAXIMUM RATINGS VCC to GND .............................................................-0.3V to +6V RFIN Power (50Ω source) (Note 1) ..................................+5dBm Continuous Power Dissipation (TA = +70°C) SOT23-6 (derate 8.7mW/°C above +70°C)..................696mW Operating Temperature Range ...........................-40°C to +85°C Maximum Junction Temperature .....................................+150°C Storage Temperature Range .............................-65°C to +160°C Lead Temperature (soldering, 10sec) .............................+300°C 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 = +25°C.) PARAMETER CONDITIONS Operating Supply Voltage Operating Supply Current MIN TYP 2.7 TA = +25°C 3.5 TA = -40°C to +85°C MAX UNITS 5.5 V 4.7 6.4 mA RF ELECTRICAL CHARACTERISTICS (VCC = +3.0V, PRFIN = -34dBm, ZO = 50Ω, TA = +25°C, unless otherwise noted.) (Notes 2 and 3) PARAMETER CONDITIONS MIN TYP MAX UNITS 1500 MHz MAX2640 (fRFIN = 900MHz) RFIN Frequency Range 400 Gain 12.8 Gain Variation Over Temperature TA = TMIN to TMAX Noise Figure (Note 4) 15.1 dB 0.6 1.7 dB 0.9 1.1 dB Input Return Loss -11 dB Output Return Loss -14 dB Reverse Isolation 40 dB Input 1dB Gain Compression Point -22 dBm -10 dBm Input Third-Order Intercept Point (Note 5) MAX2641 (fRFIN = 1900MHz) RFIN Frequency Range 1400 Gain 12.4 Gain Variation Over Temperature TA = TMIN to TMAX Noise Figure (Note 4) 2500 14.4 MHz dB 0.9 2.4 dB 1.3 1.5 dB Input Return Loss -12 dB Output Return Loss -12 dB Reverse Isolation 30 dB Input 1dB Gain Compression Point -21 dBm -4 dBm Input Third-Order Intercept Point 2 (Note 6) _______________________________________________________________________________________ 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers (VCC = +3.0V, PRFIN = -34dBm, ZO = 50Ω, TA = +25°C, unless otherwise noted.) (Notes 2 and 3) PARAMETER CONDITIONS MIN TYP MAX UNITS MAX2641 (fRFIN = 1575MHz) Gain Noise Figure 15.7 dB 1.2 dB Input Return Loss (Note 4) -8 dB Output Return Loss -15 dB Reverse Isolation -31 dB Input 1dB Gain Compression Point -21 dBm +1.4 dBm 13.5 dB 1.5 dB Input Return Loss -10 dB Output Return Loss -11 dB Reverse Isolation -24 dB Input 1dB Gain Compression Point -19 dBm -2.5 dBm Input Third-Order Intercept Point (Note 7) MAX2641 (fRFIN = 2450MHz) Gain Noise Figure (Note 4) Input Third-Order Intercept Point (Note 8) 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 = +25°C, unless otherwise noted.) MAX2640 SUPPLY CURRENT vs. SUPPLY VOLTAGE TA = -40°C TA = +85°C TA = +25°C 3 TA = -40°C NOISE FIGURE (dB) 15 GAIN (dB) ICC (mA) 4 TA = +25°C 14 TA = +85°C 2 MAX2640-03 5 3 MAX2640-01 16 MAX2640-01 6 MAX2640 MATCHED AT 900MHz NOISE FIGURE vs. FREQUENCY MAX2640 MATCHED AT 900MHz GAIN vs. FREQUENCY TA = +85°C 2 TA = +25°C 1 13 TA = -40°C 1 0 0 12 2 3 4 VCC (V) 5 6 800 840 880 920 FREQUENCY (MHz) 960 1000 800 840 880 920 960 1000 FREQUENCY (MHz) _______________________________________________________________________________________ 3 MAX2640/MAX2641 RF ELECTRICAL CHARACTERISTICS (continued) Typical Operating Characteristics (continued) (VCC = +3V, PRFIN = -34dBm, Typical Operating Circuits, TA = +25°C, unless otherwise noted.) -10 -9 REVERSE ISOLATION (dB) -8 INPUT RETURN LOSS -10 -11 -12 -13 -14 -15 6 5 TA = +85°C -20 4 TA = +25°C ICC (mA) -7 MAX2641 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX2640-05 0 MAX2640-04 -6 MAX2640 MATCHED AT 900MHz REVERSE ISOLATION vs. FREQUENCY MAX2640-06 MAX2640 MATCHED AT 900MHz INPUT RETURN LOSS AND OUTPUT RETURN LOSS vs. FREQUENCY RETURN LOSS (dB) -30 3 -40 2 -50 1 TA = -40°C OUTPUT RETURN LOSS -16 0 -60 800 850 900 950 1000 800 840 FREQUENCY (MHz) 880 920 960 1000 2 4 NOISE FIGURE (dB) 14 TA = +25°C MAX2640-08 3 MAX2640-07 TA = -40°C 15 TA = +85°C 5 VCC (V) MAX2641 MATCHED AT 1900MHz NOISE FIGURE vs. FREQUENCY 16 GAIN (dB) 3 FREQUENCY (MHz) MAX2641 MATCHED AT 1900MHz GAIN vs. FREQUENCY TA = +85°C 2 TA = +25°C 1 TA = -40°C 13 0 12 1800 1840 1880 1920 1960 1800 2000 1840 1880 1920 1960 2000 FREQUENCY (MHz) FREQUENCY (MHz) MAX2641 MATCHED AT 1900MHz INPUT RETURN LOSS AND OUTPUT RETURN LOSS vs. FREQUENCY MAX2641 MATCHED AT 1900MHz REVERSE ISOLATION vs. FREQUENCY -7 -9 -10 INPUT RETURN LOSS -11 -12 -13 -10 REVERSE ISOLATION (dB) -8 OUTPUT RETURN LOSS -14 MAX2640-10 0 MAX2640-09 -6 RETURN LOSS (dB) MAX2640/MAX2641 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers -20 -30 -40 -50 -15 -60 -16 1800 1850 1900 FREQUENCY (MHz) 4 1950 2000 1800 1840 1880 1920 1960 FREQUENCY (MHz) _______________________________________________________________________________________ 2000 6 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers PIN NAME FUNCTION 1 RFIN Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching network (see Typical Operating Circuit). 2, 3, 5 GND Ground. For optimum performance, provide a low inductance connection to the ground plane. 4 RFOUT 6 VCC 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). 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. _______________________________________________________________________________________ 5 MAX2640/MAX2641 Pin Description MAX2640/MAX2641 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers Table 1. MAX2640 Typical Scattering Parameters at VCC = +3V, TA = +25°C FREQUENCY (MHz) S11 MAG PHASE S21 MAG PHASE S12 MAG PHASE S22 MAG PHASE 400 0.907 -35.1 4.62 109.1 0.001 13.5 0.302 108.4 500 0.882 -43.1 4.70 90.4 0.001 64.7 0.33 93.6 600 0.858 -50.8 4.76 70.7 0.001 55.2 0.352 81.5 700 0.832 -58.1 4.80 50.6 0.002 39.4 0.365 69.4 800 0.810 -64.9 4.85 29.5 0.004 64.2 0.384 56.8 900 0.788 -71.0 4.77 9.2 0.005 36.3 0.396 44.7 1000 0.771 -76.6 4.74 -12.0 0.007 28.0 0.412 33.5 1100 0.749 -82.3 4.55 -32.4 0.010 12.3 0.436 21.9 1200 0.735 -88.0 4.48 -53.4 0.013 -10.6 0.455 10.7 1300 0.720 -93.4 4.24 -75.9 0.015 -28.2 0.469 -0.2 1400 0.702 -98.8 4.17 -94.9 0.021 -42.9 0.482 -9.9 1500 0.688 -104.9 3.81 -117.5 0.024 -59.8 0.489 -20.2 Table 2. MAX2641 Typical Scattering Parameters at VCC = +3V, TA = +25°C FREQUENCY (MHz) S11 MAG PHASE S21 MAG 1500 0.734 -75.5 1600 0.717 -80.3 1700 0.695 1800 1900 6 PHASE S12 MAG PHASE S22 MAG PHASE 4.397 -90.5 0.013 -80.3 0.535 17.7 4.209 -109.8 0.016 -91.9 0.514 8.6 -85.3 4.193 -131.6 0.018 -116.5 0.513 -0.5 0.678 -90.6 3.876 -150.0 0.021 -128.7 0.510 -10.6 0.661 -96.6 3.801 -173.5 0.023 -150.6 0.493 -21.6 2000 0.646 -102.6 3.456 166.9 0.026 -166.6 0.470 -32.0 2100 0.632 -108.8 3.302 146.4 0.028 171.7 0.431 -43.4 2200 0.620 -114.0 2.981 123.6 0.029 150.7 0.403 -56.1 2300 0.610 -119.4 2.781 105.3 0.033 132.2 0.374 -69.4 2400 0.604 -124.6 2.430 82.9 0.032 111.2 0.338 -86.2 2500 0.603 -128.4 2.118 64.7 0.030 95.7 0.316 -98.3 _______________________________________________________________________________________ 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641 Table 3. MAX2640 Typical Noise Parameters at VCC = +3V, TA = +25°C FREQUENCY (MHz) fMIN (dB) Γ opt Γ opt ANGLE RN (Ω) 400 0.66 0.56 21 12.5 500 0.69 0.54 25 11.9 600 0.72 0.51 30 11.3 700 0.75 0.48 35 10.8 800 0.78 0.46 40 10.2 900 0.82 0.43 45 9.7 1000 0.85 0.40 50 9.3 1100 0.89 0.37 56 8.8 1200 0.93 0.35 62 8.3 1300 0.97 0.32 68 7.9 1400 1.01 0.29 77 7.4 1500 1.06 0.26 84 7.0 Table 4. MAX2641 Typical Noise Parameters at VCC = +3V, TA = +25°C FREQUENCY (MHz) fMIN (dB) Γ opt Γ opt ANGLE RN (Ω) 1500 1.02 0.43 44 12.4 1600 1.05 0.40 47 11.8 1700 1.08 0.38 50 11.3 1800 1.10 0.36 54 10.8 1900 1.14 0.32 58 10.3 2000 1.17 0.30 62 9.9 2100 1.20 0.28 66 9.4 2200 1.23 0.25 71 9.0 2300 1.27 0.22 77 8.6 2400 1.30 0.19 82 8.3 2500 1.34 0.17 91 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. _______________________________________________________________________________________ 7 400MHz to 2500MHz SiGe Ultra-Low-Noise Amplifiers MAX2640/MAX2641 Pin Configuration TOP VIEW RFIN 1 GND 2 MAX2640 MAX2641 GND 3 6 VCC 5 GND 4 RFOUT SOT23-6 6LSOT.EPS Package Information 8 _______________________________________________________________________________________