Download: KIT EVALUA TION HEET FOLLOW General Description Features

19-1384; Rev 1; 2/99 KIT EVALUA TION DATA S HEET FOLLOW S 400MHz to 2500MHz SiGe General Description Features The MAX2640/MAX2641 are low-cost, ultra-low-noise ♦ Wide Operating Frequency Range amplifiers designed for applications in the cellular, PCS, MAX2640: 400MHz to 1500MHz GPS, and 2.4GHz ISM frequency bands. Operating from MAX2641: 1400MHz to 2500MHz a single +2.7V to +5.5V supply, these devices consume only 3.5mA of current while providing a low noise fig- ♦ Low Noise Figure ure, high gain, high input IP3, and an operating fre- MAX2640: 0.9dB at 900MHz quency range that extends from 400...
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19-1384; Rev 1; 2/99

KIT EVALUA TION

DATA S

HEET FOLLOW

S 400MHz to 2500MHz SiGe

General Description Features

The MAX2640/MAX2641 are low-cost, ultra-low-noise ♦ Wide Operating Frequency Range amplifiers designed for applications in the cellular, PCS, MAX2640: 400MHz to 1500MHz GPS, and 2.4GHz ISM frequency bands. Operating from MAX2641: 1400MHz to 2500MHz a single +2.7V to +5.5V supply, these devices consume only 3.5mA of current while providing a low noise fig- ♦ Low Noise Figure ure, high gain, high input IP3, and an operating fre- MAX2640: 0.9dB at 900MHz quency range that extends from 400MHz to 2500MHz. MAX2641: 1.2dB at 1575MHz The MAX2640 is optimized for 400MHz to 1500MHz 1.3dB at 1900MHz applications, with a typical performance of 15.1dB gain, 1.5dB at 2450MHz input IP3 of -10dBm, and a noise figure of 0.9dB at ♦ High Gain 900MHz. The MAX2641 is optimized for 1400MHz to MAX2640: 15.1dB at 900MHz 2500MHz applications, with a typical performance of MAX2641: 15.7dB at 1575MHz 14.4dB gain, an input IP3 of -4dBm, and a noise figure 14.4dB at 1900MHz of 1.3dB at 1900MHz. 13.5dB at 2450MHz These devices are internally biased, eliminating the ♦ High Reverse Isolation need for external bias resistors and chokes. In a typical MAX2640: 40dB at 900MHz application, the only external components needed are a two-element input match, input and output blocking MAX2641: 31dB at 1575MHz capacitors, and a VCC bypass capacitor. 30dB at 1900MHz 24dB at 2450MHz The MAX2640/MAX2641 are designed on a high-fre- quency, low-noise, advanced silicon-germanium ♦ +2.7V to +5.5V Single-Supply Operation process and are offered in the space-saving 6-pin ♦ Low 3.5mA Supply Current SOT23 package. ♦ Ultra-Small SOT23-6 Package

Applications Ordering Information

400MHz/900MHz/2.4GHz ISM Radios Cellular/PCS Handsets TEMP. PIN- SOTPART RANGE PACKAGE TOP MARK GPS Receivers MAX2640EUT-T -40°C to +85°C 6 SOT23-6 AAAV Cordless Phones MAX2641EUT-T -40°C to +85°C 6 SOT23-6 AAAW Wireless LANs Pin Configuration appears at end of data sheet. Wireless Data

Typical Operating Circuits VCC

C4 C3 VCC C1 C2 C3 C4 FREQUENCY (MHz) Z1* ZM1VALUE VALUE VALUE VALUE VALUE VALUE ZM2 BIAS GENERATOR MAX2640 MAX2641 (pF) (pF) (pF) (pF) (nH) (pF) VALUE C1 RFIN Z1 C2 RF OUT 900 — 470 3 470 — 9.85 2 —

LNA

RFIN RF OUT — 1575 100 100 470 — 5.6 1 6.8nH ZM1 ZM2 MAX2640/1 — 1900 470 100 470 — 2.55 1 1pF — 2450 470 100 470 100 1.65 1 1pF GND *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.

,

ABSOLUTE MAXIMUM RATINGS

VCC to GND ...-0.3V to +6V Operating Temperature Range ...-40°C to +85°C RFIN Power (50Ω source) (Note 1) ...+5dBm Maximum Junction Temperature ...+150°C Continuous Power Dissipation (TA = +70°C) Storage Temperature Range ...-65°C to +160°C SOT23-6 (derate 8.7mW/°C above +70°C)...696mW 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 MIN TYP MAX UNITS Operating Supply Voltage 2.7 5.5 V TA = +25°C 3.5 4.7 Operating Supply Current mA TA = -40°C to +85°C 6.4

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 MAX2640 (fRFIN = 900MHz) RFIN Frequency Range 400 1500 MHz Gain 12.8 15.1 dB Gain Variation Over Temperature TA = TMIN to TMAX 0.6 1.7 dB Noise Figure (Note 4) 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 Input Third-Order Intercept Point (Note 5) -10 dBm MAX2641 (fRFIN = 1900MHz) RFIN Frequency Range 1400 2500 MHz Gain 12.4 14.4 dB Gain Variation Over Temperature TA = TMIN to TMAX 0.9 2.4 dB Noise Figure (Note 4) 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 Input Third-Order Intercept Point (Note 6) -4 dBm 2 _,

RF ELECTRICAL CHARACTERISTICS (continued)

(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 15.7 dB Noise Figure (Note 4) 1.2 dB Input Return Loss -8 dB Output Return Loss -15 dB Reverse Isolation -31 dB Input 1dB Gain Compression Point -21 dBm Input Third-Order Intercept Point (Note 7) +1.4 dBm MAX2641 (fRFIN = 2450MHz) Gain 13.5 dB Noise Figure (Note 4) 1.5 dB Input Return Loss -10 dB Output Return Loss -11 dB Reverse Isolation -24 dB Input 1dB Gain Compression Point -19 dBm Input Third-Order Intercept Point (Note 8) -2.5 dBm Note 2: Guaranteed by design and characterization. Note 3: Measured using typical operating circuit. Input and output impedance matching networks were optimized for best simulta- neous 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 MAX2640 MATCHED AT 900MHz MAX2640 MATCHED AT 900MHz SUPPLY CURRENT vs. SUPPLY VOLTAGE GAIN vs. FREQUENCY NOISE FIGURE vs. FREQUENCY 6 16 3 TA = -40°C TA = +85°C 15 TA = +85°C42TA = +25°C TA = +25°C 3 TA = -40°C 14 TA = +85°C TA = +25°C2113 TA = -40°C 0 12023456800 840 880 920 960 1000 800 840 880 920 960 1000 VCC (V) FREQUENCY (MHz) FREQUENCY (MHz) _ 3 ICC (mA) MAX2640-01 GAIN (dB) MAX2640-01 NOISE FIGURE (dB) MAX2640-03,

Typical Operating Characteristics (continued)

(VCC = +3V, PRFIN = -34dBm, Typical Operating Circuits, TA = +25°C, unless otherwise noted.) MAX2640 MATCHED AT 900MHz INPUT RETURN LOSS AND MAX2640 MATCHED AT 900MHz MAX2641 OUTPUT RETURN LOSS vs. FREQUENCY REVERSE ISOLATION vs. FREQUENCY SUPPLY CURRENT vs. SUPPLY VOLTAGE -606-7 -8 -10 5 -9 TA = +85°CINPUT RETURN LOSS -20 4 -10 TA = +25°C -11 -30 3 TA = -40°C -12 -13 -40 2 -14 -50 1 -15 OUTPUT RETURN LOSS -16 -60 0 800 850 900 950 1000 800 840 880 920 960 100023456FREQUENCY (MHz) FREQUENCY (MHz) VCC (V) MAX2641 MATCHED AT 1900MHz MAX2641 MATCHED AT 1900MHz GAIN vs. FREQUENCY NOISE FIGURE vs. FREQUENCY 16 3 TA = -40°C 15 TA = +85°C 14 TA = +25°C TA = +85°C TA = +25°C 1 13 TA = -40°C 12 0 1800 1840 1880 1920 1960 2000 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz) FREQUENCY (MHz) MAX2641 MATCHED AT 1900MHz INPUT RETURN LOSS AND MAX2641 MATCHED AT 1900MHz OUTPUT RETURN LOSS vs. FREQUENCY REVERSE ISOLATION vs. FREQUENCY -6 0 -7 -8 -10 -9 -20 -10 INPUT RETURN LOSS -11 -30 -12 -40 -13 OUTPUT RETURN LOSS -14 -50 -15 -16 -60 1800 1850 1900 1950 2000 1800 1840 1880 1920 1960 2000 FREQUENCY (MHz) FREQUENCY (MHz) 4 _ RETURN LOSS (dB) RETURN LOSS (dB) GAIN (dB) MAX2640-04 REVERSE ISOLATION (dB) MAX2640-09 MAX2640-07 REVERSE ISOLATION (dB) NOISE FIGURE (dB) MAX2640-05 ICC (mA) MAX2640-10 MAX2640-08 MAX2640-06,

Pin Description

PIN NAME FUNCTION Amplifier Input. AC-couple to this pin with a DC blocking capacitor. Use recommended input matching 1 RFIN network (see Typical Operating Circuit). 2, 3, 5 GND 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 4 RFOUT Circuit). Supply Voltage. Bypass to ground directly at the supply pin. The value of the bypass capacitor is deter- 6 VCC mined by the lowest operating frequency. Additional bypassing may be necessary for long VCC lines (see Typical Operating Circuit).

Detailed Description Applications Information

The MAX2640 and MAX2641 are ultra-low-noise ampli- External Matching Components fiers that operate with RF input frequency ranges of The MAX2640/MAX2641 are easy to use, generally 400MHz to 1500MHz (MAX2640) or 1400MHz to requiring only five external components as shown in the 2500MHz (MAX2641). These devices are available in Typical Operating Circuit. To reduce external compo- SOT23-6 packages and contain internal bias circuitry to nent count further, replace external inductors with minimize the number of required external components. microstrip transmission lines. The high reverse isolation Their small size and low external component count allows the tuning of the input matching network without make them ideal for applications where board space is affecting the output match, and vice versa. Select input limited. and output matching networks to obtain the desired combination of gain, noise figure, and return loss per- formance. The Typical Operating Circuits show the rec- ommended 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 perfor- mance. To aid in the design of matching networks for other frequencies, Tables 1 and 2 list typical device S- parameters and Tables 3 and 4 list typical device noise parameters. _ 5,

Table 1. MAX2640 Typical Scattering Parameters at VCC = +3V, TA = +25°C

FREQUENCY S11 S21 S12 S22 PHASE PHASE PHASE PHASE (MHz) MAG MAG MAG MAG 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 S11 S21 S12 S22 PHASE PHASE PHASE PHASE (MHz) MAG MAG MAG MAG 1500 0.734 -75.5 4.397 -90.5 0.013 -80.3 0.535 17.7 1600 0.717 -80.3 4.209 -109.8 0.016 -91.9 0.514 8.6 1700 0.695 -85.3 4.193 -131.6 0.018 -116.5 0.513 -0.5 1800 0.678 -90.6 3.876 -150.0 0.021 -128.7 0.510 -10.6 1900 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 6 _,

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 Proper grounding of the GND pins is essential. If the A properly designed PC board is essential to any PC board uses a topside RF ground, connect it directly RF/microwave circuit. Be sure to use controlled imped- to all GND pins. For a board where the ground plane is ance lines on all high-frequency inputs and outputs. not on the component side, the best technique is to The power supply should be bypassed with decoupling connect the GND pin to the board with a plated capacitors located close to the device VCC pins. For through-hole close to the package. long VCC lines, it may be necessary to add additional decoupling capacitors. These additional capacitors can be located further away from the device package. _ 7, Pin Configuration TOP VIEW RFIN16VCC MAX2640 GND 2 MAX2641 5 GND GND34RFOUT SOT23-6 Package Information8_6LSOT.EPS]
15

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