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| 19-4797; Rev 0; 2/99 L MANUA ION KIT ALUAT DATA SHEET EV WS FOLLO 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs General Description Features o +2.7V to +5.5V Supply Range o Input Frequency Range High: 10MHz to 500MHz (MAX2470/2471) Low: 10MHz to 200MHz (MAX2470) o >14dB Power Gain at 200MHz o 64dB Typical Reverse Isolation at 200MHz o Low-Distortion Output Drive o Ultra-Small SOT23-6 Package o High Input Impedance o Single-Ended (MAX2470) or Differential (MAX2471) Inputs MAX2470/MAX2471 The MAX2470/MAX2471 are flexible, low-cost, highreverse-isolation buffer amplifiers for applications with discrete and module-based VCO designs. Both feature differential 50 outputs for driving a single differential (balanced) load or two separate single-ended (unbalanced) 50 loads. The MAX2470 offers a single-ended input and has two selectable frequency ranges of operation: 10MHz to 500MHz and 10MHz to 200MHz. The MAX2471 offers a differential input and operates from 10MHz to 500MHz. The MAX2470/MAX2471 also feature high input impedance for maximum flexibility, enabling them to be used with a variety of oscillator topologies. High reverse isolation combined with low supply current make them ideal for applications requiring high performance with low power. These devices are also ideal for use as active baluns. The MAX2470 converts a single-ended input to a differential output. The MAX2471 is useful as a differential buffer stage or to convert from a differential input to two single-ended outputs. The MAX2470 operates from a single +2.7V to +5.5V supply. At -5dBm output power, it consumes 5.5mA in the high-frequency range and only 3.6mA in the low-frequency range. The MAX2471 operates from a +2.7V to +5.5V single supply and consumes 5.5mA. Both devices are available in ultra-small SOT23-6 plastic packages, requiring minimal board space. Ordering Information PART MAX2470EUT-T MAX2471EUT-T TEMP. RANGE -40C to +85C -40C to +85C PINPACKAGE 6 SOT23-6 6 SOT23-6 SOT TOP MARK AAAX AAAY Typical Operating Circuits VCC HI/LO Applications Cellular and PCS Mobile Phones ISM-Band Applications Active Baluns General-Purpose Buffers/Amplifiers BIAS MAX2470 OUT IN OUT 50 Pin Configuration GND 50 TOP VIEW OUT 1 6 VCC VCC BIAS GND 2 MAX2471 OUT 50 MAX2470 MAX2471 5 IN IN OUT 3 4 HI/LO (IN) IN OUT 50 SOT23-6 ( ) ARE FOR MAX2471 GND ________________________________________________________________ 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. 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs MAX2470/MAX2471 ABSOLUTE MAXIMUM RATINGS VCC to GND ..............................................................-0.3V to +7V IN to GND......-0.3V to (VCC + 0.3V) or 3.7V (whichever is lower) IN to IN ..................................................................-2.2V to +2.2V HI/LO to GND .............................................-0.3V to (VCC + 0.3V) Continuous Power Dissipation SOT23-6 (derate 8.7mW/C above +70C)...................696mW Operating Temperature Range ...........................-40C to +85C Junction Temperature ......................................................+150C Storage Temperature Range .............................-65C to +150C 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. DC ELECTRICAL CHARACTERISTICS (Typical Operating Circuit, VCC = +2.7V to +5.5V, TA = TMIN to TMAX, unless otherwise noted. Typical values are at VCC = +3V, TA = +25C.) (Note 1) PARAMETER Supply Voltage Range SYMBOL VCC No signal HI/LO = VCC Supply Current ICC No signal HI/LO = GND HI/LO Input Level High HI/LO Input Level Low HI/LO Input Bias Current VIH VIL IIN VHI/LO = GND or VCC -10 POUT = -5dBm, RLOAD = 100 diff. No signal POUT = -5dBm, RLOAD = 100 diff. 2.0 0.6 10 CONDITIONS MIN 2.7 5.1 5.5 3.0 3.6 V V A 4.5 mA TYP MAX 5.5 7.4 UNITS V AC ELECTRICAL CHARACTERISTICS--MAX2470 (VCC = +3V, HI/LO = VCC, all outputs are differentially measured between OUT and OUT driving a 50 load through a 180 hybrid, TA = +25C, unless otherwise noted.) PARAMETER Input Frequency Range (Note 2) SYMBOL fIN HI/LO = VCC HI/LO = GND fIN = 10MHz HI/LO = VCC Gain (Note 3) IS21I2 HI/LO = GND fIN = 200MHz fIN = 500MHz, TA = TMIN to TMAX fIN = 10MHz fIN = 200MHz fIN = 200MHz, TA = TMIN to TMAX Voltage Gain (Note 4) AV fIN = 10MHz, HI/LO = GND fOUT = 500MHz, HI/LO = VCC fOUT = 200MHz, RHI/LO = GND 9.9 8.9 CONDITIONS MIN 10 10 14.9 14.9 13.3 13.8 14.1 13.4 16 10.2 dB 10.2 15.0 V/V 15.3 dB TYP MAX 500 200 UNITS MHz Noise Figure NF RSOURCE = 50 fOUT = 200MHz, RHI/LO = GND 2 _______________________________________________________________________________________ 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs AC ELECTRICAL CHARACTERISTICS--MAX2470 (continued) (VCC = +3V, HI/LO = VCC, all outputs are differentially measured between OUT and OUT driving a 50 load through a 180 hybrid, TA = +25C, unless otherwise noted.) PARAMETER Maximum Output VSWR (OUT, OUT) (Note 5) SYMBOL VSWROUT CONDITIONS 10MHz < fOUT < 500MHz, HI/LO = VCC 10MHz < fOUT < 200MHz, HI/LO = GND HI/LO = VCC IS12I2 HI/LO = GND Isolation OUT to OUT (Note 7) Harmonic Suppression fIN = 100MHz fIN = 500MHz fIN = 100MHz fIN = 200MHz MIN TYP 1.5:1 1.2:1 75 48 75 64 37 45 -26 -30 dB dBc dB MAX UNITS MAX2470/MAX2471 Reverse Isolation (Note 6) fIN = 500MHz, HI/LO = VCC fIN = 200MHz, HI/LO = GND fIN = 500MHz, POUT = -5dBm, HI/LO = VCC fIN = 200MHz, POUT = -5dBm, HI/LO = GND AC ELECTRICAL CHARACTERISTICS--MAX2471 (Typical values are measured at VCC = +3V, TA = +25C, unless otherwise noted.) (Note 8) PARAMETER Input Frequency Range (Note 2) Gain (Note 3) Voltage Gain (Note 4) Noise Figure Maximum Output VSWR (OUT, OUT) (Note 5) Reverse Isolation Isolation OUT to OUT (Note 7) Harmonic Suppression SYMBOL fIN fIN = 10MHz IS21I2 AV NF VSWROUT IS12I2 fIN = 200MHz fIN = 500MHz, TA = TMIN to TMAX fIN = 10MHz fOUT = 500MHz, RSOURCE = 50 10MHz < fOUT < 500MHz fIN = 100MHz fIN = 500MHz fIN = 500MHz fIN = 500MHz, POUT = -5dBm 11.3 CONDITIONS MIN 10 15.9 16.9 15.6 16 8.4 1.5:1 74 57 35 -29 dB dB dBc 17.8 V/V dB dB TYP MAX 500 UNITS MHz Note 1: Limits are 100% production tested at TA = +25C. Limits over the entire operating temperature range are guaranteed by design and characterization but are not production tested. Note 2: The part has been characterized over the specified frequency range. Operation outside of this range is possible but not guaranteed. Note 3: Gain specified for POUT = -5dBm. Note 4: Voltage gain measured with no input termination and no output load. Note 5: Output VSWR is a single-ended measurement for each OUT and OUT. Note 6: OUT to IN isolation with OUT terminated with 50. Note 7: Input terminated with 50. Note 8: Unless otherwise noted: all inputs are differentially measured between IN and IN driven by a 50 load through a 180 hybrid; all outputs are differentially measured between OUT and OUT driving a 50 load through a 180 hybrid. _______________________________________________________________________________________ 3 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs MAX2470/MAX2471 Typical Operating Characteristics (VCC = +3.0V, MAX2470 output and MAX2471 input and output measurements taken differentially, TA = +25C, unless otherwise noted.) MAX2470 SUPPLY CURRENT vs. SUPPLY VOLTAGE (HI/LO = GND) MAX2470/71-01 MAX2470 (HI/LO = VCC) AND MAX2471 SUPPLY CURRENT vs. SUPPLY VOLTAGE MAX2470/71-02 MAX2470 OUTPUT POWER vs. INPUT POWER 0 -1 -2 -3 -4 -5 -6 -7 -8 -9 -10 -11 -12 -13 -14 -15 -16 MAX2470/71-03 4.0 3.9 SUPPLY CURRENT (mA) 3.8 3.7 3.6 3.5 3.4 3.3 3.2 2.5 -5dBm OUTPUT POWER fIN = 200MHz HI/LO = GND 6.0 5.9 5.8 SUPPLY CURRENT (mA) 5.7 5.6 5.5 5.4 5.3 5.2 5.1 5.0 4.9 4.8 -5dBm OUTPUT POWER fIN = 500MHz HI/LO = GND (MAX2470) OUTPUT POWER (dBm) TA = +25C TA = +85C HI/LO = GND fIN = 200MHz HI/LO = VCC fIN = 500MHz TA = +85C TA = +25C TA = -40C TA = -40C 3.0 3.5 4.0 4.5 5.0 5.5 2.5 3.0 3.5 4.0 4.5 5.0 5.5 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 INPUT POWER (dBm) SUPPLY VOLTAGE (V) SUPPLY VOLTAGE (V) MAX2470 TRANSDUCER GAIN vs. FREQUENCY (HI/LO = GND) MAX2470/71-04 MAX2470 TRANSDUCER GAIN vs. FREQUENCY (HI/LO = VCC) TA = -40C 16.0 15.0 TA = +25C IS21I2 (dB) 14.0 13.0 12.0 11.0 TA = +85C NOISE FIGURE (dB) MAX2470/71-05 MAX2470 NOISE FIGURE vs. FREQUENCY (HI/LO = GND) HI/LO = GND 11.5 MAX2470/71-06 16.0 15.0 14.0 IS21I2 (dB) 13.0 TA = +85C 12.0 11.0 10.0 9.0 8.0 0 50 100 TA = +25C TA = -40C 17.0 12.0 11.0 10.5 10.0 HI/LO = VCC 9.5 0 100 200 300 400 500 0 50 100 FREQUENCY (MHz) 150 200 FREQUENCY (MHz) HI/LO = GND 150 200 10.0 9.0 FREQUENCY (MHz) MAX2470 NOISE FIGURE vs. FREQUENCY (HI/LO = VCC) MAX2470/71-07 MAX2470 REAL INPUT IMPEDANCE vs. FREQUENCY MAX2470/71-08 MAX2470 IMAGINARY INPUT IMPEDANCE vs. FREQUENCY HI/LO = VCC -500 -1000 -1500 -2000 MAX2470/71-09 12.0 HI/LO = VCC 11.5 NOISE FIGURE (dB) 10,000 HI/LO = VCC 0 1000 RE [ZIN] () IM [ZIN] () 0 50 100 150 200 250 300 350 400 450 500 FREQUENCY (MHz) 11.0 100 10.5 10 10.0 0 100 200 300 400 500 FREQUENCY (MHz) 1 -2500 -3000 0 100 200 300 400 500 FREQUENCY (MHz) 4 _______________________________________________________________________________________ 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs Typical Operating Characteristics (continued) (VCC = +3.0V, MAX2470 output and MAX2471 input and output measurements taken differentially, TA = +25C unless otherwise noted.) MAX2470 OUTPUT VSWR vs. FREQUENCY MAX2470/71-10 MAX2470/MAX2471 MAX2470 OUTPUT ISOLATION vs. FREQUENCY MAX2470/71-11 MAX2471 OUTPUT POWER vs. INPUT POWER 0 OUTPUT POWER (dBm) -2 -4 -6 -8 -10 -12 -14 500 -30 -28 -26 -24 -22 -20 -18 -16 -14 -12 -10 INPUT POWER (dBm) fIN = 200MHz fIN = 500MHz MAX2470/71-12 1.50 HI/LO = VCC INPUT TERMINATED IN 50 SINGLE-ENDED MEASUREMENT OUTPUT VSWR 90 80 OUTPUT ISOLATION (dB) 70 60 50 40 30 OUT TO OUT INPUT TERMINATED IN 50 OUT TO IN OUT TO IN HI/LO = VCC SINGLE-ENDED MEASUREMENT 2 OUT 1.25 OUT 1.00 0 100 200 300 400 500 FREQUENCY (MHz) 20 0 100 200 300 400 FREQUENCY (MHz) MAX2471 DIFFERENTIAL TRANSDUCER POWER GAIN vs. FREQUENCY MAX2470/71-13 MAX2471 NOISE FIGURE vs. FREQUENCY MAX2470/71-14 MAX2471 REAL INPUT IMPEDANCE vs. FREQUENCY MAX2470/71-15 17.5 TRANSDUCER POWER GAIN (dB) 17.0 16.5 16.0 15.5 15.0 14.5 14.0 0 TA = +85C TA = -40C TA = +25C 8.50 10,000 8.25 NOISE FIGURE (dB) 1000 8.00 RE [ZIN] () 100 7.75 7.50 10 7.25 50 100 150 200 250 300 350 400 450 500 FREQUENCY (MHz) 0 50 100 150 200 250 300 350 400 450 500 FREQUENCY (MHz) 1 0 50 100 150 200 250 300 350 400 450 500 FREQUENCY (MHz) MAX2471 IMAGINARY INPUT IMPEDANCE vs. FREQUENCY MAX2470/71-16 MAX2471 OUTPUT VSWR vs. FREQUENCY MAX2470/71-17 MAX2471 OUTPUT ISOLATION vs. FREQUENCY SINGLE-ENDED MEASUREMENT OUT TO IN MAX2470/71-18 500 1.50 INPUT TERMINATED SINGLE-ENDED MEASUREMENT VSWR OUT 1.25 90 80 OUTPUT ISOLATION (dB) 70 60 50 40 OUT TO OUT 30 INPUT TERMINATED IN 50 OUTPUT VSWR 0 IM [ZIN] () VSWR OUT -500 -1000 0 100 200 300 400 500 FREQUENCY (MHz) 1.00 0 100 200 300 400 500 FREQUENCY (MHz) 20 0 100 200 300 400 500 FREQUENCY (MHz) _______________________________________________________________________________________ 5 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs MAX2470/MAX2471 Pin Description PIN NAME MAX2470 1 2 3 MAX2471 1 2 3 OUT GND OUT Differential Noninverting Buffer Output. Broadband 50 output. AC coupling is required. Do not DC couple to this pin. RF Ground. Connect to the ground plane as close as possible to the IC to minimize ground path inductance. Differential Inverting Buffer Output. Broadband 50 output. AC coupling is required. Do not DC couple to this pin. Bias and Bandwidth Control Input. Connect to VCC to set internal bias for higher bandwidth operation (10MHz to 500MHz). Connect to GND to set internal bias for lower bandwidth operation (10MHz to 200MHz) and to reduce overall current consumption. Differential Inverting Buffer Input. High impedance input to buffer amplifier. See Setting The Input Impedance section. Differential Noninverting Buffer Input. High impedance to buffer amplifier. See Setting The Input Impedance section. Supply Voltage Input. +2.7V < VCC < +5.5V. FUNCTION 4 -- HI/LO -- 5 6 4 5 6 IN IN VCC _______________ Detailed Description Bandwidth Control Circuitry The MAX2470 features a logic-controlled bias circuit which optimizes the performance for input frequencies from 10MHz to 500MHz (HI/LO = VCC) and 10MHz to 200MHz (HI/LO = GND). Operating with HI/LO = GND significantly reduces power consumption. Output Considerations The MAX2470 and MAX2471 incorporate fully differential output stages capable of driving an AC-coupled 100 differential load or two AC-coupled 50 singleended loads. This is ideal for applications that require the oscillator to drive two application circuits (e.g. mixer and PLL) simultaneously. The high output-to-output isolation ensures minimal interaction between multiple load circuits. __________ Applications Information Input Considerations The MAX2470/MAX2471 offer high-impedance inputs, ideal for low-distortion buffering of a VCO. For applications with discrete transistor-based oscillator designs, simply AC-couple the oscillator directly to the inputs. The buffer's high input impedance results in minimal loading on the oscillator. For still higher real input impedance and reduced loading effects, match the inputs with a shunt-L matching circuit followed by a series blocking capacitor. For use with 50 VCO modules, terminate the buffer input(s) with a 50 shunt resistor followed by a series-blocking capacitor. This provides a very stable 50 termination and increases reverse isolation. For those applications needing both high gain and good input match, reactively match the buffer inputs to 50 with simple two-element matching circuits followed by a series blocking capacitor. 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. Bypass the power supply with decoupling capacitors as close to the VCC pins as possible. For long VCC lines (inductive), it may be necessary to add additional decoupling capacitors located further away from the device package. Proper grounding of GND is essential. If the PC board uses a topside RF ground, connect GND directly to it. For a board where the ground plane is not on the component side, the best technique is to connect GND to the board with a plated through-hole (via) to the ground plane close to the package. 6 _______________________________________________________________________________________ 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs Chip Information TRANSISTOR COUNT: 67 MAX2470/MAX2471 Package Information 6LSOT.EPS _______________________________________________________________________________________ 7 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs MAX2470/MAX2471 NOTES 8 _______________________________________________________________________________________ |
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