MAX2470/MAX2471 19-4797 Rev 0 2/99 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs General Description Features The MAX2470/MAX2471 are flexible, low-cost, high- +2.7V to +5.5V Supply Range reverse-isolation buffer amplifiers for applications with Input Frequency Range discrete and module-based VCO designs. Both feature High: 10MHz to 500MHz (MAX2470/2471) differential 50 outputs for driving a single differential (balanced) load or two separate single-ended (unbal- Low: 10MHz to 200MHz (MAX2470) anced) 50 loads. The MAX2470 offers a single-ended >14dB Power Gain at 200MHz input and has two selectable frequency ranges of oper- ation: 10MHz to 500MHz and 10MHz to 200MHz. The 64dB Typical Reverse Isolation at 200MHz MAX2471 offers a differential input and operates from Low-Distortion Output Drive 10MHz to 500MHz. The MAX2470/MAX2471 also feature high input impedance for maximum flexibility, enabling Ultra-Small SOT23-6 Package them to be used with a variety of oscillator topologies. High Input Impedance High reverse isolation combined with low supply current make them ideal for applications requiring high perfor- Single-Ended (MAX2470) or Differential mance with low power. (MAX2471) Inputs These devices are also ideal for use as active baluns. The MAX2470 converts a single-ended input to a differ- ential output. The MAX2471 is useful as a differential Ordering Information buffer stage or to convert from a differential input to two single-ended outputs. PIN- SOT TOP PART TEMP. RANGE PACKAGE MARK The MAX2470 operates from a single +2.7V to +5.5V supply. At -5dBm output power, it consumes 5.5mA in MAX2470EUT-T -40C to +85C 6 SOT23-6 AAAX the high-frequency range and only 3.6mA in the MAX2471EUT-T -40C to +85C 6 SOT23-6 AAAY 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 plas- Typical Operating Circuits tic packages, requiring minimal board space. V CC Applications HI/LO Cellular and PCS Mobile Phones MAX2470 ISM-Band Applications BIAS Active Baluns OUT General-Purpose Buffers/Amplifiers IN 50 OUT Pin Configuration 50 GND V CC TOP VIEW OUT16 V CC MAX2471 BIAS MAX2470 OUT GND 2 5 IN IN MAX2471 50 IN OUT OUT34 HI/LO (IN) 50 SOT23-6 GND ( ) ARE FOR MAX2471 Maxim Integrated Products 1 For free samples & the latest literature: 10MHz to 500MHz VCO Buffer Amplifiers with Differential Outputs ABSOLUTE MAXIMUM RATINGS V to GND..............................................................-0.3V to +7V Operating Temperature Range ...........................-40C to +85C CC IN to GND......-0.3V to (V + 0.3V) or 3.7V (whichever is lower) Junction Temperature......................................................+150C CC IN to IN ..................................................................-2.2V to +2.2V Storage Temperature Range .............................-65C to +150C HI/LO to GND .............................................-0.3V to (V + 0.3V) Lead Temperature (soldering, 10sec ) ............................+300C CC Continuous Power Dissipation SOT23-6 (derate 8.7mW/C above +70C)...................696mW 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, V = +2.7V to +5.5V, T = T to T , unless otherwise noted. Typical values are at V = +3V, CC A MIN MAX CC T = +25C.) (Note 1) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS Supply Voltage Range V 2.7 5.5 V CC No signal 5.1 7.4 HI/LO = V CC P = -5dBm, OUT 5.5 R = 100 diff. LOAD Supply Current I mA CC No signal No signal 3.0 4.5 HI/LO = GND P = -5dBm, OUT 3.6 R = 100 diff. LOAD V 2.0 V HI/LO Input Level High IH HI/LO Input Level Low V 0.6 V IL HI/LO Input Bias Current I VHI/LO = GND or V -10 10 A IN CC AC ELECTRICAL CHARACTERISTICSMAX2470 (V = +3V, HI/LO = V , all outputs are differentially measured between OUT and OUT driving a 50 load through a 180 hybrid, CC CC T = +25C, unless otherwise noted.) A PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS HI/LO = V 10 500 Input Frequency Range CC f MHz IN (Note 2) HI/LO = GND 10 200 f = 10MHz 14.9 IN f = 200MHz 14.9 IN HI/LO = V CC f = 500MHz, IN 8.9 13.3 15.3 T = T to T A MIN MAX 2 Gain (Note 3) IS I dB 21 f = 10MHz 13.8 IN f = 200MHz 14.1 IN HI/LO = GND f = 200MHz, IN 9.9 13.4 15.0 T = T to T A MIN MAX Voltage Gain (Note 4) A 16 V/V V f = 10MHz, HI/LO = GND IN f = 500MHz, OUT 10.2 HI/LO = V CC Noise Figure NF R = 50 dB SOURCE f = 200MHz, f = 200MHz, OUT OUT 10.2 RHI/LO = GND RHI/LO = GND 2 MAX2470/MAX2471