DEMO MANUAL DC2070A LTC5577 300MHz to 6GHz High Signal Level Active Downconverting Mixer DESCRIPTION ABSOLUTE MAXIMUM INPUT RATINGS Demonstration circuit DC2070A is optimized for evaluation + of the LTC 5577 high signal level active downconverting Supply Voltage (V , IF , IF ) .....................................4V CC mixer. Its RF input port is matched to 50 from 1.3GHz to Enable Input Voltage (EN) ................0.3V to V + 0.3V CC 4.3GHz with 12dB return loss, and the LO port is matched LO Input Power (300MHz to 6GHz) ......................10dBm to 50 from 930MHz to 4.1GHz with 10dB return loss. LO Input DC Voltage ............................................... 0.1V The RF and LO inputs are easily matched for higher or RF Input Power (300MHz to 6GHz) ......................18dBm lower frequencies with simple external matching, as low RF Input DC Voltage ............................................... 0.1V as 350MHz and 300MHz, respectively. The low capacitance TEMP Monitor Input Current ..................................10mA differential IF output is usable up to 1.5GHz. The LTC5577 Operating Temperature Range (T ) ........ 40C to 105C C active mixer is optimized for RF downconverting applica- Junction Temperature (T ) .................................... 150C J tions that require high input signal handling capability and Storage Temperature Range .................. 65C to 150C wide bandwidth. CAUTION: THIS PART IS SENSITIVE TO ELECTRO- Design files for this circuit board are available at STATIC DISCHARGE (ESD). OBSERVE PROPER ESD DEMO MANUAL DC2070A NOTES ON TEST EQUIPMENT AND SETUP n n High performance signal generators with low harmonic Spectrum analyzers can produce significant internal outputs should be used for 2-tone measurements. distortion products if they are overdriven. Generally, Otherwise, low pass filters at the signal generator out- spectrum analyzers are designed to operate at their puts should be used to suppress harmonics. best with about 30dBm to 40dBm at their input. The spectrum analyzers input attenuation setting should n High quality combiners should be used to present a be used to avoid saturating the instrument. Set the broadband 50 termination on all ports as well as spectrum analyzers input attenuation depending on provide good port-to-port isolation. Attenuator pads the spectrum analyzer used. should be used on the inputs to the combiner and the RF n input port of the LTC5577 mixer, as shown in Figure 1. Before performing measurements on the DUT, the Adding attenuator pads further improves source iso- system performance should be evaluated to ensure that lation and helps prevent the signal generators from a clean input signal is obtained and that the spectrum producing intermodulation products. analyzers internal distortion is minimized PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 4 C1, C2, C7, C8 CAP, 1nF, 10%, 16V, X7R, 0402 MURATA, GRM155R71C102KA01D 2 1 C3 CAP, 8.2pF, 0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H8R2CA01D 3 1 C4 CAP, 0.7pF, 0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1HR70BB01D 4 1 C5 CAP, 3.9pF, 0.1pF, 50V, NPO, 0402 MURATA, GJM1555C1H3R9BB01D 5 0 R3, L4, L5, L6, C6, C10, C11, COMP, 0402, OPT 0402 C12, C13 6 1 C9 CAP, 1F, 10%, 10V, X7R, 0603 MURATA, GRM188R61A105KA61D 7 3 E1, E3, E4 TURRET, PAD, 0.094 MILL-MAX, 2501-2-00-80-00-00-07-0 8 1 E2 TURRET, PAD, 0.061 MILL-MAX, 2308-2-00-80-00-00-07-0 9 4 J1-J4 CONN, SMA, 50, EDGE-LAUNCH E.F. JOHNSON, 142-0701-851 10 2 L1, L2 IND, 560nH, 2%, 0603 COILCRAFT, 0603LS-561XGL 11 2 R1, R2 RES, CHIP, 115, 1%, 0402 VISHAY, CRCW0402115RFKED 12 1 U1 IC, LINEAR TECHNOLOGY, LTC5577IUF, LINEAR TECHNOLOGY, LTC5577IUF QFN16, 44 QUICK START PROCEDURE 1. Set the power supply output voltage to 3.3V and the 3. Ramp on the power supply with a minimum ramp time current limit to 250mA. Turn off the power supply of 1ms. output. 4. Set the LO signal generator to provide an 1800MHz 2. Connect all test equipment and the power supply as CW signal at about 0dBm at the DC2070As LO port. shown in Figure 1. dc2070afa 2