DEMO MANUAL DC1861A LTC5567 300MHz to 4GHz Active Downconverting Mixer with Wideband IF DESCRIPTION ABSOLUTE MAXIMUM RATINGS + Demonstration circuit 1861A is optimized for evaluation Supply Voltage (V , IF , IF ) ..................................4.0V CC of the LTC 5567 active downconverting mixer. Its RF Enable Input Voltage (EN) ................0.3V to V + 0.3V CC and LO input ports are internally matched to 50, from LO Input Power (350MHz to 4.5GHz) ................. +10dBm 1.4GHz to 3GHz, and from 1GHz to 4GHz, respectively. LO Input DC Voltage ............................................... 0.1V The IF output uses a bandpass network followed by an 8:1 RF Input Power (300MHz to 4GHz) .................... +15dBm transformer to provide a 50 match at 153MHz. The LO RF Input DC Voltage ............................................... 0.1V input is easily matched for higher or lower frequencies, as TEMP Monitor Input Current ..................................10mA low as 300MHz, with simple external matching. The low- Operating Temperature Range (T ) ........ 40C to 105C C capacitance differential IF output is usable up to 2.5GHz. Junction Temperature (T ) .................................... 150C J Storage Temperature Range .................. 65C to 150C Design files for this circuit board are available at DEMO MANUAL DC1861A NOTES ON TEST EQUIPMENT AND SETUP High performance signal generators with low harmonic Spectrum analyzers can produce significant internal outputs should be used for 2-tone measurements. Oth- distortion products if they are overdriven. Generally, erwise, lowpass filters at the signal generator outputs spectrum analyzers are designed to operate at their should be used to suppress harmonics. best with about 30dBm to 40dBm at their input. The spectrum analyzers input attenuation setting should 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 pro- spectrum analyzers input attenuation depending on vide good port-to-port isolation. Attenuator pads may the spectrum analyzer used. be used on the inputs to the combiner and the RF input port of the LTC5567 mixer shown in Figure1. Adding Before performing measurements on the DUT, the sys- attenuator pads further improves source isolation and tem performance should be evaluated to ensure that helps prevent the signal generators from producing a clean input signal is obtained and that the spectrum intermodulation products. analyzers internal distortion is minimized. QUICK START PROCEDURE 1. Connect all test equipment as shown in Figure 1. 5. Set the RF signal generators to provide one 1950MHz CW signal and one 1951MHz CW signal. The signals 2. Set the power supply output voltage to 3.3V, and set should be applied to the 2-way combiner. The output the current limit to 150mA. of the combiner should be applied to the demo boards 3. Connect the V pin to the 3.3V supply. Connect EN RF input port. The two tones should be set to about CC to the 3.3V supply. BE SURE TO CONNECT THE V 6dBm each at the mixers RF input port. CC PIN BEFORE THE EN PIN TO ENSURE THAT THE PART 6. Set the spectrum analyzers center frequency to 150MHz. DOES NOT GET DAMAGED. ALSO, REMOVE POWER FROM EN PIN BEFORE REMOVING POWER FROM 7. Perform various measurements (Conversion Gain, OIP3, THE V PIN. LO leakage, etc.) CC 4. Set the LO signal generator to provide a 1800MHz CW signal at about 0dBm to the demo boards LO port. PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 2 C1, C2 CAP, X7R, 0.01F, 25V, 10%, 0402 AVX, 04023C103KAT 2 1 C3 CAP, NPO, 2.7pF, 50V, 5%, 0402 AVX, 04025A2R7JAT 3 0 C4, C6 TBD, 0402 4 1 C5 CAP, NPO, 3.9pF, 50V, 5%, 0402 AVX, 04025A3R9JAT 5 2 C7, C8 CAP, NPO, 330pF, 16V, 5%, 0402 AVX, 0402YA331JAT 6 1 C9 CAP, X7R, 1F, 10V, 10%, 0603 AVX, 0603ZC105KAT 7 4 E1-E4 TESTPOINT, TURRET, 0.063 PBF MILL-MAX, 2308-2-00-80-00-00-07-0 8 4 J1-J4 CONN, SMA, 50 EDGE-LANCH E. F. JOHNSON, 142-0701-851(PBF) 9 2 L1, L2 INDUCTOR, WIREWOUND, 300nH, 5%, 0603 COILCRAFT, 0603HP-R30XJLW 10 2 R1, R2 RES, CHIP, 3.01k, 1/16W, 1% 0402 VISHAY, CRCW04023K01FKED 11 0 R3 TBD, 0402 12 1 R4 RES, CHIP, 0, 0603 NIC NRC060000TRF 13 1 T1 RF TRANSFORMER, TC8-1-10LN+ MINI-CIRCUITS, TC8-1-10LN+ 14 1 U1 LINEAR TECH. INC., LTC5567IUF I.C. LTC5567IUF, QFN 16 PIN, 4mm 4mm dc1861af 2