DEMO MANUAL DC1719A LTC5569 300MHz to 4GHz 3.3V DUAL ACTIVE DOWNCONVERTING MIXER Description aB solute Maxi Mu M r + Demonstration circuit DC1719A is optimized for evaluation Supply Voltage (V , V , IFA , IFA , CCA CCB + of the LTC 5569 dual active downconverting mixer. Its RF IFB , IFB ) ...................................................................4V and LO input ports are internally matched to 50 from Enable Input Voltage (ENA, ENB) ......0.3V to V + 0.3V CC 1.4GHz to 3.3GHz, and from 1GHz to 3.5GHz, respectively. Mixer Bias Voltage (BIASA, BIASB) ....0.3V to V + 0.3V CC The IF output uses a bandpass network followed by an LO Input Power (350MHz to 4.3GHz) ...................10dBm 8:1 transformer to provide a 50 match at 190MHz. The LO Input DC Voltage ............................................... 0.1V LTC5569 dual active mixer is optimized for diversity and for RF Input Power (300MHz to 4GHz) ......................15dBm MIMO receiver applications that require low power and small RF Input DC Voltage (RFA, RFB) ............................ 0.1V size. Each mixer includes an independent LO buffer amplifier, Operating Temperature Range (T ) ........ 40C to 105C C an active mixer core, and a bias circuit with an enable pin. Junction Temperature (T ) .................................... 150C J The symmetry of the IC assures that a phase and ampli- Storage Temperature Range .................. 65C to 150C tude coherent LO is applied to each mixer. Broadband integrated transformers on the RF and LO inputs provide CAUTION: This part is sensitive to electrostatic discharge single-ended 50 interfaces. The differential IF outputs (ESD). Observe proper ESD precautions when handling allow convenient interfacing to differential IF filters and the LTC5569. amplifiers. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Design files for this circuit board are available at DEMO MANUAL DC1719A n otes on t est e Ment an D s U s e h i g h p e r f o r m a n c e s i g n a l g e n e r a t o r s w i t h l o w Spectrum analyzers can produce significant internal harmonic outputs for 2-tone measurements to avoid distortion products if they are overdriven. Generally, distortion. Otherwise, lowpass filters at the signal gen- spectrum analyzers are designed to operate at their erator outputs 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 spectrum analyzers input attenuation depending on provide good port-to-port isolation. Attenuator pads the spectrum analyzer used. may be used on the inputs to the combiner and the RF input port of the LTC5569 mixer, as shown in Figure1. Before per forming measurements on the DUT, the Adding attenuator pads further improves source iso- system performance should be evaluated to ensure lation and helps prevent the signal generators from that a clean input signal is obtained and that the spec- producing intermodulation products. trum analyzers internal distortion is minimized. quick start proce D 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 250mA. of the combiner should be applied to the demo boards 3. Connect the V pin to the 3.3V supply. Connect ENA CC RFA port. The two tones should be set to about 6dBm to the 3.3V supply. each at the mixers RF input port. BE SURE TO CONNECT THE V PIN BEFORE THE CC 6. Set the spectrum analyzers center frequency to ENA PIN TO ENSURE THAT THE PART DOES NOT GET 190 MHz. DAMAGED. ALSO, REMOVE POWER FROM ENA PIN 7. Perform various measurements (conversion gain, BEFORE REMOVING POWER FROM THE V PIN. CC OIP3, LO leakage, etc.). 4. Set the LO signal generator to provide a 2140MHz 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 0402 2.7pF 0.25pF 50V NPO AVX, 04025A2R7CAT2A 2 1 C5 CAP, 0402 3.9pF 0.1pF 50V NPO AVX, 04025A3R9BAT 3 4 C7, C8, C9, C10 CAP, 0402 10nF 10% 25V X7R AVX, 04023C103KAT 4 1 C11 CAP, 0603 2.2F 10% 6.3V X5R AVX, 06036D225KAT 5 5 J1, J2, J3, J4, J5 CONN, BNC, SMA 50 EDGE-LANCH E. F. JOHNSON, 142-0701-851 6 4 L1, L2, L3, L4 0603 180nH 2% COILCRAFT, 0603HP-R18XGL 7 0 R1, R2, R3, R4 RES, 0402 OPTION OPTION 8 4 TP1, TP2, TP3, TP4 TURRET MILL-MAX, 2308-2-00-80-00-00-07-0 9 2 T1, T2 XFMR, WIDEBAND 2MHz TO 500MHz MINI-CIRCUITS, TC8-1+ 10 1 U1 IC, DUAL ACTIVE DOWNCONVERTING MIXER LINEAR TECHNOLOGY, LTC5569IUF dc1719af 2 ure etup quip