DC503A DEMO BOARD QUICK START GUIDE Description: The DC503A demo circuit board is intended to demonstrate the capabilities of the LT5512 downconverting mixer IC for cable infrastructure applications. The LT5512 (Figure 1) is a broadband high signal level mixer IC optimized for high linearity downconverter applications including cable and wireless infrastructure. The IC includes a differential LO buffer driving a double-balanced mixer. An integrated RF amplifier improves LORF isolation and eliminates the need for precision external bias resistors. The LT5512 is a high-linearity alternative to passive diode mixers. Unlike passive mixers, which have conversion loss and require high LO drive level, the LT5512 delivers conversion gain and requires significantly lower LO drive levels. The DC503A demo board downconverts 1230MHz RF input to 270-870MHz IF output. The LO is injected from the high-side between 1500MHz and 2100MHz. Figure 1. LT5512 IC Block Diagram 1 of 11 LT5512 Downconverting Mixer Single-Tone Measurements for 1230 MHz CATV Band. 1. 2. 3. 4. Connect all test equipment as shown in Figure 2. Set the Power Supply output voltage to 5V, and set the current limit to 100mA. Connect TP1 (EN) to the 5V power supply. Mixer is in ENABLE mode. Set the Signal Generator #1 to provide an 1800MHz, -10dBm, CW signal to the demo board LOin port. 5. Set the Signal Generator #2 to provide a 1230MHz, -10dBm, CW signal to the demo board RFin port. 6. Set the Spectrum Analyzer’s center frequency to 570MHz. Perform mixer conversion gain, and 1dB compression measurements. 7. Set the Spectrum Analyzer’s center frequency to 1800MHz. Perform mixer LO to IF leakage measurement. SIGNAL GENERATOR 1 SIGNAL GENERATOR 2 SPECTRUM ANALYZER POWER SUPPLY Figure 2. Test Set-Up for Mixer Single-Tone Measurements. 2 of 11 LT5512 Downconverting Mixer Two-Tone Measurements for 1230MHz CATV Band. 1. Connect all test equipment as shown in Figure 3. Note: 1). A high quality combiner that provides 50-ohm termination on all ports and has good port-to-port isolation should be used. 2). The two 3dB attenuators on the inputs of the combiner are used to further improve source isolation. 2. Set the Power Supply output voltage to 5V, and set the current limit to 100mA. 3. Connect TP1 (EN) to the 5V power supply. Mixer is in ENABLE mode. 4. Set the Signal Generator #1 to provide a 1800MHz, -10dBm, CW signal to the demo board LOin port. 5. Set the Signal Generator #2 and #3 to provide two -10dBm CW signals to the demo board RFin port—one at 1229.9MHz, and the other at 1230.1MHz. 6. Set the Spectrum Analyzer’s center frequency to 570MHz. Perform input 3rd order distortion measurement. (IIP3 = P1 + (P1 – P3) / 2 – Gc, where P1 is the lowest power level of the two desired output tones at either 569.9MHz or 570.1MHz, P3 is the largest 3rd order product at either 569.7MHz or 570.3MHz, and Gc is conversion gain. P1 and P3 are in units of dBm, and Gc is in dB.) SIGNAL GENERATOR 1 SIGNAL GENERATOR 2 3dB PAD SPECTRUM ANALYZER ∑ 3dB PAD SIGNAL GENERATOR 3 POWER SUPPLY Figure 3. Test Set-Up for Mixer Two-Tone Measurements. 3 of 11 4 of 11 5 of 11 APPROVED VENDOR LIST VENDOR PHONE NUMBER PART TYPE AAC (was TAD) (800) 508-1521 AAC (was TAD) (714) 255-9186 AAVID (714) 556-2665 HEAT SINKS ALLEN BRADLEY (800) 592-4888 CARBON RESISTORS AMP (717) 564-0100 PC MOUNT BNC APEM (718) 246-1007 SMD TOGGLE/PB SWITCH API DELEVAN (716) 652-3600 INDUCTORS AVX (843) 946-0362 CHIP CAPS AVX (843) 946-0524 CHIP RESISTORS AVX (207) 282-5111 TANTALUM CAPS AVX (843) 946-0323 HIGH VOLTAGE CAPS BERG (800) 237-2374 CONNECTORS BH ELECTRONICS (952) 894-9590 INDUCTORS BI TECHNOLOGIES (714) 447-2656 TRANSFORMERS BI TECHNOLOGIES (714) 447-2345 RES./RES. NETWORKS BOURNS (801) 750-7253 POTENTIOMETERS, SIPS CADDOCK ELECTRONICS (541) 496-0700 HIPO. RES., SIPS, DIPS CENTRAL SEMI (631) 435-1110 SMALL SIGNAL DISCRETES CHICAGO MINIAT. LAMP (201) 489-8989 LEDS COILCRAFT (847) 639-6400 INDUCTORS COMM CON (626) 301-4200 HEADERS, SHUNTS CONNEX (805) 378-6464 BNC CONNECTORS COOPER ELECT. TECH. 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