Linear Technology DC503A User manual

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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 LT5512 (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 LO-

RF 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

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LT5512 Downconverting Mixer Single-Tone Measurements for 1230 MHz CATV Band.

1. Connect all test equipment as shown in Figure 2.

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 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.

SPECTRUM

ANALYZER

SIGNAL

GENERATOR 1

SIGNAL

GENERATOR 2

POWER SUPPLY

Figure 2. Test Set-Up for Mixer Single-Tone Measurements.

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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.)

SPECTRUM

ANALYZER

SIGNAL

GENERATOR 1

SIGNAL

GENERATOR 2

POWER SUPPLY

Figure 3. Test Set-Up for Mixer Two-Tone Measurements.

SIGNAL

GENERATOR 3

∑

3dB PAD

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APPROVED VENDOR LIST

VENDOR PHONE NUMBER PART TYPE WEBSITE ADDRESS

AAC (was TAD) (800) 508-1521 CHIP RESISTORS

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. (561) 752-5000 INDUCTORS

CORNELL DUBILIER (508) 996-8561 CAPACITORS

CTS (219) 293-7511 RESISTOR ARRAYS

CUI-STACK (503) 643-4899 POWER CONNECTORS

DALE (see Vishay) (605) 665-1627 INDUCTORS

DALE (see Vishay) (605) 665-9301 SENSE RESISTORS

DATA DISPLAY PRODUCT (800) 421-6815 LEDS

DIODES INC. (805) 446-4800 DIODES

ELECTRONIC CONCEPTS (908) 542-7880 400V FILM CAPACITORS

EPSON (310) 787-6300 CRYSTALS

FAIRCHILD (207) 775-4502 LOGIC

FAIRCHILD (408) 822-2126 MOSFETS

FAIRCHILD (888) 522-5372 CRG (CUST. RESPONSE)

FCI (717) 767-8005 HOT PLUG CONNECTORS

FUKUSHIMA (818) 765-8300 MPC RESISTORS

FUJI (201) 712-0555 SCHOTTKY DIODES

GENERAL

SEMICONDUCTOR (516) 847-3000 DIODES

GOWANDA (716) 532-2234 INDUCTORS

GRAYHILL (708) 354-1040 DIP SWITCHES

HARRIS (800) 442-7747 LOGIC

HEWLETT PACKARD (800) 235-0312 IR LED

HITACHI (408) 433-1990 RF POWER AMPS

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IDT (408) 727-6116 LOGIC IC

IR (310) 322-3331 MOSFETS

IRC (361) 992-7900 SENSE RESISTORS

ITW PAKTRON (708) 667-3444 CAPACITORS

JOHNSON COMPONENTS (650) 948-6533 RF CONNECTORS

JOHNSON COMPONENTS (760) 434-5961 RF CONNECTORS

KEMET (408) 986-0424 TANTALUM CAPS

KEMET (864) 963-6300 CRG (CUST. RESPONSE)

KETEMA (714) 630-0081 SURGE SUPPRESSORS

KEYSTONE (718) 956-8900 JACKS, TURRETS

LITEON (408) 241-4588 LEDS, DIODES

LTC (408) 432-1900 HIGH PERF. I.C.S

MAGNETICS (800) 245-3984 TOROID CORES ETC.

MARCON (847) 696-2000 HIGH C/V CAPACITORS

METHODE (800) 323-6864 ZIF SOCKETS

MF ELECTRONICS (914) 576-6570 CRYSTAL OSCILLATORS

MICROCHIP (602) 786-7200 MICROCONTROLLER IC

MICRO PLASTICS (870) 453-8861 NYLON STANDOFFS

MICRO-SEMI (617) 926-0404 DIODES

MIDCOM (605) 886-4385 INDUCTORS

MIDCOM (800) 643-2661 INDUCTORS

MILL-MAX (516) 922-6000 TURRETS

MINICIRCUITS (718) 934-4500 RF TRANSFORMERS

MOTOROLA (800) 441-2447 LOGIC, REGS

MURATA ELECTRONICS (770) 436-1300 CAPS., INDUCTORS,

MURATA ELECTRONICS (800) 831-9172 CRG (CUST. RESPONSE)

MURATA ELECTRONICS (770) 433-5789 RF DEVICES

NEC/TOKIN (510) 324-4110 INDUCTORS/HI C/V CAPS

NICHIA (408) 573-0933 WHITE LEDS

NICHICON (847) 843-7500 ELECTROLYTIC CAPACITOR

ON SEMICONDUCTOR (602) 244-6600 DISCRETE DIODES ETC.

ON SHORE (602) 921-3000 TERMINATORS

PANASONIC (714) 373-7334 INDUCTORS, POLY CAPS

PANASONIC (201) 348-5217 LEDS

PANASONIC (201) 373-7334 SWITCHES

PERICOM (408) 435-0800 LOGIC IC

PHILIPS (914) 246-2811 INDUCTORS

PHILIPS (914) 247-2036 PLANAR INDUCTORS

PHILIPS (508) 851-2200 DISCRETES, I.C.s

PULSE (619) 674-8100 INDUCTORS

QT OPTOELECTRONICS (408) 720-1440 RF SWITCH

RAYCHEM (800) 227-4856 FUSES

RG ALLEN (818) 765-8300 METAL OXIDE RESISTORS

RF MICRO DEVICES (336) 664-1233 RF2138 / RF2140

SAMTEC (800) 726-8329 WIRE JUMPERS

SANYO (619) 661-6835 OSCON CAPS

SCHOTT (507) 532-3201 INDUCTORS, XFORMERS

SCHURTER (707) 778-6311 FUSES AND HOLDERS

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SIGNATRON (909) 464-1883 DB9 CONNECTORS

SIEMENS (108) 257-7910 OPTO

SILICONIX (800) 554-5565 MOSFETS

SILICONIX (408) 988-8000 MOSFETS

SPRAGUE (207) 324-4140 CAPACITORS

SULLINS (760) 744-0125 HEADERS, SHUNTS

SUMIDA (847) 956-0667 INDUCTORS

SUMIDA (408) 982-9660 INDUCTORS

TAIYO YUDEN (408) 573-4150 CHIP CAPS / RES.

TAIYO YUDEN (800) 348-2496 CRG (CUST. RESPONSE)

TEKTRONIX (800) 835-9433 SCOPE PROBE SOCKETS

TEMIC (408) 970-5700 IR PHOTO DIODE

THERMALLOY (972) 243-4321 HEAT SINKS

THIN FILM TECHNOLOGY (507) 625-8445 THIN FILM CHIP RESISTORS

TOCOS (847) 884-6664 SMD POTENTIOMETERS

TOKIN (NEC) (510) 324-4110 CAPS., INDUCTORS,

TOKO (847) 699-3430 RF PRODUCTS

TOSHIBA (714) 455-2000 SINGLE GATE LOGIC

TOSHIBA (949) 455-2000 LOGIC

UNITED CHEMICON (847) 696-2000 ELECTROLYTIC CAPACITOR

VISHAY (605) 665-9301 ZENER/SM. SIGNAL DIODES

VISHAY (605) 665-9301 INDUCTORS, SENSE Rs

VITRAMON (203) 268-6261 CERAMIC CHIP CAPACITOR

WIMA (914) 347-2474 PAPER/FILM CAPACITORS

ZETEX (631) 366-5068 SMALL SIGNAL DISCRETES

ZIERICK (800) 882-8020 STAKED PINS

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