DC503A - Demo Manual

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 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
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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.
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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.)
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.
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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.
(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)
WEBSITE ADDRESS
CHIP RESISTORS
FCI
(717) 767-8005
HOT PLUG CONNECTORS
FUKUSHIMA
(818) 765-8300
MPC RESISTORS
FUJI
GENERAL
SEMICONDUCTOR
(201) 712-0555
SCHOTTKY DIODES
(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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