Linear Technology DC426B Operator's manual

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DC426B DEMO BOARD QUICK START GUIDE
Description:
The DC426B demo circuit board is intended to demonstrate the capabilities of the LT5511 high
signal level upconverting mixer IC for 1900MHz infrastructure applications.
The LT5511 mixer IC is designed to meet the high linearity requirements of cable TV
infrastructure downstream transmitters and wireless infrastructure transmit systems. The IC
includes a differential LO buffer amplifier driving a double-balanced mixer. The LO, RF and IF
ports can be easily matched to a broad range of frequencies for different applications. The high
performance capability of the LO buffer allows the use of a single-ended source, thus eliminating
the need for an LO balun.
The LT5511 mixer delivers +17dBm typical input 3rd order intercept at 950MHz, and +15.5dBm
IIP3 at 1900MHz, with IF input signal levels of –5dBm. The input 1dB compression point is
typically +6dBm.
The DC426B demo board is optimized to upconvert a 50MHz IF input to 1900MHz RF output
with the LO injected from the high-side at 1950MHz.
Figure 1. LT5511 IC Block Diagram
LO
BUFFER
LO- LO+
NC
IF-
IF+
GND
GND
VCCBIAS
BIAS
C
IR
CU
IT
S
1
2
3
4
5
6
7
8 9
10
11
12
13
14
15
16
17
RF-
RF+
NC
GND
GND
(BACKSIDE)
GND
GND
EN
VCCLO

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LT5511 Upconverting Mixer Single-Tone Measurements for 1900MHz 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. Set the dipswitch SW1 (Enable) to 1. Mixer is in ENABLE mode.
4. Set the Signal Generator #1 to provide a 1950MHz, -10dBm, CW signal to the demo board
LOin port.
5. Set the Signal Generator #2 to provide a 50MHz, -5dBm, CW signal to the demo board IFin
port.
6. Set the Spectrum Analyzer’s center frequency to 1900MHz. Perform mixer conversion gain,
and 1dB compression measurements.
7. Set the Spectrum Analyzer’s center frequency to 1950MHz. Perform mixer LO to RF
suppression measurement.
8. Set the Spectrum Analyzer’s center frequency to 1850MHz and 2050MHz. Perform input 2nd
order distortion measurement. (IIP2 = 2 * P1 – P2 – Gc, where P1 is the power level of the
desired output at 1900MHz, P2 is the largest 2nd order product at either 1850MHz or
2050MHz, and Gc is conversion gain. P1 and P2 are in units of dBm, and Gc is in dB.)
POWER SUPPLY
SPECTRUM
ANALYZER
SIGNAL
GENERATOR 2
SIGNAL
GENERATOR 1
Figure 2. Test Set-Up for Mixer Single-Tone Measurements

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LT5511 Upconverting Mixer Two-Tone Measurements for 1900MHz 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. Set the dipswitch SW1 (Enable) to 1. Mixer is in ENABLE mode.
4. Set the Signal Generator #1 to provide a 1950MHz, -10dBm, CW signal to the demo board
LOin port.
5. Set the Signal Generator #2 and #3 to provide two -5dBm CW signals to the demo board IFin
port—one at 50MHz, and the other at 51MHz.
6. Set the Spectrum Analyzer’s center frequency to 1899.5MHz. 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 1899MHz or 1900MHz, P3 is the largest 3rd order
product at either 1898MHz or 1901MHz, and Gc is conversion gain. P1 and P3 are in units
of dBm, and Gc is in dB.)
Figure 3. Test Set-Up for Mixer Two-Tone Measurements
POWER SUPPLY
SPECTRUM
ANALYZER
SIGNAL
GENERATOR 1
SIGNAL
GENERATOR 3
∑
SIGNAL
GENERATOR 2
3dB PAD 3dB PAD

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APPROVED VENDOR LIST
VENDOR PHONE NUMBER PART TYPE WEBSITE ADDRESS
AAC (was TAD) [phone] CHIP RESISTORS
AAC (was TAD) [phone]
AAVID [phone] HEAT SINKS
ALLEN BRADLEY [phone] CARBON RESISTORS
AMP [phone] PC MOUNT BNC
APEM [phone] SMD TOGGLE/PB SWITCH
API DELEVAN [phone] INDUCTORS
AVX [phone] CHIP CAPS
AVX [phone] CHIP RESISTORS
AVX [phone] TANTALUM CAPS
AVX [phone] HIGH VOLTAGE CAPS
BERG [phone] CONNECTORS
BH ELECTRONICS [phone] INDUCTORS
BI TECHNOLOGIES [phone] TRANSFORMERS
BI TECHNOLOGIES [phone] RES./RES. NETWORKS
BOURNS [phone] POTENTIOMETERS, SIPS
CADDOCK ELECTRONICS [phone] HIPO. RES., SIPS, DIPS
CENTRAL SEMI [phone] SMALL SIGNAL DISCRETES
CHICAGO MINIAT. LAMP [phone] LEDS
COILCRAFT [phone] INDUCTORS
COMM CON [phone] HEADERS, SHUNTS
CONNEX [phone] BNC CONNECTORS
COOPER ELECT. TECH. [phone] INDUCTORS
CORNELL DUBILIER [phone] CAPACITORS
CTS [phone] RESISTOR ARRAYS
CUI-STACK [phone] POWER CONNECTORS
DALE (see Vishay) [phone] INDUCTORS
DALE (see Vishay) [phone] SENSE RESISTORS
DATA DISPLAY PRODUCT [phone] LEDS
DIODES INC. [phone] DIODES
ELECTRONIC CONCEPTS [phone] 400V FILM CAPACITORS
EPSON [phone] CRYSTALS
FAIRCHILD [phone] LOGIC
FAIRCHILD [phone] MOSFETS
FAIRCHILD [phone] CRG (CUST. RESPONSE)
FCI [phone] HOT PLUG CONNECTORS
FUKUSHIMA [phone] MPC RESISTORS
FUJI [phone] SCHOTTKY DIODES
GENERAL
SEMICONDUCTOR [phone] DIODES
GOWANDA [phone] INDUCTORS
GRAYHILL [phone] DIP SWITCHES
HARRIS [phone] LOGIC
HEWLETT PACKARD [phone] IR LED

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HITACHI [phone] RF POWER AMPS
IDT [phone] LOGIC IC
IR [phone] MOSFETS
IRC [phone] SENSE RESISTORS
ITW PAKTRON [phone] CAPACITORS
JOHNSON COMPONENTS [phone] RF CONNECTORS
JOHNSON COMPONENTS [phone] RF CONNECTORS
KEMET [phone] TANTALUM CAPS
KEMET [phone] CRG (CUST. RESPONSE)
KETEMA [phone] SURGE SUPPRESSORS
KEYSTONE [phone] JACKS, TURRETS
LITEON [phone] LEDS, DIODES
LTC [phone] HIGH PERF. I.C.S
MAGNETICS [phone] TOROID CORES ETC.
MARCON [phone] HIGH C/V CAPACITORS
METHODE [phone] ZIF SOCKETS
MF ELECTRONICS [phone] CRYSTAL OSCILLATORS
MICROCHIP [phone] MICROCONTROLLER IC
MICRO PLASTICS [phone] NYLON STANDOFFS
MICRO-SEMI [phone] DIODES
MIDCOM [phone] INDUCTORS
MIDCOM [phone] INDUCTORS
MILL-MAX [phone] TURRETS
MINICIRCUITS [phone] RF TRANSFORMERS
MOTOROLA [phone] LOGIC, REGS
MURATA ELECTRONICS [phone] CAPS., INDUCTORS,
MURATA ELECTRONICS [phone] CRG (CUST. RESPONSE)
MURATA ELECTRONICS [phone] RF DEVICES
NEC/TOKIN [phone] INDUCTORS/HI C/V CAPS
NICHIA [phone] WHITE LEDS
NICHICON [phone]
ELECTROLYTIC
CAPACITOR
ON SEMICONDUCTOR [phone] DISCRETE DIODES ETC.
ON SHORE [phone] TERMINATORS
PANASONIC [phone] INDUCTORS, POLY CAPS
PANASONIC [phone] LEDS
PANASONIC [phone] SWITCHES
PERICOM [phone] LOGIC IC
PHILIPS [phone] INDUCTORS
PHILIPS [phone] PLANAR INDUCTORS
PHILIPS [phone] DISCRETES, I.C.s
PULSE [phone] INDUCTORS
QT OPTOELECTRONICS [phone] RF SWITCH
RAYCHEM [phone] FUSES
RG ALLEN [phone] METAL OXIDE RESISTORS
RF MICRO DEVICES [phone] RF2138 / RF2140
SAMTEC [phone] WIRE JUMPERS
SANYO [phone] OSCON CAPS

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SCHOTT [phone] INDUCTORS, XFORMERS
SCHURTER [phone] FUSES AND HOLDERS
SIGNATRON [phone] DB9 CONNECTORS
SIEMENS [phone] OPTO
SILICONIX [phone] MOSFETS
SILICONIX [phone] MOSFETS
SPRAGUE [phone] CAPACITORS
SULLINS [phone] HEADERS, SHUNTS
SUMIDA [phone] INDUCTORS
SUMIDA [phone] INDUCTORS
TAIYO YUDEN [phone] CHIP CAPS / RES.
TAIYO YUDEN [phone] CRG (CUST. RESPONSE)
TEKTRONIX [phone] SCOPE PROBE SOCKETS
TEMIC [phone] IR PHOTO DIODE
THERMALLOY [phone] HEAT SINKS
THIN FILM TECHNOLOGY [phone]
THIN FILM CHIP
RESISTORS
TOCOS [phone] SMD POTENTIOMETERS
TOKIN (NEC) [phone] CAPS., INDUCTORS,
TOKO [phone] RF PRODUCTS
TOSHIBA [phone] SINGLE GATE LOGIC
TOSHIBA [phone] LOGIC
UNITED CHEMICON [phone]
ELECTROLYTIC
CAPACITOR
VISHAY [phone]
ZENER/SM. SIGNAL
DIODES
VISHAY [phone] INDUCTORS, SENSE Rs
VITRAMON [phone]
CERAMIC CHIP
CAPACITOR
WIMA [phone] PAPER/FILM CAPACITORS
ZETEX [phone] SMALL SIGNAL DISCRETES
ZIERICK [phone] STAKED PINS

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Mouser Electronics
Authorized Distributor
Click to View Pricing, Inventory, Delivery & Lifecycle Information:
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DC426B