DC420A - Demo Manual

October 15, 2002
DC420A-B DEMO BOARD QUICK START GUIDE
DESCRIPTION
The DC420A-B contains the LTC4401-1 RF power controller chip and can be used to
test the RF detector and controller characteristics. The LTC4400-1 is a power controller
for slow turn-on RF power amplifiers. This demo board has been designed to
demonstrate the power control capability of the LTC4401-1 at input frequencies and
powers ranges between 800MHz to 2700 MHz and –28 to +18 dBm, correspondingly.
OPEN-LOOP TEST PROCEDURES
Refer to Figure 1 for test set-up. This set-up operates the device as an RF comparator.
Connect 3.6V to the VBATT pin and connect the ground wire to GND on the DC420A-B
board. Connect an RF signal generator to the RF SMA connector. Set the desired
frequency and amplitude. Note: It is common practice to include a 3dB pad to minimize
reflections back into the signal Generator. The RF signal generator must be off during the
autozero mode. Connect 0V to the RAMP pin and connect the ground wire to GND.
Connect an oscilloscope probe to VPC and connect the ground clip to GND.
After power up, apply a single step pulse to SHDNB equal to the VBATT voltage. When
this pulse is low, the part is in shutdown mode. The RF input signal must be off, and the
RAMP voltage must be at 0V.
When the SHDNB pulse switches high, the part is in autozero mode for 10us then goes
into enable mode. The VPC voltage will step up to the start voltage after autozero is
completed. The output should look noisy since the LTC4400-1 is operating open-loop as
a comparator and the autozero has perfectly balanced the amplifier. It will typically swing
between 1 to 3V in an erratic fashion. If this does not occur, the part should be recycled
through shutdown to make sure that the autozero correctly cancels the amplifier offsets.
The autozero cancellation voltage will droop over time. Therefore, it is important to
complete the measurement within 10 seconds.
The SHDNB pulse must remain high during the RAMP switch point measurement. To
perform a measurement, set the RF signal generator to any frequency from 800MHz to
2700 MHz and RF output at –28 to +18 dBm. VPC will then switch low.
Increase the RAMP voltage until VPC switches to a mid-point. This switch point voltage
is the RF detected voltage referenced to RAMP. Increasing the RAMP voltage more will
force VPC output going to upper rail, about 2.7 v.
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MODE SHDNB OPERATION
Shutdown
Low
Disabled
Enable
High
Power Control
Power Supply # 1
C.W Signal Generator
Digital Volt Meter
Oscilloscope
Power Supply # 2
Figure 1. Test and measurement Set up diagram for DC420A-B
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APPROVED VENDOR LIST
VENDOR
AAC (was TAD)
AAC (was TAD)
AAVID
ALLEN BRADLEY
AMP
APEM
API DELEVAN
AVX
AVX
AVX
AVX
BERG
BH ELECTRONICS
BI TECHNOLOGIES
BI TECHNOLOGIES
BOURNS
CADDOCK ELECTRONICS
CENTRAL SEMI
CHICAGO MINIAT. LAMP
COILCRAFT
COMM CON
CONNEX
COOPER ELECT. TECH.
CORNELL DUBILIER
CTS
CUI-STACK
DALE (see Vishay)
DALE (see Vishay)
DATA DISPLAY PRODUCT
DIODES INC.
ELECTRONIC CONCEPTS
EPSON
FAIRCHILD
FAIRCHILD
FAIRCHILD
FCI
FUKUSHIMA
FUJI
GENERAL SEMICONDUCTOR
GOWANDA
GRAYHILL
HARRIS
HEWLETT PACKARD
HITACHI
IDT
PHONE NUMBER
(800) 508-1521
(714) 255-9186
(714) 556-2665
(800) 592-4888
(717) 564-0100
(718) 246-1007
(716) 652-3600
(843) 946-0362
(843) 946-0524
(207) 282-5111
(843) 946-0323
(800) 237-2374
(952) 894-9590
(714) 447-2656
(714) 447-2345
(801) 750-7253
(541) 496-0700
(631) 435-1110
(201) 489-8989
(847) 639-6400
(626) 301-4200
(805) 378-6464
(561) 752-5000
(508) 996-8561
(219) 293-7511
(503) 643-4899
(605) 665-1627
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(516) 847-3000
(716) 532-2234
(708) 354-1040
(800) 442-7747
(800) 235-0312
(408) 433-1990
(408) 727-6116
PART TYPE
WEBSITE ADDRESS
CHIP RESISTORS
HEAT SINKS
CARBON RESISTORS
PC MOUNT BNC
SMD TOGGLE/PB SWITCH
INDUCTORS
CHIP CAPS
CHIP RESISTORS
TANTALUM CAPS
HIGH VOLTAGE CAPS
CONNECTORS
INDUCTORS
TRANSFORMERS
RES./RES. NETWORKS
POTENTIOMETERS, SIPS
HIPO. RES., SIPS, DIPS
SMALL SIGNAL DISCRETES
LEDS
INDUCTORS
HEADERS, SHUNTS
BNC CONNECTORS
INDUCTORS
CAPACITORS
RESISTOR ARRAYS
POWER CONNECTORS
INDUCTORS
SENSE RESISTORS
LEDS
DIODES
400V FILM CAPACITORS
CRYSTALS
LOGIC
MOSFETS
CRG (CUST. RESPONSE)
HOT PLUG CONNECTORS
MPC RESISTORS
SCHOTTKY DIODES
DIODES
INDUCTORS
DIP SWITCHES
LOGIC
IR LED
RF POWER AMPS
LOGIC IC
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IR
IRC
ITW PAKTRON
JOHNSON COMPONENTS
JOHNSON COMPONENTS
KEMET
KEMET
KETEMA
KEYSTONE
LITEON
LTC
MAGNETICS
MARCON
METHODE
MF ELECTRONICS
MICROCHIP
MICRO PLASTICS
MICRO-SEMI
MIDCOM
MIDCOM
MILL-MAX
MINICIRCUITS
MOTOROLA
MURATA ELECTRONICS
MURATA ELECTRONICS
MURATA ELECTRONICS
NEC/TOKIN
NICHIA
NICHICON
ON SEMICONDUCTOR
ON SHORE
PANASONIC
PANASONIC
PANASONIC
PERICOM
PHILIPS
PHILIPS
PHILIPS
PULSE
QT OPTOELECTRONICS
RAYCHEM
RG ALLEN
RF MICRO DEVICES
SAMTEC
SANYO
SCHOTT
SCHURTER
SIGNATRON
(310) 322-3331
(361) 992-7900
(708) 667-3444
(650) 948-6533
(760) 434-5961
(408) 986-0424
(864) 963-6300
(714) 630-0081
(718) 956-8900
(408) 241-4588
(408) 432-1900
(800) 245-3984
(847) 696-2000
(800) 323-6864
(914) 576-6570
(602) 786-7200
(870) 453-8861
(617) 926-0404
(605) 886-4385
(800) 643-2661
(516) 922-6000
(718) 934-4500
(800) 441-2447
(770) 436-1300
(800) 831-9172
(770) 433-5789
(510) 324-4110
(408) 573-0933
(847) 843-7500
(602) 244-6600
(602) 921-3000
(714) 373-7334
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(201) 373-7334
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(914) 247-2036
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(619) 674-8100
(408) 720-1440
(800) 227-4856
(818) 765-8300
(336) 664-1233
(800) 726-8329
(619) 661-6835
(507) 532-3201
(707) 778-6311
(909) 464-1883
MOSFETS
SENSE RESISTORS
CAPACITORS
RF CONNECTORS
RF CONNECTORS
TANTALUM CAPS
CRG (CUST. RESPONSE)
SURGE SUPPRESSORS
JACKS, TURRETS
LEDS, DIODES
HIGH PERF. I.C.S
TOROID CORES ETC.
HIGH C/V CAPACITORS
ZIF SOCKETS
CRYSTAL OSCILLATORS
MICROCONTROLLER IC
NYLON STANDOFFS
DIODES
INDUCTORS
INDUCTORS
TURRETS
RF TRANSFORMERS
LOGIC, REGS
CAPS., INDUCTORS,
CRG (CUST. RESPONSE)
RF DEVICES
INDUCTORS/HI C/V CAPS
WHITE LEDS
ELECTROLYTIC CAPACITOR
DISCRETE DIODES ETC.
TERMINATORS
INDUCTORS, POLY CAPS
LEDS
SWITCHES
LOGIC IC
INDUCTORS
PLANAR INDUCTORS
DISCRETES, I.C.s
INDUCTORS
RF SWITCH
FUSES
METAL OXIDE RESISTORS
RF2138 / RF2140
WIRE JUMPERS
OSCON CAPS
INDUCTORS, XFORMERS
FUSES AND HOLDERS
DB9 CONNECTORS
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SIEMENS
SILICONIX
SILICONIX
SPRAGUE
SULLINS
SUMIDA
SUMIDA
TAIYO YUDEN
TAIYO YUDEN
TEKTRONIX
TEMIC
THERMALLOY
THIN FILM TECHNOLOGY
TOCOS
TOKIN (NEC)
TOKO
TOSHIBA
TOSHIBA
UNITED CHEMICON
VISHAY
VISHAY
VITRAMON
WIMA
ZETEX
ZIERICK
(108) 257-7910
(800) 554-5565
(408) 988-8000
(207) 324-4140
(760) 744-0125
(847) 956-0667
(408) 982-9660
(408) 573-4150
(800) 348-2496
(800) 835-9433
(408) 970-5700
(972) 243-4321
(507) 625-8445
(847) 884-6664
(510) 324-4110
(847) 699-3430
(714) 455-2000
(949) 455-2000
(847) 696-2000
(605) 665-9301
(605) 665-9301
(203) 268-6261
(914) 347-2474
(631) 366-5068
(800) 882-8020
OPTO
MOSFETS
MOSFETS
CAPACITORS
HEADERS, SHUNTS
INDUCTORS
INDUCTORS
CHIP CAPS / RES.
CRG (CUST. RESPONSE)
SCOPE PROBE SOCKETS
IR PHOTO DIODE
HEAT SINKS
THIN FILM CHIP RESISTORS
SMD POTENTIOMETERS
CAPS, INDUCTORS,
RF PRODUCTS
SINGLE GATE LOGIC
LOGIC
ELECTROLYTIC CAPACITOR
ZENER/SM. SIGNAL DIODES
INDUCTORS, SENSE Rs
CERAMIC CHIP CAPACITOR
PAPER/FILM CAPACITORS
SMALL SIGNAL DISCRETES
STAKED PINS
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