October 15, 2002 DC420A-A DEMO BOARD QUICK START GUIDE DESCRIPTION The DC420A-A contains the LTC4400-1 RF power controller chip and can be used to test the RF detector and controller characteristics. The LTC4400-1 is a power controller for fast turn-on RF power amplifiers. This demo board has been designed to demonstrate the power control capability of the LTC4400-1 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-A 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. DC 420 Demo Board Quick Start Guide 1of 9 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-A DC 420 Demo Board Quick Start Guide 2of 9 DC 420 Demo Board Quick Start Guide 3of 9 DC 420 Demo Board Quick Start Guide 4of 9 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 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 (605) 665-9301 (800) 421-6815 (805) 446-4800 (908) 542-7880 (310) 787-6300 (207) 775-4502 (408) 822-2126 (888) 522-5372 (717) 767-8005 (818) 765-8300 (201) 712-0555 (516) 847-3000 (716) 532-2234 (708) 354-1040 (800) 442-7747 (800) 235-0312 (408) 433-1990 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 DC 420 Demo Board Quick Start Guide 5of 9 IDT 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 (408) 727-6116 (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 (201) 348-5217 (201) 373-7334 (408) 435-0800 (914) 246-2811 (914) 247-2036 (508) 851-2200 (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 LOGIC IC 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 DC 420 Demo Board Quick Start Guide 6of 9 SIGNATRON 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 (909) 464-1883 (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 DB9 CONNECTORS 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 DC 420 Demo Board Quick Start Guide 7of 9 DC 420 Demo Board Quick Start Guide 8of 9 DC 420 Demo Board Quick Start Guide 9of 9