DEMO MANUAL DC2870A LTC5596 Linduino Shield 100MHz to 40 GHz RMS Power Detector DESCRIPTION Demonstration circuit DC2870A is a Linduino(R) shield for Mean-Squared Power Detector LTC(R)5596. It is set up for quick evaluation of RMS RF power measurement using the Arduino/Linduino compatible platform and software download available here. When connected to PC with USB cable, accurate power level can be monitored using the graphic user interface. The LTC5596 is a wide dynamic range linear-in-dB Mean Squared RF Power Detector, operational from 100MHz to 40GHz. The Linduino (DC2026C) platform provides 10-bit ADC at 4.9mV/LSB resolution with 5V default reference voltage. Input dynamic range with 1dB accuracy is up to 35dB depending on frequency. The detector output slope is normally 6 LSB/dB. The DC2870A Demo Circuit is optimized for wide operational frequency signals up to 40GHz using the 2.9mm SMK edge mount connector. Input impedance is internally matched to 50. It is suitable for RMS measurements of high crest factor waveforms up to 12dB peak-to-average. No external coupling capacitor is necessary if DC voltage at RFIN pin is kept below 1.0V. On board 3.3V regulator provides power to All registered trademarks and trademarks are the property of their respective owners. the shield by jumper JP1. Contact applications support for more information. Design files for this circuit board are available. ABSOLUTE MAXIMUM INPUT RATINGS (Note 1) Supply Voltage(VCC):+3.8V -0.3V to 1.0V DC Voltage at RFIN: -0.3V to 0.4V DC Voltage at FLTR: -0.3V to 3.8V DC Voltage at EN: RFIN Input Power-Average:+15dBm 150C TJMAX Case Operating Temperature Range -40C to 105C Storage Temperature Range -65C to 150C Note 1: Voltage on all pins must not exceed VCC +0.3V or be less than -0.3V. CAUTION: This part is sensitive to electrostatic discharge (ESD). Observe proper ESD precautions when handling the LTC5596. TEST SETUP Figure1. Test Setup for RF Performance Measurements Rev. 0 1 DEMO MANUAL DC2870A NOTES ON TEST EQUIPMENT AND SETUP Use a high performance signal generator with accurate output power levels up to 40GHz, such as Rohde Schwarz SMF100A. n Demo Board DC2870A includes the SMK 2.9mm connector for best performance up to 40GHz. n Connecting cable for RF signal should be rated up to 40GHz for the best performance. n Optional input attenuation can be used to improve return loss, but also shifts the log intercept point accordingly. n QUICK START PROCEDURE 1. Remove the DC2870A from its protective packaging in an ESD-safe working area, connect USB cable to PC(see Figure1). 6. Connect USB cable from PC to Linduino board. Connect the RF input to the signal generator at the 2.92mm connector 2. Set JP1 which provides the 3.3V to VCC by the on board regulator. 7. Set the frequency and power level (less than +10dBm) of the signal generator. 3. Go to www.analog.com, download and install QuikEval if it's not yet installed. 8. Open LTC5596 GUI, and set the frequency of signal to be measured. Push "READ" to measure RF power. Using the default calibration would be loading the nominal slope and intercept from LTC5596 data sheet values. See Figure3. 4. The Eval Kit comes with a Linduino board pre-loaded with firmware. Follow Figure2 to re-load the firmware if necessary, which can be downloaded from www. analog.com. 5. Download LTC5596 GUI, and install all necessary drivers onto PC from the LTC5596 product page. Follow instruction from QuikEval which will automatically download the GUI. 9. For higher accuracy, Calibration can be performed using the GUI at various frequency with two point calibration. Set input power level to the corresponding calibration points on the GUI, and calibrate accordingly by clicking the corresponding button. 10. Read RF power using the GUI. DEMO BOARD USAGE NOTES 1. Demo Board DC2870A has provisions for inter-stage filter cap. Additional capacitor (C3) can be added to slow down the transient response to reduce the output ripple. The range for C3 is 10pF to 1nF. 2. Output power is calculated using slope and intercept. 2 3. ADC count * 4.9mV/slope+intercept=output power. Slope is derived from two point calibration in the linear region of transfer function. 4. A minimum two point calibration is necessary for most applications. Additional calibration points will improve the accuracy of the power detection. Rev. 0 DEMO MANUAL DC2870A DEMO BOARD USAGE NOTES Figure2. Firmware Re-Load (Only If Necessary) Figure3. GUI Figure4. Calibration Rev. 0 3 DEMO MANUAL DC2870A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 1 C1 CAP., CX Series, (16kHz to 40GHz), 0.1F, YD, 16V, 10%, 0402 AVX, CX02YD104KAT2 2 2 C3, C14 CAP., 0.01F, X7R, 16V, 10%, 0402 MURATA, GRM155R71C103KA01D NIC, NMC0402X7R103K16TRPF 3 1 C4 CAP., 1F, X5R, 10V, 10%, 0402 MURATA, GRM155R61A105KE15D AVX, 0402ZD105KAT2 TDK, C1005X5R1A105K050BB 4 1 C8 CAP., 10pF, NP0, 50V, 10%, 0402 AVX, 04025A100KAT2A 5 0 C10 CAP., OPTION, 0402 6 2 C11, C15 CAP., 0.1F, X7R, 16V, 10%, 0402 AVX, 0402YC104KAT2A Taiyo Yuden, EMK105B7104KV-F TDK, C1005X7R1C104K050BC 7 2 C12, C13 CAP CER 10UF 6.3V X5R 0402 TDK Corporation, C1005X5R0J106M050BC 8 5 E1, E2, E3, E4, E5 TEST POINT, TURRET, 0.064", MTG. HOLE MILL-MAX, 2308-2-00-80-00-00-07-0 9 1 J1 CONN., SMA, 2.9mm, JACK TO EDGE LUNCH, DC-40GHz SRI CONNECTOR GAGE, 25-146-1000-93 10 1 J2 CONN., HDR, FEMALE, 1x10, 2.54mm, THT, STR SULLINS CONNECTOR SOLUTIONS, PPPC101LFBN-RC 11 2 J3, J4 CONN., HDR, FEMALE, 1x8, 2.54mm, STR, THT SULLINS CONNECTOR SOLUTIONS, PPPC081LFBN-RC 12 1 J5 CONN., HDR., FEMALE, 1x6, 2.54mm, THT, STR SULLINS CONNECTOR SOLUTIONS, PPPC061LFBN-RC 13 1 J6 CONN., TERM. BLOCK, RCPT, 1x2, 5mm, SIDE ENTRY, THT TE CONNECTIVITY, 282836-2 14 2 JP1, JP2 CONN., HDR, MALE, 1x2, 2mm, VERT, STR, THT, 10u" AU SAMTEC, TMM-102-02-L-S 15 1 LB1 LABEL SPEC, DEMO BOARD SERIAL NUMBER BRADY, THT-96-717-10 16 1 PCB1 PCB, DC2870A ANALOG DEVICES INC., 600-DC2870A 17 1 R1 RES., AEC-Q200, 2k OHMS, 1%, 1/16W, 0402 VISHAY, CRCW04022K00FKED NIC, NRC04F2001TRF 18 1 R2 RES., 1 OHM, 1%, 1/16W, 0402 VISHAY, CRCW04021R00FKED 19 0 R8, R14 RES., OPTION, 0402 20 3 R9, R10, R11 RES., 4.99k OHMS, 1%, 1/16W, 0402 NIC, NRC04F4991TRF VISHAY, CRCW04024K99FKED YAGEO, RC0402FR-074K99L 21 1 R12 RES., 100 OHMS, 1%, 1/16W, 0402 NIC, NRC04F1000TRF YAGEO, RC0402FR-07100RL 22 1 R13 RES., 3k OHMS, 5%, 1/16W, 0402 VISHAY, CRCW04023K00JNED 23 1 STNCL1 TOOL, STENCIL, 700-DC2870A ANALOG DEVICES INC., 830-DC2870A 24 1 U1 IC, 100MHz to 40GHz Linear-in-dB RMS Power Detector with 35dB Dynamic Range LINEAR TECH, LTC5596_DC#PBF 25 1 U2 IC, LOW NOISE, LDO MICROPOWER REG., TSOT23-5 LINEAR TECH., LT1761ES5-3.3#PBF LINEAR TECH., LT1761ES5-3.3#TRPBF 26 1 U3 IC, MEMORY, EEPROM, 2Kb (256x8), TSSOP-8, 400kHz MICROCHIP, 24LC025-I/ST MICROCHIP, 24LC025T-I/ST 4 Rev. 0 A B C D C13 10uF SHDN IN 2 1 2 1 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Specifications subject to change without notice. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. REV01 1. ALL RESISTORS ARE IN OHMS, 0402 2. ALL CAPACITORS ARE IN MICROFARADS, 0402 NOTE: UNLESS OTHERWISE SPECIFIED 5 WP SCL SDA A1 A2 VSS VCC A0 4 5V 3.3V U3 24LC025-I/ST 4 3 2 1 GND 3.3V EN 5 6 7 8 EGND C11 0.1uF J4 HDR-FEMALE C12 10uF JP1 HDR C15 0.1uF AREF E3 C14 0.01uF GND 4 5 1 PCA ADDITIONAL PARTS 3.3V BYP VOUT U2 LT1761-S5-3.3 TE-282836-2 TERM. BLOCK J6 3 1 2 JP2 HDR J2 HDR-FEMALE LB1 LABEL PCB1 PCB, DC2870A REV01 STNCL1 TOOL, STENCIL, 700-DC2870A 5V 3.3V GND 2 10 9 8 7 6 5 4 3 2 1 E2 E1 R8 OPT CUSTOMER NOTICE ANALOG IN DIGITAL C4 1uF 10V APPROVALS 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. SIZE: N/A EN GND RFin GND ANALOG DEVICES GND FLTR OUT VCC 2 DATE: C8 10pF R1 2k www.analog.com R13 3k J1 25-146-1000-93 DC-40GHz 1 SHEET 1 OF 710-DC2870A_REV01 SCHEMATIC NO. AND REVISION: RMS POWER DETECTOR 1 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 1 TITLE: DEMO CIRCUIT SCHEMATIC, TM 5 6 7 8 PCA BOM: 700-DC2870A_REV01 PCA ASS'Y: 705-DC2870A_REV01 SCALE = NONE DC2870A SKU NO. 4 3 2 1 U1 LTC5596_DC J3 HDR-FEMALE 2 AHEAD OF WHAT'S POSSIBLE C3 0.01uF C1 0.1uF 40GHz R12 100 X3 J5 HDR-FEMALE R14 OPT 1 X2 A0 R2 SDA EN R10 4.99k 3 8 7 6 5 4 3 2 1 LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A AK CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; PCB DES. HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO APP ENG. ANDY M. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED IC NO. CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR LTC5596 TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. POWER E5 C10 OPT R11 4.99k SCL 3.3V VOUT X1 R9 4.99k 5V E4 1 2 3 4 5 6 7 8 GND 9 4 1 2 3 4 5 6 5 A B C D DEMO MANUAL DC2870A SCHEMATIC DIAGRAM Rev. 0 5 DEMO MANUAL DC2870A ESD Caution ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality. 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