DEMO MANUAL DC50A DESCRIPTI Demonstration circuit DC50A is an Isolated RS85/ RS μmodule transceiver + power featuring the LTM 88. The demo circuit is a 500V RMS galvanically isolated RS85/RS transceiver interface. All components are integrated into the μmodule transceiver. The demo circuit operates from a supply on V CC and a logic LTM88: Isolated 0Mbps RS85/RS µmodule Transceiver with Power supply on V L. The part generates the output voltage V CC and communicates all necessary signaling across the isolation barrier using isolation μmodule technology. Design fi les for this circuit board are available at http://www.linear.com/demo. L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Table. Performance Summary (T A = 5 C) SYMBOL PARAMETER CDITIS MIN TYP MAX UNITS V CC Input Supply Range LTM88-5 LTM88- V L Logic Signal Supply Range.6 5.5 V V CC Output Voltage I LOAD = 0mA to 00mA, DE = 0V.7 5 V f MAX Maximum Data rate SLO = V CC 0 Mbps V IORM Maximum Working Insulation Voltage to 560 V Common Mode Transient Immunity to 0 kv/μs.5.0 5 5.5.6 V V OPERATING PRINCIPLES The LTM88 contains an isolated DC/DC converter, delivering power to V CC at 5V from the input supply V CC. Isolation is maintained by the separation of and where significant operating voltages and transients can exist without affecting the operation of the LTM88. The logic side pin enables or shuts down the LTM88. RS85/RS signaling is controlled by the logic inputs DE, DI, TE and RE. Connection to the transceiver pins (A, B, Y and Z) allows full- or half-duplex operation on the isolated side of the demo circuit. A full-/half-duplex switch is included on the demo circuit to ease setting the system configuration. A driver termination resistor is included on the demo circuit to allow master termination in full-duplex configurations. Additional logic signaling from the isolated side to the logic side is available with the D IN to D OUT pins. The SLO pin configures the slew rate of the driver output pins Y and Z. Data is transmitted out the driver pins Y and Z from the input DI with the input DE set high. Data is received through the difference in A and B to the output RO with the input RE set low. dc50fa
DEMO MANUAL DC50A QUICK START PROCEDURE Demonstration circuit DC50A is easy to set up to evaluate the performance of the LTM88. Refer to Figure for proper measurement equipment setup and follow the procedure below: Use a short ground lead on the oscilloscope probe when measuring input or output voltage ripple or high speed signals.. Place jumpers in the following positions: (all are default except JP, JP, JP6 and JP8) JP JP V CC (Note: Logic signals referenced to V CC ) JP JP OUT JP5 JP6 JP7 JP8 JP9 JP0 FAST JP HI SW HALF DUPLEX. With power off, connect the input power supply to V CC and.. Turn on the power at the input. Note: Make sure that the input voltage does not exceed 6V.. Check for the proper output voltages. V CC = 5V, LED D is On, LED D is On. 5. Once the proper output voltages are established, connect a function generator to terminal DI and set to square wave with a low of 0V, high = V CC, termination is Hi-Z. Set Frequency to 0MHz (0Mbps). Enable output of function generator. 6. Connect oscilloscope to terminal RO and observe waveform at 0MHz. This demonstration shows data that transmits from DI, loops back through the half-duplex configuration, and out of RO. RO V/DIV 50ns/DIV DC50 F0 Figure. RO Output dc50fa
DEMO MANUAL DC50A QUICK START PROCEDURE Figure. Proper Measurement Equipment Setup dc50fa
DEMO MANUAL DC50A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTI MANUFACTURER/PART NUMBER REQUIRED CIRCUIT COMPENTS U I.C., LTM88CV- I.C., LTM88CV-5 HARDWARE (FOR DEMO BOARD LY) LINEAR LTM88CV-#PBF LINEAR LTM88CV-5#PBF CIN, CIN CAP., TANT 6.8μF 6V 0% TAJA AVX TAJA685K06R D, D LED, SMT, GREEN,.V 5mA PANASIC LN5C-(TR) R RES., CHIP k /6W, 5%, 060 VISHAY, CRCW060K00JNEA 5 R RES., CHIP.k /6W, 5%, 060 VISHAY, CRCW060K0JNEA 6 R RES., CHIP 0Ω /W, 5%, 06 VISHAY, CRCW060RJNEA 7 SW SWITCH, SLIDE, DPDT E-SWITCH, EG7 8 J TERMINAL BLOCK, 5-PIN.5mm -SHORE TECH ED555/5DS 9 5 JP-JP, JP0 mm SINGLE ROW HEADER, PIN SAMTEC, TMM-0-0-L-S 0 6 JP5-JP9, JP mm DOUBLE ROW HEADER, 6 PIN SAMTEC, TMM-0-0-L-D JP-JP SHUNT SAMTEC, SN-BK-G 5 TP-TP5 TEST POINT, TURRET, 0.095 MILL-MAX, 50--00-80-00-00-07-0 TP7-TP8 TEST POINT, TURRET, 0.065 MILL-MAX, 08--00-80-00-00-07-0 (Stand-Off) STAND-, NYL 0.75" tall KEYSTE, 88 (SNAP ) dc50fa
DEMO MANUAL DC50A SCHEMATIC DIAGRAM ISOLATI BOUNDARY * VL.6V - 5.5V 6V 6V LED JP LOGIC SUPPLY VL A A TP7 JP RO TP TP0 HI LOW JP9 RO JP8 RE JP7 DI JP6 TE JP5 * LED OUT IN R.K DRIVER TERMINATI D LED DUPLEX FULL-HALF A B +5VOUT TE TP TP CIN 6.8uF D LED + U + RE TP TP CIN 6.8uF B8 K8 A8 L8 B7 K7 A7 VL L7 B6 K6 A6 RO A L6 B5 K5 A5 RE B L5 B K A DE Z L B K A DI Y L B K A TE SLO L B K A DOUT DIN L JP R 0 TP5 SHIELD Y Z TP8 TP9 TP5 TP7 A B Z Y JP0 JP SLO DIN HI FAST SLOW LOW B B DE TP R.K JP J SW TP 5 65 DI TP DOUT TP6 DIN TP8 BOARD ASSEMBLY * ASSY - A - B U LTM88CV- LTM88CV-5.0V-.6V.5V-5.5V CTRACT NO. APPROVALS DATE DRAWN HELEN 8/5/08 CHECKED APPROVED ENGINEER BRIAN J. 8/5/08 DESIGNER TITLE SIZE TECHNOLOGY 60 McCarthy Blvd. Milpitas, CA 9505 Phone: (08)-900 Fax: (08)-0507 ISOLATED 0Mbps RS85 umodule R TRANSEIVER WITH POWER CAGE CODE DWG NO REV DC50A-A/B, LTM88CV-/-5 Wednesday, September 0, 009 SCALE: FILENAME: SHEET OF Information furnished by Linear Technology Corporation is believed to be accurate and reliable. However, no responsibility is assumed for its use. Linear Technology Corporation makes no representation that the interconnection of its circuits as described herein will not infringe on existing patent rights. dc50fa 5
DEMO MANUAL DC50A DEMSTRATI BOARD IMPORTANT NOTICE Linear Technology Corporation (LTC) provides the enclosed product(s) under the following AS IS conditions: This demonstration board (DEMO BOARD) kit being sold or provided by Linear Technology is intended for use for ENGINEERING DEVELOPMENT OR EVALUATI PURPOSES LY and is not provided by LTC for commercial use. As such, the DEMO BOARD herein may not be complete in terms of required design-, marketing-, and/or manufacturing-related protective considerations, including but not limited to product safety measures typically found in finished commercial goods. As a prototype, this product does not fall within the scope of the European Union directive on electromagnetic compatibility and therefore may or may not meet the technical requirements of the directive, or other regulations. If this evaluation kit does not meet the specifications recited in the DEMO BOARD manual the kit may be returned within 0 days from the date of delivery for a full refund. THE FOREGOING WARRANTY IS THE EXCLUSIVE WARRANTY MADE BY THE SELLER TO BUYER AND IS IN LIEU OF ALL OTHER WARRANTIES, EXPRESSED, IMPLIED, OR STATUTORY, INCLUDING ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR ANY PARTICULAR PURPOSE. EXCEPT TO THE ENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CSEQUENTIAL DAMAGES. The user assumes all responsibility and liability for proper and safe handling of the goods. Further, the user releases LTC from all claims arising from the handling or use of the goods. Due to the open construction of the product, it is the user s responsibility to take any and all appropriate precautions with regard to electrostatic discharge. Also be aware that the products herein may not be regulatory compliant or agency certified (FCC, UL, CE, etc.). No License is granted under any patent right or other intellectual property whatsoever. LTC assumes no liability for applications assistance, customer product design, software performance, or infringement of patents or any other intellectual property rights of any kind. LTC currently services a variety of customers for products around the world, and therefore this transaction is not exclusive. Please read the DEMO BOARD manual prior to handling the product. Persons handling this product must have electronics training and observe good laboratory practice standards. Common sense is encouraged. This notice contains important safety information about temperatures and voltages. For further safety concerns, please contact a LTC application engineer. Mailing Address: Linear Technology 60 McCarthy Blvd. Milpitas, CA 9505 Copyright 00, Linear Technology Corporation 6 LT 050 PRINTED IN USA Linear Technology Corporation 60 McCarthy Blvd., Milpitas, CA 9505-77 (08) -900 FAX: (08) -0507 www.linear.com LINEAR TECHNOLOGY CORPORATI 00 dc50fa