DEMO MANUAL DC1534A LTC2637: Octal 12-Bit DAC with Internal Reference DESCRIPTION Demonstration circuit DC1534A features the LTC2637 Octal 12-bit DAC. This device has an integrated, high accuracy, low-drift reference. It has a rail-to-rail output buffer and is guaranteed monotonic. This DAC communicates through the simple I2C compatible interface. Design files for this circuit board are available at 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. ANALOG OUTPUTS TO DC590 Figure 1. LTC2637 VARIATION POWER UP FULL-SCALE DAC OUTPUT (Int. Reference Mode) DC1534A-A LZ Zero-Scale 2.5V DC1534A-B LMI Mid-Scale 2.5V DC1534A-C HZ Zero-Scale 4.096V DC1534A-D HMI Mid-Scale 4.096V DEMOBOARD ASSEMBLY dc1534af 1 DEMO MANUAL DC1534A QUICK START PROCEDURE Connect DC1534A to a DC590 USB serial controller using the supplied 14 conductor ribbon cable. Connect DC590 to a host PC with a standard USB A/B cable. Run the evaluation software supplied with DC590 or download it from www.linear.com. The correct control panel will be loaded automatically. Click the COLLECT button to begin outputting codes to the DACs. Complete software documentation is available from the Help menu item, as features may be added periodically. NOTE: DAC outputs are not in alphabetical order on the circuit board. VREF - The REF turret is connected directly to the reference terminals of the LTC2637. When the integrated reference is being used, the reference voltage may be monitored at this point. An external reference may also be applied to this turret after changing the setting in the QuickEval software. Grounding and Power Connections HARDWARE SET-UP Analog Connections DAC outputs - The eight DAC outputs from the LTC2637 are brought out to turrets labeled VOUTA through VOUTH. These may be connected to external instruments or other circuitry. Power (VCC) - Normally DC1534A is powered by the DC590 controller. VCC can be supplied to this turret, however the power supply on DC590 must be disabled! Refer to DC590 Quick Start Guide for more details on this mode of operation. Grounding - Ground turrets as well as 2 grounding strips are provided. Figure 2. dc1534af 2 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. A B C D * A2 A1 A0 U2 VCC 8 WP 7 R3 4.99k SCL 6 4 VSS SDA 5 24LC025-I /ST 3 2 1 C4 0.1uF U1 LTC2637IMS - LZ12 LTC2637HMS - LMI12 LTC2637CMS - HZ12 LTC2637HMS - HMI12 10 9 11 12 14 SCK SDA 5 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0603. ALL CAPACITORS ARE IN MICROFARADS, 0603. NOTES: UNLESS OTHERWISE SPECIFIED ASSY -A -B -C -D EEVCC EESDA EESCL EEGND AUX V+ 12 5V CS 64 SCK/SCL MOSI/SDA 75 MISO J1 HD2X7-079-MOLEX GND GND GND 13 8 3 VCC 1 2 3 0 1 JP3 CA2 1 2 3 VCC 6 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. KIM T. DESIGNER: ENGINEER: LEO C. APPROVED: CHECKED: DRAWN: APPROVALS 0 1 VCC LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. 1 2 3 JP2 CA1 10 7 9 8 * DATE: A SIZE TITLE: CA2 CA1 CA0 SDA SCL U1 LTC2637 CONTRACT NO. 0 1 VCC R5 4.99k JP1 CA0 R4 4.99k 3 CUSTOMER NOTICE 4 VCC 1 2 14 VOUTH 15 VOUTG VOUTF 13 VOUTE 12 VOUTD 5 VOUTC 4 VOUTB 3 2 REF GND VCC VH VG 1 SHEET DC1534A - LTC2637 1 OF 1 A REV 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 LTC Confidential-For Customer Use Only E13 GND E11 VF VE VD VC VB VA E10 E9 E8 E7 E6 E5 E4 E12 GND E3 E2 E1 1 OCTAL 12-BIT I2C VOUT DAC WITH 10PPM/DEGREE C REFERENCE Tuesday, February 24, 2009 DWG NO. C3 0.1uF 0402 C2 10uF 0805 VOUTA 2 C1 0.1uF 0402 TECHNOLOGY SCHEMATIC GND 16 REF 11 GND 17 5 A B C D DEMO MANUAL DC1534A SCHEMATIC DIAGRAM dc1534af 3 DEMO MANUAL DC1534A DEMONSTRATION 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 EVALUATION PURPOSES ONLY 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 30 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 EXTENT OF THIS INDEMNITY, NEITHER PARTY SHALL BE LIABLE TO THE OTHER FOR ANY INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL 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 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright (c) 2004, Linear Technology Corporation dc1534af 4 Linear Technology Corporation LT 1109 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2009