DEMO MANUAL DC1678A LTC2654: Quad 16-Bit/12-Bit Rail-To-Rail SPI DACs with 10ppm/C Max Reference DESCRIPTION Demonstration circuit 1678A features the LTC2654 Quad 16-bit/12-bit DAC. The LTC2654 is a family of 16-bit/12-bit rail-to-rail DACs with integrated 10ppm/C maximum reference. The LTC2654 advances performance standards for output drive, crosstalk and load regulation in single supply, voltage-output multiple DACs. Design files for this circuit board are available at http://www.linear.com/demo L, LT, LTC, LTM, Module, 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. Connection Diagram Table 1. LTC2654 Demo board variations DEMO BOARD TYPE LTC2654 VARIATION FULL-SCALE VOLTAGE DC1678A-A LTC2654CUF-L16 2.5V DC1678A-B LTC2654CUF-H16 4.096V DC1678A-C LTC2654CUF-L12 2.5V DC1678A-D LTC2654CUF-H12 4.096V dc1678af 1 DEMO MANUAL DC1678A QUICK START PROCEDURE Connect the DC1678A to a DC590 USB serial controller using the supplied 14 conductor ribbon cable. Connect the DC590 to a host PC with a standard USB A/B cable. Run the QuikEval evaluation software supplied with the DC590 or download it from www.linear.com. The correct control panel will be loaded automatically. To update DAC value, fill in corresponding text box. Figure 1. Demo Board Setup dc1678af 2 DEMO MANUAL DC1678A QUICK START PROCEDURE HARDWARE SET-UP Jumpers REF - VREF Select. This jumper selects which mode the LTC2654 powers up in: External reference (EXT) or Internal reference (INT). PORSEL - Power Up Mode. The LTC2654 can be set to either power up in Mid Scale or Zero Scale. Analog Connections Grounding and Power Connections Power (VCC) - Normally the DC1678A 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 - There are 3 ground turrets provided (labeled GND), as well as ground strips on the top and the bottom of the board. DAC outputs - The 4 DAC outputs from the LTC2654 are brought out to turrets labeled VOUTA through VOUTD. These may be connected to external instruments or other circuitry. NOTE: DAC outputs are not in alphabetical order on the circuit board. VREF - The VREF turret is connected directly to the reference terminals of the LTC2654. The on-chip reference may be turned off, allowing the DAC reference pin to be driven from this turret. Alternatively, when the on-chip reference is on and active, the voltage can be monitored at this turret. V+ - Unregulated 10V is present here when a DC590 is connected. This turret is provided for monitoring purposes only and should not be connected to any other turrets on the board. dc1678af 3 DEMO MANUAL DC1678A PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Required Circuit Components 1 3 C1,C2,C3 Capacitor, X7R, 0.1F 16V, 0402 TDK, C1005X7R1C104K 2 1 C4 Capacitor, X7R, 0.047F 16V, 0402 TDK, C1005X7R1C473K 3 10 E1-E10 TP, Turret, 0.064" Mill-Max, 2308-2-00-80-00-00-07-0 4 2 JP1,JP2 Jumper, 3-Pin 1 Row 0.079CC Samtec, TMM-103-02-L-S 5 1 J1 Header, 2X7 Pin, 0.079CC Molex, 87831-1420 6 5 R1,R2,R3,R4,R5 Resistor, Chip 4.99k 1/16W 1%, 0402 NIC, NRC04F4991TRF 7 1 U2 IC, Serial EEPROM, TSSOP8 Microchip, 24LC025-I /ST 8 2 Shunts as Shown Shunt, 0.079" Center on Assy Dwg Samtec, 2SN-BK-G U1-A IC, LTC2654CUF-L16, QFN20UF 4mm x 4mm Linear Technology, LTC2654CUF-L16 U1-B IC, LTC2654CUF-H16, QFN20UF 4mm x 4mm Linear Technology, LTC2654CUF-H16 U1-C IC, LTC2654CUF-L12, QFN20UF 4mm x 4mm Linear Technology, LTC2654CUF-L12 U1-D IC, LTC2654CUF-H12, QFN20UF 4mm x 4mm Linear Technology, LTC2654CUF-H12 dc1678af 4 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 E4 E3 E2 1 2 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX V+ 5V J1 HD2X7-079-MOLEX GND V+ VCC E1 4 3 2 1 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. 5 2. INSTALL SHUNTS AS SHOWN. R3 4.99K INT 6 10 9 7 C1 0.1uF C4 0.047uF SDO SDI SCK CS C2 VCC 0.1uF 1 2 3 CUSTOMER NOTICE R4 R5 4.99K 4.99K EXT JP1 REF 3 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. R2 4.99K SCALE = NONE LEO C. KT APPROVALS VCC DATE: N/A SIZE DESCRIPTION ASSY -A -B -C -D IC NO. 1 SHEET 1 LTC2654CUF FAMILY DEMO CIRCUIT 1678A Wednesday, August 11, 2010 2 DATE 08-11-10 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only -BIT 16 16 12 12 GND VOUTD VOUTC VOUTB VOUTA GND LEO C. APPROVED 1 OF 1 2 REV. QUAD 12/16-BIT RAIL-TO-RAIL SPI DAC WITH 10ppm/ O C MAX REFERENCE TECHNOLOGY E9 14 E10 E8 E6 E5 13 U1 LTC2654CUF-L16 LTC2654CUF-H16 LTC2654CUF-L12 LTC2654CUF-H12 PRODUCTION E7 * 2 REV REVISION HISTORY 3 1 U1 _ ECO 2 TITLE: SCHEMATIC * VOUTD VOUTC VOUTB VOUTA LDAC CLR R1 4.99K VCC JP2 PORSEL 1 MS 2 3 ZS 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 PCB DES. VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL APP ENG. APPLICATION. COMPONENT SUBSTITUTION AND PRINTED CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. U2 24LC025-I /ST 8 A0 VCC 7 A1 WP 6 A2 SCL 5 VSS SDA C3 0.1uF CS/ CLK SDI SDO NOTES: UNLESS OTHERWISE SPECIFIED V+ VCC 4 21 VREF GND GND GND 13 8 3 18 VCC 20 GND 2 REFCOMP GND 19 DNC 17 REFLO 4 REFIN/OUT 5 LDAC 16 DNC 11 CLR 12 PORSEL DNC 15 DNC 8 5 A B C D DEMO MANUAL DC1678A SCHEMATIC DIAGRAM dc1678af 5 DEMO MANUAL DC1678A 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 dc1678af 6 Linear Technology Corporation LT 0211 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com (c) LINEAR TECHNOLOGY CORPORATION 2011