DEMO MANUAL DC1703A LTC2655: Quad I2C 16-/12-Bit Rail-to-Rail DACs with 10ppm/C Max Reference Description Demonstration circuit 1703A features the LTC(R)2655 quad 16-/12-bit DAC. The LTC2655 is a family of 16-/12- bit rail-to-rail DACs with integrated 10ppm/C maximum reference. The LTC2655 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 and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. Analog Outputs To DC590 Figure 1. Connection Diagram Table 1. LTC2655 Demo Board Variations DEMO BOARD TYPE LTC2655 VARIATION FULL-SCALE VOLTAGE DC1703A-A LTC2655CUF-L16 2.5V DC1703A-B LTC2655CUF-H16 4.096V DC1703A-C LTC2655CUF-L12 2.5V DC1703A-D LTC2655CUF-H12 4.096V dc1703af 1 DEMO MANUAL DC1703A quick start procedure Connect the DC1703A 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 QuikEvalTM evaluation software supplied with the DC590 or download it from www.linear.com. The correct control panel will be loaded automatically. In order to update the DAC output value, fill in desired output code inside the corresponding DAC box. Figure 2. Demo Board Setup dc1703af 2 DEMO MANUAL DC1703A Hardware Set-Up Jumpers REF: VREF Select. This jumper selects which mode the LTC2655 powers up in: external reference (EXT) or internal reference (INT). PORSEL: Power-Up Mode. The LTC2655 can be set to either power-up in mid-scale or zero-scale. CA2, CA1, CA0: Address Selection Jumpers. These jumpers are used to select the I2C address of the DAC. Any changes here should also be made in the QuikEval software. Analog Connections DAC Outputs: The 4 DAC outputs from the LTC2655 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 LTC2655. 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. Grounding and Power Connections Power (VCC): Normally the DC1703A 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. dc1703af 3 DEMO MANUAL DC1703A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER, PART NUMBER 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 5 JP1-JP5 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 4 R1, R2, R3, R4 Resistor., Chip 4.99K 1/16W 1%,0402 NIC, NRC04F4991TRF 7 1 U2 IC, Serial EEPROM, TSSOP8 Microchip, 24LC025-I /ST 8 5 Shunts as Shown on Assembly Drawing Shunt, 0.079" Center Samtec, 2SN-BK-G 9 1 Stencil Top Side Only Stencil, 1703A U1-A IC, LTC2655CUF-L16, 4mm x 4mm QFN20UF Linear Technology, LTC2655CUF-L16 U1-B IC, LTC2655CUF-H16, 4mm x 4mm QFN20UF Linear Technology, LTC2655CUF-H16 U1-C IC, LTC2655CUF-L12, 4mm x 4mm QFN20UF Linear Technology, LTC2655CUF-L12 U1-D IC, LTC2655CUF-H12, 4mm x 4mm QFN20UF Linear Technology, LTC2655CUF-H12 dc1703af 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 1 2 ASSY -A -B -C -D R2 4.99K 1 -BIT 16 16 12 12 U2 24LC025-I /ST 8 A0 VCC 2 7 A1 WP 3 6 A2 SCL 4 5 VSS SDA C3 0.1uF SCL SDA U1 LTC2655CUF-L16 LTC2655CUF-H16 LTC2655CUF-L12 LTC2655CUF-H12 6 CS 4 SCK/SCL 7 MOSI/SDA 5 MISO 10 EEVCC 9 EESDA 11 EESCL 12 EEGND 14 AUX V+ 5V V+ VCC 5 2. INSTALL SHUNTS AS SHOWN. 1. ALL RESISTORS ARE IN OHMS, 0402. ALL CAPACITORS ARE IN MICROFARADS, 0402. NOTES: UNLESS OTHERWISE SPECIFIED * E3 J1 HD2X7-079-MOLEX GND VCC E2 VCC 1 2 3 C2 VCC 0.1uF C1 0.1uF VCC GND CA0 CA1 CA2 SDA SCL JP3 CA0 11 10 6 9 7 1 2 3 C4 0.047uF 4 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 1 2 3 JP4 CA1 SCALE = NONE LEO C. KT LDAC R1 4.99K VCC APPROVALS 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. CUSTOMER NOTICE R3 R4 4.99K 4.99K INT EXT JP1 REF 3 2 E1 4 5 VREF GND GND GND 13 8 3 18 VCC GND 21 REFCOMP REFLO 20 4 REFIN/OUT GND 19 LDAC VCC 1 2 3 JP5 CA2 DATE: N/A SIZE IC NO. JP2 PORSEL MS ZS GND VOUTD VOUTC VOUTB VOUTA GND 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only 1 SHEET 1 LTC2655CUF FAMILY DEMO CIRCUIT 1703A Thursday, November 11, 2010 2 DATE 11-11-10 OF 1 2 REV. QUAD 12/16-BIT RAIL-TO-RAIL I2C DAC WITH 10ppm/ O C MAX REFERENCE TECHNOLOGY VCC GND 1 2 3 E9 14 E4 E8 13 E6 E5 LEO C. APPROVED 1 E7 * U1 2ND PROTOTYPE DESCRIPTION REVISION HISTORY 3 1 2 REV VCC VOUTD VOUTC VOUTB VOUTA _ ECO 2 TITLE: SCHEMATIC VCC GND PORSEL 12 17 DNC 16 DNC DNC 8 DNC 15 5 A B C D DEMO MANUAL DC1703A Schematic Diagram dc1703af 5 DEMO MANUAL DC1703A 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 dc1703af 6 Linear Technology Corporation LT 0511 * PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 FAX: (408) 434-0507 www.linear.com LINEAR TECHNOLOGY CORPORATION 2011