DEMO MANUAL DC1466B LTC2636 Octal 12-Bit SPI VOUT DACs with 10ppm/°C Internal Reference Description Demonstration circuit 1466B features the LTC®2636 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 SPI compatible interface. Design files for this circuit board are available at http://www.linear.com/demo/DC1466B L, LT, LTC, LTM, 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 Table 1. DEMO BOARD TYPE LTC2636 VARIATION (SUFFIX) POWER-UP OUTPUT FULL-SCALE OUTPUT VOLTAGE A LZ Zero 2.5V B LMI Mid-Scale 2.5V C HZ Zero 4.096V D HMI Mid-Scale 4.096V dc1466bf 1 DEMO MANUAL DC1466B Quick Start Procedure Connect DC1466B 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 QuikEval™ evaluation software supplied with DC590 or download it from www.linear.com/software. The correct control panel will be loaded automatically. The DAC is updated as changes are made to the GUI screen. Entering a voltage into a text box will cause the DAC's output to update immediately. Values may be entered in voltage, hexadecimal counts, or decimal counts by selecting the appropriate radio button. The reference mode may also be changed, and individual DACs can be powered down by unchecking the "Enable" box. Complete software documentation is available from the Help menu item, as features may be added periodically. Figure 2 2 dc1466bf DEMO MANUAL DC1466B Hardware Setup Analog Connections Digital Connections DAC Outputs – The eight DAC outputs from the LTC2636 are brought out to turrets labeled VOUTA through VOUTH. These may be connected to external instruments or other circuitry. LDAC – Load pin, active low, pulled to VCC by a 10k resistor. Updates the DAC register from the Input register. Do not assert this pin when using with the evaluation software. This pin can be used to update all DACs simultaneously, after individual input registers have been written to. DAC outputs are not in alphabetical order on the circuit board. REF – The REF turret is connected directly to the reference pin of the LTC2636. 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 evaluation software. CLR – Clear pin, active low, pulled to VCC by a 10k resistor. Asserting this pin clears all DACs to their default power-up value. Grounding and Power Connections Power (VCC) – Normally DC1466 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. dc1466bf 3 DEMO MANUAL DC1466B Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER Parts List – All Assembly Types 1 2 C1, C3 CAP., X5R, 0.1µF, 16V, 10%, 0402 AVX, 0402YD104KAT 2 1 C4 CAP., X7R, 0.1µF, 16V, 10%, 0603 AVX, 0603YC104KAT 3 1 C2 CAP., X5R, 10µF, 16V, 10%, 0805 AVX, 0805YD106KAT 4 13 E1–E13 TESTPOINT, TURRET, 0.065" MILL-MAX, 2308-2-00-80-00-00-07-0 5 1 J1 HEADER, 2×7 PIN, 0.079CC MOLEX, 87831-1420 6 2 R1, R2 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKEA 7 2 R3, R4 RES., CHIP, 10k, 1/16W, 1%, 0603 VISHAY, CRCW06010K0FKEA 8 1 U2 IC, EEPROM 2k BIT 400kHz 8 TSSOP MICROCHIP, 24LC025-I/ST 1 U1 LTC2636CMS-LZ12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-LZ12#PBF 1 U1 LTC2636CMS-LMI12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-LMI12#PBF 1 U1 LTC2636CMS-HZ12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-HZ12#PBF 1 U1 LTC2636CMS-HMI12#PBF, MSOP 16-PIN LINEAR TECH., LTC2636CMS-HMI12#PBF Parts List – DC1466B-A 2 Parts List – DC1466B-B 2 Parts List – DC1466B-C 2 Parts List – DC1466B-D 2 Board Revision History BOARD REV DATE A B 4 DESCRIPTION Original Design 10/13 Connected Floating Address Lines on ID EEPROM. dc1466bf 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 J1 5 NC EESCL EESDA EEGND EEVCC MISO MOSI/SDA SCK/SCL CS 5V VUNREG 14 11 9 12 10 5 7 4 6 2 1 HDR2X7-079-MOLEX C4 0.1uF SCK 8 LTC2636CMS - HZ12 LTC2636CMS - HMI12 -C -D 4 LTC2636CMS - LMI12 LTC2636CMS - LZ12 -B -A GND SDA SCL VCC A0 A1 A2 WP U2 24LC025-I/ST LTC PART# 4 5 6 R1 R2 4.99K 4.99K SDI U1 * Assy Table CS/LD 1 2 3 7 * 6 10 9 8 7 LDAC CLR SDI SCK CS/LD CUSTOMER NOTICE R4 10K U1 LTC2636- C3 3 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 2 HZ 2 SCALE = NONE Leo C. 15 14 13 C2 10uF DATE: N/A SIZE E1 1 Leo C. APPROVED DATE 10-10-12 1 LTC2636 FAMILY DEMO CIRCUIT 1466B Wednesday, September 04, 2013 IC NO. SHEET 1 OF 11 1 REV. 12-BIT, OCTAL SPI DAC WITH INTERNAL REFERENCE 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only LDAC CLR VOUTH VOUTG VOUTF VOUTE VOUTD VOUTC VOUTB VOUTA REF GND TECHNOLOGY E13 E12 E11 E10 E9 E8 E7 E6 E5 E4 E3 E2 PRODUCTION 1 1 VCC DESCRIPTION REVISION HISTORY REV ECO TITLE: SCHEMATIC C1 0.1uF 12 5 4 3 2 APPROVALS VOUTH VOUTG VOUTF VOUTE VOUTD VOUTC VOUTB VOUTA 0.1uF 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. R3 10K 3 REF D GND 13 GND 8 GND 3 4 Array EEPROM 1 VCC GND 16 11 GND 17 5 A B C D DEMO MANUAL DC1466B Schematic Diagram dc1466bf 5 DEMO MANUAL DC1466B 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 © 2004, Linear Technology Corporation 6 dc1466bf Linear Technology Corporation LT 0913 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013