DEMO MANUAL DC1397B LTC2656 16-Bit, Octal Rail-to-Rail DAC with 10ppm/°C Max Reference DESCRIPTION Demonstration circuit 1397B features the LTC®2656 Octal 16-bit DAC with ±4LSB INL error. This device establishes a new board-density benchmark for 16-bit DACs and advances performance standards for output drive, crosstalk and load regulation in single supply, voltage-output multiple DACs. The DC1397B has many features for evaluating the performance of the LTC2656. An external 1.25V precision reference is provided. Another feature of this board is the onboard LTC2428 20-bit delta-sigma ADC for monitoring the DAC output voltage. The 16ppm total error of this device is adequate for taking meaningful measurements of various LTC2656 parameters. Design files 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. TO DC590 ANALOG OUTPUT Figure 1. DC1397B Connection Diagram PERFORMANCE SUMMARY PARAMETER Resolution Monotonicity Differential Nonlinearity Integral Nonlinearity Load Regulation DC Crosstalk DEMO BOARD TYPE DC1397B-A DC1397B-B Specifications are at TA = 25°C CONDITION VCC = 5V VCC = 5V VCC = 5V VCC = 5V, Mid-Scale, IOUT = ±15mA Due to Load Current Change on Any Other Channel LTC2656 VARIATION LTC2656BCUFD-L16 LTC2656BCUFD-H16 VALUE 16 Bits 16 Bits ±1LSB Maximum ±4LSB Maximum 2LSB/mA Maximum 3.5µV/mA FULL SCALE 2.5V 4.096V dc13297bf 1 DEMO MANUAL DC1397B QUICK START PROCEDURE Connect DC1397B 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/software. The correct control panel will be loaded automatically. Click the COLLECT button to begin outputting codes to the DACs and reading back the resulting output voltage for each DAC. Complete software documentation is available from the Help menu item, as features may be added periodically. Figure 2. Demo Board Software dc1397bf 2 DEMO MANUAL DC1397B HARDWARE SETUP Jumpers Grounding and Power Connections JP1 – VREF Select. Either a 1.25V/2.048V internal or 1.25V onboard reference can be selected. To apply an external reference through the VREF turret, set jumper to EXT. Power (VCC) – Normally DC1397B 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. JP2 – Power-Up Mode. The LTC2656 can be set to either power up at Mid-Scale or Zero-Scale. JP3 – ADC Disable. Set to ON for normal operation, with the onboard ADC enabled. For very sensitive noise measurements, the ADC may be disabled. The software will then display a positive full-scale reading. Grounding – Signal ground is connected to the exposed ground planes at the top and bottom edges of the board, and to the two turrets labeled “Gnd.” Use signal ground as the reference point for measurements and connections to external circuits. Analog Connections DAC Outputs – The eight DAC outputs from the LTC2656 are brought out to turrets labeled DAC A through DAC H. These may be connected to external instruments or other circuitry. DAC outputs are not in alphabetical order on the circuit board. VREF – The VREF turret is connected directly to the REFIN/ OUT pin of the LTC2656. When one of the onboard references is being used, the reference voltage may be monitored at this point. An external reference may also be applied to this turret after setting JP1 to EXT. dc13297bf 3 DEMO MANUAL DC1397B PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION 1 MANUFACTURER/PART NUMBER 0 C1 (Opt.) CAP., 0402 2 5 C2, C5, C7, C9, C10 CAP., X7R, 0.1µF, 16V, 10% 0402 TAIYO YUDEN, EMK105BJ104KV 3 2 C3, C6 CAP., X7R, 1.0µF, 10V, 10% 0603 TAIYO YUDEN, LMK107BJ105KA 4 1 C4 RES., CHIP, 0, 0402 VISHAY, CRCW04020000Z0ED 5 1 C8 CAP., C0G, 100pF, 25V, 5% 0402 AVX, 04023A101JAT2A 6 0 C11 (Opt.) CAP., 0603 7 14 E1-E14 TESTPOINT, TURRET, 0.061" PBF MILL-MAX, 2308-2-00-80-00-00-07-0 8 1 JP1 2X4, 0.079 DOUBLE ROW HEADER SAMTEC, TMM104-02-L-D 9 1 JP2 2X2, 0.079 DOUBLE ROW HEADER SAMTEC, TMM102-02-L-D 10 1 JP3 3 PIN 0.079 SINGLE ROW HEADER SAMTEC, TMM103-02-L-S 11 3 SHUNT SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G 12 1 J1 CONNECTOR, DUAL 2X7 0.079CC MOLEX, 87831-1420 13 4 R1, R2, R3, R4 RES., CHIP, 7.5k, 1/16W, 5% 0402 VISHAY, CRCW04027K50JNED 14 3 R5, R6, R7 RES., CHIP, 5.1k, 1/16W, 5% 0402 VISHAY, CRCW04025K10JNED 15 0 U2 (Opt.) I.C., LT1790 SOT23-6 16 1 U3 I.C., LT1790ACS6-1.25 SOT23-6 LINEAR., LT1790ACS6-1.25#PBF 17 1 U4 I.C., LT1790ACS6-5 SOT23-6 LINEAR., LT1790ACS6-5#PbF 18 1 U5 I.C., LTC2428CG SSOP-28G LINEAR., LTC2428CG#PBF 19 1 U6 I.C., Serial EEPROM TSSOP8 MICROCHIP, 24LC025-I/ST U1 I.C., LTC2656BCUFD-L16, UFD-20 LINEAR TECH U1 I.C., LTC2656BCUFD-H16, UFD-20 LINEAR TECH Assembly Type-A 20 1 Assembly Type-B 20 1 REVISION HISTORY REV DATE DESCRIPTION B 10/13 Add REFCOMP Capacitor PAGE NUMBER Throughout dc1397bf 4 E13 E12 GND GND NC EEGND EESCL EESDA EEVCC MISO MOSI/SDA SCK/SCL CS 5V VUNREG 14 12 11 9 10 5 7 4 6 2 1 DC1397B-B E11 C10 0.1uF R6 5.1K VCC LTC2656BCUFD-H16 V+ LTC2656BCUFD-L16 DC1397B-A V+ U1 ASSEMBLY TYPE 5 SDO SCK E10 VCC SDA 8 7 3 2 1 7 6 R5 5.1K SDI SDO SCK U6 24LC025-I/ST A2 A1 A0 WP SCL 9 * CS/LD U1 C12 0.1uF 10 DAC-SDO SDI CS LDAC Zero Scale Mid Scale JP2 2 R7 5.1K 2 4 5 REFCOMP VCC 1 3 VCC 17 VERSION TABLE LDAC J1 HDR2X7-079-MOLEX GND 13 GND 8 GND 3 VCC C8 100pF CUSTOMER NOTICE CH7 CH6 CH5 CH4 CH3 CH2 CH1 CH0 THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. 3 5 4 3 5 VOUT 2/21/08 2/21/08 DATE 6 C9 0.1uF E14 FSset VOUT 6 VCC JP1 F0 SDO DIN CLK SCK TECHNOLOGY 26 24 21 19 25 20 23 FILENAME: DWG NO 3 5 4 V+ E9 VREF R4 7.5K SHEET DC1397B 1 R3 OF 7.5K 1 REV 1 C7 0.1uF JP3 VCC Enable Disable 3 1 DNC DNC VIN C4 0 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 Fax: (408)434-0507 6 VOUT C6 1.0uF CS_MUX 1 3 5 7 U4 LT1790ACS6-5 INT 2 REF1 6 EXT 4 REF2 8 CS_ADC C3 1.0uF C11 1.0uF opt. LTC2656BCUFD 12/16-BIT, OCTAL DAC W/REFERENCE SIZE CAGE CODE TITLE 7.5K R2 DNC DNC VIN U3 LT1790ACS6-1.25 DNC DNC VIN U2 LT1790(opt.) Thursday, October 10, 2013 SCALE: APPROVED CONTRACT NO. U5 LTC2428CG 17 15 14 13 12 11 E7 E8 VE 10 E5 VH E6 VF VG 16 E4 15 E3 E2 VB VA 9 E1 VD VC 14 13 4 3 1 20 C5 0.1uF C2 0.1uF LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN A APPROVALS CIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS; HOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TO DRAWN J. Wu VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUAL ENGINEER APPLICATION. COMPONENT SUBSTITUTION AND PRINTED L. Chen CIRCUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUIT CHECKED PERFORMANCE OR RELIABILITY. CONTACT LINEAR TECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE. VOUTH VOUTG VOUTF VOUTE VOUTD VOUTC VOUTB VOUTA R1 7.5K C1 0.1uF opt. 4 7 MUXOUT 6 REFIN/OUT GND 21 CLR GND 1 GND 2 GND 1 GND 2 4 ADCIN 12 PROSEL REFLO 19 2 GND 2 11 VCC GND 18 3 GND 28 ZSset 5 FSset GND 27 8 VCC GND 18 VCC GND 22 GND 16 GND 6 GND 1 GND 1 * 8 VCC GND 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. 4 2 V+ DEMO MANUAL DC1397B SCHEMATIC DIAGRAM dc13297bf 5 DEMO MANUAL DC1397B 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 dc1397bf 6 Linear Technology Corporation LT 1013 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2012