DEMO MANUAL DC1096B LTC2642A-16 16-Bit Unbuffered VOUT DAC DESCRIPTION Demonstration circuit 1096B features the LTC®2642A-16, a 16-bit voltage output DAC. The LTC2642A-16 output is unbuffered, allowing it to swing all the way to the supply rails. DC1096B is a member of Linear Technology’s QuikEval™ family of demonstration boards. It is designed to allow easy evaluation of the LTC2642A-16 and may be connected directly to the target application’s analog signals while using the DC590 USB serial controller board and supplied software to measure performance. The exposed ground planes allow proper grounding to prototype circuitry. After evaluating with Linear Technology’s software, the digital signals can be connected to the end application’s processor/controller for development of the serial interface. Design files for this circuit board are available at http://www.linear.com/demo/DC1096 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. DAC1 OUTPUT– LTC6078 BUFFER DAC2 OUTPUT– LT1678 AMP DAC3 OUTPUT– OPTIONAL AMP DAC3 UNBUFFERED OUTPUT REFERENCE VOLTAGE AMPLIFIER SUPPLY +– +– DC1096b F01 Figure 1. Connection Diagram dc1096bfa 1 DEMO MANUAL DC1096B QUICK START PROCEDURE Connect DC1096B to a DC590 USB serial controller using the supplied 14-conductor ribbon cable. Connect DC590 to host PC with a standard USB A/B cable. Run the evaluation software supplied with DC590 or downloaded from www.linear.com/software. The correct program will be loaded automatically. By default, the control program will load a DC value into the LTC2642A-16. The value may be changed by typing hexadecimal counts (0000 - FFFF), or decimal counts (0 – 65535), or the voltage desired depending on the option selected. Setting the software to unipolar or bipolar will not set the hardware to bipolar mode. The jumpers need to be placed in their proper positions in order to accomplish this. The other option is a square wave output. The frequency of the square wave is not tightly controlled; it is intended to allow measurement of settling time and glitch impulse. Features may be periodically added to the software, see the software’s help menu for the latest information. dc1096bfa 2 DEMO MANUAL DC1096B HARDWARE SETUP POWER CONNECTIONS CONNECTION TO DC590 SERIAL CONTROLLER A low noise, bipolar power supply can be connected to the AMPV+, AMPV–, and GND turret posts. J1 is the power and digital interface connector. Connect to DC590 serial controller with supplied 14-conductor ribbon cable. If an external supply is connected, the respective jumpers must be placed in the EXT position. This provides power to the LT1678 amplifier and optional amplifiers U5, U8, or U9. The LT1678 will work with supplies as high as ±15V, consult the data sheet for supply limitations on any optional amplifiers that are installed. JUMPERS JP1: Select the source for REF+, either 2.5V or 5V from the onboard LT1019 or LT1236 reference (default – 5V) JP2: Select the VCC source, either provided by a connected DC590 or an external source. JP3: Sets DAC2 to either unipolar or bipolar mode. In bipolar mode, set JP6 and JP7 to EXT and apply an appropriate supply to AMP V+, AMP V–, and GND turret posts. JP4: Sets DAC3 to either unipolar or bipolar mode. In bipolar mode, set JP6 and JP7 to EXT and apply an appropriate supply to AMP V+, AMP V–, and GND turret posts. OUTPUT CONNECTIONS E3 is the output from U1, which is buffered by an LTC6078 op amp. E4 is the output from U2, which is buffered by an LT1678 op amp. JP3 allows this DAC to be configured for either unipolar or bipolar operation. E5 is the buffered output of U4, if an optional amplifier is installed. There are three standard op amp footprints that allow other amplifiers to be evaluated. E10 is directly connected to U4’s output. REFERENCE CONNECTIONS JP1 selects between the onboard 5V reference and the onboard 2.5V reference. The reference voltage can be monitored on E9, or an external reference may be applied to E9 if JP1 is removed. JP6: Sets V+ for the amplifiers to either external (AMP V+) or VCC. JP7: Sets V– for the amplifiers to either external (AMP V–) or ground. dc1096bfa 3 DEMO MANUAL DC1096B PARTS LIST ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER 1 12 C1, C3, C6, C13-C21 CAP, 0603 0.1µF 10% 25V X7R AVX 06033C104KAT 2 2 C4, C5 CAP, 0805 10µF 20% 10V X5R TDK C2012X5R1A106M125AB 3 1 C8 CAP, 0402 0.1µF 20% 16V X7R TDK C1005X7R1C104M050BC 4 2 C10, C9 CAP, 0603 4.7µF 20% 6.3V X5R TDK C1608X5R0J475M080AB 5 1 C11 CAP, 0402 33pF 10% 50V NP0 AVX, 04025A330KAT2A 6 0 C12 CAP, 0402 OPTION TDK C1005X7R1E103K050BB 7 13 E1-E10, E12-E14 TURRET MILL-MAX 2308-2-00-80-00-00-07-0 8 6 JP1-JP4, JP6, JP7 HEADER, 3PIN 2mm SULLINS, NRPN031PAEN-RC 9 1 JP5 HEADER, 2X4 0.100 CENTERS WÜRTH ELEKTRONIK, 61300821121 10 1 J1 HEADER, 2X7 2mm MOLEX 87831-1420 11 1 R1 RES, 0402 10k 5% 1/16W VISHAY CRCW040210K0JNED 12 2 R3, R2 RES, 0402 0Ω JUMPER VISHAY CRCW04020000Z0ED 13 3 R4, R5, R6 RES, 0402 4.99k 1% 1/16W VISHAY CRCW04024K99FKED 14 3 R7, R8, R9 RES, 0603 0Ω JUMPER VISHAY CRCW0603000Z0EA 15 3 U1, U2, U4 IC, LTC2642ACDD-16 LINEAR TECH. LTC2642ACDD-16 16 1 U3 IC, 24LC025-I/ST MICROCHIP TECH. 24LC025-I/ST 17 0 U5, U8, U9 IC, OPTION OPTION 18 1 U6 IC, LTC6078ACMS8 LINEAR TECH LTC6078ACMS8 19 1 U7 IC, LT1678CS8#PBF LINEAR TECH LT1678CS8#PBF 20 1 U10 IC, VOLTAGE REG 5V LINEAR TECH. LT1236CCS8-5#PBF 21 1 U11 IC, VOLTAGE REG 2.5V LINEAR TECH. LT1019CS8-2.5#PBF 22 6 JP1-JP4, JP6, JP7 SHUNT SAMTEC 2SN-BK-G 23 1 JP5 SHUNT, 0.100 WÜRTH ELEKTRONIK, 60900213421 dc1096bfa 4 A B C J1 GND 5 + 6 - AMP V- SCK/SCL CS 5V VUNREG 10uF C4 V+ E14 E13 E12 V- 14 12 9 10 11 5 7 4 6 2 1 7 5 2 JP7 2 JP6 VDD U5B OPT S8 GND EXT EXT VCC NC EEGND EESDA EEVCC EESCL MISO MOSI/SDA E8 AMP V+ GND E7 GND TRIM OUT 5 6 OUT U3 5 5 6 0.1uF C19 7 V- C16 0.1uF 1 2 3 7 6 V+ 0.1uF C20 V+ A0 A1 A2 WP SCL 4.7uF C10 2.5V 5V 4.7uF VREF C9 C15 0.1uF U6B LTC6078ACMS8 VDD 0.1uF C14 0.1uF C18 C13 0.1uF 0.1uF 5 + 6 - SDA 24LC025-I/ST 1% R6 4.99K TRIM C17 IN U11 LT1019CS8-2.5 IN 0.1uF C8 2 2 U10 LT1236CCS8-5 GND 4 GND 3 5 + 6 - V- 1% R4 4.99K 7 4 E9 1% 8 7 V+ 6 5 SPI BUS 4 2 3 JP5 VREF 1 R5 4.99K 2 VREF JP1 4 U7B LT1678CS8 1 5 + 6 - V- 7 U8B OPT S08 0.1uF NCLR LD SDI SCK 5 2 4 3 0.1uF NCLR LD SDI SCK C3 NCLR LD SDI SCK 0.1uF 3 VDD VDD 7 6 7 6 OPT C12 7 6 VREF 0 3 2 JP3 2 2 2 SCALE = NONE MARK T. KIM T. APPROVALS R3 UNI BIP JP4 VREF R2 0 UNI BIP VREF THIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY AND SUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS. CUSTOMER NOTICE INV VOUT R9 0 INV VOUT R8 0 INV C11 33pF 50V R7 0 VOUT JP2 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. U4 LTC2642ACDD-16 5 2 4 3 C6 VCC INT EXT 10uF U1 LTC2642ACDD-16 5 2 4 3 C1 C5 1 U2 LTC2642ACDD-16 R1 10K VDD 3 2 9 V+ GND 13 GND 3 8 VCC 1 REF VDD GND REF 3 + 2 - 1 REV V+ 3 + 2 - V+ V- 3 + 2 - VV+ 3 + 4 - VV+ 3 + 2 - DATE: N/A SIZE GND DAC3 BUF DAC3 DIRECT DAC2 DAC1 GND VDD DATE 01-09-15 LTC2642ACDD-16 1 DEMO CIRCUIT 1096B SHEET 1 OF 1 1 REV. 1630 McCarthy Blvd. Milpitas, CA 95035 Phone: (408)432-1900 www.linear.com Fax: (408)434-0507 LTC Confidential-For Customer Use Only E6 E5 E10 E4 E3 E2 E1 MARK T. APPROVED 16-BIT VOUT DAC TECHNOLOGY Friday, January 09, 2015 IC NO. TITLE: SCHEMATIC 1 U5A OPT S8 1 U9 OPT SOT23-5 1 U8A OPT S08 U7A LT1678CS8 1 V- 1 DESCRIPTION 1 REVISION HISTORY REBUILD WITH CHANGE U6A LTC6078ACMS8 C21 0.1uF __ ECO 8 4 D 1 3 3 1 8 8 4 11 GND 4 11 11 9 9 8 RFB 10 1 VDD GND 10 RFB 8 1 REF VDD GND 8 RFB 10 3 1 3 1 8 4 8 4 5 2 8 4 8 4 8 4 8 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. 4 5 A B C D DEMO MANUAL DC1096B SCHEMATIC DIAGRAM dc1096bfa 5 DEMO MANUAL DC1096B 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 dc1096bfa 6 Linear Technology Corporation LT 0215 REV A • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2012