DEMO MANUAL DC1546A LTC2754-16 Quad 16-Bit SoftSpan IOUT DAC Description Demonstration circuit 1546A features the LTC2754-16 dual 16-bit SoftSpan™ IOUT DAC. This device features six output ranges: 0V to 5V, 0V to 10V, ±5V, ±10V, ±2.5V, and –2.5V to 7.5V. The DAC has offset adjustment and gain-adjustment pins to allow optimization of transient response. 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 and QuikEval and SoftSpan are a trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Board Photo RIBBON CABLE DAC CONNECTIONS TO DC590 CONTROLLER dc1546a F01 ANALOG POWER SUPPLY (NORMALLY ±15V) Figure 1. DC1546A Connection Diagram DC1546Af 1 DEMO MANUAL DC1546A Quick Start Procedure 1. Connect a clean ±15V power supply to the AMPV+ and AMPV– turret posts at the bottom of the DC1546A board. 2. Connect J1 to a DC590 USB serial controller using the supplied 14-conductor ribbon cable. 3. Connect the DC590 to a host PC with a standard USB A/B cable. The software automatically sets the LTC2754-16 outputs according to the entries in the control panel. A square wave option is available to test settling time. The MSPAN jumper should be low if software span control is desired. Additional software documentation may be available from the Help menu item, as features may be added periodically. 4. Run the QuikEval™ evaluation software supplied with the DC590 or download it from www.linear.com/ software. The correct control panel will be loaded automatically. Figure 2. QuikEval Software Screenshot DC1546Af 2 DEMO MANUAL DC1546A Hardware Setup Jumpers ANALOG CONNECTIONS MSPAN: Manual Span Control Pin. MSPAN is used to configure the LTC2754-16 for operation in a single, fixed output range. If MSPAN is high it will be configured for single span use. If MSPAN is low it will be set through the QuikEval software. The default position is 0 (low). OUTA, OUTB, OUTC, OUTD: DAC Voltage Outputs. S0, S1, S2: Used to set the fixed output range if MSPAN is high. Default is all jumpers removed, allowing software span control. VOSA, VOSB, VOSC, VOSD: DAC Offset Adjust Input. Use only if the VOSA/VOSB/VOSC/VOSD jumper is set to EXT. Nominal input range is ±5V. S2 S1 S0 SPAN 0 0 0 Unipolar 0V to 5V 0 0 1 Unipolar 0V to 10V 0 1 0 Bipolar –5V to 5V 0 1 1 Bipolar –10V to 10V 1 0 0 Bipolar –2.5V to 2.5V 1 0 1 Bipolar –2.5V to 7.5V Codes not shown are reserved and should not be used. VREF: Voltage reference selection for the DAC, either 5V for the onboard LT1236 reference or EXT if an external reference source is connected to the VREF turret post. VOSA, VOSB, VOSC,VOSD: Offset adjustment selection for DACA, DACB, DACC, DACD. If no offset adjustment is required, select GND. Selecting EXT connects the offset pin to the turret allowing external adjustment of offset. REFADJA, REFADJB, REFADJC, REFADJD: Gainadjustment selection for each associated DAC. If no gainadjustment is required, select GND. Selecting EXT connects the gain pin to the turret allowing external adjustment of gain. VCC: Select source for 5V VCC supply. Set to 5V for supply by onboard LT1236 reference (recommended). Set to REG to be supplied by regulated supply from the DC590 controller and remove the jumper to supply externally. VREF: DAC Reference Voltage. If the onboard LT1236 references are selected, the voltage may be measured at these points. If a remote reference is selected, then an external reference must be applied to these points. REFADJA, REFADJB, REFADJC, REFADJD: Gain-adjust input for each associated DAC. This control input can be used to null gain error or to compensate for reference errors. Only used if the associated REFADJ jumper is set to EXT. DIGITAL CONNECTIONS (TURRET POSTS) CLR: Asynchronous Clear Pin. Pulled high through a 10k on the board but can be driven low to clear all DAC registers. RFLAG: Reset Flag Pin. Active low output. LDAC: Asynchronous DAC Load Input. Pulled high through a 10k on the board, but can be driven low to update all DAC registers GROUNDING AND POWER CONNECTIONS Analog Power: The 15V, –15V and GND turret posts are the analog supplies for the internal DAC amplifiers. These should be connected to a well regulated, low noise power supply. VCC: Connection to VCC. See the schematic and description for the VCC jumper. DC1546Af 3 DEMO MANUAL DC1546A Parts List ITEM QTY REFERENCE PART DESCRIPTION MANUFACTURER/PART NUMBER CAP., X7R, 150pF, 50V, 10%, 0603 AVX, 06035C151KAT2A DC1546A Required Circuit Components 1 4 C7, C14, C20, C21 2 4 C16, C17, C18, C19 CAP., COG, 27pF, 50V, 10%, 0603 AVX, 06035A270KAT2A 3 2 C15, C22 CAP., X7R, 0.1µF, 25V, 20%, 0603 TDK, C1608X7R1E104M 4 10 C1-C6, C8, C9-C13 CAP., X5R, 0.1µF, 50V, 20%, 0805 TDK, C2012X7R1H104M TDK, C3216X5R1C106M 5 4 C1, C8, C23, C24 CAP., X5R, 10µF, 16V, 20%, 1206 6 0 C7, C14, C16-C21 OPT. 7 3 D1, D2, D4 DIODE, SCHOTTKY, SOT23 DIODES INC., BAT54C-7-F 8 1 D3 LED, SMT GREEN PANASONIC, LN1351C-(TR) 9 27 E1-E27 TESTPOINT, TURRET, 0.064" MILL-MAX, 2308-2 10 0 TP1-TP6 OPT. 11 9 JP1-JP7, JP10, JP13 JMP, 3-PIN, 1 ROW, 0.079" SAMTEC, TMM-103-02-L-S 12 4 JP8, JP9, JP11, JP12 JMP, 2×3, 0.079" SAMTEC, TMM-103-02-L-D 13 17 JP1-JP7, JP10, JP13, SHUNT, 0.079" CENTER SAMTEC, 2SN-BK-G (JP8, JP9, JP11, JP12 = 2 EA.) 14 1 J1 HEADER, 2×7PIN, 0.079" MOLEX, 87831-1420 (PBF) 15 3 R4-R6 RES., CHIP, 4.99k, 1/16W, 1%, 0603 VISHAY, CRCW06034K99FKED 16 3 R1-R3 RES., CHIP ,10k, 1/16W, 5%, 0603 VISHAY, CRCW060310K0FKED 17 1 U1 I.C., LTC2754AIUKG-16, QFN52UKG LINEAR TECHNOLOGY, LTC2754AIUKG-16 18 4 U2-U5 I.C., LT1469CS8, SO8 LINEAR TECHNOLOGY, LT1469CS8 19 1 U7 I.C., LT1236ACS8-5, SO8 LINEAR TECHNOLOGY, LT1236ACS8-5 MICROCHIP, 24LC025-I /ST 20 1 U6 I.C., SERIAL EEPROM, TSSOP8 21 4 FOR 4 CORNERS STAND-OFF, NYLON (SNAP-ON), 0.625" TALL KEYSTONE, 8834 DC1546Af 4 D C B A 1 NC EEGND EESCL EESDA EEVCC MISO SDA/MOSI SCK/SCL CS 5V V+ E18 E16 E13 E10 E8 E6 E4 E3 E2 J1 HD2X7 REFADJD REFADJC REFADJB REFADJA LDAC RFLAG CLR AMP V- GND 14 12 11 9 10 5 7 4 6 2 1 V- 1 C22 0.1uF TP1 CS 2 R4 4.99K TP2 SCK REFADJD REFADJC REFADJB REFADJA D2 BAT54C 3 2 2 D1 BAT54C GND R5 4.99K TP3 SDI 3 TP5 WP C3 0.1uF 50V TP6 SDA SCL WP VSS A2 A1 A0 U6 24LC025 C10 0.1uF 50V VCC VSS 5 6 7 8 R6 4.99K TP4 SDO GND JP4 REFADJD 1 EXT. 2 JP3 REFADJC 1 EXT. 2 3 GND JP2 REFADJB 1 EXT. 2 3 GND 3 C9 0.1uF 50V C2 0.1uF 50V JP1 REFADJA 1 EXT. 2 C8 10uF 16V C1 10uF 16V 4 3 2 1 C12 0.1uF 50V 3 C23 10uF 16V R2 10K 2 33 34 35 32 36 VIN 8 7 6 5 31 30 6 S0 S1 S2 M-SPAN LDAC SRO SCK SDI CS RFLAG CLR C24 10uF 16V 6 4 2 C15 0.1uF VCC JP11 4 5 3 1 4 + 7 EXT. 5V 6 4 2 C14 150pF JP12 3 2 5 3 1 V- + - V+ Exposed Pad, Solder Side U1 LTC2754AIUKG-16 U2B LT1469CS8 5 6 EXT. 5V 1 E24 E26 REF3 REF4 1 2 3 JP13 EXT. 5V E27 E23 REF1 VCC E21 REF2 VCC U5A LT1469CS8 C20 150pF 3 2 V- + - V+ 5 5 + - VCC REF4 REF3 REF1 REF2 5 6 1 7 U4B LT1469CS8 150pF C21 VOSADJD IOUT2D IOUT1D VOSADJC IOUT2C IOUT1C VOSADJB IOUT2B IOUT1B VOSADJA IOUT2A IOUT1A U3A LT1469CS8 C7 150pF Figure 3. LTC2754-16 Schematic Diagram VOUT U7 LT1236ACS8-5 D4 BAT54C V+ REFADJD REFADJC REFADJB REFADJA S0 S1 S2 R3 10K VCC C13 0.1uF 50V C6 0.1uF 50V M-SPAN 1 C5 0.1uF 50V D3 LED GREEN R1 10K 2 C11 0.1uF 50V C4 0.1uF 50V 1 3 1 3 10 VDD 2 REFADJA 1 REFADJB 40 REFADJC 27 REFADJD 14 REF2 REF1 GND 4 GND 11 GND 9 GND 53 REF3 REF4 8 4 44 V+ 8 4 RINC 28 GND 37 39 RINB 2 RINA 52 RCOMA 41 RCOMB RCOMC 26 RIND 13 RCOMD 15 42 REFB 43 24 REFC 25 ROFSB ROFSC 49 RFBA 50 ROFSA 51 RFBB RFBC 23 REFA REFD 16 ROFSD 17 RFBD 18 AMP V+ GND GND GND 3 8 13 2 3 20 12 19 21 29 22 46 38 45 47 3 48 S0 S2 REF4 0 1 6 4 2 VCC 0 1 6 4 2 VCC REF3 REF2 JP8 VOSADJD VOSADJC VOSADJB VOSADJA REF1 6 S2 S1 6 JP9 S0 M-SPAN + - + - C16 27pF 7 M-SPAN S1 U4A LT1469CS8 U5B LT1469CS8 C18 27pF U3B LT1469CS8 7 3 2 3 2 V- + - V+ V- + - V+ 1 JP7 VOSADJC 1 2 3 JP10 VOSADJD 1 2 3 GND EXT. GND EXT. JP6 VOSADJB 1 2 3 GND EXT. Linear Technology Has Made A Best Effort To Design A Circuit That Meets Customer-Supplied Specifications; However, It Remains The Customer's Responsibility To Verify Proper And Reliable Operation In The Actual Application. Component Substitution And Printed Circuit Board Layout May Significantly Affect Circuit Performance Or Reliability. Contact Linear Technology Applications Engineering For Assistance. This Circuit Is Proprietary To Linear Technology And Supplied For Use With Linear Technology Parts. Customer Notice 7 E25 E22 E20 E19 VOSADJD VOSADJC VOSADJB VOSADJA GND OUTD GND OUTC GND OUTB GND OUTA Thursday, June 04, 2009 Date: Sheet 8 1 of 1 Rev. A 16-Bit Quad Serial Precision SoftSpan Iout DAC www.linear.com Demo Circuit 1546A Document Number Size LTC2754AIUKG-16, 1630 McCarthy Blvd. Milpitas, CA. 95035 Phone (408) 432-1900 Fax (408) 434-0507 VOSADJD VOSADJC VOSADJB VOSADJA E17 E15 E14 E12 E11 E9 E7 E5 NOTES: 8 Linear Technology Corporation Title C19 27pF JP5 VOSADJA 1 2 3 GND EXT. 1 C17 27pF 7 U2A LT1469CS8 LTC CONFIDENTIAL - FOR CUSTOMER USE ONLY 5 3 1 VCC 5 3 1 VCC 5 6 5 6 8 4 8 4 E1 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 1 D C B A DEMO MANUAL DC1546A Schematic Diagram DC1546Af 5 DEMO MANUAL DC1546A 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 DC1546Af 6 Linear Technology Corporation LT 0513 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com LINEAR TECHNOLOGY CORPORATION 2013