DEMO MANUAL DC752A LTC2704 Quad 16-Bit V Softspan DAC OUT Description Demonstration circuit DC752A-B features the LTC2704-16 pensation pin to allow optimization of transient response. Quad 16-bit SoftSpan™ V DAC. This device features OUT Design files for this circuit board are available at six output ranges, 0V to 5V, 0V to 10V, ±5V, ±10V, ±2.5V http://www.linear.com/demo and –2.5V to 7.5V that are independently settable for each L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks and channel. Each DAC has an offset adjust input pin and a com- SoftSpan and QuikEval are trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Figure 1. Connection Diagram dc752af 1

DEMO MANUAL DC752A Quick start proceDure Connect a clean ±15V power supply to the turret posts at software automatically sets the LTC2704 outputs according the top of the DC752A board. Connect J1 to a DC590 USB to the entries in the control panel. A square wave option serial controller using the supplied 14-conductor ribbon is available to test settling time. cable. Connect DC590 to a host PC with a standard USB Additional software documentation may be available from A/B cable. Run the QuikEval™ evaluation software supplied the Help menu item, as features may be added periodically. with DC590 or download it from www.linear.com/software. The correct control panel will be loaded automatically. The Figure 2. Software Screenshot dc752af 2

DEMO MANUAL DC752A HarDware setup JumperS AnAlOg COnneCtiOnS (turret pOStS) Jp8, Jp9: Tie points for GND1 and GND2, respectively. OutFA, OutFB, OutFC, OutFD: DAC voltage outputs. The default selection is TIE for both jumpers. This con- OutSA, OutSB, OutSC, OutSD: DAC feedback inputs. nects all DAC grounds to the analog ground plane, and is The LTC2704 RFB inputs have a nominal 10k resistance, suitable for most applications that do not have large return so resistance between this point an the load or buffer currents into the GND1 and GND2 turrets. Alternatively, output must be kept low. selecting REMOTE allows GND1 and GND2 to differ by as much as ±300mV from analog ground. reF1, reF2: DAC Reference voltage. If the onboard LT1236 references are selected, the voltage may be measured at Jp1, Jp2, Jp4, Jp6: Sense connections for DACA, DACB, these points. If a remote reference is selected, then an DACC, and DACD, respectively. Selecting TIE connects external reference must be applied to these points. OUTFx (output force) output directly to OUTSx (output sense). Selecting REMOTE allows for remote sensing of reFm1, reFm2: Inverted reference output from the the output voltage. This also allows a power gain stage LTC2704. Do not drive these points with an external source. such as the LT1970 to be added with no degradation of accuracy. pOwer AnD grOunD COnneCtiOnS Jp3 (reF1): Voltage reference selection for DACA and Analog power: The +15V, –15V, and GND turret posts DACB, either 5V for the onboard LT1236 reference or are the analog supplies for the internal DAC amplifiers. REMOTE if an external reference source is connected to These should be connected to a well regulated, low noise the REF1 turret post. power supply. Jp5 (reF2): Voltage reference selection for DACC and V : Connection to V . See schematic and description CC CC DACD, either 5V for the onboard LT1236 reference or for JP7. REMOTE if an external reference source is connected to grounding: Separate power and signal grounds are pro- the REF2 turret post. vided. Signal ground is connected to the exposed ground Jp10 (VOSA), Jp12 (VOSB), Jp11 (VOSC), Jp13 (VOSD): planes at the top and bottom edges of the board, and to offset adjustment selection for DACA, DACB, DACC, and the two turrets labeled AGND. Use signal ground as the DACD, respectively. If no offset adjustment is required, reference point for measurements and connections to select GND. Selecting ADJ connects the offset pin to the external circuits. Any large currents drawn from the DAC associated 10-turn pot, allowing adjustment of the DAC’s outputs should be returned to the power ground turret offset. closest to pin 1 on the 14-pin header. In this situation, GND1 and GND2 can be used to sense the ground voltage Jp7: Select source for 5V V supply. Normally this should CC at the load, compensating for return resistance between the be left in the REF position for lowest noise operation. The load and power ground return. The maximum difference REG position selects the 5V regulated supply from the in voltage between the load and power ground should be 14-pin QuikEval connector. To apply an external supply, less than 300mV. remove JP7 completely. dc752af 3

DEMO MANUAL DC752A parts List item QtY reFerenCe pArt DeSCriptiOn mAnuFACturer/pArt numBer required Circuit Components 1 4 C1, C2, C3, C4 Cap., NPO 27pF 25V 5% AVX 06033A270JAT1A 2 5 C5, C6, C8, C10, C13 Cap., X7R 0.1µF 16V 20% AVX 0603YC104MAT2A 3 3 C7, C11, C12 Cap., X5R 4.7µF 6.3V 20% TDK C1608X5R0J475MT 4 2 C9, C14 Cap., X5R 4.7µF 25V 20% Taiyo Yuden TMK316BJ475ML 5 4 C15, C16, C17, C18 Cap., X7R 0.1µF 25V 10% Taiyo Yuden TMK107BJ104KA 6 4 D1, D3, D4, D5 Diode, Dual Switching Diode ON Semi. BAV99LT1 7 1 D2 LED, GRN Panasonic LN1351-C-TR 8 6 D6, D7, D8, D9, D10, D11 Schottky (Dual) Diode, BAT54S Zetex BAT54S 9 13 JP1-JP13 Headers, 3 Pins 2mm Ctrs. CommConn Con Inc. 2802S-03G2 10 13 XJP1-XJP13 Shunt, 2 Pins 2mm Ctrs. CommConn Con Inc. CCIJ2MM-138GW 11 1 J1 Headers, 14 Pin 2mm Ctrs. Molex 87331-1420 12 2 R2, R1 Res., Chip 10k 0.1W 5% AAC CR16-103JM 13 1 R3 Res., Chip 1k 0.06W 5% AAC CR16-102JM 14 3 R4, R5, R6 Res., Chip 4.99k 0.1W 1% AAC CR16-4991FM 15 4 R9, R10, R13, R14 Pot. 11 Turns 20k Bourns 3224W-1-203E 16 0 TP1, TP4, TP6, TP19, TP20 (Opt) Testpoint 17 20 TP2, TP3, TP5, TP7-TP18, TP21-TP25 Turret, Testpoint Mill Max 2308-2 18 1 U2 I.C., µPWR LDO Linear Technology Corp. LT1790ACS6-5 19 1 U3 EEPROM, Serial MICROCHIP, 24LC025-I /ST 20 2 U4, U5 I.C., Precision Ref. Linear Technology Corp. LT1236ACS8-5 21 1 U6 I.C., SoftSpan DAC Linear Technology Corp. LTC2704CGW-16 dc752af 4

DEMO MANUAL DC752A scHematic Diagram D C B A 21 JP1OUTA1TIE2Table3REMOTEVOSA4D1VOSAC1BAV99LT15C1AJP2(Opt)TP2OUTB7OUTSAOUTSA1TIETP36OUTFAOUTFA23AGNDA3REMOTEGND1D3BAV99LT1VOSB40VOSBC239C1B(Opt)TP537OUTSBOUTSBTP738OUTFBOUTFB41AGNDBGND1 VOSC27VOSCC328C1C(Opt)TP830OUTSCOUTSCTP1029OUTFCOUTFC26AGNDCD4GND2BAV99LT1JP4VOSD19OUTCVOSDC41TIE18C1D2(Opt)TP1116OUTSDOUTSD3REMOTETP1217OUTFDOUTFD20AGNDDD5GND2BAV99LT1JP6MMMMMMVVVVVVOUTD1TIE521618123323REMOTE-15VC18C171uF1uF25V25V TP15VOSC1AGNDGNDVOSC2GND2TP163AGNDADJJP11CCWCWR1020KVOSD1GNDVOSD2GND23ADJJP13REF2CCWCWR1420K REFM2 TP17TP18GND1GND2 JP9JP8GND2GND111TIETIE223333REMOTEREMOTE2121D7D8GND1GND2BAT54SBAT54S C:\ORCADWIN\CAPTURE\752A\752A_00_REV4.DSN1630 McCarthy Blvd.CONTRACT NO.CUSTOMER NOTICEMilpitas, CA 95035Phone: (408)432-1900LINEAR TECHNOLOGY HAS MADE A BEST EFFORT TO DESIGN AAPPROVALSFax: (408)434-0507TECHNOLOGYCIRCUIT THAT MEETS CUSTOMER-SUPPLIED SPECIFICATIONS;RUDY BDRAWN:LTC Confidential-For Customer Use OnlyHOWEVER, IT REMAINS THE CUSTOMER'S RESPONSIBILITY TOCHECKED:SCHEMATICTITLE:VERIFY PROPER AND RELIABLE OPERATION IN THE ACTUALQuad 16-Bit Voltage Output,APPLICATION. COMPONENT SUBSTITUTION AND PRINTEDAPPROVED:Softspan DACCIRUIT BOARD LAYOUT MAY SIGNIFICANTLY AFFECT CIRCUITMARK T.ENGINEER:PERFORMANCE OR RELIABILITY. CONTACT LINEARSIZEDWG NO.REVDESIGNER:DEMO CIRCUIT 752ATECHNOLOGY APPLICATIONS ENGINEERING FOR ASSISTANCE.4NONETHIS CIRCUIT IS PROPRIETARY TO LINEAR TECHNOLOGY ANDWednesday, August 09, 200611DATE:SHEETOFSUPPLIED FOR USE WITH LINEAR TECHNOLOGY PARTS.21 43 VCCTP1U6R1LDACDC752A-A"Future Use"VCCSee 10K DC752A-BLTC2704CGW-169LDACVCCD2CS/LDFLT10CS/LDGRNSDI11SDIR2SRO1210KSROSCKTP413R3SCK1KCLR14CLRTP6FLT35FLTTP9REF1JP3REF121REMOTEGND1REFG1REF1432REF1REFM1443TP245VREF15VREFM1TP13REFM1REF2JP5REF2211REMOTEREFG2GND2REF2242REF2REFM2233TP255VREF25VREFM2D6TP14REFM2BAT54SVCC3JP7LT1790VCC121REFVCC234VCC333C5REG+5VGND0.1uF32D9AGNDBAT54SU23LT1790ACS6-5VS 2164VOUTVIN21PPVVC735C6DNCDNC4.7uF0.1uF5224GNDGNDD10BAT54S12+15V3C16C151uF1uF2125V25V VOSA1GNDVOSA2GND13ADJJP10CCWCWR920KVOSB1GNDVOSB2GND1+5V+7V3ADJJ1JP12REF1CCWCW12R1320KSCK34CS/LDREFM156789101112R5C8R6R4U313140.1uF4.99K4.99K4.99K181%1%1%A0VCC27A1WP36A2SCL45VSSSDAWP24LC025TP19VSSTP20 +15VU4U55VREF15VREF2VSVSLT1236ACS8-5LT1236ACS8-5 6262C9VINVINVOUTVOUT4.7uFD115525VBAT54STRIMTRIMC11C10GNDGND214.7uF0.1uFC12C134.7uF440.1uF3C144.7uF25VGND1GND2 -15V 43 5  +15V +7V SROSDI 5 TP21+15V TP22PGND TP23-15V D C B A dc752af 5 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 representa- tion that the interconnection of its circuits as described herein will not infringe on existing patent rights.

DEMO MANUAL DC752A 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 applica- tion engineer. Mailing Address: Linear Technology 1630 McCarthy Blvd. Milpitas, CA 95035 Copyright © 2004, Linear Technology Corporation dc752af 6 Linear Technology Corporation LT 0613 • PRINTED IN USA 1630 McCarthy Blvd., Milpitas, CA 95035-7417 (408) 432-1900 ● FAX: (408) 434-0507 ● www.linear.com  LINEAR TECHNOLOGY CORPORATION 2013