Evaluation Board for 12-/14-Bit, Serial Input, Dual Channel, Current Output DACs EVAL-AD5444/AD5446 The applied external reference input voltage (VREF) determines the full-scale output current. An integrated feedback resistor (RFB) provides temperature tracking and full-scale voltage output when combined with an external I-to-V precision amplifier. FEATURES Operates from dual 12 V and +5 V supplies On-board reference and output amplifiers Direct hookup to the printer port of a PC PC software for control of the DAC Complete information about the DAC can be found in the AD5444/AD5446 data sheet that is available from Analog Devices, Inc.; it should be consulted in conjunction with this data sheet when using the evaluation board. GENERAL DESCRIPTION This data sheet describes the evaluation board for the AD5444/AD5446 DACs. The AD5444/AD5446 are, respectively, CMOS 12-/14-bit current output, digital-to-analog converters (DACs). They operate from a +2.5 V to +5.5 V power supply, making them suited to battery-powered and other applications. PACKAGE CONTENTS The board consists of the AD5444/AD5446 and a current-tovoltage amplifier (AD8065). Included on the evaluation board is a 10 V reference (ADR01). Also, an external reference can be applied via an SMB input connector, and the SDO readback function can be enabled. The LDAC function is not available with the AD5444/AD5446. These DACs use data readback, allowing the user to read the contents of the DAC register via the DB pins. On power-up, the internal register and latches are filled with zeros and the DAC output is at zero scale. Included in the evaluation kit is a CD ROM with self-installing software to control the DAC. The software allows the user to exercise all functions of the AD5444/AD5446. Because the DACs are manufactured on a CMOS submicron process, they offer excellent four-quadrant multiplication characteristics. FUNCTIONAL BLOCK DIAGRAM VREF AD5444/AD5446 AD8065 I-TO-V 12-/14-BIT DAC SYNC SDIN VDDA SCLK VDD AGND VSS VOUT 05519-001 36-WAY CENTRONICS CONNECTOR ADR01 REFERENCE Figure 1. Rev. 0 Evaluation boards are only intended for device evaluation and not for production purposes. Evaluation boards are supplied "as is" and without warranties of any kind, express, implied, or statutory including, but not limited to, any implied warranty of merchantability or fitness for a particular purpose. No license is granted by implication or otherwise under any patents or other intellectual property by application or use of evaluation boards. Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties that may result from its use. Analog Devices reserves the right to change devices or specifications at any time without notice. Trademarks and registered trademarks are the property of their respective owners. Evaluation boards are not authorized to be used in life support devices or systems. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 www.analog.com Fax: 781.461.3113 (c)2008 Analog Devices, Inc. All rights reserved. EVAL-AD5444/AD5446 TABLE OF CONTENTS Features .............................................................................................. 1 Evaluation Board Software...........................................................3 General Description ......................................................................... 1 Evaluation Board Schematics and Artwork...................................4 Package Contents.............................................................................. 1 Ordering Information.......................................................................7 Functional Block Diagram .............................................................. 1 Bill of Materials..............................................................................7 Revision History ............................................................................... 2 Ordering Guide .............................................................................7 Evaluation Board Hardware and Software .................................... 3 ESD Caution...................................................................................7 Evaluation Board Hardware........................................................ 3 REVISION HISTORY 2/08--Revision 0: Initial Version Rev. 0 | Page 2 of 8 EVAL-AD5444/AD5446 EVALUATION BOARD HARDWARE AND SOFTWARE 3. EVALUATION BOARD HARDWARE The board requires 12 V and +5 V supplies. The +12 V VDD and the -12 V VSS power the output amplifier, whereas the +5 V VDD1 powers the DAC. All supplies are decoupled to ground with 10 F tantalum and 0.1 F ceramic capacitors. Deselect this option for the default setting (data is clocked on the falling edge). 4. Link LK1 can be used to connect the on-board reference to the VREF input, and Link LK2 can be used to enable the SDO readback function on-board. EVALUATION BOARD SOFTWARE To disable daisy chaining, select the Disable SDO check box. Deselect this option for the default setting (daisy chaining enabled). 5. To select the resolution of the part on the evaluation board, click the appropriate option button under Select Device. 6. Click OK to open the main window with drop-down menus (File, Printer Port, and Help), as shown in Figure 3. Software Installation The evaluation kit includes self-installing software on a CD ROM. The software is compatible with Windows(R) 95, Windows 97, Windows 2000, Windows NT, and Windows XP. To have the data clocked on the rising edge, select the Clock Data on Rising Edge check box. If the setup file does not run automatically when you insert the CD, run the setup.exe file directly from the CD. Software Operation 1. Ensure that the Centronics cable connects the PC to the evaluation board. 2. From the Analog Devices menu, click Start > All Programs > Analog Devices >AD5444_46 >AD5444_46 Evaluation Software. 05519-003 For older PCs, click Start > Programs > Analog Devices >AD5444_46 >AD5444_46 Evaluation Software. The AD5444/46 Evaluation Software dialog box opens, as shown in Figure 2. Figure 3. Main Window The main window allows you to write a data-word to the DAC. You must enter the 12- or 14-bit word in hexadecimal. The main window also allows you to select the control functions of the AD5444/AD5446, as follows: * * No Operation: The DAC is not being used. Load and Update: Loads the DAC register with the entered data-word and displays the output in the Readback Value field, also in the main window. 05519-002 The Printer Port menu allows you to select the printer port address to be used from a list of available addresses. Figure 2. AD5444/46 Evaluation Software Dialog Box Rev. 0 | Page 3 of 8 P1-19 P1-20 P1-21 P1-22 P1-23 P1-24 P1-25 P1-26 P1-27 P1-28 P1-29 P1-30 P1-13 P1-5 P1-4 P1-2 P1-3 SDO LDAC SYNC SDIN SCLK LK2 A B Figure 4. Evaluation Board Schematic Rev. 0 | Page 4 of 8 P2-4 P2-1 P2-2 P2-3 J6 J5 J4 C15 0.1F C13 0.1F C11 0.1F J3 + + + C16 10F C14 10F C12 10F SDO/LDAC SYNC SDIN SCLK VSS SDO SYNC SDIN SCLK VDD1 AGND VDD1 7 6 5 4 VREF GND IOUT2 IOUT1 RFB VDD U1 AD5444/AD5446 C3 10F VDD1 9 3 2 1 10 8 2 5 C4 0.1F VREF C1 0.1F TRIM 4 GND R1 VOUT C6 4.7pF U2 ADR01AR VIN J2 VREF C2 10F VDD1 6 C5 0.1F LK1 VDD U3 -VS 3 +VS 2 AD8065AR VSS 7 4 10F + 0.1F 10F + C10 0.1F C9 6 C8 C7 TP1 J1 VOUT EVAL-AD5444/AD5446 EVALUATION BOARD SCHEMATICS AND ARTWORK 05519-004 05519-005 EVAL-AD5444/AD5446 05519-006 Figure 5. Component-Side Artwork Figure 6. Silkscreen--Component-Side View (Top) Rev. 0 | Page 5 of 8 05519-007 EVAL-AD5444/AD5446 Figure 7. Solder-Side Artwork Rev. 0 | Page 6 of 8 EVAL-AD5444/AD5446 ORDERING INFORMATION BILL OF MATERIALS Table 1. Qty. 8 1 6 1 6 1 1 1 1 1 6 1 1 11 1 Reference Designator C1, C4, C5, C8, C10, C11, C13, C15 C2 C3, C7, C9, C12, C14, C16 C6 J1 to J6 LK1 LK2 Part Description 0.1 F, 10%, X7R ceramic capacitor PCB Decal 0603 Supplier/Part Number 1 FEC 499-675 SMD Yes Layer Name Top 10 F, 10 V, 10% Tantalum capacitor, Taj series 10 F, 20 V, 10% Tantalum capacitor, Taj series 4.7 pF, 10% NPO ceramic capacitor SMB socket 2-pin header (2 x 1) 3-pin header (3 x 1) CAP\TAJ_A FEC 197-130 Yes Top CAP\TAJ_B FEC 197-427 Yes Top FEC 721-920 FEC 310-682 FEC 511-705 and FEC 140-411 FEC 511-717 and FEC 140-411 Yes No No No Top Top Top Top FEC 147-753 FEC151-791 FEC 772-227 FEC 240-345 (Pack) No No Yes No Top Top Top Top Analog Devices AD5444YRM/AD5446YRM Analog Devices ADR01AR Analog Devices AD8065AR FEC 148-922 Yes Top Yes Yes Top Top P1 P2 R1 SCLK, SDIN, SYNC, TP1, SDO, VREF U1 36-pin Centronics connector 4-pin terminal block 0 , 0.063 W resistor Red testpoint 0603 SMB SIP-2P LINK-3PNOTEXTSIP-2P 36WAY CON\POWER6 0603 TESTPOINT AD5444/AD5446 MSO10 U2 U3 N/A ADR01 AD8065 Rubber stick-on feet, each corner SO8NB SO8NB FEC indicates the Farnell Electronic Components company. ORDERING GUIDE Model EVAL-AD5444EBZ1 EVAL-AD5446EBZ1 ESD CAUTION Description AD5444 Evaluation Board AD5446 Evaluation Board 1 Z = RoHS Compliant Part. Rev. 0 | Page 7 of 8 EVAL-AD5444/AD5446 NOTES (c)2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB05519-0-2/08(0) Rev. 0 | Page 8 of 8