Evaluation Board for Dual, 16-Bit, I2C(R) Interface, Voltage-Output DAC EVAL-AD5667R for the use of an external reference (the AD780 on this evaluation board). The part must be written to after power-up to turn on the internal reference. FEATURES Full-featured evaluation board for the AD5667R and the AD5667 part On-board reference On-board ADC for voltage readback Various link options Direct hookup to the USB port of a PC PC software for control of DACs Complete specifications for the AD5667R can be found in the data sheet available from Analog Devices, Inc., and should be consulted in conjunction with this data sheet when using the evaluation board. This board can also be used to evaluate the AD5667 part. Full data on the AD5667 can be found in the data sheet available from Analog Devices. GENERAL DESCRIPTION This data sheet describes the evaluation board for the AD5667R dual 16-bit DAC. The AD5667R operates from a single 2.7 V to 5.5 V supply. The part incorporates an internal 1.25 V or 2.5 V on-chip reference to give an output voltage span of 2.5 V or 5 V, respectively. The on-chip reference is off at power-up allowing The evaluation board interfaces to the USB port of an IBM(R)compatible PC. Software is available with the evaluation board, allowing the user to easily program the AD5667R. FUNCTIONAL BLOCK DIAGRAM POWER SUPPLY INPUTS EXT REF IN/ INT REF OUT 3V VOLTAGE REFERENCE USB CONNECTOR SMB CONNECTORS VREF VOUTA VOUTB CONTROLLER CY7C68013 ADG738 8:1 MUX I/O ADC 07299-001 AD5667R 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. www.analog.com Tel: 781.329.4700 Fax: 781.461.3113 (c)2008 Analog Devices, Inc. All rights reserved. EVAL-AD5667R TABLE OF CONTENTS Features .............................................................................................. 1 Installing the Software ..................................................................5 General Description ......................................................................... 1 Software Operation .......................................................................5 Functional Block Diagram .............................................................. 1 Evaluation Board Schematics and Artwork ...................................7 Revision History ............................................................................... 2 Ordering Information .................................................................... 11 Evaluation Board Hardware ............................................................ 3 Component Listing .................................................................... 11 Power Supplies .............................................................................. 3 Ordering Guide .......................................................................... 11 Link Options ................................................................................. 3 ESD Caution................................................................................ 11 Evaluation Board Software .............................................................. 5 REVISION HISTORY 2/08--Revision 0: Initial Version Rev. 0 | Page 2 of 12 EVAL-AD5667R EVALUATION BOARD HARDWARE POWER SUPPLIES LINK OPTIONS To power the EVAL-AD5667R, apply 2.7 V to 5.5 V between the AVDD and AGND inputs for the analog supply of the AD5667R (J6). Alternatively, placing Link 6 in Position B powers the analog circuitry from the USB port (default setting). This powers all devices with a 3.3 V supply. A number of link and switch options on the evaluation board should be set for the required operating setup before using the board. The functions of these link options are described in detail in Table 2. The default setup is for control by the PC via the USB port and for evaluating the part in standard/fast mode with an external 3 V reference, the AD780. The default link options are listed in Table 1. Both AGND and DGND inputs are provided on the board. The AGND and DGND planes are connected at one location close to the AD5667R. To avoid ground loop problems, it is recommended not to connect AGND and DGND elsewhere in the system. Table 1. Link Options Setup for PC Control (Default) Each supply is decoupled to the relevant ground plane with 10 F and 0.1 F capacitors. Each device supply pin is also decoupled with a 10 F and 0.1 F capacitor pair to the relevant ground plane. Link No. LK1, LK2 LK3 LK4 LK5 LK6 LK7 LK8 LK9 LK10 LK11 LK12 LK13 LK16 Option Inserted A B B B A A Not applicable Removed B Not applicable A Inserted Table 2. Link Functions Link No. LK1, LK2 LK3 LK4 LK5 LK6 LK7 LK8 LK9 LK10 Function These links connect the VOUTA and VOUTB pins of the AD5667R to the input pins of the ADG728 demultiplexer to monitor the DAC output value using the on-board AD7992 ADC. This link allows the user to hardwire the ADDR pin to set the two LSBs (A1, A0) of the 7-bit address: 00011A1A0. Position A connects the ADDR pin to AVDD; therefore, two LSBs are 00. Position B connects the ADDR pin to GND; therefore, two LSBs are 11. When there is no connection, the 2 LSBs are 10. This link selects the AVDD power supply source for the AD780 reference. Position A selects J6 as the AD780 power supply source. Position B selects the 5 V USB supply voltage as the AD780 power supply source. This link selects the AVDD power supply source for the analog circuitry. Position A selects J6 as the AVDD analog circuitry power supply source. Position B selects the 3.3 V power supply source as the AVDD analog circuitry power supply source (see LK6). This link selects the 3.3 V power supply source for the digital circuitry. Position A selects J7 as the digital circuitry power supply source. Position B selects the USB port as the 3.3 V digital circuitry power supply source. This link selects whether the AD5667R evaluation board is controlled by the PC via the USB port or by an external source via SMB connectors (J1 to J4). Position A selects control by the PC via the USB port. Position B selects control by an external source via SMB connectors (J1 to J4). This link sets the RESET pin on the ADG728. Position A allows normal operation of the switch. Position B resets the switch. Not applicable. This link connects a 0.1 F capacitor to AGND on the VREFOUT pin. It is recommended to connect this when using the internal reference. Rev. 0 | Page 3 of 12 EVAL-AD5667R Link No. LK11 LK12 LK13 LK16 Function This link selects the reference source. Position A selects the internal reference as the reference source. The part must be written to via software to turn on the internal reference. Position B selects the on-board AD780 3 V reference as the reference source. Not applicable. This link selects the DAC voltage source. Position A selects the AVDD analog circuitry power supply source. Position B selects the on-board AD780 3 V reference as the power supply source. This link connects the O/PSELECT pin of the AD780 reference to ground, selecting a 3 V output. Leaving no connect gives a 2.5 V output. Rev. 0 | Page 4 of 12 EVAL-AD5667R 07299-002 EVALUATION BOARD SOFTWARE Figure 2. AD5667R Evaluation Software Main Window The main window of AD5667R evaluation software opens, as shown in Figure 2. The data programmed into the 24-bit input shift register is displayed. INSTALLING THE SOFTWARE The AD5667R evaluation kit includes self-installing software on CD. The software is compatible with Microsoft(R) Windows(R) 2000 and Windows XP. 2. The software should be installed before connecting the evaluation board to the USB port of the PC. This ensures that the board is correctly recognized when connected to the PC. Command Bits 1. 1. To select a command to program the part, click the appropriate option button under the Command Bits section. For example, to program all DAC outputs with full scale, click Write to and Update DAC channel n. After installation from the CD is complete, power up the AD5667R evaluation board as described in the Power Supplies section. Connect the board to the USB port of the PC using the cable supplied. 2. Select Both DACs in the Address Bits section. 3. In the Data Bits section, enter data in the Hex Value or Voltage box. Once the software detects the evaluation board, proceed through any additional dialog boxes to finalize the installation. 4. To execute, click Write to Part. You must click Write to Part to execute all writes to the part. 5. Other commands that the AD5667R evaluation software lets you program include powering down DAC bits, resetting bits, and setting up the LDAC register bits. This is done by clicking on the corresponding option button under the Command Bits section and then clicking Write to Part. You can also set the register bits for the required mode of operation. Consult the AD5667R data sheet for details. Start the Windows operating system and insert the CD. The installation software should launch automatically. If it does not, run the setup.exe file directly from the CD. 2. SOFTWARE OPERATION 1. From the Analog Devices menu, click Start > All Programs > Analog Devices > AD5667R > AD5667R Evaluation Software. For older PCs, click Start > Programs > Analog Devices > AD5667R > AD5667R Evaluation Software. Rev. 0 | Page 5 of 12 To select the command bits, the address bits, and the data bits, click the appropriate option button under each section. EVAL-AD5667R Reference Setup The voltage output on each DAC channel is monitored using the on-board ADC. To read the output voltage, click the Sample button in the ADC section (see Figure 2). 1. The AD5667R internal reference is turned off at power-up by default, allowing the use of an external reference. To turn on (or turn off) the internal reference, click Internal Reference Setup in the Command Bits section. 2. Click Write to Part. This allows you to program the bit in the reference setup register for the required mode of operation, as shown in Figure 3. 07299-003 ADC Figure 3. AD5667R Evaluation Software Main Window, Reference Setup Rev. 0 | Page 6 of 12 EVAL-AD5667R EVALUATION BOARD SCHEMATICS AND ARTWORK 07299-004 Figure 4. Schematic of Controller Circuitry Rev. 0 | Page 7 of 12 EVAL-AD5667R 07299-005 Figure 5. Schematic of AD5667R Circuitry Rev. 0 | Page 8 of 12 07299-006 EVAL-AD5667R 07299-007 Figure 6. Component Placement Drawing Figure 7. Component Side PCB Drawing Rev. 0 | Page 9 of 12 07299-008 EVAL-AD5667R Figure 8. Solder Side PCB Drawing Rev. 0 | Page 10 of 12 EVAL-AD5667R ORDERING INFORMATION COMPONENT LISTING Table 3. Qty 1 1 1 1 1 1 1 1 1 7 1 1 1 1 5 1 2 23 1 2 2 1 2 1 2 2 1 1 4 8 17 1 Reference Designator U1 U2 U3 U5 U6 U7 U8 U9 Y1 VOUTA, VOUTB, J1 to J4, J11 J10 J6 J7 D1 C4, C5, C15, C18, C35 C38 C26, C27 C2, C3, C6, C8, C9, C11, C12, C16, C17, C19 to C23, C25, C28 to C34, C36 C24 C1, C39 C13, C14 R1 R2, R3 R6 R7, R8 R11, R12 R10 R9 LK1, LK2, LK10, LK16 LK3 to LK8, LK11, LK13 T1 to T5, T7 to T10, T12, T13, T16 to T21 Description AD5667RBRMZ-2 ADG774BRQ AD7992BRMZ-1 AD780ARZ ADG728BRU ADP3303AR-3.3 CY7C68013-CSP 24LC64 24 MHz crystal Gold 50 SMB jack USB Mini B Power connectors Power connectors LED 10 F 10 V tantalum cap (TAJ-B package) 1 F 10 V tantalum cap (TAJ-B package) 22 pF (0603 package) 0.1 F (0603 package) Supplier/Number 1 Analog Devices Analog Devices Analog Devices Analog Devices Analog Devices Analog Devices Embassy CY7C68013-56LFC Digikey 24LC64-I/SN-ND FEC 569-872 FEC 1019324 FEC 978-6490 FEC 9632980 FEC 9632972 FEC 1226373 FEC 197-130 FEC 1135234 FEC 722-005 FEC 9406140 2.2 F (0603 package) 1 F (0603 package) 0805 package (not inserted) 1.5 Wire-wrap pin (not inserted) 1 k (0603 package) 100 k (0603 package) 2.2 k (0603 package) 10 k (0603 package) 0 (0603 package) Header (2 x 1 pin) Header (3 x 1 pin) Testpoint FEC 1108322 FEC 1288256 FEC = Farmell Electronic Components(R). ORDERING GUIDE Model EVAL-AD5667REBZ ESD CAUTION Package Description Evaluation Board Rev. 0 | Page 11 of 12 FEC 758-267 FEC 911-239 FEC 911 471 FEC 911-276 FEC 911-355 FEC 772-227 FEC 511-705 FEC 511-717 FEC 873-1144 EVAL-AD5667R NOTES (c)2008 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. EB07299-0-2/08(0) Rev. 0 | Page 12 of 12