9-6; Rev 0; 5/ MAX56PMB Peripheral Module General Description The MAX56PMB peripheral module provides the necessary hardware to interface the MAX56 6-bit DAC to any system that utilizes PmodK-compatible expansion ports configurable for SPI communication. The IC is a single-channel, low-power, buffered voltage-output DAC. The reference voltage for the DAC is provided by a.5v output version of the MAX609 voltage reference (0.5% initial accuracy, 0ppm/ C). Digital noise is minimized by having SPI input buffers powered down after completion of each serial input frame. Refer to the MAX56 IC data sheet for detailed information regarding operation of the IC. Ordering Information appears at end of data sheet. S High-Accuracy 6-Bit DAC with On-Board Precision Voltage Reference S Low Gain and Offset Errors Features S Buffered Voltage Output Directly Drives 0kI Loads S Optional External Voltage Reference (Jumper Selectable) S 6-Pin Pmod-Compatible Connector (SPI) S Example Software Written in C for Portability S RoHS Compliant S Proven PCB Layout S Fully Assembled and Tested MAX56PMB Peripheral Module Pmod is a trademark of Digilent Inc. Maxim Integrated Products For pricing, delivery, and ordering information, please contact Maxim Direct at -888-69-6, or visit Maxim s website at www.maxim-ic.com.
Component List DESIGNATION QTY DESCRIPTION C C C, C, C5 F 0FF Q0%, 0V X5R ceramic capacitor (060) TDK C0X5RA06K/.5 FF Q0%, 0V X7R ceramic capacitor (060) TDK C608X7RA05K 0.FF Q0%, 6V X7R ceramic capacitors (060) Murata GRM88R7C0KA0D.7FF EMI filter (-terminal capacitor) Murata NFMPC75BAD J 6-pin right-angle male header DESIGNATION QTY DESCRIPTION J -pin straight male header JP -pin straight male header R, R, R 50I Q5% resistors (060) R.7kI Q5% resistor (060) U U 6-bit buffered single DAC (8 FMAX M ) Maxim MAX56GUA+ Ultra-precision series voltage reference (5 SOT) Maxim MAX609EUK5+ Shorting jumper PCB: EPCB56PM Component Suppliers SUPPLIER PHONE WEBSITE Murata Electronics North America, Inc. 770-6-00 www.murata-northamerica.com TDK Corp. 87-80-600 www.component.tdk.com Note: Indicate that you are using the MAX56PMB when contacting these component suppliers. Detailed Description SPI Interface The MAX56PMB peripheral module can plug directly into a Pmod-compatible port (configured for SPI) through connector J. For information on the SPI protocol, refer to the MAX5/MAX56 IC data sheet. J provides connection of the module to the Pmod host. See Table. Connector J provides connection to the IC pins. Jumper JP allows the user to select between reference voltages for the DAC IC (see Table ). Reference Voltage The MAX56PMB peripheral module contains a MAX609 precision voltage reference for the REF input of the IC. The MAX609 outputs a.5v reference. Software and FPGA code Example software and drivers are available that execute directly without modification on several FPGA development boards that support an integrated or synthesized microprocessor. These boards include the Digilent Table. Connector J (-Wire Communication) PIN SIGNAL DESCRIPTION SS Chip enable. Assert low to enable the SPI interface. MOSI MAX56 serial-data input N.C. Not connected SCK MAX56 serial-clock input 5 Ground 6 Power supply Table. Connector J PIN SIGNAL DESCRIPTION DACOUT Buffered DAC output CLR Active-low asynchronous digital-clear input. Drive low to clear contents of the DAC registers and set the DAC output to zero. VREFIN DAC reference voltage input Ground µmax is a registered trademark of Maxim Integrated Products, Inc. Maxim Integrated Products
Nexys, Avnet LX9, and Avnet ZEDBoard, although other platforms can be added over time. Maxim provides complete Xilinx ISE projects containing HDL, Platform Studio, and SDK projects. In addition, a synthesized bit stream, ready for FPGA download, is provided for the demonstration application. Table. Jumper JP (Reference Voltage Selection) PINS - - SELECTION REF provided by on-board MAX609EUK5 voltage reference REF provided by user through pin of connector J The software project (for the SDK) contains several source files intended to accelerate customer evaluation and design. These include a base application (maximmodules.c) that demonstrates module functionality and uses an API interface (maximdevicespecificutilities.c) to set and access Maxim device functions within a specific module. The source code is written in standard ANSI C format, and all API documentation including theory/operation, register description, and function prototypes are documented in the API interface file (maximdevicespecificutilities.h &.c). The complete software kit is available for download www.maxim-ic.com. Quick start instructions are also available as a separate document. J 5 6 R R R 50 50 50 SS MOSI SCK F EMIFILT C 0uF R.7k C uf U C 0.uF C 0.uF U IN OUT N.C. N.C. MAX609EUK5+ 5 MOSI SCK SS 5 7 8 DIN SCLK CS CLR VDD OUT REF 6 DACOUT C5 0.uF CLR VREFIN J JP MAX56GUA+ Select VREF source Figure. MAX56PMB Peripheral Module Schematic Maxim Integrated Products
Figure. MAX56PMB Peripheral Module Component Placement Guide Component Side Figure. MAX56PMB Peripheral Module PCB Layout Component Side Figure. MAX56PMB Peripheral Module PCB Layout Inner Layer (Ground) Maxim Integrated Products
Figure 5. MAX56PMB Peripheral Module PCB Layout Inner Layer (Power) Figure 6. MAX56PMB Peripheral Module PCB Layout Solder Side Figure 7. MAX56PMB Peripheral Module Component Placement Guide Solder Side Maxim Integrated Products 5
Ordering Information PART MAX56PMB# #Denotes RoHS compliant. TYPE Peripheral Module Maxim Integrated Products 6
REVISION NUMBER REVISION DATE DESCRIPTION Revision History PAGES CHANGED 0 5/ Initial release Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. Maxim Integrated Products, 0 San Gabriel Drive, Sunnyvale, CA 9086 08-77-7600 7 0 Maxim Integrated Products Maxim is a registered trademark of Maxim Integrated Products, Inc.