• AD5668

• EVAL-AD5668SDCZ
• EVAL-AD5668SDRZ

This document presents the steps to setup an environment for using the EVAL-AD5668SDZ evaluation board together with the Xilinx KC705 FPGA board and the Xilinx Embedded Development Kit (EDK). Below is presented a picture of the EVAL-AD5668SDZ Evaluation Board with the Xilinx KC705 board.

Below is presented a picture of SDP-B Controller Board with the EVAL-AD5668SDZ Evaluation Board.

The EVAL-AD5668EBZ / AD5668SD_Z evaluation board is a member of a growing number of boards available for the SDP. Designed to help customers evaluate performance or quickly prototype new AD5668 circuits and reduce design time, the EVAL-AD5668EBZ / AD5668SD_Z evaluation board can operate from a single 2.7 V to 5.5 V supply. The part incorporates an internal 1.25 V or 2.5 V on-board reference to give an output voltage span of 2.5 V or 5 V, respectively. The on-board reference is off at power-up allowing for the use of an external reference; the REF195 is used on this evaluation board. The AD5668 must be written to after power-up to turn on the internal reference.

The AD5668 is a low power, octal, 16-bit, buffered voltage-output DAC. The device operates from a single 2.7 V to 5.5 V supply and is guaranteed monotonic by design. The AD5668 has an on-chip reference with an internal gain of 2. The AD5668-1 has an 1.25 V 5 ppm/°C reference, giving a full-scale output range of 2.5 V; the AD5668-2, -3 has a 2.5 V 5 ppm/°C reference, giving a full-scale output range of 5 V. The on-board reference is off at power-up, allowing the use of an external reference. The internal reference is enabled via a software write. The AD5668 utilizes a versatile 3-wire serial interface that operates at clock rates of up to 50 MHz and is compatible with standard SPI®, QSPI™, MICROWIRE™, and DSP interface standards. The on-chip precision output amplifier enables rail-to-rail output swing.

• AD5668 Product Info - pricing, samples, datasheet
• EVAL-AD5668EBZ evaluation board user guide
• Xilinx KC705 FPGA board

The first objective is to ensure that you have all of the items needed and to install the software tools so that you are ready to create and run the evaluation project.

• Xilinx KC705 FPGA board
• FMC-SDP adapter board
• EVAL-AD5668 evaluation board

• Xilinx ISE 14.6.
• UART Terminal (Termite/Tera Term/Hyperterminal), baud rate 115200.
• The EVAL-AD5668 reference project for Xilinx KC705 FPGA.

• Use the FMC-SDP interposer to connect the ADI evaluation board to the Xilinx KC705 board on the FMC LPC connector.
• Connect the JTAG and UART cables to the KC705 and power up the FPGA board.

The following commands were implemented in this version of EVAL-AD5668 reference project for Xilinx KC705 FPGA board.

Commands can be executed using a serial terminal connected to the UART peripheral of Xilinx KC705 FPGA.

The following image shows a generic list of commands in a serial terminal connected to Xilinx KC705 FPGA's UART peripheral.