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This version (12 Apr 2021 03:12) was approved by Mark Arthur Recio.The Previously approved version (09 Apr 2021 03:34) is available.Diff

EVALUATING THE AD9740/AD9742/AD9744/AD9748 DIGITAL-TO-ANALOG CONVERTERS

General Description

The AD9740-FMC-EBZ/AD9742-FMC-EBZ/AD9744-FMC-EBZ/AD9748-FMC-EBZ evaluation board is an FMC form-factor board with FMC connector that is compatible to the Vita 57.1 standard. This board provides the user with the flexibility to operate the AD9740, AD9742, AD9744, and AD9748 in various configurations. Output configurations include transformer-coupled, resistor terminated, and single and differential outputs. The digital inputs are designed to be driven from various word generators with the onboard option to add a resistor network for proper load termination. Provisions are also made to operate the AD9744 with either the onboard clock source (ADF4351) or with external clock configuration.

The SDP-H1 automatically formats the data and sends it to the evaluation board, which simplifies the evaluation of the device. The evaluation board receives power from the SDP-H1 power supply.

Features

  • Full-featured evaluation board for AD9740, AD9742, AD9744, and AD9748
  • ACE Software for control
  • Direct clocking vs. on-board clocking

Hardware Needed

Software Needed:

Helpful Files

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Figure 1. AD9744-FMC-EBZ Evaluation Board with SDP-H1


Tip: Click on any picture in this guide to open an enlarged version.

Quick Start Procedure

Clock, Output, and Jumper Configuration

This section details the quick start procedures for setting up the AD9740-FMC-EBZ/AD9742-FMC-EBZ/AD9744-FMC-EBZ/ AD9748-FMC-EBZ evaluation board. Refer to the table below to configure the clock and output option of the evaluation board.

The evaluation board has a provision for on-board or external clocking configuration. The on-board clocking configuration is implemented by default.

Table 1. Clock Options

The evaluation board has a provision for single-ended or differential output. The single-ended configuration is implemented by default.

Table 2. Output Options

Make sure to install the jumpers before evaluating this board. Install a 0402, 0-ohm resistor at pad number 2 (center pad) to the pad number indicated below.

Table 3. Jumper Names


Software Installation

The ACE software and DPGDownloader Lite are needed to configure the device. ACE is the software that is used to load the registers in the ADF4351 while DPGDownloader Lite is used to load the vector into the evaluation board. Install ACE from this link Analysis | Control | Evaluation (ACE) Software. During installation, expand the High-Speed DAC Components list and select the DPG Lite and HSDAC eval boards support through SDP drivers checkboxes. The plugins for this board can be downloaded from the plugin manager in the ACE software.

Figure 2. DPG Lite Installation


ACE and DPG LITE Software Demonstration

To configure the evaluation board to output a 5.0MHz sine wave at 210MSPS with DPGDownloader Lite and ACE software, take the following steps:

Configuring the EVB using ACE

Follow the steps to set-up and configure the clocking of the eval board.

  1. From the initial ACE screen, click the AD9744-FMC-EBZ.
  2. On the Clocking Setup Tab, select Onboard clock (ADF4351) on the clock source drop-down menu, and enter 210MHz on the DAC clock field. Refer to the Figure 3.
  3. Click Apply and a summary window will pop up. Confirm if the entered details are correct.

Figure 3. AD9744 Plugin Board Wizard


Loading a vector using DPGDownloader Lite

Follow the steps to generate and download a vector into the eval board.

  1. Confirm first if the DCO frequency detected is the same as the clock frequency set on ACE (210MHz). Repeat the ACE process if frequencies don't match.
  2. In the DPGDownloader Lite window (see Figure 4), click the Add Generated Waveform dropdown menu and select Single Tone as the vector type.
  3. Refer to Figure 4 for the appropriate frequency values and default settings.
  4. In the Data Playback panel, select the 1I: Single Tone - 5.01 MHz; 0.0 dB; 0.0° (In-Phase) option from the I Data Vector dropdown menu.
  5. Select the 1Q: Single Tone - 5.01 MHz; 0.0 dB; 0.0° (Quadrature) option from the Q Data Vector dropdown menu.
  6. Click the Download button in the lower right of the Data Playback panel.
  7. Click the Play button, located to the left of the Download button, to begin vector playback.
  8. The signal frequency output then appears on the spectrum analyzer.

Figure 4. DPG Lite Panel


Verification

Figure 5 below shows the spectrum analyzer output window that appears on the spectrum analyzer hardware (see Figure 5). Ensure that the following options are set:

  1. Connect Spectrum Analyzer to SMA J1.
  2. Set the Stop frequency to 105.0MHz.
  3. Set the Ref level to 0 dBm.
  4. Set the #Res BW to 220 Hz.
  5. Set the VBW to 220 Hz.
  6. Check that the DAC output, the top right Mrkr1, is approximately 5.0000 MHz and check that the amplitude is approximately 0 dBm.

Figure 5. AD9744 Output Spectrum


Troubleshooting

On-Board LEDs

There are two LEDs on the evaluation board, which are the 3.3V power supply LED, and the ADF4351 lock detect LED. These LEDs are shown in Figure 6. These two LEDs will light up when 3.3V is supplied to the board, and when the ADF4351 clock chip is working properly.

Figure 6. AD9744-FMC-EBZ Evaluation Board LEDs


DPGDownloader Lite Does Not Recognize the Evaluation Board

There may be cases where the DPGDownloader Lite does not recognize the evaluation board. If this occurs, open the DPGDownloader Lite and unplug then replug the USB cable. If DPGDownloader Lite still does not recognize the evaluation board, there is a chance that the firmware of the board is not updated and the evaluation board must be reprogrammed with the new firmware. Contact a local Analog Devices salesperson or distributor to arrange for this reprogramming to be done.


ACE Does Not Recognize the Evaluation Board

There may be cases where the AD9744 icon does not appear on the Attached Hardware tab of ACE, or the icon is there but once clicked, will indicate an Unavailable status on the bottom as shown in the figure on the right.

These errors can occur if the ACE software is started before powering up and connecting the evaluation board to the PC, or if the evaluation board is power cycled and ACE is not restarted. The most basic remedy for this issue is to close ACE and reopen it (restart). As long as the evaluation board is powered up
and connected to the PC, ACE recognizes
the evaluation board and will work again.

Figure 7. Unavailable state error in ACE


DCO Frequency is not correct or not detected

Check if the proper resistors are installed indicated in Table 1. If using the Onboard clock, check if DS2 LED lights up. If not, restart ACE and then reprogram the board with the desired clock frequency. If using an external clock source, increase the output power level to 20dBm. Make sure the resistors installed are properly soldered.


DAC Output Frequency is not correct

Check if the DCO Frequency detected on the DPG Panel matches the Data Rate field. These two should match for proper vector generation and playing to the DAC.

resources/eval/dpg/eval-ad9744.txt · Last modified: 12 Apr 2021 03:12 by Mark Arthur Recio