ANALOG DEVICES EVAL-AD4858 8-Channel Simultaneous Sampling 20-Bit 1 MSPS Data Acquisition System User Guide

ANALOG DEVICES EVAL-AD4858 8-Channel Simultaneous Sampling 20-Bit 1 MSPS

Data Acquisition

INTRODUCTION

FEATURES

• Full featured evaluation board for the AD4858
• Eight input channels available through SMA connectors
• On-board reference circuit and power supplies
• Standalone capability through FMC connector and/or test points
• PC software for control and data analysis of the time and frequency domain
• ZedBoard-compatible
• Compatible with other FMC controller boards

EQUIPMENT NEEDED

• PC running Windows® 10 operating system or higher
• Digilent ZedBoard with 12 V wall adapter power supply
• Precision signal source
• SMA cables (inputs to evaluation board)
• USB cable

SOFTWARE NEEDED

• ACE evaluation software
• AD4858 ACE plugin from plug-in manager

GENERAL DESCRIPTION

The EVAL-AD4858FMCZ is designed to demonstrate the performance of the AD4858 and provide access to many included configuration options that are accessed via an easy to use ACE plug-in graphical interface. The AD4858 is a fully buffered, 8-channel simultaneous sampling, 20-bit, 1 MSPS data acquisition system (DAS) with differential, wide common mode range inputs.

The EVAL-AD4858FMCZ on-board components include also the following

• The LTC6655 high precision, low drift, 4.096 V voltage reference (not used by default)
• The LT1761, low noise, 1.8 V, 2.5 V, and 5 V low dropouts (LDOs)
• The LT8330 low quiescent current (IQ) boost converter

For full details on the AD4858, see the AD4858 data sheet, which must be consulted in conjunction with this user guide when using the EVAL-AD4858FMCZ.

EVALUATION BOARD KIT CONTENTS

• EVAL-AD4858FMCZ evaluation board
•  Micro-SD memory card (with adapter) containing system board boot software and Linux OS

EVALUATION BOARD PHOTOGRAPH

Figure 1. Evaluation Board Photograph

QUICK START GUIDE

1. Download and install the ACE Software tool from the ACE download page, as per the Installing the ACE Evaluation Soft-ware section. If ACE is already installed, make sure you have the latest version by using Check For Updates option in the ACE sidebar, as shown in Figure 2.

Figure 2. Check For Updates Option in the ACE Sidebar

2. ACE sidebar to install the board plug-in that supports the product evaluation board and select Available Packages, as shown in Figure 3. You can use the search field to help filter the list of boards to find the relevant one. An ACE Quickstart guide is available here at ACE Quickstart Using ACE and Installing Plugins.

Figure 3. Plug-in Manager Option in the Sidebar

3. Insert the SD card into the SD card slot on the underside of the ZedBoard. If there is a need to reimage or create a new SD card, instructions are available at the following website: ADI Kuiper Linux with support for ACE Evaluation.
4. Ensure the ZedBoard boot configuration jumpers are set to use the SD card as shown in Figure 4. To avoid potential damage, ensure the VADJ SELECT jumper is set to the correct voltage for the EVAL-AD4858FMCZ. Figure 4. ZedBoard Boot Configuration Jumpers
5. Connect the AD4858 evaluation board to the FMC connector on the ZedBoard.
6. Connect the USB cable from the PC to the J13/USB OTG port, and connect the 12 V power supply to J20/DC input.
7. Slide the SW8/POWER switch in the ZedBoard to the on position. The green LD13/POWER LED turns on and is followed by the blue LD12/DONE LED (within the ZedBoard). The DS1 LED in the EVAL-AD4858FMCZ will also turn on.
8. The red LD7 LED blinks approximately 20 to 30 seconds later, indicating the boot process is complete.
9. Launch the ACE software from the Analog Devices folder in the Windows Start menu. The evaluation board appears on the ACE Start tab in the Attached Hardware view.

EVALUATION BOARD HARDWARE
The AD4858 is a fully buffered, 8-channel simultaneous sampling, 20-bit 1 MSPS DAS with differential, wide common mode range inputs. The AD4858 has an on- chip low drift 4.096 V internal volt-age reference, but, optionally, it also accepts an external reference applied through the REFIO pin and provided on- board (LTC6655). The device operates from different power rails, provided through on-board LDOs as described in Power Supplies section. An option to connect external supplies exists and is explained in Table 1.
Table 1. Jumper Details with Factory Default Setting

Link Default Position Function

JODIFF to J7DIFF| Not inserted| Offset Calibration Jumper. Inserting the JODIFF to J7DIFF jumper link allows short-circuiting the corresponding pair of
---|---|---
| | inputs in order to measure the AD4858 offset and/or perform and offset calibration.
J0+ to J7+| Not inserted| Analog Input to Ground Connection. Insert the J0+ to J7+ jumper link to connect to the AGND pin, the corresponding
| | positive analog input.
J0− to J7−| Not inserted| Analog Input to Ground Connection. Insert the J0− to J7− jumper link to connect to the AGND pin, the corresponding
| | negative analog input.
JV12V| A| The JV12V link selects the power supply source for the evaluation board.
| | In Position A, the unregulated supply to the on-board LDOs is taken from the ZedBoard 12 V supply.
| | In Position B, the unregulated external supply to the on-board LDOs is taken from the V12V_EXT connector.
JSHIFT| A| The JSHIFT link selects the power supply type for the AD4858.
| | In position A, the VCC pin = +24 V and the VEE pin = −24 V.
In position B, the VCCpin = +44 V and the VEE pin = −4 V.
If not inserted, the VCC pin = +24 V and the VEE pin = −4 V.
JVCC| A| The JVCC link selects the VCC pin supply source.
In position A, the VCC pin is provided by the on board LT8330 DC/DC converter. In position B, the VCC pin is provided though VCC_EXT connector.
JVEE| A| The JVEE link selects the VEE pin supply source.
In position A, the VEE pin is provided by the on board LT8330 DC-to-DC converter. In position B, the VEE pin is provided though VEE_EXT connector.
JVDDH| A| The JVDDH link selects the VDDH pin supply source.
In position A, the VDDH pin is provided by the on board LT1761 2.5 V LDO. In position B, the VDDH pin is provided though VDDH_EXT connector.
If not inserted, VDDH pin can be tied to the AGND pin by inserting an R40 resistor. To disable the internal LDO, tie the VDDH pin to the GND pin. With the regulator disabled, connect the VDDL pin to an external supply in the range of 1.71 V to 1.89 V through the JVDDL link.
JVDD| A| The JVDD link selects the VDD pin supply source.
In position A, the VDD pin is provided by the on board LT1761 5 V LDO. In position B, the VDD pin is provided though VDD_EXT connector.
JVDDL| Not inserted| The JVDDL link selects the VDDL pin supply source.
In position A, the VDDL pin is provided by the on-board LT1761 1.8 V LDO. To use this configuration, tie the VDDH pin to ground through the JVDDH link.
| | In position B, the VDDL pin is provided though the VDDL_EXT connector. To use this configuration, tie the VDDH pin to ground through the JVDDH link.
| | If not inserted, the internal LDO is used for the JVDDH link to be in position A or B.
JVIO| Not inserted| The JVIO link selects the VIO pin supply source. If not inserted, the VIO pin is taken from the ZedBoard (default). Alternatively, the VIO pin can be supplied from either the on-board LDOs or an external supply.
In position A, the VIO pin is provided by the on board LT1761 LDO with an output voltage dependent on the JVIO_LDO link.
The R66 resistor (shown in Figure 20) is unsoldered.
| | In position B, the VIO pin is provided though VIO_EXT connector. The R66 resistor is unsoldered.
Note the field programmable gate array (FPGA) image provided works at 2.5 V digital level, so use caution when changing the default position of the JVIO link jumper.
JVIO_LDO| Not inserted| The JVIO_LDO link selects the LT1761 LDO output voltage when the JVIO link is in position B. Inserted, the LT1761 output voltage is 3.3 V.
Not inserted, the LT1761 output voltage is 1.8 V.

HARDWARE LINK OPTIONS
Table 1 details the link option functions and the default power link options. The EVAL-AD4858FMCZ can be powered from different sources, as described in the Power Supplies section. By default, the power supply required for the EVAL- AD4858FMCZ comes from the ZedBoard controller board. The power supply is regulated by the on-board regulators that generate the required bipolar supplies.

EVALUATION BOARD HARDWARE

CONNECTORS AND SOCKETS
The connectors and sockets on the EVAL-AD4858FMCZ are out-lined in Table 2.

Table 2. On-Board Connectors

Connector Function

• SMA0+ to SMA7+ Positive analog input subminiature version A (SMA) to
• Channel 0 through Channel 7
• SMA0− to SMA7− Negative analog input SMA to Channel 0 through Channel 7
• P1 FPGA mezzanine card (FMC) connector

POWER SUPPLIES
The ZedBoard supplies 12 V to power the rails for the different components on the EVAL-AD4858FMCZ. The AD4858 uses the following five power supply pins

• Positive high voltage power supply ( the VCC pin)
• Negative high voltage power supply (the VEE pin)
• Low voltage power supply (the VDD pin)
• 1.8 V power supply (the VDDL pin)
• Digital power supply (the VIO pin)

A combination of the LT8330 DC-to-DC converter and the LT1761 LDO generate all the needed supply rails on the board.
Table 3. Default Power Supplies Available in EVAL-AD4858FMCZ

Power Supply (V) Function Component

EVALUATION BOARD SOFTWARE

SOFTWARE INSTALLATION PROCEDURE
Download the ACE evaluation software from the EVAL-AD4858FMCZ evaluation kit page. Install the software on a PC before using the EVAL-AD4858FMCZ kit. Download the AD4858 ACE plug-in from the EVAL-AD4858FMCZ page or from the plug-in manager in ACE.
Perform the following steps to complete the installation process

1. Install the ACE evaluation software.
2. Install the AD4858 plug-in. The ACE Quickstart page shows the plug-in installation guide.

Warning
Install the ACE software before connecting the EVAL-AD4858FMCZ and ZedBoard to the PC’s USB port to ensure that the evaluation system is properly recognized when it is connected.

Installing the ACE Evaluation Software
To install the ACE evaluation software, take the following steps:

1. Download the ACE software to a Windows-based PC.

2. Double click the ACEInstall.exe file to begin the installation. By default, the ACE software is saved to the following location: C:\Program Files (x86)\Analog Devices\ACE.

3. A dialog box opens asking for permission to allow the program to make changes to the PC. Click Yes to start the installation process

4. In the ACE Setup window, click Next > to continue the installation.
   
   Figure 5. Evaluation Software Install Confirmation

5. Read the software license agreement and click I Agree.
   
   Figure 6. License Agreement
   

6. Click Browse... to choose the installation location and then click
   Figure 7. Choose Install Location Window

7. The ACE software components to install are preselected. Click Install .
   Figure 8. Choose Components

8. The Windows Security window opens . Click Install. No action  is required.
   **EVALUATION BOARD SOFTWARE

Figure 9. Windows Security Window**

9. The installation is in progress. No action required.
   Figure 10. Installation in Progress

10. When the installation completes, click Next > , and then click Finish.

Figure 11. Installation complete

Disconnecting the EVAL-AD4858FMCZ
Always disconnect power from the ZedBoard, through the SW8/POWER switch, before disconnecting the EVAL-AD4858FMCZ from the FMC connector.

ACE SOFTWARE OPERATION

LAUNCHING THE SOFTWARE
To start the ACE evaluation software, open the Windows Start menu and click Analog Devices > ACE. The software window con-tinues loading until the software recognizes the AD4858 evaluation board. When the software recognizes the board, double-click on the icon in the Start view to open the main window seen in Figure 12. For more detailed information about ACE, refer to the ACE user guide (Analysis | Control | Evaluation – ACE Software).

Note the Power yellow LED (LD13) and the Done blue LED (LD12) are turned on.

Figure 12. Board View

Chip View
Hover over the AD4858 symbol in the Board View and double click to enter the Chip View (Figure 13).

Figure 13. Chip View

In this view, you can configure the AD4858 per channel SoftSpan , offset, gain, and phase values by left or right clicking the dark blue symbols (see Figure 14 and Figure 15) by choosing the appropriate field from a drop-down window.

Figure 14. Setting the Per Channel SoftSpan Range

Figure 15. Setting the Per Channel Offset, Gain and Phase

Selecting the Configure Channels button allows for a global con-figuration of the channel settings while the Proceed to Memory Map radio button allows direct access and programing of the AD4858 memory registers. Note that the Apply Changes button must be selected each time a setting is changed to take effect.

ANALYSIS VIEW
Click Proceed to Analysis to navigate to the AD4858 Analysis window. From here, choose the type of analysis to be performed by selecting the Waveform tab, the FFT tab, or the Histogram tab. Select options for Run Once or Run Continuous to begin captur-ing data which will appear in the Results section and Waveform plot window. Select channel results to be displayed in Displayed Channels section (default is display all).

Waveform Tab
The Waveform tab displays data in the form of time vs. discrete data values with the results, as shown in Waveform Tab.

ACE SOFTWARE OPERATION

Figure 16. Waveform Tab

The Waveform graph shows each successive sample of the AD4858 output. The user can zoom in on and pan over the Wave-form graph using the embedded waveform tool bar located above the graph. Select the channels to display in the Display Channels section.
Under the Display Units pull-down menu, select Codes above the Waveform graph to select whether the Waveform graph displays in units of Codes, Hex, or Volts. The axis controls are dynamic.

FFT tab
The FFT tab displays fast Fourier transform ( FFT ) information for the last batch of samples gathered (see Figure 17).
When performing an FFT analysis, the RESULTS pane shows the noise and distortion performance of the AD4858. The sig-nalto-noise ratio (SNR) and other noise performance measure-ments, such as the signal-to-noise-and- distortion (SINAD), Dynam-ic Range, noise density (Noise/Hz), and peak harmonic or spuri-ous noise ( SFDR ), are shown in the Results section. The total harmonic disturbance ( THD ) measurements, as well as the major harmonics contributing to the THD performance, are shown as well.

Figure 17. FFT Analysis of a 200 Hz Sine Wave at 1 MSPS

EVALUATION BOARD SCHEMATIC AND ARTWORK

Figure 19. Analog Inputs Schematic

EVALUATION BOARD SCHEMATIC AND ARTWORK

Figure 20. Power Solution Schematic

EVALUATION BOARD SCHEMATIC AND ARTWORK

Figure 21. FMC Connection Schematic

ESD Caution
ESD (electrostatic discharge) sensitive device. Charged devices and circuit boards can discharge without detection. Although this product features patented or proprietary protection circuitry, damage may occur on devices subjected to high energy ESD. Therefore, proper ESD precautions should be taken to avoid performance degradation or loss of functionality.

Legal Terms and Conditions
By using the evaluation board discussed herein (together with any tools, components documentation or support materials, the “Evaluation Board”), you are agreeing to be bound by the terms and conditions set forth below (“Agreement”) unless you have purchased the Evaluation Board, in which case the Analog Devices Standard Terms and Conditions of Sale shall govern. Do not use the Evaluation Board until you have read and agreed to the Agreement. Your use of the Evaluation Board shall signify your acceptance of the Agreement. This Agreement is made by and between you (“Customer”) and Analog Devices, Inc. (“ADI”), with its principal place of business at Subject to the terms and conditions of the Agreement, ADI hereby grants to Customer a free, limited, personal, temporary, non-exclusive, non-sublicensable, non-transferable license to use the Evaluation Board FOR EVALUATION PURPOSES ONLY. Customer understands and agrees that the Evaluation Board is provided for the sole and exclusive purpose referenced above, and agrees not to use the Evaluation Board for any other purpose. Furthermore, the license granted is expressly made subject to the following additional limitations: Customer shall not

1. rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and
2. permit any Third Party to access the Evaluation Board. As used herein, the term “Third Party” includes any entity other than ADI, Customer, their employees, affiliates and in-house consultants. The Evaluation Board is NOT sold to Customer; all rights not expressly

granted herein, including ownership of the Evaluation Board, are reserved by ADI. CONFIDENTIALITY.

This Agreement and the Evaluation Board shall all be considered the confidential and proprietary information of ADI. Customer may not disclose or transfer any portion of the Evaluation Board to any other party for any reason. Upon discontinuation of use of the Evaluation Board or termination of this Agreement, Customer agrees to promptly return the Evaluation Board to ADI. ADDITIONAL RESTRICTIONS. Customer may not disassemble, decompile or reverse engineer chips on the Evaluation Board. Customer shall inform ADI of any occurred damages or any modifications or alterations it makes to the Evaluation Board, including but not limited to soldering or any other activity that affects the material content of the Evaluation Board. Modifications to the Evaluation Board must comply with applicable law, including but not limited to the RoHS Directive. TERMINATION. ADI may terminate this Agreement at any time upon giving written notice to Customer. Customer agrees to return to ADI the Evaluation Board at that time. LIMITATION OF LIABILITY.

THE  EVALUATION BOARD PROVIDED HEREUNDER IS PROVIDED “AS IS” AND ADI MAKES NO WARRANTIES OR REPRESENTATIONS OF ANY KIND WITH RESPECT TO IT. ADI SPECIFICALLY DISCLAIMS ANY REPRESENTATIONS, ENDORSEMENTS, GUARANTEES, OR WARRANTIES, EXPRESS OR IMPLIED, RELATED TO THE EVALUATION BOARD INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTY OF MERCHANTABILITY, TITLE, FITNESS FOR A PARTICULAR PURPOSE OR   OF

INTELLECTUAL PROPERTY RIGHTS. IN NO EVENT WILL ADI AND ITS LICENSORS BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT, OR CONSEQUENTIAL DAMAGES RESULTING FROM CUSTOMER’S POSSESSION OR USE OF THE EVALUATION BOARD, INCLUDING BUT NOT LIMITED TO LOST PROFITS, DELAY COSTS, LABOR COSTS OR LOSS OF GOODWILL. ADI’S TOTAL LIABILITY FROM ANY AND ALL CAUSES SHALL BE LIMITED TO THE AMOUNT OF ONE HUNDRED US DOLLARS ($100.00). EXPORT.

Customer agrees that it will not directly or indirectly export the Evaluation Board to another country, and that it will comply with all applicable United States federal laws and regulations relating to exports. GOVERNING LAW. This Agreement shall be governed by and construed in accordance with the substantive laws of the Commonwealth of Massachusetts (excluding conflict of law rules). Any legal action regarding this Agreement will be heard in the state or federal courts having jurisdiction in Suffolk County, Massachusetts, and Customer hereby submits to the personal jurisdiction and venue of such courts. The United Nations Convention on Contracts for the International Sale of Goods shall not apply to this Agreement and is expressly disclaimed.

References

• Mixed-signal and digital signal processing ICs | Analog Devices
• AD4858 Datasheet and Product Info | Analog Devices
• Analysis | Control | Evaluation - ACE Software [Analog Devices Wiki]
• ACE Quickstart - Using ACE and Installing Plug-ins [Analog Devices Wiki]
• ADI Kuiper Linux with support for Evaluation [Analog Devices Wiki]
• ACE-Software | Analog Devices
• LT1761 Datasheet and Product Info | Analog Devices
• LT8330 Datasheet and Product Info | Analog Devices
• EVAL-AD4858 Evaluation Board | Analog Devices

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