User Guide | EVAL-AD7091R-8
UG-2324
Evaluation Board for the Multichannel Ultra-Low Power 12-Bit ADC

FEATURES

► Full featured evaluation board for the AD7091R-2/ AD7091R-4/ AD7091R-8 family
► On-board power supplies
► Standalone capability
► System demonstration platform (SDP) compatible
► (EVAL-SDP-CK1Z)
► PC software for control and data analysis (download from product page)
EVALUATION KIT CONTENTS
► EVAL-AD7091R-8ARDZ evaluation board
ADDITIONAL EQUIPMENT NEEDED
► EVAL-SDP-CK1Z (must be ordered separately and includes a USB cable)
► Signal source
► PC running Windows 10 with a USB 2.0 port

EVALUATION BOARD PHOTOGRAPH

GENERAL DESCRIPTION

The EVAL-AD7091R-8ARDZ is a full featured evaluation board designed to allow easy evaluation of all of the features of the AD7091R-8 family of analog-to-digital converters (ADCs). The evaluation board can be controlled via the SDP board (EVAL-SDPCK1Z), which allows the evaluation board to be controlled through the USB port of a PC using the evaluation board software available for download from the product page.
The  EVAL-AD7091R-8ARDZ can be used as a reference for the performance of the AD7091R-2/AD7091R-4, AD7091R, and AD7091. These devices share the same ADC core but differ in the number of multiplexed channels. The entire AD7091 family shares the same ADC core, so to evaluate the AD7091R-2 enable two channels. For AD7091R-4, enable four channels.
To evaluate the single channel AD7091R and AD7091, enable one channel only.
On-board components include: the AD8031 high speed precision rail-to-rail operational amplifier (op amp), the ADA4807-1 zero drift rail-to-rail dual op amp, the MAX17291 voltage boost converter with lowest quiescent current and highest efficiency across load
currents , the ADP7118 high accuracy 200mA low dropout linear regulator, and the ADR3625, 2.5V precision micropower, low dropout, low voltage reference.

EVALUATION BOARD SOFTWARE

The Analog Devices, Inc., Analysis | Control | Evaluation (ACE) desktop software provides a plug and play evaluation experience, enabling users to get up and running quickly with the product evaluation board. ACE can configure the embedded software on supported controller boards and provides a fast and easy way to get set up, configure the board, and perform data capture, analysis, and/or waveform generation. The ACE software supports the EVALSDP-CK1Z controller board with the EVAL-AD7091R-8ARDZ.
For ACE installation and documentation instructions, see the ACE product page for additional information. Follow the instructions to install the necessary evaluation board plugin support.
If the computer ACE is installed on has internet access, find/install/update plugins directly from the ACE application.
For environments without internet access, download the plugins from the product page to a portable storage and install the plugins into the ACE software.
Note that the product-specific documentation for the evaluation software can be found within the ACE plugin.

QUICK START GUIDE

Follow these steps to quickly evaluate the AD7091R-2/AD7091R-4/AD7091R-8 ADCS:

1. Install the evaluation software from the AD7091R-2/AD7091R-4/AD7091R-8 product page. Ensure that the EVAL-SDP-CK1Z board is disconnected from the USB port of the PC while installing the software. The PC may need to be restarted after the installation.
2. Ensure that the various link options are configured as outlined in Link Configuration Options section.
3. Connect the EVAL-SDP-CK1Z board to the EVAL-AD7091R-8ARDZ board as shown in Figure 2.
4. Connect the EVAL-SDP-CK1Z board to the PC via the USB cable. For Windows® XP, you may need to search for the EVAL-SDP-CK1Z drivers. Choose to automatically search for the drivers for the EVAL-SDP-CK1Z board if prompted by the operating system.
5. Launch the ACE evaluation software.
6. For a unipolar signal, input signals are via J1 and J2 or from VINO to VIN 6.
7. A bipolar signal must use the bias circuit, BPIN. Input a bipolar signal to BPIN, which will go through VIN7 of the ADC. To test the other inputs, you can connect the BIAS test point to TVINO to TVIN6.

HARDWARE DESCRIPTION

This user guide describes the evaluation board for the AD7091R-2/AD7091R-4/AD7091R-8 family of ADCs. The EVALAD7091R-8ARDZ can be used as a reference to evaluate
AD7091R-2/-4, AD7091R, and AD7091. The entire AD7091 family shares the same ADC core, so to evaluate the AD7091R-2, enable two channels. For the AD7091R-4, enable four channels.. And to evaluate the single channel AD7091R and AD7091, enable one channel only. For more information, open the AD7091R-8 plugin from ACE, click Proceed to Documentation and then click Analysis View.
All models in this family are 12-bit, ultra-low power, successive approximation ADCs. These devices operate from a single 2.7V to 5.25V power supply and can achieve a throughput rate of 1MSPS.
These ADCs also feature an on chip conversion clock, an accurate reference, and a high-speed serial interface.
The conversion process and data acquisition are controlled using a CONVST signal and an internal oscillator. The AD7091R-2/ AD7091R-4/AD7091R-8 devices have a serial interface allowing data to be read after the conversion while achieving a 1MSPS throughput rate. This family of devices uses advanced design and process techniques to achieve ultra-low power dissipation at high throughput rates. An on chip, accurate 2.5V reference is available.
Complete specifications for the AD7091R-2/AD7091R-4/ AD7091R-8 devices are provided in the device data sheet, available from Analog Devices, Inc., which should be consulted in conjunction with this user guide when using the evaluation board.
Full details on the EVAL-SDP-CK1Z are available on the product page.

EVAL-AD7091R-8ARDZ, EVAL-SDP-CK1Z, AND HOST PC HARDWARE CONNECTIONS
Before powering up the EVAL-SDP-CK1Z board, mount the EVALAD7091R-8ARDZ onto the EVAL-SDP-CK1Z board. Ensure that the link options are in the default positions as outlined in Table 3.
Also, before connecting the EVAL-SDP-CK1Z board to your PC, ensure that the evaluation software has been installed. The full software installation procedure is detailed in the Evaluation Board Software section.
Finally, mount the EVAL-AD7091R-8ARDZ to the EVAL-SDP-CK1Z as shown in Figure 2 which shows the connections between the EVAL-AD7091R-8ARDZ daughter board and the EVAL-SDP-CK1Z board.

POWER SUPPLIES
Care should be taken before applying power and signals to the evaluation board. To ensure that all link positions are set according to the required operating mode, see the
Table 1 shows the default power supplies available in the EVALAD7091R-8ARDZ.

Table 1. Default Power Supplies

STANDALONE MODE
The EVAL-AD7091R-8ARDZ evaluation board is powered by a 5V supply through the EVAL-SDP-CK1Z. If the evaluation board is used without the EVAL-SDP-CK1Z, it will go into standalone mode.
For the complete list of link options for an external power supply, see Table 2.
For its power source, ensure that LK_3 is connected to Position B (Pin 2 and Pin 3) so that an external power supply of 5V can be connected to P-24.

VDRIVE requires an external supply of 5V that must be connected to XLDO during standalone mode to be able to use the LDO regulators, 1.8V or 3.3V.
Note of the following:
► When using XLDO, only one VDRIVE source must be populated.
► For 3.3V, populate R145.
► For 1.8V, populate R150

Each supply is decoupled on this board using 10µF tantalum and 100nF multilayer ceramic capacitors.

Table 2. Standalone Power Supplies

OPTIONAL POWER SUPPLY—LINK CONFIGURATIONS
The board currently uses a single power supply for an analog front end (AFE) amplifiers (AD8629) and a bias-up circuit amplifier (ADA4807-1). For applications that support dual power supplies, you can follow either option to optimize performance.

Option 1
To easily evaluate a dual-supply option, the ADA4807 is capable of evaluating a dual-supply board design by completing the following steps:

1. Remove Resistors R149 and R151
2. Connect Resistor R81
3. Connect a negative 5V supply at the XNEG test point

Option 2
Currently, the board uses the MAX17291 and ADP7118 for a single supply option for the power tree.
However, the board has a readily available footprint for LTC3265. This is to evaluate a dual-supply power tree. Thus, take the following steps:

1. Remove R144, R149, R79, and R151
2. Connect resistors R81, R142, R128, R154, and R155

LINK CONFIGURATION OPTIONS
Multiple link options must be set correctly to select the appropriate operating setup before using the EVAL-AD7091R-8ARDZ.
The functions of these options are detailed in Table 3.
SETUP CONDITIONS
Ensure that all link positions are set as required by the selected operating mode before applying power and signals to the evaluation board. Table 3 shows the default positions of the links when the EVAL-AD7091R-8ARDZ is packaged.

Table 3. Setup Conditions

1. An SMD resistor is a surface-mount device resistor.
2. For external supplies. Please refer to the Standalone Mode section.
3. For the optional LDO regulators, remove R118 before connecting either R136 and R116 or R137 and R117.

CONNECTORS AND SOCKETS
The connectors and sockets on the EVAL-AD7091R-8ARDZ are outlined in Table 4.
The default interface is via the Arduino headers that connect the EVAL-AD7091R-8ARDZ evaluation board.

Table 4. On Board Connections

FUNCTIONAL BLOCK DIAGRAM

ORDERING INFORMATION

NOTES

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 (i) rent, lease, display, sell, transfer, assign, sublicense, or distribute the Evaluation Board; and (ii) 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 NONINFRINGEMENT 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. All Analog Devices products contained herein are subject to release and availability.

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Documents / Resources

ANALOG DEVICES UG-2324 Evaluation Board [pdf] User Manual EVAL-AD7091R-8ARDZ, EVAL-SDP-CK1Z, UG-2324 Evaluation Board, UG-2324, Evaluation Board, Board

References

• User Manual