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EVAL-AD765x-1SDZ User Guide

UG-417

One Technology Way • P. O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.com

Evaluating the AD7656-1/AD7657-1/AD7658-1, 250 kSPS, 6-Channel,

Simultaneous Sampling, Bipolar 16-/14-/12-Bit ADCs

PLEASE SEE THE LAST PAGE FOR AN IMPORTANT

WARNING AND LEGAL TERMS AND CONDITIONS.

Rev. 0 | Page 1 of 24

FEATURES

Full featured evaluation board for the AD7656-1/AD7657-1/

AD7658-1

PC control in conjunction with the system demonstration

platform (EVAL-SDP-CB1Z)

PC software for control and data analysis (time and

frequency domain)

Standalone capability

EVALUATION KIT CONTENTS

EVAL-AD7656-1SDZ, EVAL-AD7657-1SDZ, or

EVAL-AD7658-1SDZ evaluation board

Evaluation software CD for the AD7656-1/AD7657-1/

AD7658-1

9 V mains power supply adapter

ADDITIONAL EQUIPMENT NEEDED

EVAL-SDP-CB1Z system demonstration platform, includes a

USB cable

Precision analog signal source

SMB cables

PC running Windows XP SP2, Windows Vista, or Windows 7

with USB 2.0 port

ONLINE RESOURCES

Documents

AD7656-1/AD7657-1/AD7658-1 data sheet

EVAL-AD7656-1SDZ/EVAL-AD7657-1SDZ/

EVAL-AD7658-1SDZ user guide

Required Software

EVAL-AD7656-1SDZ/EVAL-AD7657-1SDZ/

EVAL-AD7658-1SDZ evaluation software

GENERAL DESCRIPTION

The EVAL -AD7656-1SDZ/EVAL -AD7657-1SDZ/EVAL -AD7658-

1SDZ are full featured evaluation boards that can be used to easily

evaluate all features of the AD7656-1/AD7657-1/AD7658-1. The

AD7656-1/AD7657-1/AD7658-1 are 16-/14-/12-bit, 6-channel,

250 kSPS simultaneous sampling ADCs, respectively. Each part

contains six 16-, 14-, or 12-bit, low power SAR ADCs and can

operate from a single 4.75 V to 5.25 V power supply or dual

±12 V power supplies. The parts feature throughput rates of up

to 250 kSPS.

The evaluation boards can be controlled via the system demon-

stration platform (SDP). The EVAL-SDP-CB1Z board allows

the evaluation boards to be controlled via the USB port of a PC

using the AD7656-1/AD7657-1/AD7658-1 evaluation software.

The E VA L -AD7656-1SDZ/EVA L -AD7657-1SDZ/E VA L -

AD7658-1SDZ generates all required power supplies on board and

supplies power to the E VA L -SDP-CB1Z controller board.

On-board components include the following:

AD8597: ultralow distortion, ultralow noise op amp (single)

AD8031: 2.7 V, 800 µA, 80 MHz rail-to-rail I/O single amplifier

ADP1613: step-up PWM dc-to-dc switching converter

ADP3303-5: high accuracy anyCAP® 200 mA low dropout

linear regulator

ADP2301: 1.2 A, 20 V, 1.4 MHz nonsynchronous step-down

switching regulator

ADM1185: quad voltage monitor and sequencer

ADP190: logic controlled, high-side power switch

ADG3308: low voltage, 1.15 V to 5.5 V, 8-channel bidirectional

logic level translator

ADR431: ultralow noise XFET® voltage reference with current

sink and source capability

AD780: 2.5 V/3.0 V ultrahigh precision band gap voltage reference

A functional block diagram is shown in Figure 1, and various link

options are described in the Link Configuration Options section.

For full details on the AD7656-1/AD7657-1/AD7658-1, see the

AD7656-1/AD7657-1/AD7658-1 data sheet, which should be

consulted in conjunction with this user guide when using these

evaluation boards.

Summary of content (24 pages)

PAGE 1
EVAL-AD765x-1SDZ User Guide UG-417 One Technology Way • P.O. Box 9106 • Norwood, MA 02062-9106, U.S.A. • Tel: 781.329.4700 • Fax: 781.461.3113 • www.analog.
PAGE 2
UG-417 EVAL-AD765x-1SDZ User Guide TABLE OF CONTENTS Features .............................................................................................. 1 Analog Inputs.............................................................................. 14 Evaluation Kit Contents ................................................................... 1 Reference Options ...................................................................... 14 Additional Equipment Needed ......................................
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EVAL-AD765x-1SDZ User Guide UG-417 FUNCTIONAL BLOCK DIAGRAM AVCC AGND DGND ON-BOARD POWER SUPPLIES AM1185 POWER SEQUENCER DVCC ADP1613 VSS ADP2301 OP AMP SUPPLIES + VIN – 7V TO 9V DC INPUT JACK SDP +5V 5V ADP3303 ADP190 3.3VIO (×2) +5V +3.
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UG-417 EVAL-AD765x-1SDZ User Guide GETTING STARTED evaluation board kit to ensure that the boards are connected firmly together. QUICK START STEPS To begin using the evaluation board, do the following: 2. With the EVAL-SDP-CB1Z board disconnected from the USB port of the PC, install the AD7656-1/AD7657-1/ AD7658-1 evaluation board software from the CD included in the evaluation board kit. The PC must be restarted after the software installation is complete.
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EVAL-AD765x-1SDZ User Guide UG-417 SOFTWARE INSTALLATION PROCEDURES 4. Select the location to install the software, and then click Next. The EVAL-AD7656-1SDZ/EVAL-AD7657-1SDZ/EVALAD7658-1SDZ evaluation kit includes a CD containing software to be installed on your PC before you begin using the evaluation board.
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UG-417 6. EVAL-AD765x-1SDZ User Guide Installing the EVAL-SDP-CB1Z System Demonstration Platform Board Drivers A summary of the installation is displayed. Click Next to continue. After the installation of the evaluation board software is complete, a welcome window is displayed for the installation of the EVALSDP-CB1Z system demonstration platform board drivers.
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EVAL-AD765x-1SDZ User Guide Click Install to confirm that you would like to install the drivers. 5. Before using the evaluation board, you must restart your computer. A dialog box opens, giving you the following options: Restart, Shut Down, Restart Later. Click the appropriate button. Figure 10. EVAL-SDP-CB1Z Drivers Setup: Granting Permission to Install Drivers Figure 12.
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UG-417 EVAL-AD765x-1SDZ User Guide EVALUATION BOARD SETUP PROCEDURES Configuring the Evaluation and SDP Boards The AD7656-1/AD7657-1/AD7658-1 evaluation board connects to the EVAL-SDP-CB1Z system demonstration board. The EVAL-SDP-CB1Z board is the controller board, which is the communication link between the PC and the main evaluation board. Figure 2 shows a photograph of the connections made between the AD7656-1/AD7657-1/AD7658-1 daughter board and the EVAL-SDP-CB1Z board. 1. 2.
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EVAL-AD765x-1SDZ User Guide UG-417 EVALUATION BOARD HARDWARE POWER SUPPLIES AD7656-1/AD7657-1/AD7658-1 DEVICE DESCRIPTION The AD7656-1/AD7657-1/AD7658-1 are reduced decoupling pin- and software-compatible versions of the AD7656/AD7657/ AD7658. Each AD7656-1/AD7657-1/AD7658-1 device contains six 16-/14-/12-bit, fast, low power successive approximation ADCs in a package designed on the iCMOS® process (industrial CMOS).
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UG-417 EVAL-AD765x-1SDZ User Guide LINK CONFIGURATION OPTIONS There are multiple jumper (LKx) and solder link (SLx) options that must be set correctly to select the appropriate operating setup before you begin using the evaluation board. The functions of these options are outlined in Table 2. SETUP CONDITIONS Care should be taken before applying power and signals to the evaluation board to ensure that all link positions are as required by the operating mode.
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EVAL-AD765x-1SDZ User Guide Link No. LK15 LK16 LK17 LK18 LK19 LK20 LK21 LK22 LK23 LK24 LK25 LK26 LK27 LK28 LK29 UG-417 Function V4 input jumper. Inserted: the V4 input is shorted to GND. VDRIVE source signal selection. Position A: the VDRIVE signal is sourced from the on-board 3.3 V supply. (Requires the EVAL-SDP-CB1Z board to be connected.) Position B: the VDRIVE pin is connected to the J7-14 external socket. V5 input jumper. Inserted: the V5 input is shorted to GND. V6 input jumper.
PAGE 12
UG-417 Link No. LK33 LK34 EVAL-AD765x-1SDZ User Guide Function DB0/SEL A selection. Position A: data is sent to EVAL-SDP-CB1Z. Position B: the DB0/SEL A pin is connected to VDRIVE. Position C: the DB0/SEL A pin is connected to GND. CONVST B selection. Position A: the CONVST B pin is connected to the J7-9 external socket. Position B: the CONVST B pin is connected to EVAL-SDP-CB1Z.
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EVAL-AD765x-1SDZ User Guide UG-417 Table 3. Default Link Positions for Packaged EVAL-AD7656-1SDZ/EVAL-AD7657-1SDZ/EVAL-AD7658-1SDZ Link No. LK1 LK2 LK3 Position A A A Function Software input is selected. VREF is not buffered. The WR/REFEN/DIS pin is connected to EVAL-SDP-CB1Z.
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UG-417 EVAL-AD765x-1SDZ User Guide EVALUATION BOARD CIRCUITRY ANALOG INPUTS SOCKETS/CONNECTORS The V1 to V6 inputs allow a signal to be connected to the board via SMB connectors. Table 4. Socket/Connector Functions The analog inputs on the EVAL-AD7656-1SDZ/EVAL-AD76571SDZ/EVAL-AD7658-1SDZ are filtered and buffered by the AD8597 ultralow distortion, ultralow noise (single) op amps. Additional filtering is provided by an R-C filter directly before the AD7656-1/AD7657-1/AD7658-1 inputs.
PAGE 15
EVAL-AD765x-1SDZ User Guide UG-417 MODES OF OPERATION SDP CONTROLLED MODE The AD7656-1/AD7657-1/AD7658-1 uses a high speed parallel interface that allows sampling rates of up to 250 kSPS. For more information about the operation of the parallel interface, refer to the AD7656-1/AD7657-1/AD7658-1 data sheet. The AD7656-1/AD7657-1/AD7658-1 uses the parallel interface to transfer data to the EVAL-SDP-CB1Z.
PAGE 16
UG-417 EVAL-AD765x-1SDZ User Guide HOW TO USE THE SOFTWARE FOR EVALUATING THE AD7656-1/AD7657-1/AD7658-1 Launching the Software After completing the steps in the Software Installation Procedures and Evaluation Board Setup Procedures sections, set up the system for data capture as follows: 2. Allow the Found New Hardware Wizard to run after the EVAL-SDP-CB1Z board is plugged into your PC. (If you are using Windows XP, you may need to search for the EVAL-SDP-CB1Z drivers.
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EVAL-AD765x-1SDZ User Guide UG-417 1 9 2 8 3 11 10 7 4 5 12 6 NOTES 1. FOR DETAILS ABOUT THE AREAS HIGHLIGHTED IN RED, SEE THE OVERVIEW OF THE MAIN WINDOW SECTION. Figure 15. Evaluation Software Main Window Rev.
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UG-417 EVAL-AD765x-1SDZ User Guide OVERVIEW OF THE MAIN WINDOW Part Information Box (Section 2) The main window of the software is shown in Figure 15 and has the features described in this section. The Part Information box (labeled 2 in Figure 15) allows selecting the generic to be evaluated; choose AD7656-1, AD7657-1, or AD7658-1.
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EVAL-AD765x-1SDZ User Guide UG-417 Busy LED (Section 11) Channel Display Buttons (Section 12) The Busy LED (labeled 11 in Figure 15) indicates when a read from the EVAL-SDP-CB1Z board is in progress. Clicking the buttons in this area (labeled 12 in Figure 15) allows you to display multiple channel reads. (Note that for FFT analysis, you can select only one channel to be displayed.) Rev.
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UG-417 EVAL-AD765x-1SDZ User Guide GENERATING A WAVEFORM ANALYSIS REPORT Figure 18 illustrates the waveform capture tab for a 10 kHz sine wave input signal. The Waveform Analysis area (labeled 1 in Figure 18) reports the amplitudes recorded from the captured signal and the frequency of the signal tone. 10726-018 1 Figure 18. Waveform Tab Rev.
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EVAL-AD765x-1SDZ User Guide UG-417 GENERATING A HISTOGRAM OF THE ADC CODE DISTRIBUTION The Histogram tab can be used to perform ac testing or, more commonly, dc testing. This tab shows the ADC code distribution of the input and computes the mean and standard deviation, which are displayed as Mean and Transition Noise, respectively, in the Histogram Analysis area (labeled 1 in Figure 19).
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UG-417 EVAL-AD765x-1SDZ User Guide GENERATING A FAST FOURIER TRANSFORM OF AC CHARACTERISTICS 2. 3. Figure 20 shows the FFT tab. This feature tests the traditional ac characteristics of the converter and displays a fast Fourier transform (FFT) of the results. As in the histogram test, raw data is then captured and passed to the PC, which performs the FFT and displays the resulting SNR, THD, and SINAD. To perform an ac FFT test, The Spectrum Analysis box displays the results of the captured data.
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EVAL-AD765x-1SDZ User Guide UG-417 GENERATING A SUMMARY OF THE WAVEFORM, HISTOGRAM, AND FAST FOURIER TRANSFORM 10726-021 Figure 21 shows the Summary tab. The Summary tab captures all the display information and provides it in one panel with a synopsis of the information, including key performance parameters such as SNR and THD. Figure 21. Summary Tab Rev.
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UG-417 EVAL-AD765x-1SDZ User Guide RELATED LINKS Resource AD7656-1 AD7657-1 AD7658-1 AD8597 AD8031 ADP1613 ADP3303-5 ADP2301 ADM1185 ADP190 ADG3308 ADR431 AD780 EngineerZone Circuits from the Lab Description Product Page: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 16-Bit ADC Product Page: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 14-Bit ADC Product Page: 250 kSPS, 6-Channel, Simultaneous Sampling, Bipolar 12-Bit ADC Product Page: Ultralow Distortion, Ultralow Noise Op Amp (Single) Prod