Analog Devices EVAL-ADA4570SDZ User manual

User Guide | EVAL-ADA4570
UG-2004
Integrated AMR Angle Sensor and Signal Conditioner with Differential Outputs
PLEASE SEE THE LAST PAGE FOR AN IMPORTANT
WARNING AND LEGAL TERMS AND CONDITIONS. Rev. 0 | 1 of 17
FEATURES
►Full featured evaluation board for the ADA4570
►PC control in conjunction with the System Demonstration Plat-
form (SDP) (EVAL-SDP-CS1Z, SDP-S or EVAL-SDP-CB1Z,
SDP-B)
►PC software for data measurement and display
EVALUATION KIT CONTENTS
►EVAL-ADA4570SDZ evaluation board
►ADA4570 magnet stimulus
►Dipole magnet
►Hand movable mounting
ADDITIONAL HARDWARE REQUIRED
►The SDP-S or the SDP-B controller board with a USB cable
ADDITIONAL SOFTWARE REQUIRED
►EVAL-ADA4570SDZ Software Installer
GENERAL DESCRIPTION
The ADA4570 is an anisotropic magnetoresistive (AMR) sensor
with integrated signal conditioning amplifiers and analog-to-digital
converter (ADC) drivers. The ADA4570 produces two differential
analog output pairs that indicate the angular position of the sur-
rounding magnetic field.
The EVAL-ADA4570SDZ evaluation board features the ADA4570 in
an end of shaft magnet configuration.
The evaluation kit is composed of the EVAL-ADA4570SDZ and
a magnetic stimulus on a printed circuit board (PCB) mount. To in-
terface to a computer, the EVAL-SDP-CS1Z (SDP-S) or the EVAL-
SDP-CB1Z (SDP-B) is required which must be ordered separately.
An illustration of the ADA4570 evaluation system consisting of
the PC graphic user interface (GUI), the SDP, and the EVAL-
ADA4570SDZ is shown in Figure 1. In this user guide, SDP refers
to either the SDP-S or the SDP-B interface card.
The EVAL-ADA4570SDZ allows a detailed evaluation of the
ADA4570 where the software GUI demonstrates angular measure-
ment and performs system level calibration.
The EVAL-ADA4570SDZ also provides access via a standard
header for power and digital signals to the on-board ADC interface
(AD7266), which allows evaluation of the ADA4570 with a user
preferred microcontroller platform and to start the system software
development. Users can also access the analog output signals
of the ADA4570 to a user preferred ADC with a microcontroller
platform.
The PCB is designed so that the sensor board can be detached
from the SDP interface to provide a smaller form factor. Power
supplies can be sourced from either the USB port via the SDP card
or an external bench supply.
For full details, see the ADA4570 data sheet, which must be
used in conjunction with this user guide when using the EVAL-
ADA4570SDZ.
ADA4570 END OF SHAFT MAGNETIC EVALUATION SYSTEM
Figure 1. ADA4570 End of Shaft Magnetic Evaluation System Consisting of the PC GUI, the SDP, and the EVAL-ADA4570SDZ

User Guide EVAL-ADA4570
TABLE OF CONTENTS
analog.com Rev. 0 | 2 of 17
Features................................................................ 1
Evaluation Kit Contents......................................... 1
Additional Hardware Required...............................1
Additional Software Required................................ 1
General Description...............................................1
ADA4570 End of Shaft Magnetic Evaluation
System.................................................................1
Getting Started...................................................... 3
Quick Start Steps............................................... 3
Evaluation Board Hardware...................................4
Configuration of the EVAL-ADA4570SDZ.......... 4
Evaluation Board Quick Start ............................... 6
Software Installation Procedures........................6
Evaluation Board Software.................................... 8
Starting the Evaluation GUI................................8
Overview of the Main ADA4570 Evaluation
Software GUI Window......................................9
Evaluation Board Schematics and Silkscreen..... 13
Ordering Information ...........................................16
Evaluation Board Bill of Materials.....................16
Notes................................................................17
REVISION HISTORY
7/2021—Revision 0: Initial Version

User Guide EVAL-ADA4570
GETTING STARTED
analog.com Rev. 0 | 3 of 17
QUICK START STEPS
The SDP is the controller board, which is the communication link
between the PC and the EVAL-ADA4570SDZ, and provides the
serial peripheral interface (SPI) required to transfer ADA4570 data
sampled by the ADC directly to the host PC.
Note that the evaluation software and the SDP USB driver must be
installed before connecting the EVAL-ADA4570SDZ board and the
SDP board to the USB port of the PC to ensure that the evaluation
system is correctly recognized when the EVAL-ADA4570SDZ is
connected.
The SDP USB Driver Installer can be found by following the Soft-
ware tab on the EVAL-SDP-CS1Z (SDP-S) or the EVAL-SDP-CB1Z
(SDP-B) product pages.
To begin using the EVAL-ADA4570SDZ, take the following steps:
1. Connect the SDP board to the EVAL-ADA4570SDZ (see
Figure 2).
2. Slide the EVAL-ADA4570SDZ into the magnet mounting brack-
et at the bottom PCB mount side rail. To correctly align
the magnet with the ADA4570 sensor, ensure that the EVAL-
ADA4570SDZ is fully inserted into the magnet PCB mount.
3. Connect the SDP board to the computer using the supplied
USB cable (USB Type A to Mini-B).
4. To launch the EVAL-ADA4570SDZ software, click the Win-
dows® key to open the Windows Start menu and Programs list.
Navigate to Analog Devices and click EVAL-ADA4570SDZ.
Figure 2. Hardware Configuration Showing the Demonstration Magnet Assembly, EVAL-ADA4570SDZ, and the SDP-B

User Guide EVAL-ADA4570
EVALUATION BOARD HARDWARE
analog.com Rev. 0 | 4 of 17
The EVAL-ADA4570SDZ end of shaft evaluation system comprises
a PCB with the ADA4570, an AD7266 ADC, and an external
mountable magnetic stimulus.
CONFIGURATION OF THE EVAL-ADA4570SDZ
The EVAL-ADA4570SDZ was designed to provide flexibility for
users. The following configurations are available:
►SDP and Analog Devices, Inc, software controlled
►Using an external digital interface
►A direct analog interface with the ADA4570 sensor
If an external power supply is connected to supply the EVAL-
ADA4570SDZ, the current limitation of the external power supply
must be set to 100 mA as a precaution.
SDP and Analog Devices Software Controlled
The ADA4570 evaluation system can be powered directly from
the host PC USB by the SDP controller board via the P3 connec-
tor. Use the CON A connector of the SDP controller board to
connect to P3 (see SDP and Analog Devices Software Controlled).
The Connector P3 pinout with the used SDP connections for the
EVAL-ADA4570SDZ is listed in Table 1, which is the recommended
configuration for the user to quickly achieve high performance
measurement.
This configuration uses the SDP to communicate with the AD7266
ADC to sample the sensor output and display the data with the
software provided.
Figure 3. Connector P3 to Interface SDP and EVAL-ADA4570SDZ
Table 1. P3 Socket for the SDP Interface
Pin Number Function Description
3, 4, 6, 11, 23, 28, 36, 40, 46, 52, 58, 63, 69, 75, 81, 86, 93, 98, 104,
109, 115, 117, 118
GND System ground
5 5 V supply 5 V supply from the USB port of the connected PC
43 REF_SESECT Reference voltage select
44 RANGE Input range select
45 SGL/DIFF Differential and single-ended select
56 EEPROM_A0 Address A0 of the board identifier EEPROM
76 GPIO5 SDP general-purpose input and output (GPIO)
77 GPIO3 SDP GPIO
78 GPIO1 SDP GPIO
79 I2C SCL I2C clock
80 I2C SDA I2C data
82 SPI SCL SPI clock
83 SPI SDO SPI slave data out
84 SPI SDI SPI slave data in
85 SPI SPI chip select for the GPIO expander, SDP Chip Select A
116 3.3 V supply Main supply for supporting devices

User Guide EVAL-ADA4570
EVALUATION BOARD HARDWARE
analog.com Rev. 0 | 5 of 17
Using an External Digital Interface
The EVAL-ADA4570SDZ facilitates a configuration option where
the user can connect an external microcontroller or field program-
mable gate array (FPGA) to the on-board AD7266 ADC (see
Figure 4).
Figure 4. Typical Connection Diagram for Using the Digital Interface
Connector P2, shown in Figure 4, provides the required connectivity
to power the AD7266 ADC and the ADA4570 as well as the
interface to the AD7266 ADC. This configuration allows users to
monitor the digitized output of the ADA4570 with a user preferred
embedded hardware platform. The pinout of Connector P2 is listed
in Table 2. The SDP controller board supports a maximum SPI
speed of 10 MHz, which limits the sampling rate of the AD7266
ADC to 625 kSPS. This configuration can be used to facilitate data
acquisition with a faster sampling rate up to 2 MSPS.
Figure 5. Connector P2 for Access to the SPI of the ADC of the EVAL-
ADA4570SDZ
Table 2. Optional Digital Interface Connection of P2
Pin Name Input Type Description
VDD Supply The 5 V input that supplies the evaluation
board.
OUT1, OUT2,
CLK, CS
Digital inputs and
outputs
SPI.
VIO Supply and digital
input for
REF_SELECT of
the AD7266
When used in this configuration, VIO
selects the AD7266 ADC reference
source. If high, it is the external ADC
reference, and if low it is the internal 2.5 V
reference.
A0, A1, A2 Digital inputs Digital inputs to control the input channel
of the ADC. The Ax pins can control which
output configuration is sampled by the on-
board ADC.
GND Ground Ground connection of the EVAL-
ADA4570SDZ.
For full details about the SPI and how to interface the different pins,
refer to the EVAL-ADA4570SDZ schematics (see Figure 27 and
Figure 28) and the AD7266 data sheet.
Direct Analog Interface with the ADA4570
The EVAL-ADA4570SDZ facilitates a configuration option where
the user can connect an external ADC to the ADA4570 output
signals (see Figure 6).
Figure 6. Typical Connection Diagram for Using Direct Access to the
ADA4570 Sensor
Connector P1, shown in Figure 7, provides the required connectivity
to supply the ADA4570 and access to the ADA4570 output signals
for the external ADC. This configuration allows users to sample
the sine and cosine outputs of the ADA4570 with a user preferred
differential ADC. The pinout of Connector P1 is listed in Table 3.
Figure 7. Connector P1 for Direct Access to the Sensor Output
Table 3. Optional Analog Interface Connection of P1
Pin Name Input Type Description
VDD Supply 5 V supply of the EVAL-ADA4570SDZ
VSIN− Analog output Negative analog sine output from the
ADA4570
VSIN+ Analog output Positive analog sine output from the
ADA4570
VCOS− Analog output Negative analog cosine output from the
ADA4570
VCOS+ Analog output Positive analog cosine output from the
ADA4570
VTEMP Analog output Analog output from the ADA4570
NC Ground No connect pin
GND Ground Ground connection of the EVAL-
ADA4570SDZ
For full details about the ADA4570 sensor interface and how to
connect the device, refer to the EVAL-ADA4570SDZ schematics
(see Figure 27 and Figure 28) and the ADA4570 data sheet.

User Guide EVAL-ADA4570
EVALUATION BOARD QUICK START
analog.com Rev. 0 | 6 of 17
The EVAL-ADA4570SDZ evaluation board can be controlled with
the EVAL-ADA4570SDZ Evaluation Board Software. The following
sections provide instructions for installing the supporting software
and an overview for connecting the hardware to the PC.
SOFTWARE INSTALLATION PROCEDURES
Installing the EVAL-ADA4570SDZ Evaluation
Software
To install the EVAL-ADA4570SDZ evaluation software, take to the
following steps:
1. Start the Windows operating system of the PC and download
the ADA4570 Evaluation Board Installer software.
2. Unzip the downloaded file. Run the setup.exe file.
3. Click the setup.exe file to begin installing the evaluation soft-
ware. The software installation window opens as shown in
Figure 8.
Figure 8. EVAL-ADA4570SDZ Evaluation Software Install Window
4. Choose the installation directory and click Next. The default
location is C:\Program Files (x86)\Analog Devices\.
Figure 9. Destination Directory Window
5. Installing the EVAL-ADA4570SDZ Evaluation Software re-
quires users to accept the license agreement shown in
Figure 10. Read the agreement before clicking Next to proceed.
Figure 10. License Agreement Window
6. The window shown in Figure 11 provides a summary of the
software installation. Click Next to install the software listed in
the window.
Figure 11. Start Installation Window
7. A pop-up window then opens and displays a bar showing the
installation progress, as shown in Figure 12.
Figure 12. Overall Progress
The installation then completes, and the next step is to install the
SDP drivers.

User Guide EVAL-ADA4570
EVALUATION BOARD QUICK START
analog.com Rev. 0 | 7 of 17
SDP Installation
To install the SDP drivers, download the SDPDrivers.exe file from
the SDP product page (SDP-S or SDP-B) and complete the follow-
ing steps:
1. To initialize the installation, run the SDPDrivers.exe executable
file.
2. When the SDP drivers setup wizard appears, click Next (see
Figure 13).
Figure 13. SDP Driver Setup Wizard
3. When the Choose Install Location window appears (see
Figure 14), click Install. To select a different destination folder,
click Browse, select a destination, then click Install.
Figure 14. Choose Install Location Window
4. Click Finish to complete the installation of the SDP drivers.
5. When plugging in the SDP controller board via the provided
USB cable, allow the Found New Hardware Wizard to run.
Check that the SDP drivers are installed and that the SDP
controller board are connected properly by checking the Device
Manager of the PC. If the drivers and board are connected
properly, the Analog Devices System Demonstration Plat-
form SDP appears under ADI Development Tools
(see Figure 15).
Figure 15. Device Manager Menu
6. The computer now recognizes the SDP controller board, and
the EVAL-ADA4570SDZ Evaluation Software can be opened.
Uninstalling the Software
To uninstall the EVAL-ADA4570SDZ Evaluation Software, take the
following steps:
1. Launch the Uninstall Wizard by navigating to Start > Control
Panel > Programs and Features > EVAL-ADA4570SDZ to
open a window with the Uninstall button.
2. Click Uninstall.
3. Click Yes in the confirmation window that appears.
To uninstall the SDP drivers, adhere to the following steps:
1. Launch the Uninstall Wizard by navigating to Start > Control
Panel > Programs and Features > ADI SDP Drivers to open
a window with the Uninstall button.
2. Click Uninstall.
3. Click Yes in the confirmation window that appears.

User Guide EVAL-ADA4570
EVALUATION BOARD SOFTWARE
analog.com Rev. 0 | 8 of 17
STARTING THE EVALUATION GUI
To use the EVAL-ADA4570SDZ with the SDP controller board, start
by connecting the two boards together with the CON A connector of
the SDP.
When launching the GUI, the SDP controller board must be
recognized by the GUI before proceeding. The GUI automatically
searches for the SDP controller board and tries to read the EE-
PROM identification of the EVAL-ADA4570SDZ and to ensure that
the correct program is in use.
If the SDP controller board is not connected, or if the drivers are not
installed correctly, a Hardware Select window appears (see
Figure 16). If this occurs, ensure that the drivers are installed
correctly and that the PC recognizes the SDP controller board. Figure 16. Hardware Select Window
The Hardware Select window also appears when the EVAL-
ADA4570SDZ is not recognized or is not connected to the SDP
controller board. When the EVAL-ADA4570SDZ is detected, the
board appears preselected in the Hardware Select window. Click
Select to continue.

User Guide EVAL-ADA4570
EVALUATION BOARD SOFTWARE
analog.com Rev. 0 | 9 of 17
OVERVIEW OF THE MAIN ADA4570
EVALUATION SOFTWARE GUI WINDOW
Figure 17 shows the main EVAL-ADA4570SDZ GUI window when
starting the ADA4570 Evaluation Board Software.
Initially, all plots are blank, and the data capture is preset for data
acquisition of the differential VSIN and VCOS signals data capture.
Click Start to begin the data acquisition, and the Captured Data
window of the GUI displays the selected signals.
Figure 17. ADA4570 Evaluation Board Software (EVAL-ADA4570SDZ) Main Window

User Guide EVAL-ADA4570
EVALUATION BOARD SOFTWARE
analog.com Rev. 0 | 10 of 17
VSIN and VCOS Raw Outputs
The Captured Data graph shows measurement result in volts of
the selected outputs from the ADA4570 magnetic angle sensor (see
Figure 18).
Figure 18. Captured Data Graph
The red and blue waveforms in Figure 18 indicate the differential
signals of the selected VSIN channel and VCOS channel outputs
as the magnet rotates over the ADA4570. The VSIN and VCOS
differential signals output data is used to calculate the angle and
radius.
In the application, it is important that these two channels are
simultaneously sampled to avoid the introduction of errors resulting
in a phase delay between the sampling of the individual channels.
GUI Settings and Capture Modes
The GUI allows the user to change some settings that are accessed
via the system icon, Configure (see Figure 19).
Figure 19. Configure Icon
When the Configure icon is activated, the GUI opens a window
that allows the user to modify the captured data display settings,
data accusation and update rate settings, and the method the data
is captured. Figure 20 shows the GUI default settings.
Figure 20. Configure Window
The GUI provides two capture modes, Continuous and Burst.
When the EVAL-ADA4570SDZ operates in continuous capture
mode, the GUI constantly samples the VSIN channel and VCOS
channel. The number of samples displayed is set with the Chart
Length field and, by default, is set to 500 samples. The GUI
allows the user to set delays between sample reads via the Time
Between Bursts (s) field. The default delay is set to 10 ms.
After every sample read by the GUI, the Captured Data graph, the
angle, the radius, and the temperature values are updated.
When the EVAL-ADA4570SDZ operates in burst read mode, the
GUI samples a burst of samples, defined in the Samples to
Capture field, without updating the display. After the burst read has
finished, the GUI updates the display values with the collected data.
By default, the sampling frequency is set to 100,000 SPS.