The most recent version of this page is a draft.
This version (03 Oct 2023 15:46) was approved by Paul Blanchard.The Previously approved version (29 Sep 2023 16:41) is available.
This version (03 Oct 2023 15:46) was approved by Paul Blanchard.The Previously approved version (29 Sep 2023 16:41) is available.This is an old revision of the document!
Table of Contents
CN0584 User Guide
CN0584 (Low Latency Development Kit) is a development platform consisting of two boards the EVAL-CN0585-FMCZ and the EVAL-CN0584-EBZ. EVAL-CN0585-FMCZ consists of 4 x 16-bit ADC channels and 4 x 16-bit DAC channels that are interfaced with an FPGA through the FMC Low Pin Count (LPC) Connector. Current revision of EVAL-CN0585-FMCZ is Rev B. EVAL-CN0584-EBZ is the application specific analog front end (AFE) board.CN0584 is connected to a Zedboard to build a development system setup like shown in Figure 7.
The Low Latency Development Kit (LLDK) provides a complete data acquisition and signal generation platform with on-board power rails, voltage monitoring, logic level translation, general purpose I/O, I2C, SPI, and a personality interface connector.
The key performance benefit of the LLDK system is the ability to perform a complete capture and conversion of precision analog input data in <70ns with the ADC module and generate a settled full-scale analog output in <200ns from initial data written to the DAC.
Figure 1. Low Latency Development Kit
Connections and Configurations
Figure 2. EVAL-CN0584-EBZ Board
Figure 3.Simplified Block Diagram of LLDK
ADC Inputs
There are four channels of differential input signals on EVAL-CN0584-EBZ.
| Channel | Positive Input Signal | Negative Input Signal |
|---|---|---|
| Channel 0 | J1 | J2 |
| Channel 1 | J3 | J4 |
| Channel 2 | J5 | J6 |
| Channel 3 | J7 | J8 |
Table 1. ADC Input Signal Connectors
ADC Input Range Configuration
LLDK has configurable input voltage ranges of ±10 V(Default), ±5 V, ±4.096 V, ±2.5 V, and ±1.5 V. The input range can be changed by modifying resistor placements on EVAL-CN0584-EBZ as described in Table 2.
| Channel | Input Voltage Range | AFE Board Modification |
|---|---|---|
| Channel 0 | ±10 V (default) | Include R19A, R21A, R22A, R24A; DNI R18A, R20A, R23A, R25A |
| ±5 V | Include R18A, R20A, R23A, R25A; DNI R19A, R21A, R22A, R24A | |
| ±4.096 V | Include R19A, R21A; DNI R18A, R20A, R22A, R23A, R24A, R25A | |
| ±2.5 V | Include R18A, R20A; DNI R19A, R21A, R22A, R23A, R24A, R25A | |
| ±1.5 V | Include R18A, R19A, R20A, R21A; DNI R22A, R23A, R24A, R25A | |
| Channel 1 | ±10 V (default) | Include R19B, R21B, R22B, R24B; DNI R18B, R20B, R23B, R25B |
| ±5 V | Include R18B, R20B, R23B, R25B; DNI R19B, R21B, R22B, R24B | |
| ±4.096 V | Include R19B, R21B; DNI R18B, R20B, R22B, R23B, R24B, R25B | |
| ±2.5 V | Include R18B, R20B; DNI R19B, R21B, R22B, R23B, R24B, R25B | |
| ±1.5 V | Include R18B, R19B, R20B, R21B; DNI R22B, R23B, R24B, R25B | |
| Channel 2 | ±10 V (default) | Include R19C, R21C, R22C, R24C; DNI R18C, R20C, R23C, R25C |
| ±5 V | Include R18C, R20C, R23C, R25C; DNI R19C, R21C, R22C, R24C | |
| ±4.096 V | Include R19C, R21C; DNI R18C, R20C, R22C, R23C, R24C, R25C | |
| ±2.5 V | Include R18C, R20C; DNI R19C, R21C, R22C, R23C, R24C, R25C | |
| ±1.5 V | Include R18C, R19C, R20C, R21C; DNI R22C, R23C, R24C, R25C | |
| Channel 3 | ±10 V (default) | Include R19D, R21D, R22D, R24D; DNI R18D, R20D, R23D, R25D |
| ±5 V | Include R18D, R20D, R23D, R25D; DNI R19D, R21D, R22D, R24D | |
| ±4.096 V | Include R19D, R21D; DNI R18D, R20D, R22D, R23D, R24D, R25D | |
| ±2.5 V | Include R18D, R20D; DNI R19D, R21D, R22D, R23D, R24D, R25D | |
| ±1.5 V | Include R18D, R19D, R20D, R21D; DNI R22D, R23D, R24D, R25D |
Table 2. ADC Input Voltage Range Selection by Resistor Connections
DAC Outputs
LLDK can support multiple output voltage ranges which can be configured, such as 0 to 2.5 V, 0 V to 5 V, −5 V to +5 V, and −10 V to +10 V, and custom intermediate ranges with full 16-bit resolution. In order to change the output range, resistor placements on the AFE board must be modified and register settings must be applied to AD3552R on EVAL-CN0585-FMCZ as described in Table 4.
| Channel | Output Signal |
|---|---|
| A | J9 |
| B | J10 |
| C | J11 |
| D | J12 |
Table 3. DAC Output Signal Connectors
| Channel | Output Span | VZS (V) | VFS (V) | AFE Board Modification | Register Setting |
|---|---|---|---|---|---|
| CH0 | +/- 10V (Default) | -10.382 | 10.380 | Include R9; DNI R10, R11 | CH0_CH1_OUTPUT_RANGE = 0x100 |
| +/- 5V | -5.165 | 5.166 | Include R11; DNI R9, R10 | CH0_CH1_OUTPUT_RANGE = 0x011 | |
| 10V | -0.165 | 10.163 | Include R11; DNI R9, R10 | CH0_CH1_OUTPUT_RANGE = 0x010 | |
| 5V | -0.078 | 5.077 | Include R10; DNI R9, R11 | CH0_CH1_OUTPUT_RANGE = 0x001 | |
| 2.5V | -0.198 | 2.701 | Include R10; DNI R9, R11 | CH0_CH1_OUTPUT_RANGE = 0x000 | |
| CH1 | +/- 10V (Default) | -10.382 | 10.380 | Include R12; DNI R13, R14 | CH0_CH1_OUTPUT_RANGE = 0x100 |
| +/- 5V | -5.165 | 5.166 | Include R13; DNI R12, R14 | CH0_CH1_OUTPUT_RANGE = 0x011 | |
| 10V | -0.165 | 10.163 | Include R13; DNI R12, R14 | CH0_CH1_OUTPUT_RANGE = 0x010 | |
| 5V | -0.078 | 5.077 | Include R14; DNI R12, R13 | CH0_CH1_OUTPUT_RANGE = 0x001 | |
| 2.5V | -0.198 | 2.701 | Include R14; DNI R12, R13 | CH0_CH1_OUTPUT_RANGE = 0x000 | |
| CH2 | +/- 10V (Default) | -10.382 | 10.380 | Include R15; DNI R16, R17 | CH2_CH3_OUTPUT_RANGE = 0x100 |
| +/- 5V | -5.165 | 5.166 | Include R16; DNI R15, R17 | CH2_CH3_OUTPUT_RANGE = 0x011 | |
| 10V | -0.165 | 10.163 | Include R16; DNI R15, R17 | CH2_CH3_OUTPUT_RANGE = 0x010 | |
| 5V | -0.078 | 5.077 | Include R17; DNI R15, R16 | CH2_CH3_OUTPUT_RANGE = 0x001 | |
| 2.5V | -0.198 | 2.701 | Include R17; DNI R15, R16 | CH2_CH3_OUTPUT_RANGE = 0x000 | |
| CH3 | +/- 10V (Default) | -10.382 | 10.380 | Include R18; DNI R19, R20 | CH2_CH3_OUTPUT_RANGE = 0x100 |
| +/- 5V | -5.165 | 5.166 | Include R19; DNI R18, R20 | CH2_CH3_OUTPUT_RANGE = 0x011 | |
| 10V | -0.165 | 10.163 | Include R19; DNI R18, R20 | CH2_CH3_OUTPUT_RANGE = 0x010 | |
| 5V | -0.078 | 5.077 | Include R20; DNI R18, R19 | CH2_CH3_OUTPUT_RANGE = 0x001 | |
| 2.5V | -0.198 | 2.701 | Include R20; DNI R18, R19 | CH2_CH3_OUTPUT_RANGE = 0x000 |
Table 4. DAC Output Voltage Range Selection by Resistor Connections and Register Settings
Voltage Reference
The default ADC reference configuration uses the internal 2.048 V, ±0.1% accurate, 20 ppm/°C max voltage reference. For more stringent use cases where the accuracy and temperature drift is an issue, an external LTC6655 2.048 V, ±0.025% accurate, 2 ppm/°C max voltage reference can be used.
The default DAC reference configuration uses the internal 2.5 V, ±0.3% accurate, 10 ppm/°C max voltage reference. For more stringent use cases where the accuracy and temperature drift is an issue, an external ADR4525 2.5 V, ±0.02% accurate, 2 ppm/°C max voltage reference can be used.
| VREF | Jumper Settings |
|---|---|
| ADC_VREF | Short P5 |
| DAC_VREF | Short P4 |
Table 5. Voltage Reference Settings
Power Supply Considerations and Configuration
All power for CN0584 is provided by EVAL-CN0585-FMCZ through the AFE connector. CN0584 uses the +15 V and -15 V rails to provide the positive and negative supply voltages for the ADG5421F input protection switches. The +12 V and -12 V rails provide the positive and negative supply voltages for the ADA4898-1 ADC buffer amplifiers. The +3.3 V rail powers the EEPROM circuit. Table 6 provides more details on LLDK power rails:
| Power Rail | Description |
|---|---|
| +12 V | LT3045-1 provides the 12V rail supplying up 280mA |
| -12 V | LT3094 provides the -12V rail supplying up to -280mA |
| +15 V | LTM8049 provides the +15V rail at 80% efficiency |
| -15 V | LTM8049 provides the -15V rail at 80% efficiency |
| +3.3 V | Fed through from the FPGA FMC connector to the AFE connector |
Table 6. Power Rail Descriptions
System Setup Using a ZedBoard
CN0584 is fully supported using a ZedBoard.
Figure 4. EVAL-CN0585-FMCZ connected to EVAL-CN0584-EBZ
The following is a list of items needed for system setup:
- Hardware
- ZedBoard Rev D or later board
- 12Vdc, 3A power supply
- 16GB (or larger) Class 10 (or faster) micro-SD card (included in the box)
- USB-C power source (included in the box)
- Micro-USB to Type-A cable
- Ethernet cable
- User interface setup (choose one):
- HDMI monitor, keyboard, and mouse plugged directly into the ZedBoard
- Host Windows/Linux/Mac computer on the same network as the ZedBoard
- Software
- Host PC (Windows or Linux)
- A UART terminal if need to access Linux system on the ZedBoard (Putty/Tera Term/Minicom, etc.), Baud rate 115200 (8N1)
Loading Image on SD Card
The box includes a pre-programmed SD card. You can skip the steps in this section and go to the Setting up the Hardware section if using this provided card.
To boot the ZedBoard and control the EVAL-CN0585-FMCZ, you will need to install ADI Kuiper Linux on an SD card. Complete instructions, including where to download the SD card image, how to write it to the SD card, and how to configure the system are provided on the Kuiper Linux page.
Configuring the SD Card
Follow the configuration procedure under Configuring the SD Card for FPGA Projects on the Kuiper Linux page. Copy the following files onto the boot directory to configure the SD card (download link sdcard_config_files.zip):
- uImage file for Zynq
- BOOT.BIN specific to your EVAL-CN0585-FMCZ + ZedBoard
- setup_adc.sh file for setting up ADC
- devicetree.dtb devicetree for Zynq specific to your EVAL-CN0585-FMCZ + ZedBoard.The device tree describes the following devices:
- one-bit-adc-dac – controls the MAX7301
- axi_pwm_gen – generates the CNV signal for analog-to-digital converters
- ref_clk – generates the sample clock for ADAQ23876 devices and the reference clock for AD3552R devices
- rx_dma – controls the DMA for RX path
- Ltc2387 – controls ADAQ23876 devices
- qspi0 – controls the SPI devices that are connected to the PL SPI IP
- dac0_tx_dma - controls the DMA for the first AD3552R device
- dac1_tx_dma - controls the DMA for the second AD3552R device
- axi_ad3552r_0 – controls the first AD3552R device
- axi_ad3552r_1 – controls the second AD3552R device
- I2c – controls devices that are connected to PL I2C IP (eeprom, eeprom2, ad7291_1)
Setting up the Hardware
You will need to:
- Get the ZedBoard.
- Insert the SD CARD into the SD Card Interface Connector (J12).
- Connect the EVAL-CN0585-FMCZ board into the ZedBoard FMC connector.
- Connect the EVAL-CN0584-EBZ board into the EVAL-CN0585-FMCZ.
- Connect micro USB to UART port (J14), and the other end to the host PC.
- Connect the ethernet cable to RJ45 ethernet connector (J11), and the other end to the host PC.
- Plug the Power Supply into the 12V Power ZedBoard input connector (J20) (DO NOT turn the device on).
- Plug USB-C power supply to EVAL-CN0585-FMCZ
- Set the jumpers as seen in Figure 5
Figure 5. ZedBoard Jumper Settings - Connect the DAC output connectors to the positive ADC input connectors as shown in Figure 6 using SMA cables. Terminate the negative ADC connectors with 50ohms terminators
Figure 6. EVAL-CN0584-EBZ Loopback Connection on AFE - Turn the ZedBoard on.
- Wait ~30 seconds for the “DONE” LED to turn blue. This is near the DISP1.The hardware set up is now complete.
Figure 7. Example System Setup
All the products described on this page include ESD (electrostatic discharge) sensitive devices. Electrostatic charges as high as 4000V readily accumulate on the human body or test equipment and can discharge without detection.
Although the boards feature ESD protection circuitry, permanent damage may occur on devices subjected to high-energy electrostatic discharges. Therefore, proper ESD precautions are recommended to avoid performance degradation or loss of functionality. This includes removing static charge on external equipment, cables, or antennas before connecting to the device.
Application Software (both locally and remotely on the FPGA)
The CN0584 can be interfaced with using IIO Oscilloscope, Python, or MATLAB to enable device configuration, capture of incoming samples from the ADCs, and generation of waveforms to be transmitted by the DACs.
Hardware Connection
Libiio is a library used for interfacing with IIO devices and must be installed on your computer to interface with the hardware.
Download and Install the latest Libiio package on your machine.
To connect to your device, the IIO Osciloscope software must be able to create a context. The context creation in the software depends on the backend used to connect to the device as well as the platform where the EVAL-CN0585-FMCZ is attached. The ZedBoard running ADI Kuiper Linux is currently the only platform supported for the CN0585.
The user needs to supply a URI (Uniform Resource Identifier) which will be used in the context creation. To get the URI, use the command iio_info in the terminal. The iio_info command is a part of the libIIO package that reports all IIO attributes.Upon installation, simply enter the command on the terminal command line to access it.
For FPGA(ZedBoard) Direct Local Access:
iio_info
For Windows machine connected to an FPGA(ZedBoard):
iio_info -u ip:<ip address of your ip>
Example:
- If your ZedBoard has the IP address 169.254.92.202, you have to use iio_info -u ip::169.254.92.202 as your URI
Do note that the Windows machine and the FPGA board should be connected to the same network for the machine to detect the device.
IIO Oscilloscope
IIO Oscilloscope is a cross platform GUI application which can interface with different evaluation boards from within a Linux system.
Make sure to download/update to the latest version of IIO-Oscilloscope found on this linkhttps://github.com/analogdevicesinc/iio-oscilloscope/releases
- 1- Once done with the installation or an update of the latest IIO-Oscilloscope, open the application. The user needs to supply a URI which will be used in the context creation of the IIO Oscilloscope. If there's only one platform is connected, the IIO Oscilloscope will find URI automatically; If more than one platforms are connected, the user needs to supply the specific URI. The instructions to obtain the URI can be found in the previous section.
- 2- Press refresh to display available IIO Devices and press connect.
Figure 8. IIO Oscilloscope Connection
- 3- After the board is connected, select the one-bit-adc-dac-device, which is the controller for the MAX7301ATL+ I/O Expander. Then configure pins values of output voltages 0 through 9, by setting the raw value to 1 . Press Write to confirm.
Figure 9. MAX7301ATL Output Channels Configuration
| one-bit-adc-dac device channel | Schematic PIN |
|---|---|
| Voltage0 | GPIO0_VIO |
| Voltage1 | GPIO1_VIO |
| Voltage2 | GPIO2_VIO |
| Voltage3 | GPIO3_VIO |
| Voltage4 | GPIO6_VIO |
| Voltage5 | GPIO7_VIO |
| Voltage6 | PAD_ADC0 |
| Voltage7 | PAD_ADC1 |
| Voltage8 | PAD_ADC2 |
| Voltage9 | PAD_ADC3 |
Table 7. Voltage Configuration for GPIO Pins
- 4- Select the desired input source for both AD3552R devices axi-ad3552r-0 and axi-ad3552r-1 as dma_input.
Figure 10. AD3552R Input Source Selection in IIO Oscilloscope
Even if the input source is set to adc_input or ramp_input the steps regarding the DAC Data Manager tab have to be followed.
- 5- Select the desired output range for both AD3552R devices.
Figure 11. AD3552R Output Range Selection in IIO Oscilloscope
Make sure you don't try to read/write the output_range attribute when the stream_status is in start_stream or start_stream_synced.
- 6- From the DAC Data Manager Window select the output channels of the DAC and enable the cyclic buffer for each DAC.
- 7- Load an example file (.mat, .txt, etc) from the IIO Oscilloscope installation directory, under Program Files/IIO Oscilloscope/lib/osc/waveforms folder.
If the source is set as dma_input and the data from all 4 channels needs to be synchronized make sure that you press the load button for the axi-ad3552r-1 device first then for axi-ad3552r-0.
Figure 12. DAC Data Manager with Example Waves on 4 Channels
- 8- Click on the load button.
If the source is set as dma_input and the data from all 4 channels needs to be synchronized make sure that you write the start_stream_synced for the axi-ad3552r-1 device first then for axi-ad3552r-0.
- 9- From the Debug window, select the stream_status IIO Attribute and start the stream (start_stream_synced means that all 4 channels are updated at the same time and the data streaming process waits for both DACs to be started).
Figure 13. DAC Stream Status Selection
If the source is set as dma_input and the data from all 4 channels needs to be synchronized make sure that you write the start_stream_synced for the
axi-ad3552r-1 device first then for axi-ad3552r-0.
- 10- After the stream_status has been written and 4 channels are enabled, hit play button. Then data capture window can be seen like in Figure 14.
Figure 14. Captured Loopback Signal
Note that there is a phase delay between voltage0/voltage2 and voltage1/voltage3 because the DAC device channels are updated consecutively See the DAC UPDATE MODES section in AD3552R
If you intend to stop the stream transmission and start it again synchronized set the stream_status IIO Attribute to stop_stream for axi-ad3552r-1 device first then for the axi-ad3552r-0 device.
PyADI-IIO
The CN0584 can be interfaced to Python using the PyADI-IIO. PyADI-IIO is a Python abstraction module to simplify interaction with IIO drivers on ADI hardware. This module provides device-specific APIs built on top of the current libIIO Python bindings. These interfaces try to match the driver naming as much as possible without the need to understand the complexities of libIIO and IIO.
Follow the step-by-step procedure on how to install, configure, and set up PyADI-IIO and install the necessary packages/modules needed by referring to PyADI-IIO.
Running the example
Github link for the Python sample script: CN0585 Python Example
After installing and configuring PYADI-IIO on your machine, you are now ready to run Python script examples. To follow this example, run the cn0585_fmcz_example.py found in the examples folder.
D:\pyadi-iio>export PYTHONPATH=D:/pyadi-iio/ D:\pyadi-iio>python examples/cn0585_fmcz_example.py ip:your_board_ip
Press enter and lines below will be observed:
$ python examples/cn0585_fmcz_example.py uri: ip:your_board_ip ############# EEPROM INFORMATION ############ read 256 bytes from /sys/devices/soc0/fpga-axi@0/41620000.i2c/i2c-1/1-0050/eeprom Date of Man : Fri Jan 20 08:11:00 2023 Manufacturer : Analog Devices Product Name : LLDK-LTC2387-AD3552R Serial Number : 56864654 Part Number : 1234 FRU File ID : 12131321 PCB Rev : VB PCB ID : HIL BOM Rev : VC Uses LVDS : Y ############################################# GPIO4_VIO state is: 0 GPIO5_VIO state is: 0 Voltage monitor values: Channel : temp0 : 49.25 Deg. C Channel : voltage0 : 2.26745605283 V Channel : voltage1 : 0.6274414057359999 V Channel : voltage2 : 2.061157224874 V Channel : voltage3 : 0.7531738275079999 V Channel : voltage4 : 2.092285154536 V Channel : voltage5 : 2.084960935792 V Channel : voltage6 : 2.2534179669039998 V Channel : voltage7 : 1.80969238133 V AXI4-Lite 0x108 register value: 0x2 AXI4-Lite 0x10c register value: 0xB Sample data min: 0 Sample data max: 65535 input_source:dac0: adc_input input_source:dac1: adc_input Maximum measured voltage 0 : 10.115187500000001 Maximum measured voltage 1 : 0.00103125 Maximum measured voltage 2 : 0.00034375000000000003 Maximum measured voltage 3 : 0.00103125 Minimum measured voltage 0: 10.107625 Minimum measured voltage 1: -0.00034375000000000003 Minimum measured voltage 2: -0.00103125 Minimum measured voltage 3: -0.00034375000000000003
The following window will pop up:
Figure 15: ADC Captured Data Python Plot
If you plan to transmit multiple cycles of synchronous stream, make sure the script starts/stops axi-ad3552r-1 first, then axi-ad3552r-0.
MATLAB and Simulink
Required MATLAB Add-Ons:
Github link for the Matlab sample script: CN0585StreamingTest.m
The steps described in the Analog Devices Transceiver Toolbox For MATLAB and Simulink page have to be followed to configure the Matlab/Simulink project using the MathWorks HDL Workflow Advisor.
Device Control and Data Streaming
Remote data streaming to and from hardware is made available through system object interfaces, which are unique for each component or platform. The hardware interfacing system objects provide a class to both configure a given platform and move data back and forth from the device. After running the CN0585StreamingTest.m example as described in Steps for MATLAB Configuration of CN0585, the window in Figure 16 will pop up:
Figure 16. ADC Captured Data Matlab Plot
If you plan to transmit multiple cycles of synchronous stream, make sure to start/stop axi-ad3552r-1 first, then axi-ad3552r-0.
Configuring Custom HDL Models Using Simulink
The ZedBoard that drives CN0585 is configured with a HDL reference design which is an embedded system built around a processor core either ARM, NIOS-II, or Microblaze. A functional block diagram of the system is shown in Figure 17.
Figure 17. HDL Reference Design
The device digital interface is handled by specific device cores axi_ad35552r for the DAC path and axi_ltc2387 for the ADC path. The cores are programmable through an AXI-lite interface. HDL IP(HDL_DUT) code to be integrated in this reference design is generated using High Speed Converter Toolbox. (https://github.com/analogdevicesinc/HighSpeedConverterToolbox/). High Speed Converter Toolbox supports the IP Core generation flow from MathWorks which allows for automated integration of DSP into HDL reference designs from Analog Devices. The workflow for generating HDL_DUT codes takes Simulink subsystems, runs HDL-Coder to generate source Verilog, and then integrates that into a larger reference design. HDL_DUT Code Generation Workflow is described in configuring_lldk.pdf. HDL_DUT with Configuration Registers (Accessed over AXI-Lite Interface) Code Generation Workflow for Transmit Configuration is described in configuring_lldk_axi_lite.pdf
Schematic, PCB Layout, Bill of Materials
EVAL-CN0584-EBZ Design & Integration Files
- Schematics
- PCB Layout
- Bill of Materials
- Allegro Project
Additional Information and Useful Links
Reference Demos & Software
/srv/wiki.analog.com/data/pages/resources/eval/user-guides/circuits-from-the-lab/cn0584.txt · Last modified: 05 Dec 2023 17:23 by Xiaomeng Gao