AD463x-FMCZ no-OS Example Project

See projects/ad463x_fmcz (doxygen) for the Doxygen documentation.

The EVAL-AD4630-24FMCZ, EVAL-AD4030-24FMCZ, and EVAL-AD4630-16FMCZ evaluation boards enable quick and easy evaluation of the AD4X3X family of 24-bit and 16-bit precision successive approximation register (SAR) analog-to-digital converters (ADCs). The AD4630-24 and AD4630-16 are 2 MSPS per channel, low power, dual channel 24-bit or 16-bit SAR ADCs, while the AD4030-24 is a single channel 24-bit precision SAR ADC that supports a sampling rate of up to 2 MSPS. The evaluation boards demonstrate the performance of either the AD4630-24, AD4030-24, or AD4630-16 and provide a configurable analog front end (AFE) for a variety of system applications.

The evaluation boards are designed for use with a ZedBoard. The ZedBoard is used to control data capture and buffering. The evaluation board connects to the ZedBoard via a field-programmable gate array (FPGA) mezzanine card (FMC) low pin count (LPC) connector.

Note

The name AD463x is used as a generic identifier in the no-OS driver code; this driver supports multiple devices in the AD463x family including AD4630-24, AD4630-20, AD4630-16, AD4631-24, AD4631-20, AD4631-16, AD4632-24, AD4632-20, AD4632-16, AD4030, ADAQ4216, and ADAQ4224.

Applications

Automatic test equipment
Digital control loops
Medical instrumentation
Seismology
Semiconductor manufacturing
Scientific instrumentation

Hardware Specifications

Power Supply Requirements

The EVAL-AD4630-24FMCZ evaluation board derives its primary 12V power supply directly from the ZedBoard via the FMC connector. This 12V input is first converted to a 7.5V intermediate voltage by a switching regulator before being post-regulated to provide various required voltage rails. Moreover, the 12V is instrumental in generating negative rail voltages, such as the -3.3V needed for the buffers and drive amplifiers, ensuring precise operational amplifier functionality.

Power Supply	Function	Min. (V)	Max. (V)
+12V	12V primary supply via FMC connector	N/A	N/A
GND	Ground connection	N/A	N/A
+3.3V	3.3V for various digital logic	3.26	3.33
+1.8V	1.8V for the ADC	1.77	1.81
VIO	1.8V supply for the ADC digital I/O	1.77	1.81
+5.4V	5.4V for the ADC	5.34	5.46
REFIN	5V ADC reference input	4.95	5.05
VAMP+	Positive supply for the amplifiers	6.35	6.5
VAMP-	Negative supply for the amplifiers	-3.35	-3.28
VP1	7.5V at the input of the switcher	7.425	7.575
REF	5V at the ADC reference output	4.95	5.05
EN	1.8V enable signal for power supplies	1.75	1.85

No-OS Build Setup

Please see: No-OS Build Guide

No-OS Supported Examples

The initialization data used in the examples is taken out from: Project Common Data Path

The macros used in Common Data are defined in platform specific files found in: Project Platform Configuration Path

Basic Example

The basic example code demonstrates the initialization, configuration, and data acquisition for AD463x series ADCs. The process begins with the basic_example_main function, which initializes the ADC using ad463x_init. If the ADAQ4224 is used, gain settings are configured via a scale table with ad463x_set_pgia_gain. The function then exits the register configuration mode using ad463x_exit_reg_cfg_mode. ADC data is read into a buffer with ad463x_read_data and sign-extended with no_os_sign_extend32. Finally, data for two channels is printed to the console, providing a clear demonstration of ADC data handling. This example includes error management and cleanup operations for robust execution.

In order to build the basic example, make sure you have the following configuration in the Makefile:

# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = y
IIO_EXAMPLE = n

IIO Example

The IIO example code for the ad463x_fmcz project demonstrates the use of the Industrial I/O framework to interface with AD463x series ADCs. It focuses on initializing the ADC device and setting up the IIO interface through the iio_example_main() function. This involves allocating and initializing an ad463x_dev structure, alongside an iio_ad463x structure to support IIO functions. The example routinely streams data from the ADC, handling it via an IIO-configured buffer, showcasing ADC configuration and data management capabilities using the IIO framework. It provides a practical implementation of IIO for enhanced device interfacing, forming a key part of hardware-software integration within the project.

If you are not familiar with ADI IIO Application, please take a look at: IIO No-OS

In order to build the IIO project, make sure you have the following configuration in the Makefile:

# Select the example you want to enable by choosing y for enabling and n for disabling
BASIC_EXAMPLE = n
IIO_EXAMPLE = y

No-OS Supported Platforms

Xilinx Platform

Used Hardware

Connections

EVAL-AD4630-24FMCZ to ZedBoard

Connect the EVAL-AD4630-24FMCZ to the ZedBoard through the FMC LPC connector for data and 12V power supply.
Connect differential signal sources to the input channels via the SMA connectors.
Set the VADJ SELECT jumper to the correct voltage (e.g., 2.5V) to avoid damage.
Optionally connect an external clock input (up to 100 MHz) via the CLK IN SMA connector.

ZedBoard

Configure the boot jumpers for SD card boot.
Connect a USB cable to the USB OTG port for communication.
Connect a power supply to J20/DC Input to power the system.
Verify the green power LED (LD1/3) is lit after powering up.

Build Command

cp <SOME_PATH>/system_top.xsa .
# to delete current build
make reset
# to build the project
make PLATFORM=xilinx
# to flash the code
make run
# to debug the code
make debug

STM32 Platform