AD7768-1 no-OS Example Project

Supported Evaluation Boards

Overview

The EV-AD7768-1FMCZ evaluation kit contains the AD7768-1, a 24-bit, 256 kSPS ADC, and connects to a PC via the EVAL-SDP-CH1Z motherboard through USB. It receives power at 5V and 3.3V, regulated by the EVAL-SDP-CH1Z for the ADC and its components. The software provided configures the ADC’s device registers and enables performance evaluation through time domain analysis tools, including waveform graphs and noise analysis. This setup allows detailed exploration of the ADC’s capabilities and is designed for professional electronic assessment and data collection.

Applications

  • Platform ADC to serve a superset of measurements and sensor types

    • Sound and vibration, acoustic, and material science research and development

    • Control and hardware in loop verification

    • Condition monitoring for predictive maintenance

    • Electrical test and measurement

    • Audio testing and current and voltage measurement

    • Clinical electroencephalogram (EEG), electromyogram (EMG), and electrocardiogram (ECG) vital signs monitoring

    • USB-, PXI-, and Ethernet-based modular DAQ

    • Channel to channel isolated modular DAQ designs

Hardware Specifications

Power Supply Requirements

To power the EV-AD7768-1FMCZ evaluation board internally, set the VINSEL jumper to Position B to derive power from the EVAL-SDP-CH1Z system demonstration platform, which provides the necessary 5V and 3.3V power. The board’s power system includes linear regulators (U8, U9, U10) for 5V and 7V, and components ADP1718 and ADP7118 for 3.3V and 10V regulation. AD840 and AD841 reference amplifiers stabilize operating conditions.

On-board Connectors

Connector Type

Connector Function

Description

SMB Connectors

AIN1+ and AIN1- Analog Inputs

Provides access to the main analog input channels.

Terminal Blocks

Additional Analog Inputs

Alternative access points for analog signals.

J4 Connector (EVAL-SDP-CH1Z)

System Demonstration Platform Connection

Connects to the system demonstration platform board.

P1 Socket

Primary Board Interface

Main connection socket for external connections.

No-OS Build Setup

Please see: https://wiki.analog.com/resources/no-os/build

No-OS Supported Examples

The initialization data used in the examples is taken out from the Project SRC Path .

Basic Example

The basic example demonstrates how to read data from the AD7768-1 ADC evaluation board using a Xilinx platform. The example relies on the AXI clock generator to synchronize the system clock at a specified frequency. Data can be read using either direct SPI commands or an offload mode for higher throughput, determined by compilation flags.

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

# Force select an example by assigning y for enabling.
BASIC_EXAMPLE = y

No-OS Supported Platforms

  • Xilinx

Xilinx Platform

Used Hardware

  • EV-AD77681FMCZ evaluation board

  • Zedboard

Connections

The EV-AD77681FMCZ evaluation board connects to a Zedboard via essential SPI and GPIO connections to facilitate communication and control. The SPI connections—comprising SPI_CLK (serial clock line), SPI_MISO (master input slave output), SPI_MOSI (master output slave input), and SPI_CS (chip select)—enable data exchange between the ADC and the Zedboard in SPI control mode.

Signal

Description

Zedboard Multipurpose Input/Output (MIO) Pins

EV-AD77681FMCZ Pin

SPI_CLK

Serial Clock Line

P16

P6

SPI_MISO

Master Input Slave Output

P17

P5

SPI_MOSI

Master Output Slave Input

P21

P4

SPI_CS

Chip Select

P1

P3

Build Command

# to delete current build
make reset PLATFORM=xilinx
        # to build the basic project
        make EXAMPLE=basic PLATFORM=xilinx
# to flash the code
make run