AD7124-4SDZ no-OS Example Project

See projects/ad7124-4sdz (doxygen) for the Doxygen documentation.

The EVAL-AD7124-4SDZ evaluation board is a platform for evaluating the AD7124-4, a low power, low noise, completely integrated analog front end for high precision measurement applications. The AD7124-4 provides 4 differential or 7 pseudo differential input channels, a 24-bit sigma-delta ADC, an on-chip 2.5 V reference, and internal oscillator. The device also integrates a programmable gain amplifier (PGA) and excitation current sources. The board supports diverse input configurations, suitable for high-precision measurements. It requires a 7V to 9V external power supply and offers connectors for power and analog signals, allowing users to connect sensors and conduct ADC diagnostics.

Applications

Temperature Measurement
Pressure Measurement
Industrial Process Control
Instrumentation
Smart Transmitters

Hardware Specifications

Power Supply Requirements

The EVAL-AD7124-4SDZ evaluation board requires an external power supply ranging from 7V to 9V. Power can be supplied via the J3 connector using a bench top supply or the J5 connector with a DC plug adapter.

Board Connector and Jumper Settings

On-board Connectors

Please see the following table for the connector descriptions:

Connector

Description

J3

Barrel jack (bench top) 7 V to 9 V input; LK2 Position A

J5

Barrel jack (wall wart) 7 V to 9 V input; LK2 Position B

J6

Analog input header for sensors/signals

J11

Additional analog input header

A0 / A1

SMA/SMB footprints for differential analog input channels

CLK IN

SMB/SMA jack for optional external master clock input

Test Points

SPI signal access (CS, SCLK, DIN, DOUT/RDY); remove R9-R13

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: Project Source Path

Application Example

This is a simple example that initializes the AD7124-4 ADC via ad7124_setup() and reads all device registers to confirm the configuration. It then enters a continuous loop where it waits for ADC conversions to complete using ad7124_wait_for_conv_ready() and reads the conversion result via ad7124_read_data(). The obtained raw ADC data is printed to the console.

No-OS Supported Platforms

Xilinx Platform

Used Hardware

Connections

The EVAL-AD7124-4SDZ connects to the ZedBoard via the SPI test points on the evaluation board. Remove the 0 Ohm links R9 to R13 to access the SPI signals directly.

EVAL-AD7124-4SDZ Pin	ZedBoard Pin	Function
CS	SPI_CS	Chip Select
SCLK	SPI_CLK	Serial Clock
DIN	SPI_MOSI	Data In (Master Out Slave In)
DOUT/RDY	SPI_MISO	Data Out / Data Ready
GND	GND	Ground

Consult the ZedBoard User Guide for Pmod or FMC header pinouts. Verify that the logic voltage levels are compatible; the AD7124-4 supports a digital I/O supply (IOVDD) between 1.65V and 3.6V.

Build Command

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