AD9083 no-OS Driver

Supported Devices

• AD9083

Overview

The AD9083 is a 16-channel, 125MHz bandwidth continuous-time sigma-delta (CTSD) analog-to-digital converter (ADC) that incorporates an integrated programmable single-pole antialiasing filter and termination resistor. It is designed to offer low power consumption and a compact form factor, ensuring ease of use for a wide range of applications. Each ADC core is composed of a first-order CTSD modulator, embedded background nonlinearity correction, and self-cancelling dither to accommodate wide bandwidth differential inputs. The device features a built-in voltage reference, cascaded integrator comb (CIC) filter, and a quadrature digital downconverter (DDC) with FIR decimation filters. It delivers high-speed Subclass 1 JESD204B serialized output, configurable in various lane arrangements, and supports synchronization across multiple devices. Additionally, the AD9083 provides flexible power-down options and is programmable via a 1.8V compatible 3-wire SPI interface. It operates within a temperature range of −40°C to +85°C and is available in a 100-ball CSP_BGA package.

Applications

• Millimeter wave imaging

• Electronic beam forming and phased arrays

• Multichannel wireless receivers

• Electronic support measures

Operation Modes

Mode Name	Description	Typical Use Case
AD9083_JESD_TX_TEST_MODE_DISABLED	Disable Test Mode for the JESD transmitter.	Use when no test mode is necessary.
AD9083_JESD_TX_TEST_MODE_CHECKER_BOARD | Checkerboard Test Mode | Testing of data for sending checkerboard| integrity in JESD pattern data. | interface.
AD9083_JESD_TX_TEST_MODE_WORD_TOGGLE	Word Toggle Test Mode for toggling word patterns.	Verification of JESD interface by toggling words.
AD9083_JESD_TX_TEST_MODE_PN31	PN31 Test Mode for sending pseudo-random binary sequence data.	Performance testing using pseudo-random data.
AD9083_JESD_TX_TEST_MODE_PN15	PN15 Test Mode based on pseudo-random patterns.	Used in scenarios requiring less complexity than PN31.
AD9083_JESD_TX_TEST_MODE_PN7	PN7 Test Mode operating with simplified pseudo-random patterns.	For less extensive testing environments.
AD9083_JESD_TX_TEST_MODE_RAMP	Ramp Test Mode simulating ramping data stream.	Simulation of continuous increase in data which aids in buffer testing.
AD9083_JESD_TX_TEST_MODE_USER_REPEAT	Repeated User Data Test Mode for sending same data patterns repeated over time.	Validation with known static patterns repeated over time.
AD9083_JESD_TX_TEST_MODE_USER_SINGLE	Single Time User Data Test Mode for one-off pattern testing.	Used for transient data verification.

Device Configuration

Initialization and Configuration

The ad9083.c file encompasses critical functions necessary for the initialization and configuration of the AD9083 device. The ad9083_init function facilitates device preparation by allocating required resources, configuring GPIOs and SPI communication, and validating the chip ID against expected values. Subsequently, it invokes the ad9083_setup function to establish parameters such as clock settings and ADC configurations based on a specified configuration index. During the setup process, the function executes a software reset and device initialization, while also adjusting JESD204 subclass settings as required. The ad9083_remove function ensures proper resource deallocation by releasing memory and removing SPI and GPIO descriptors when the device is no longer in use.

Register and SPI Communication

SPI communication is facilitated through functions like ad9083_reg_get and ad9083_reg_set, which handle reading and writing to device registers. ad9083_reg_get uses the device’s SPI descriptor to read a specified register, while ad9083_reg_set writes a value to a register. Both ensure valid addresses and handle errors. The ad9083_spi_xfer function manages data flow during SPI transfers, checking data sizes and ensuring communication success.

Utility

Utility functions in the file support the AD9083’s management and operation. ad9083_log_write logs messages by severity levels, including warnings and errors. ad9083_udelay provides microsecond-level delays for synchronizing operations, and ad9083_reset_pin_ctrl manages the device’s reset state via GPIOs, enabling programmatic resets. These utilities support robust operation and debugging.

Driver Initialization Example

#include "ad9083.h"
#include "no_os_spi.h"
#include "no_os_gpio.h"

// Define the initialization parameters
struct ad9083_init_param init_param = {
    .spi_init = {
        .max_speed_hz = 1000000,
        .chip_select = 0,
        .mode = NO_OS_SPI_MODE_0,
        .extra = NULL,
    },
    .gpio_reset = {
        .number = 0,
        .extra = NULL,
    },
    .some_settings = 0, // Add any device-specific settings here
};

int main(void) {
    struct ad9083_dev *dev;
    int ret;

    // Initialize the device
    ret = ad9083_init(&dev, &init_param);
    if (ret) {
        printf("Initialization failed!\n");
        return ret;
    }

    // Use the device (e.g., read data, configure settings)
    // ...

    // Clean up
    ad9083_remove(dev);

    return 0;
}