.. SPDX-License-Identifier: GPL-2.0-only

==================== AD7625 driver

ADC driver for Analog Devices Inc. AD7625, AD7626, AD7960, and AD7961 devices. The module name is ad7625.

Supported devices

The following chips are supported by this driver:

AD7625 <https://www.analog.com/AD7625>_
AD7626 <https://www.analog.com/AD7626>_
AD7960 <https://www.analog.com/AD7960>_
AD7961 <https://www.analog.com/AD7961>_

The driver requires use of the Pulsar LVDS HDL project:

Pulsar LVDS HDL <http://analogdevicesinc.github.io/hdl/projects/pulsar_lvds/index.html>_

To trigger conversions and enable subsequent data transfer, the devices require coupled PWM signals with a phase offset.

Supported features

Conversion control modes

The driver currently supports one of two possible LVDS conversion control methods.

Echoed-Clock interface mode ^^^^^^^^^^^^^^^^^^^^^^^^^^^

.. code-block::

                                            +----------------+
                 +xxxxxxxxxxxxxxxxxxxxxxxxxx| CNV            |
                 X                          |                |
                 v                          |    HOST        |
      +----------------------------+        |                |
      |      CNV+/CNV-   DCO+/DCO- |xxxxxxx>| CLK_IN         |
      |                            |        |                |
      |                            |        |                |
      |       AD7625         D+/D- |xxxxxxx>| DATA_IN        |
      |                            |        |                |
      |                            |        |                |
      |                  CLK+/CLK- |<xxxxxxx| CLK & CLK_GATE |
      +----------------------------+        |                |
                                            +----------------+

Reference voltage

Three possible reference voltage sources are supported:

Internal reference (only available on AD7625 and AD7626)
External reference and internal buffer
External reference

The source is determined by the device tree. If ref-supply is present, then the external reference is used. If refin-supply is present, then the internal buffer is used. If neither is present, then the internal reference is used.

Unimplemented features

Self-clocked mode

Device attributes

The AD762x is a fully-differential ADC and has the following attributes:

+---------------------------------------+--------------------------------------------------------------+ | Attribute | Description | +=======================================+==============================================================+ | scale | Scale factor to convert raw value from buffered reads to mV. | +---------------------------------------+--------------------------------------------------------------+

Device buffers

This driver supports IIO triggered buffers.

See :doc:iio_devbuf for more information.