blob: 61761e3b75c39db67648389eeb4b2326d64ebc11 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
|
.. 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.
|
