Documentation/iio/ad7380.rst

1 .. SPDX-License-Identifier: GPL-2.0-only
23 * `AD7380-4 <https://www.analog.com/en/products/ad7380-4.html>`_
24 * `AD7381-4 <https://www.analog.com/en/products/ad7381-4.html>`_
25 * `AD7383-4 <https://www.analog.com/en/products/ad7383-4.html>`_
26 * `AD7384-4 <https://www.analog.com/en/products/ad7384-4.html>`_
27 * `AD7386-4 <https://www.analog.com/en/products/ad7386-4.html>`_
28 * `AD7387-4 <https://www.analog.com/en/products/ad7387-4.html>`_
29 * `AD7388-4 <https://www.analog.com/en/products/ad7388-4.html>`_
36 ----------------
42 -----------------
44 ad7380-4
47 ad7380-4 supports only an external reference voltage (2.5V to 3.3V). It must be
48 declared in the device tree as ``refin-supply``.
55 - Internal reference (2.5V)
56 - External reference (2.5V to 3.3V)
58 The source is determined by the device tree. If ``refio-supply`` is present,
61 Oversampling and resolution boost
62 ---------------------------------
69 When the on-chip oversampling function is enabled the performance of the ADC can
70 exceed the default resolution. To accommodate the performance boost achievable,
72 resolution boost feature can only be enabled when oversampling is enabled and
73 oversampling is not as useful without the resolution boost, the driver
74 automatically enables the resolution boost if and only if oversampling is
77 Since the resolution boost feature causes 16-bit chips to now have 18-bit data
83 .. code-block:: bash
87 Channel selection and sequencer (single-end chips only)
88 -------------------------------------------------------
90 Single-ended chips of this family (ad7386/7/8(-4)) have a 2:1 multiplexer in
92 allow for either manual selection or automatic switching (sequencer mode), of
96 export 4 channels and ad7386-4/7-4/8-4 export 8 channels.
99 0-1 or 0-3) and inputs ``AinX1`` correspond to second half (i.e 2-3 or 4-7).
102 .. code-block::
105 	         |         +----------------------------
108 	voltage0 | AinA0 --|--->|     |      |      |
109 	         |         |    | mux |----->| ADCA |---
110 	voltage2 | AinA1 --|--->|     |      |      |
114 	voltage1 | AinB0 --|--->|     |      |      |
115 	         |         |    | mux |----->| ADCB |---
116 	voltage3 | AinB1 --|--->|     |      |      |
119 	         |         +----------------------------
122 When enabling sequencer mode, the effective sampling rate is divided by two.
125 ----------------------
127 - 2/4 SDO lines
128 - Rolling average oversampling
129 - Power down mode
130 - CRC indication
131 - Alert