Lines Matching +full:pseudo +full:- +full:differential
1 .. SPDX-License-Identifier: GPL-2.0-only
41 * `AD7988-1 <https://www.analog.com/AD7988-1>`_
42 * `AD7988-5 <https://www.analog.com/AD7988-5>`_
45 ------------------
50 CS mode, 3-wire turbo mode
53 Datasheet "3-wire" mode is what most resembles standard SPI connection which,
56 "CS Mode, 3-Wire Turbo Mode" connection in datasheets.
57 NOTE: The datasheet definition of 3-wire mode for the AD4000 series is NOT the
58 same of standard spi-3wire mode.
62 Omit the ``adi,sdi-pin`` property in device tree to select this mode.
66 +-------------+
67 + ----------------------------------| SDO |
69 | +-------------------| CS |
71 | +--------------------+ | HOST |
73 +--->| SDI AD4000 SDO |-------->| SDI |
75 +--------------------+ | |
77 +--------------------| SCLK |
78 +-------------+
80 CS mode, 3-wire, without busy indicator
83 Another wiring configuration supported as "3-wire" mode has the SDI pin
84 hard-wired to digital input/output interface supply (VIO). In this setup, the
89 Set the ``adi,sdi-pin`` device tree property to ``"high"`` to select this mode.
93 +-------------+
94 +--------------------| CS |
96 VIO +--------------------+ | HOST |
98 +--->| SDI AD4000 SDO |-------->| SDI |
100 +--------------------+ | |
102 +--------------------| SCLK |
103 +-------------+
110 +-------------+
111 +--------------------| GPIO |
113 VIO +--------------------+ | HOST |
115 +--->| SDI AD4000 SDO |-------->| SDI |
117 +--------------------+ | |
119 +--------------------| SCLK |
120 +-------------+
122 CS mode, 4-wire without busy indicator
125 In datasheet "4-wire" mode, the controller CS line is connected to the ADC SDI
129 Set ``adi,sdi-pin`` to ``"cs"`` to select this mode.
134 +-------------+
135 + ----------------------------------| CS |
137 | +-------------------| GPIO |
139 | +--------------------+ | HOST |
141 +--->| SDI AD4000 SDO |-------->| SDI |
143 +--------------------+ | |
145 +--------------------| SCLK |
146 +-------------+
151 The AD4000 series driver supports differential and pseudo-differential ADCs.
156 configuration register, which is only possible when the ADC is wired in 3-wire
160 Besides that, differential and pseudo-differential voltage channels present
163 Pseudo-differential ADCs
164 ------------------------
166 Typical voltage channel attributes of a pseudo-differential AD4000 series device:
168 +-------------------------------------------+------------------------------------------+
172 +-------------------------------------------+------------------------------------------+
174 +-------------------------------------------+------------------------------------------+
176 +-------------------------------------------+------------------------------------------+
178 +-------------------------------------------+------------------------------------------+
180 Differential ADCs
181 -----------------
183 Typical voltage channel attributes of a differential AD4000 series device:
185 +-------------------------------------------+------------------------------------------+
188 | ``in_voltage0-voltage1_raw`` | Raw ADC output code. |
189 +-------------------------------------------+------------------------------------------+
190 | ``in_voltage0-voltage1_scale`` | Scale factor to convert raw value to mV. |
191 +-------------------------------------------+------------------------------------------+
192 | ``in_voltage0-voltage1_scale_available`` | Toggles input span compression |
193 +-------------------------------------------+------------------------------------------+
196 -------------------
205 in 3-wire turbo mode or in 3-wire without busy indicator mode and have SPI
212 ``in_voltage0-voltage1_sampling_frequency`` file is provided to allow setting
218 wired in "3-wire" mode and only one transfer per sample is done when using SPI