54 lines
2.6 KiB
Plaintext
54 lines
2.6 KiB
Plaintext
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What: /sys/bus/iio/devices/iio:deviceX/boost_current_gain
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KernelVersion: 6.4
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Contact: linux-iio@vger.kernel.org
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Description:
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This attribute is used to set the gain of the biasing current
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circuit of the Delta-Sigma modulator. The different BOOST
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settings are applied to the entire modulator circuit, including
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the voltage reference buffers.
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What: /sys/bus/iio/devices/iio:deviceX/boost_current_gain_available
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KernelVersion: 6.4
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Contact: linux-iio@vger.kernel.org
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Description:
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Reading returns a list with the possible gain values for
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the current biasing circuit of the Delta-Sigma modulator.
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What: /sys/bus/iio/devices/iio:deviceX/auto_zeroing_mux_enable
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KernelVersion: 6.4
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Contact: linux-iio@vger.kernel.org
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Description:
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This attribute is used to enable the analog input multiplexer
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auto-zeroing algorithm (the input multiplexer and the ADC
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include an offset cancellation algorithm that cancels the offset
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contribution of the ADC). When the offset cancellation algorithm
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is enabled, ADC takes two conversions, one with the differential
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input as VIN+/VIN-, one with VIN+/VIN- inverted. In this case the
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conversion time is multiplied by two compared to the default
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case where the algorithm is disabled. This technique allows the
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cancellation of the ADC offset error and the achievement of
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ultra-low offset without any digital calibration. The resulting
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offset is the residue of the difference between the two
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conversions, which is on the order of magnitude of the noise
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floor. This offset is effectively canceled at every conversion,
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so the residual offset error temperature drift is extremely low.
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Write '1' to enable it, write '0' to disable it.
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What: /sys/bus/iio/devices/iio:deviceX/auto_zeroing_ref_enable
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KernelVersion: 6.4
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Contact: linux-iio@vger.kernel.org
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Description:
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This attribute is used to enable the chopping algorithm for the
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internal voltage reference buffer. This setting has no effect
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when external voltage reference is selected.
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Internal voltage reference buffer injects a certain quantity of
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1/f noise into the system that can be modulated with the
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incoming input signals and can limit the SNR performance at
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higher Oversampling Ratio values (over 256). To overcome this
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limitation, the buffer includes an auto-zeroing algorithm that
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greatly reduces (cancels out) the 1/f noise and cancels the
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offset value of the reference buffer. As a result, the SNR of
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the system is not affected by this 1/f noise component of the
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reference buffer, even at maximum oversampling ratio values.
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Write '1' to enable it, write '0' to disable it.
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