Meaning
Signal acquisition circuitry requires a defined interval to transition between channels before the output attains the required accuracy level. Multiplexer settling time defines the duration from the moment the input address changes until the output remains within a specified percentage of the final voltage value. This duration includes the time for the internal switch to close and for the amplifier to recover from potential transients generated during the transition.
The performance parameter dictates the maximum sampling rate achievable for a given channel array.
Temporal Requirements
Designers calculate the necessary throughput by adding the duration of the selection process to the conversion period of the analog to digital converter. An insufficient wait period causes the conversion to lock onto a value that reflects the previous channel state rather than the intended target signal. Such errors lead to crosstalk between adjacent inputs when the signal voltage deviates significantly across channels.
Voltage Impact
Capacitive loading on the analog bus stretches the period needed for the signal to stabilize. High impedance sources produce longer delays because the resistance interacts with stray capacitance to form a low pass filter that slows the rise time of the voltage step. The output amplifier must source or sink sufficient current to charge this capacitance within the allotted window.
Systemic Limitation
Faster switching speeds create a hardware bottleneck where the signal integrity degrades beneath the resolution of the converter. Precise timing logic compensates for these delays to ensure every sample reflects the actual state of the sensor. The speed of the hardware constraints the total system bandwidth.
