With the default prescaler of 128, the maximum sample rate is
9615 samples/s (16 MHz/128/13). It can be achieved by setting the ADC to
"free running mode". Running analogRead() in a tight loop, the maximum
rate is 8929 S/s (16 MHz/128/14). As there is only one ADC, this is the
total rate for all inputs being sampled.
is there a way to disable muxing and select which one input is active
The MUX is a physical device that sits between the inputs and the ADC. You cannot physically remove it. What do you mean by "disable"? You can, of course, keep the channel selection constant.
I assumed that the muxer looks at each input in turn, but it may be that if I only ever read from channel 0, then the mux will never select another channel?
Indeed. You can think of the MUX as a 1P11T (one pole, eleven throw) switch. Each time you change the MUX setting, it moves to a different channel. If you don't change its setting, it doesn't move.
With the default prescaler of 128, the maximum sample rate is
9615 samples/s (16 MHz/128/13). It can be achieved by setting the ADC to
"free running mode". Running analogRead() in a tight loop, the maximum
rate is 8929 S/s (16 MHz/128/14). As there is only one ADC, this is the
total rate for all inputs being sampled.
is there a way to disable muxing and select which one input is active
The MUX is a physical device that sits between the inputs and the ADC. You cannot physically remove it. What do you mean by "disable"? You can, of course, keep the channel selection constant.
With the default prescaler of 128, the maximum sample rate is
9615 samples/s (16 MHz/128/13). It can be achieved by setting the ADC to
"free running mode". Running analogRead() in a tight loop, the maximum
rate is 8929 S/s (16 MHz/128/14). As there is only one ADC, this is the
total rate for all inputs being sampled.
is there a way to disable muxing and select which one input is active
The MUX is a physical device that sits between the inputs and the ADC. You cannot physically remove it. What do you mean by "disable"? You can, of course, keep the channel selection constant.
I assumed that the muxer looks at each input in turn, but it may be that if I only ever read from channel 0, then the mux will never select another channel?
Indeed. You can think of the MUX as a 1P11T (one pole, eleven throw) switch. Each time you change the MUX setting, it moves to a different channel. If you don't change its setting, it doesn't move.
With the default prescaler of 128, the maximum sample rate is
9615 samples/s (16 MHz/128/13). It can be achieved by setting the ADC to
"free running mode". Running analogRead() in a tight loop, the maximum
rate is 8929 S/s (16 MHz/128/14). As there is only one ADC, this is the
total rate for all inputs being sampled.
is there a way to disable muxing and select which one input is active
The MUX is a physical device that sits between the inputs and the ADC. You cannot physically remove it. What do you mean by "disable"? You can, of course, keep the channel selection constant.