In terms of power sequencing for the ADG708 mux is it OK to tie the ENABLE pin permanently to a system GND to permanently enable the multiplexer?
This means the enable input will be tied low as power is applied and I do not want to risk damage or stress to the CMOS etc
The multiplexer is used in a single supply 3V system
Many thanks for any info
Hi Elver,
Tieing the ENABLE pin permanently to GND on the ADG708 CMOS switch, will ensure all 8 switch channel are off.
See Truth Table below: (pg 11 of ADG708 Datasheet)
Just so I am clear, is the main objective here to keep all 8-channels off, while the power is applied ?
Regards,
Kevin
Hi Elver,
Tieing the ENABLE pin permanently to GND on the ADG708 CMOS switch, will ensure all 8 switch channel are off.
See Truth Table below: (pg 11 of ADG708 Datasheet)
Just so I am clear, is the main objective here to keep all 8-channels off, while the power is applied ?
Regards,
Kevin
I've attached a drawing of the mux circuit. It is measuring a set of 8 passive complex impedances. The impedance measurement is made with an excitation waveform at 500mVpp sine wave with a 1.13V DC bias.
The EN pin would be tied to the 3V supply so this digital input would be high as soon as power to the circuit is applied.
The other digital inputs (A0..A2) would be controlled by a microcontroller and would all initialise as logic low.
Many Thanks
