- Fri Nov 18, 2016 4:53 pm
#192358
Hello, query on the following:
Spark pin designation 36-39, sensor_vp - sensor_capp, sensor_vn - sensor_capn
This hints that an ADC input can be operated in differential input mode. Is this correct?
If true, then would Spark pin 34-35 be the differential input, pin 34 negative, 35 positive?
I think somewhere I read that the preamp has an amplification of 60db. Is that right?
Also if true, is that gain fixed or adjustable in code?
I assume the 270pF caps are used by the internal op amp to set (limit) bandwidth, stabilize and prevent self oscillation, correct? Is there any info on determining the cap value?
Thoughts on why 270pF was used?
My project operates in a high RF field, Recommendations on where best to solder ADC decoupling caps? Note: Circuitry is in a shielded enclosure (alum - rf gaskets - ceramic feed through caps).
Spark pin designation 36-39, sensor_vp - sensor_capp, sensor_vn - sensor_capn
This hints that an ADC input can be operated in differential input mode. Is this correct?
If true, then would Spark pin 34-35 be the differential input, pin 34 negative, 35 positive?
I think somewhere I read that the preamp has an amplification of 60db. Is that right?
Also if true, is that gain fixed or adjustable in code?
I assume the 270pF caps are used by the internal op amp to set (limit) bandwidth, stabilize and prevent self oscillation, correct? Is there any info on determining the cap value?
Thoughts on why 270pF was used?
My project operates in a high RF field, Recommendations on where best to solder ADC decoupling caps? Note: Circuitry is in a shielded enclosure (alum - rf gaskets - ceramic feed through caps).