Could the 3065 and 3055 share the same design, minus the reference quality ??
The SDM3065X uses a LM399H (0.3ppm/C with 20ppm/1000h and 7uV noise) voltage reference and AD7175-2 "B" A/D (up to 24 peak-to-peak bits and 24 effective bits at 5 to 16 SPS).
The SDM3055 uses a MAX6325 "C" (0.5ppm/C with 30ppm/1000h and 1.3uV noise) voltage reference and AD7190 "B" A/D (up to 22.5 peak-to-peak bits and 24 effective bits at 4.7 SPS).
The SDM3045X uses TI REF5025K "High grade" (2.5ppm/C with 100ppm/1000h and 3uV noise ) and AD7190 "B" A/D (up to 22.5 peak-to-peak bits and 24 effective bits at 4.7 SPS).
Edit 2019-08-18Difference vs SDM3055 :
- SDM3065X uses a separate power supply
- SDM3065X uses a LM399H voltage reference and a higher resolution ADC
- SDM3045X uses lower grade components but with a SDM3055 design (or SDM3055X-E PCB)
I suspect the SDM3055 could have a better ADC (see un populated U503 SSOP28) like ADS1256 (seems to be compatible)
Q: The hacked firmware, does it come from the 3065 ??
I'm only using the original SDM3055 firmware.