interface: SPI Main ADC chip: TM7705 (Shenzhen Tianwei original brand new chip, and AD7705 chip is fully compatible)
LM285-2.5 external reference voltage (imported genuine original). Part of the low-end domestic counterparts using TL-431 is not a number as a reference, temperature stability and accuracy of the level difference. Please spotted.
The input circuit with dividing resistor and RC filter, enabling customers to change their own gain range Chip programmable gain amplifier,
the gain range: 1-128 times Chip buffer amplifier input with direct connection sensor - See more at: https://www.uctronics.com/ad7705-tm7705-dual-channel-16-bit-adc-data-acquisition-module-spi.html#sthash.3JwmlLF3.dpuf