My name is Nikolay Krotov. Our firm have some AD7699 and we try them. There is a problem . By datasheet it is 16 bit ADC. We try slowly (constant) signal. So we take data from ADC with 0.1sec period.
Regime ADC – external REF = 5.0v. Frequency SCK = 1MHz (from 0 to 1)
1- we set CNV=0
2 – we transmit CFG – 14 bit(0x3C51) + 2 bit =0 and simultaneously we take 16 bit data
3- we set CNV=1 (start new conversion)
If signal<1.2v we see LSB bits, but If signal>1.2v three LSB bits are always equal 1? It’s look like it’s 13 bit ADC ! What’s wrong?
my email: email@example.com