Hello
The datasheet for the DDC112 gives the minimum integration time in continuous mode as 500us @ 10MHz clock. That means that the conversion signal must be low or high for a minimum of 5000 clock cycles when operating in the continuous mode.
However. The DDC goes from continuous to dis-continuous mode if the conversion signal change before the m/r/az cycle is completed i.e. when mbsy = 1. After the conversion signal changes polarity mbsy = 1 for t6 = 4794 clock cycles. So the switch over point to dis-continuous mode is when the conversion signal change faster than 4794 clock cycles period long. See figure 10 in the datasheet for t6 and figure 9 for the state diagram.
So if you start with a conversion signal that toggles every 5000 clock cycles you are in continuous mode. If you progressively toggle conversion faster i.e. at rates like 4900 clocks or 4800 clocks you remain operating in the continuous mode. You should then be able to go down to 4794 clocks long conversion signal lengths and still operate in the continuous mode. When you toggle conversion faster than 4794 clocks you change over to discontinuous mode.
Now my question are:
1. Is my understanding of points where one switch between continuous and dis-contnuous mode as described above correct?
2. Why does the datasheet recommend a minimum conversion signal toggle rate of 5000 clocks?
