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How to enable the first five channel in the analog to digital convert AD7739?
The answer depends on whether you want to do a single conversion or perform continuous conversions. For a single conversion, set the mode bits in the mode registers to 010. For continuous conversions, set bit 3 in the corresponding channel setup registers and set the mode bits of the first channel to 001.
As there are other registers that must be set too, you should read the data sheet of that ADC: www.analog.com/.../AD7739.pdf
Thomas
Thomas Brandl i have done all you say but how to specify that i want to convert the first five channel?
I do not understand your question. What did you do? Single conversion or continuous conversions? Assuming you want to start single conversions for the first five channels, just set bits 7 to 5 of the corresponding five mode registers (0x38 to 0x3C) to "010".
assuming i want to start continuous conversions for the first five channels,how can i do it?
Did you read the data sheet? It's all in it. As I explained before, set bit 3 (enable) in the corresponding channel setup registers (in your case they have the addresses 0x28 to 0x2C) and in the mode register of the first channel (i.e. in your case register 0x38) set the mode bits to "001".
thank's Thomas Brandl yes i have read the datasheet!now i am going to do that you explain