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connect AD converter 7903 with SPI from STM32F4

Question asked by dirkson on Nov 2, 2014
Latest reply on Feb 13, 2015 by Clive One
Hello,

I want to connect an AD converter AD7903 with the STM32F429
http://www.analog.com/static/imported-files/data_sheets/AD7903.pdf
The AD7903 can be driven in a simultaneous sampling mode. It is show in the datasheet on page 25.

1.
Im not sure, if I have connect the AD7903 in the right way. I want to connect it, like in the picture.
Is that ok, or must I split the clk conduct in CLK from SPI1 and CLK from SPI2?
But then I have the problem, that is not be simultaneous.

2.
I dont use the MOSI pins. Can I use them as a normaly pin, if I not activate the alternative function of this pin.

3.
The maximum datarate of the AD7903 is 1MSPS. Is the STM32F429 with SPI fast enough?
I have estimate if f_PCLK = 84MHz and I use a divider of 2, than I get a clock frequency of 42MHz. If I transmit 16Bit I get
42MHz/16 = 2,625 MSPS. Is that ok?

4. Is it possible to get samples of the STM32F429ZIT6 ? I have try it, but I get the answer, that I can buy it by xyv distributor.

Thank you very much, for your help in advance

Best regards

Dirk

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