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SPI of AD9633

As shown in the above figure,Read the register for AD9633,

The number read out should be 0x60, but the actual number read out is 0x63. What causes this?

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  • Hi Xmarcus724,

    0x63 is the correct value when reading Register 0x02 of AD9633-125. The only bits defined for Register 0x02 are Bits[6:4]. For the 125Msps speed grade, Register 0x02 Bits[6:4] = 6, which is what you are seeing. Bits[3:0] are not defined in the datasheet but 0x3 is the correct value for these bits.

    So, you are reading correctly. Thank you.

    Doug

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  • Hi Xmarcus724,

    0x63 is the correct value when reading Register 0x02 of AD9633-125. The only bits defined for Register 0x02 are Bits[6:4]. For the 125Msps speed grade, Register 0x02 Bits[6:4] = 6, which is what you are seeing. Bits[3:0] are not defined in the datasheet but 0x3 is the correct value for these bits.

    So, you are reading correctly. Thank you.

    Doug

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