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ADCMP572 Vcco =2.5?

Hi, I want to connect the ADCMP572 to the FPGA IO through the 2.5V cml buffer IC (SY56216r), but I am confused if it is okay to supply the VCCO of the ADCMP 572 with 2.5V.

The range of Vcco on the ADCMP 572 Datasheet is 3.1V~5.2V, but Figure 23 of page 12 of the datasheet shows that Vcco can be connected to 2.5V

If it is okay to set Vcco to 2.5V, it would be greatly appreciated if you could tell me if it is okay to connect it directly to 2.5V CML IC.
Also, if it is not possible to connect Vcco to 2.5v, I would appreciate if you could provide a simple conversion circuit to connect it to 2.5V cml IC input.
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  • Hi,

    Figure 23 does not show that VCCO can be connected to 2.5V, the total VCCO range in that figure is 3.3V-(-1V)=4.3V. 

    VCCO can be supplied with 2.5V on the positive but GND should be at least -0.6V to be in the specified range of 3.1V to 5.2V for VCCO. 

    If VCCO=2.5V, then you might need to use a CML Driver/Translator in between output of ADCMP572 and SY56216r, I could not recommend other manufacturer specific part but you can look through the web for possible components. If you want to avoid this additional component, you could take a look at ADCMP606 it can support VCCO=2.5V, however, it is slower than ADCMP572 and depending on your speed requirements it might/not suit your needs.

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  • Hi,

    Figure 23 does not show that VCCO can be connected to 2.5V, the total VCCO range in that figure is 3.3V-(-1V)=4.3V. 

    VCCO can be supplied with 2.5V on the positive but GND should be at least -0.6V to be in the specified range of 3.1V to 5.2V for VCCO. 

    If VCCO=2.5V, then you might need to use a CML Driver/Translator in between output of ADCMP572 and SY56216r, I could not recommend other manufacturer specific part but you can look through the web for possible components. If you want to avoid this additional component, you could take a look at ADCMP606 it can support VCCO=2.5V, however, it is slower than ADCMP572 and depending on your speed requirements it might/not suit your needs.

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