Hiya,

I’m utilizing twin provide gadget with ADC (10M50DAF484I7G). In my design I initially related ADC_VREF pin to 2.5V and VCCIO1A/VCCIO1B (so additionally JTAG connector) to three.3V. I am unsure if that is allowed. Listed below are my concerns:

“Intel® MAX® 10 FPGA Configuration Person Information” part 3.2.3 “JTAG Configuration Setup” clearly states that JTAG pull-up resistors and pin 4 on JTAG connector needs to be related to VCCIO financial institution 1B (or financial institution 1 in 10M02).

As well as there isn’t a restriction for voltage on VCCIO Financial institution 1A and 1B in “Intel® MAX® 10 FPGA Gadget Household Pin Connection Tips” aside from 1.0V just isn’t supported. So it may be related to three.3V.

BUT (!)

The identical paperwork states:

– “If the VREF pin is used, it’s essential to join the VCCIO1A and VCCIO1B pins to the identical voltage degree.” (See Desk 7, VCCIO[#]).

– And in addition in Desk 6, part ADC_VREF: “Tie the ADC_VREF pin to an exterior correct voltage reference supply. If you’re not utilizing the exterior reference, this pin is a no join (NC).”

And there’s a spec in “Intel® MAX® 10 Analog to Digital Converter Person Information”, part 5.1, that voltage on exterior ADC reference requirement is: “Twin provide gadgets: as much as 2.5 V”

Please appropriate me if I am mistaken:

There  are following advisable options:

• If ADC is used, and we wish to use exterior reference then ADC_VREF, VCCIO_1A, VCCIO_1B needs to be related to 2.5V and that suggests that pull-ups and programmer connector pin 4 also needs to be related to 2.5V. 
• If ADC is used and we do not wish to use exterior reference then ADC_VREF needs to be not related and VCCIO_1A and VCCIO_1B nonetheless should be related to 2.5V, as a result of Inside reference is equipped from VCCA, that (per datasheet) needs to be related to 2.5V.
• If ADC is NOT used, then VCCIO_1A and VCCIO_1B, so additionally pull-ups and programmer connector pin 4 can be related to three.3V, however VREF needs to be not related (NC).
• Connecting VCCIO_1B to three.3V and ADC_VREF to 2.5V in twin provide gadgets just isn’t advisable and even forbidden.