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ADC3644: External Reference

Part Number: ADC3644
Other Parts Discussed in Thread: OPA837, , REF3318

Hi team,

In the EVM of ADC3644, 1.6V of VREF is divided and supplied by REF3318 and OPA837.
Is this because there was no 1.6V reference?
If I use the ADC3644 with an external reference, does it need to be driven by an OPA837?
Is it possible to connect directly with REF3516?

Best Regards,