If I use the AD1580 for reference voltage (Figure 10, pin 36 datasheet), what is the value of Vref in the formula?
IOR, IOB (mA) = 7989.6 × Vref / Rset
Vref is 1.235 V (internal reference voltage) or 1,225 V (provided by the AD1580)?
ADV7125 uses the external voltage reference. the Vref shall be AD1580.
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Biao is correct-- if you are using an external VRef, then that is the voltage you should use in the formula.
The external Vref value will be used. Over the operating temperature range of the AD1580, the Vref value is guaranteed to be 1.225V +- 5mV.
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