Question about Pass D1 I/V output stage

[PatPet]

Hello,

I have a DAC with parallel AD1865N-K. But I'm not sure whether the output stage will work fine or not.

The current output in each Iout pin is +/- 1mA. Therefore when I have 8 of them connected in parallel, Iout becomes +/- 8mA.

And now in the Pass output stage the IRF610 is biased at 10mA. Does that mean the limit of Iout will be 10mA? Furthermore, what shall I do if I stack 16 of them in each channel?

Regards,

PatPet

 

[CraigBuckingham]

If IRF610 is in common gate configuration then its current will be +18mA to +2mA. If there is an I/V resistor you will need to lower its resistance by the same factor you increased the current swing by to have the same output voltage swing.