Is there any spec available for the input current on the Vset pin (pin10) for the ADL5801. This would be useful for knowing which value resistors to chose for biasing this pin.
VSET pin (pin 10) is a voltage control pin. If you plan to use a fixed VSET voltage to control the mixer bias, below has a lookup table. In this mode, R7 and R9 on Figure 33 should remian OPEN.
Note: Ipos is the mixer supply current.
at page 27 of ADL5801 datasheet I read "Internally, the VSET pin features a series resistance and diode to ground; hence a simple voltage divider driving the pin is not sufficient" so the table for the proper choice of R10 follows. At page 33 I found another statement instead: "R9 and R10 form an optional resistor divider network between VPOS and GND, allowing for a fixed bias setting". So is it possible to control VSET by a voltage divider o not? and what about the choice of resistance values (R9 and R10) in this case?
I thank you in advance
We recommend adjusting the mixer bias level (VSET) by adjusting R10 and leaving R7 and R9 open. You can use Table 4 on the datasheet as a guideline to picking the appropriate value of R10.
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