ADL5801 Vset input current

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.

  • 0
    •  Analog Employees 
    on Nov 19, 2010 3:14 AM

    Hi Rich,

    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.

    R10 (Ω) VSET (V) Ipos (mA)
    226 4.5 160
    562 4.01 146
    568 4 145
    659 3.9 142
    665 3.89 142
    694 3.85 142
    760 3.8 139
    768 3.79 139
    1000 3.6 133
    1100 3.53 131
    1150 3.5 130
    1200 3.47 129
    1300 3.4 127
    1400 3.35 126
    1500 3.3 124
    1600 3.26 122
    1700 3.21 121
    1800 3.17 120
    1900 3.14 119
    2000 3.1 118
    2300 3 114
    5900 2.5 98
    OPEN 2.03 82

    Note: Ipos is the mixer supply current.

    Regards,

    Rui

  • Hi Rui,

    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

    Regards

    Diaegus

  • 0
    •  Analog Employees 
    on Aug 2, 2012 1:44 AM

    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.

  • 0
    •  Analog Employees 
    on Aug 2, 2018 4:20 PM
    This question has been assumed as answered either offline via email or with a multi-part answer. This question has now been closed out. If you have an inquiry related to this topic please post a new question in the applicable product forum.

    Thank you,
    EZ Admin