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Recent content by wlamers

  1. W

    Switchable pullup/pulldown resistors

    I have a digital input to an embedded system that needs switchable pullup and pulldown resistors. The input has nothing more than ESD protection and a 3.3v clamp diode to prevent high voltage input signals to be saturated. The switching frequency is max 1 Mhz. The pullup and pulldown resistor...
  2. W

    Synchronized distributed clock design for multiple microcontrollers

    Hellp per_lube, Thanks for your response. I am aware of trace length matching (like USB high-speed routing). But what would be the best solution in terms of a clock generator with multiple outputs (and insensitivity for vibration). Do you recommend a specific generator (e.g. From Maxim)?
  3. W

    Synchronized distributed clock design for multiple microcontrollers

    I have a design that requires two identical microcontrollers (NXP LPC43xx series) to be clock synchronized. Main objective is to have a timer in both at the same clock speed. What would be the best way to achieve this? I know there are clock distribution IC's requiring only one input crystal...
  4. W

    MOSFET to switch termination resistor in CAN bus network

    That would be a perfect solution due to its LED isolation. Altough these PhotoMOS relays seems to be pricey... I end up with this schematic. Is this what you mean?
  5. W

    MOSFET to switch termination resistor in CAN bus network

    What would be the best method to switch a pair of 60ohm or one 120ohm termination resistors on the end node of a CAN bus on and off? Could I use a MOSFET here? The source is not attached to ground since CAN is a differential pair. How would the schematic look like? ESD is also an issue here.
  6. W

    ADC/DAC powersupply with negative outputs

    Hello All, I have a board with a switched mode supply and a post regulating LDO. Switch mode supply can be set to give max 6V (TI LMZ14201). The LDO is set to 3.3V (TI TPS7a4700). I also require a buffered DAQ that can generate 0-10V or +/-10V (providing >20mA). Therefore I was planning to use...
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