• State TI Thinks Resolved
  • Locked Locked
  • Replies 1 reply
  • Answers 1 answer
  • Subscribers 46 subscribers
  • Views 334 views
  • Users 0 members are here
Support feedback
Options
Options
Related

This thread has been locked.

If you have a related question, please click the "Ask a related question" button in the top right corner. The newly created question will be automatically linked to this question.

AMC7834: Confirmation

May
Genius 9880 points
Part Number: AMC7834

Hi,

Customer have confirmation regarding this IC, please see details below.

"The datasheet indicates the bipolar DACs can source or sink up to 10 mA, which I would assume means the voltage is programmable. However, then it shows plots of bipolar DAC voltage vs current. in Figures 23 and 24.

The question is can the bipolar DAC output voltage be programmed to anywhere from -5V to 0V if the load is sinking 10 mA into it?

Can the internal or remote temperature sensors be used to adjust the DAC output voltage based on the sensor reading in addition to the adjustment of the DAC output voltage due to the ADC inputs (from current sense resistors)?
"

Thank you in advance.

Regards,
Maynard

  • 0
    TI__Guru 53793 points

    Hi Maynard,

    The outputs are programmable from -5V to 0V, even while sinking or sourcing current.  The load current will effect the accuracy of the output, as there is an output impedance (~1Ω), so you might see some error when sinking that current. The plots are showing the case were the load is being applied while the DAC is operating near the supply rail.  If the output amplifier of the DAC does not have headroom/footroom, then the output impedance will increase.  It is recommended that you use a VSS supply of -5.5V if you are using the -5V range, so the amplifier will have 500mV of margin.

    The remote and local temperature sensors can be monitored by the SPI host, but the device does not offer any closed-loop functions for the temperature sensor. You would need to implement the closed-loop operation in your MCU.

    Thanks,

    Paul