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AMC1301: AMC1301 Problem

user44411751
Intellectual 940 points

Part Number: AMC1301
Other Parts Discussed in Thread: AMC1200

As shown in the figure below, the circuit use for high voltage detection.If U32,U36 is closed all the time, BAT+ is short to BAT- . When the device AMC1200 is used in U59 and U60, the input voltage between VIN+ and VIN- is 0mV .But When using the device AMC1301, the input voltage of VIN+ and VIN- at both ends is 15mV.

The higher the input voltage, the greater the error gain.What is different between AMC1301 and AMC1200?

  • 0
    TI__Guru**** 182551 points
    Hi there!

    Without being able to measure all the different nodes in your system, it's hard to say where the offset might be coming from. I suspect you are seeing a difference in the bias current from the AMC1301 versus the AMC1200. If you review the respective datasheets, the AMC1200 has a switched capacitor front end (see Figure 31), while the AMC1301 input looks more like a traditional diff amp input (see Figure 52 and the text associated with section 10.2.2).
  • 0 in reply to Tom Hendrick
    TI__Guru**** 182551 points
    Hi!

    Were you able to verify if there was any voltage drop caused by the bias current? That would explain the offset.