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AMC1203: Single ended input?

Part Number: AMC1203
Other Parts Discussed in Thread: AMC1210, , AMC1303M2520

My analog input signal is a positive voltage from a single-ended source. How should I configure the AMC1203 to accept this input, rather than a balanced input?

  • Hi Brian,

    The typical application diagram in the datasheet provides and example schematic: 

    Connect the device ground and negative input to the ground/reference of your signal source. 

    We have several newer devices that may be better suited to your application and provide higher performance. What type of application are you working on? 

  • Thanks, Alexander, that's the simple answer I hoped for. I didn't guess, from the diagram, that the answer would be so simple. I want to replace a conventional PWM circuit with this highly-oversampled implementation; I don't intend to drive a digital filter, like the AMC1210. I will evaluate my application with the AMC1203EVM.

    By "newer," do you refer to the higher-frequency parts in the family, or to something else?

  • Hi Brian,

    Happy to help. 

    The output is not a PWM but a digital bitstream proportional to the input voltage - requiring connection to an SDFM. 

    We have devices that operate up to higher clock frequencies, higher isolation ratings and higher accuracy.

    Take a look at the AMC1303M2520 for example: https://www.ti.com/product/AMC1303M2520

  • Followup question, Alexander: am I right in thinking that I can bias the (-) input to VDD/2 to get low duty factor with near zero volts on the (+) input and high duty factor with near VDD on the (+) input?

  • Hi Brian,

    Yes, you are correct. This scenario would result in the output clipping negative and positive.