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AM263P4-Q1: Resolver ADC input range

Frank A.
Prodigy 130 points

Part Number: AM263P4-Q1

Hello,

datasheet SPRSP81D lists for ADC_R: 

Input Conversion Range (Vin+, Vin-) Must be < VDDA33
min: 0 
max: 33/18 × VREFHI

But in realitiy >=3.2V (single ended) result in 4095, so is the datasheet wrong or am I just missunderstanding something? 

Best regards,
Frank

  • +1
    TI__Expert 3060 points

    Hi Frank,

    The ADC_R is very similar in functionality to the normal ADCs(meaning ADC0 to ADC4). So here too the same clipping of anything above 3.2V applies similar to other ADCs(see screenshot below of Section 7.5.2.3.4 ADC Modes of Operation of AM263P Technical Reference Manual). Voltages of anything <=33/18 × VREFHI, which is <=3.3V can be applied, but conversion results show the ADC code of 4095 for voltages of 3.2V and above.

    Thanks,
    Tejas Kulakarni

  • 0 in reply to Tejas Kulakarni
    Prodigy 130 points

    ok thanks. the datasheet and reference manual are a bit confusing on these points to be honest.