Double Sample Conversions

When enabling a Double Sample Conversion (DSEN = 1), with no Precharge time (ADPRE = 0) and no Acquisition time (ADACQ = 0), the maximum number of cycles of acquisition time is inserted prior to the second conversion. The first conversion will be performed as expected with no Precharge time and no Acquisition time. It is only between the first and second conversions where a maximum number of cycles of Acquisition time is performed unexpectedly.

Work around

  • Method 1: Disable Double Sample Conversion (DSEN = 0) and perform two single conversions back to back.
  • Method 2: If adding acquisition time is acceptable, then select no Precharge time, along with the desired Acquisition time.

Affected Silicon Revisions

A2 A3
X X
Parent topic: Module: ADCC - Analog-to-Digital Converter with Computation