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ADC Capabilities of SYSMON

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The heart of UltraScale FPGA-based SYSMON is designed around a 10-bit ADC,  capable of working at 200 KSPS (kilo samples per second). It is commonly used  between the external analog signals as well as on-chip sensors. The SYSMON ADC  has nominal external input voltage range of 0–1 V. Various operating modes of the  ADC, sensors, and analog inputs can be configured using the SYSMON Control  Registers. The ADC supports Unipolar Mode (which is default mode) of operation  for on-chip sensors, while for external channels both the Unipolar and Bipolar operation modes are supported. The ADC always produces 16-bit conversion result,  out of which the 10 MSB (left most bits) represent the 10-bit transfer function,  which is stored in the Status Registers. The remaining six LSB can be used to  improve the resolution through averaging or filtering.

In case of Unipolar Mode, for input of 0 V, the ADC produces 0x000h code,  while for the highest input of 1 V the ADC produces full-scale code of 0x3FFh.  This shows that the ADC output in Unipolar Mode is straight binary equivalent.  Each bit increase represents 977 μV increase. When external analog inputs are configured as Bipolar Mode, they can accommodate true differential and bipolar analog  signals. The output coding of ADC in Bipolar Mode is two’s complement. In this  case also each of the bit count represents 977 μV. The diagrammatic representation  of the Unipolar and Bipolar Modes transfer function of SYSMON is as shown in  Fig. 16.3 and 16.4. Note the upper range of binary code representation is the same for  Unipolar and Bipolar Mode. The output coding of the ADC in Bipolar Mode is two’s  complement and indicates the sign of the input signal on VP relative to VN.

Unipolar transfer function of SYSMON ADC.png

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