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C8051F062 Datasheet(PDF) 52 Page - Silicon Laboratories |
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C8051F062 Datasheet(HTML) 52 Page - Silicon Laboratories |
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52 / 328 page ![]() C8051F060/1/2/3/4/5/6/7 52 Rev. 1.2 Figure 5.2. 16-bit ADC0 and ADC1 Data Path Diagram 5.1. Single-Ended or Differential Operation ADC0 and ADC1 can be programmed to operate independently as single-ended ADCs, or together to accept a differential input. In single-ended mode, the ADCs can be configured to sample simultaneously, or to use different conversion speeds. In differential mode, ADC1 is a slave to ADC0, and its configuration is based on ADC0 settings, except during offset or gain calibrations. The DIFFSEL bit in the Channel Select Register AMX0SL (Figure 5.6) selects between single-ended and differential mode. 5.1.1. Pseudo-Differential Inputs The inputs to the ADCs are pseudo-differential. The actual voltage measured by each ADC is equal to the voltage between the AINn pin and the AINnG pin. AINnG must be a DC signal between -0.2 and 0.6 V. In most systems, AINnG will be connected to AGND. If not tied to AGND, the AINnG signal can be used to negate a limited amount of fixed offset, but it is recommended that the internal offset calibration features of the device be used for this purpose. When operating in differential mode, AIN0G and AIN1G should be tied together. AINn must remain above AINnG in both modes for accurate conversion results. 16 AIN0 16-Bit SAR ADC0 AMX0SL 16 AIN1 16-Bit SAR ADC1 ADC0H ADC0L ADC1H ADC1L 8 8 0 1 8 8 Single-Ended Differential ADC0LTL ADC0LTH ADC0GTL ADC0GTH 32 16 AD0WINT Window Compare 16 DMA Interface Σ + - AIN0G AIN1G |
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