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AN4073 Datasheet(PDF) 11 Page - STMicroelectronics |
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AN4073 Datasheet(HTML) 11 Page - STMicroelectronics |
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11 / 32 page  DocID022945 Rev 5 11/32 AN4073 STM32F2 and STM32F4 practical measurements 31 3 STM32F2 and STM32F4 practical measurements This section only applies to all STM32F2xx, STM32F405, STM32F415, STM32F407 and STM32F417 microcontrollers. This section gives some ADC accuracy measurements, putting the previously described methods into practice. 3.1 Measurement conditions 3.1.1 Hardware setup STM32F407ZGT6 soldered on a test board (with only a minimum number of other hardware components) Ambient temperature: 25°C 3 power supplies are applied to the MCU: VDD/VSS, VDDA/VSSA, VREF+/VREF- Power supply range: VDD=VDDA=VREF+ = 3.3 V, fADC = 36 MHz Clock source: external clock (8 MHz) provided by a generator, PLL is enabled, fCPU = 144 MHz Three fixed analog input voltages are tested: 0.3 V, 1.65 V and 3 V 3.1.2 Firmware setup ADC channel 2 is used in single conversion mode 50000 acquisitions were taken for each fixed analog input voltage Five firmware methods were used to examine the ADC converted data: – Raw data (without averaging) – Averaging of 4 ADC samples – Averaging of 6 ADC samples – Averaging of 8 ADC samples – Averaging of 8 ADC samples and deleting the 4 most dispersed samples Note: All tests were done with fADC = 36 MHz, sampling time = 3 ADC cycles and ADC resolution = 12 bits in order to achieve the fastest ADC conversion (2.4 Msps). 3.2 Results These measurements have been done based on a characterization of the ADC and are confirmed by further investigations (about 100 tests), where many parameters were evaluated to analyze the impact of each one. The following measurements were considered while evaluating the impact of three different ART configurations on the ADC accuracy: ART ON: (data cache + instruction cache + prefetch) ON ART OFF: (data cache + instruction cache + prefetch) OFF (Data cache + instruction cache) ON + prefetch OFF |
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