RM0401 Rev 3 223/771
RM0401 Analog-to-digital converter (ADC)
242
Figure 36. Right alignment of 12-bit data
Figure 37. Left alignment of 12-bit data
Special case: when left-aligned, the data are aligned on a half-word basis except when the
resolution is set to 6-bit. in that case, the data are aligned on a byte basis as shown in
Figure 38.
Figure 38. Left alignment of 6-bit data
11.5 Channel-wise programmable sampling time
The ADC samples the input voltage for a number of ADCCLK cycles that can be modified
using the SMP[2:0] bits in the ADC_SMPR1 and ADC_SMPR2 registers. Each channel can
be sampled with a different sampling time.
The total conversion time is calculated as follows:
T
conv
= Sampling time + 12 cycles
Example:
With ADCCLK = 30 MHz and sampling time = 3 cycles:
T
conv
= 3 + 12 = 15 cycles = 0.5 µs with APB2 at 60 MHz
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