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PIC24F Family Reference Manual
DS39737A-page 49-18 Preliminary © 2010 Microchip Technology Inc.
Figure 49-8: 2-Channel Simultaneous Sampling (ASAM = 1)
For simultaneous sampling, the total time taken to sample and convert the channels is shown by
Equation 49-3.
Equation 49-3: Channel Sample and Conversion Total Time, Simultaneous Sampling
Selected
Sample 1
Sample 1
CH0
CH1
Convert 1
Convert 1
SOC
Trigger
Sample 2
Sample 2
Convert 2
Convert 2
Sample/Convert Sequence 1
Sample/Convert Sequence 2
1
2 4
3
5
Note 1: The CH0-CH1 input multiplexer selects the analog input for sampling. The selected
analog input is connected to the sample capacitor.
2: On the SOC Trigger, CH0-CH1 samples capacitor is disconnected from the multiplexer
to simultaneously sample the analog inputs. The analog value captured in CH0 is
converted to equivalent digital bits.
3: The analog voltage captured in CH1 is converted to equivalent digital bits.
4: The CH0-CH1 input multiplexer selects the next analog input for sampling. The selected
analog input is connected to the sample capacitor.
5: On SOC Trigger, CH0-CH1 samples capacitor is disconnected from the multiplexer to
simultaneously sample the analog inputs. The analog value captured in CH0 is
converted to equivalent digital bits.
TSIM TSIM
Where:
TSIM = Total time to sample and convert multiple channels with simultaneous sampling.
TSMP = Sampling time (see Equation 49-1)
T
CONV = Conversion time (see Equation 49-2)
M = Number of channels selected by the CHPS<1:0> bits.
T
SIM = TSMP + (M • TCONV)
Protego_Release_01_05-Related-OEM-Documentation-PIC24FJ32MC10X-Reference_Manual-Section49-10-Bit_ADC_with_4_Simultaneous_Conversions.pdf