34.4.5.6 Conversion time examples
The following examples use
and the information provided in
through
.
34.4.5.6.1 Typical conversion time configuration
A typical configuration for ADC conversion is: 10-bit mode, with the bus clock selected
as the input clock source, the input clock divide-by-1 ratio selected, and a bus frequency
of 8 MHz, long sample time disabled and high speed conversion disabled. The
conversion time for a single conversion is calculated by using
information provided in
variables of
Table 34-112. Typical conversion time
Variable
Time
SFCAdder
5 ADCK 5 bus clock cycles
AverageNum
1
BCT
20 ADCK cycles
LSTAdder
0
HSCAdder
0
The resulting conversion time is generated using the parameters listed in the proceeding
table. Therefore, for a bus clock equal to 8 MHz and an ADCK equal to 8 MHz the
resulting conversion time is 3.75 µs.
34.4.5.6.2 Long conversion time configuration
A configuration for long ADC conversion is: 16-bit differential mode with the bus clock
selected as the input clock source, the input clock divide-by-8 ratio selected, a bus
frequency of 8 MHz, long sample time enabled, configured for longest adder, high speed
conversion disabled, and average enabled for 32 conversions. The conversion time for
this conversion is calculated by using
and the information provided in
. The following table lists the variables of the
.
Table 34-113. Typical conversion time
Variable
Time
SFCAdder
3 ADCK 5 bus clock cycles
AverageNum
32
BCT
34 ADCK cycles
LSTAdder
20 ADCK cycles
Table continues on the next page...
Functional description
K53 Sub-Family Reference Manual, Rev. 6, Nov 2011
846
Freescale Semiconductor, Inc.
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