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Chapter 28 Analog-to-Digital Converter (ADC)
MPC5606BK Microcontroller Reference Manual, Rev. 2
722
Freescale Semiconductor
28.3.3.2
ADC_1
represents the sampling and conversion sequence.
Figure 28-5. Sampling and conversion timings
Table 28-1. ADC sampling and conversion timing at 5 V / 3.3 V for ADC_0
Clock
(MHz)
T
ck
(
s)
INPSAMPLE
1
1
Where: INPSAMPLE
3
Ndelay
2
2
Where: INPSAMP
6, N = 0.5; INPSAMP > 6, N = 1
T
sample
3
3
Where: T
sample
= (INPSAMP-N)T
ck
; Must be
500 ns
T
sample
/T
ck
INPCMP
T
eval
(
s)
INPLATCH
T
conv
(
s)
T
conv
/
T
ck
6
0.167
4
0.5
0.583
3.500
1
1.667
0
2.333 14.000
7
0.143
4
0.5
0.500
3.500
1
1.429
0
2.000 14.000
8
0.125
5
0.5
0.563
4.500
1
1.250
0
1.875 15.000
16
0.063
9
1
0.500
8.000
1
0.625
0
1.188 19.000
32
0.031
17
1
0.500
16.000
2
0.625
1
1.156 37.000
Table 28-2. Max/Min ADC_clk frequency and related configuration settings at 5 V / 3.3 V for ADC_0
INPCMP
INPLATCH
Max f
ADC_clk
Min f
ADC_clk
00/01
0
20 + 4%
6
1
—
—
10
0
—
—
1
32+4%
6
11
0
—
—
1
32 + 4%
9
0.5 cycles
2.5 cycles
Sampling phase
Successive approximation / evaluation phase
10 cycles
Latching phase:
The capacitors field input
switch is opened
Note:
Operating conditions — INPLATCH = 0, INPSAMP = 3, INPCMP = 1 and Fadc clk = 20 MHz
End of conversion
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