XMC4500
XMC4000 Family
Electrical Parameters
Conversion Time
Table 22
Conversion Time (Operating Conditions apply)
Parameter
Symbol Values
Unit Note
Conversion
time
tC CC 2 × TADC
+
μs
N = 8, 10, 12 for
N-bit conversion
(2 + N + STC + PC +DM) × TADCI
T
T
ADC = 1 / fPERIPH
ADCI = 1 / fADCI
•
•
•
STC defines additional clock cycles to extend the sample time
PC adds two cycles if post-calibration is enabled
DM adds one cycle for an extended conversion time of the MSB
Conversion Time Examples
System assumptions:
f
ADC = 120 MHz i.e. tADC = 8.33 ns, DIVA = 3, fADCI = 30 MHz i.e. tADCI = 33.3 ns
According to the given formulas the following minimum conversion times can be
achieved (STC = 0, DM = 0):
12-bit post-calibrated conversion (PC = 2):
t
CN12C = (2 + 12 + 2) × tADCI + 2 × tADC = 16 × 33.3 ns + 2 × 8.33 ns = 550 ns
12-bit uncalibrated conversion:
CN12 = (2 + 12) × tADCI + 2 × tADC = 14 × 33.3 ns + 2 × 8.33 ns = 483 ns
10-bit uncalibrated conversion:
CN10 = (2 + 10) × tADCI + 2 × tADC = 12 × 33.3 ns + 2 × 8.33 ns = 417 ns
8-bit uncalibrated:
CN8 = (2 + 8) × tADCI + 2 × tADC = 10 × 33.3 ns + 2 × 8.33 ns = 350 ns
t
t
t
Data Sheet
46
V1.0, 2013-01
Subject to Agreement on the Use of Product Information
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