K40P100M100SF2V2 Datasheet, PDF (35/70 Pages) Freescale Semiconductor, Inc – K40 Sub-Family

6.6.1.1
Peripheral operating requirements and behaviors
16-bit ADC operating conditions
Table 25. 16-bit ADC operating conditions
Symbol
V_DDA
ΔV_DDA
ΔV_SSA
V_REFH
V_REFL
V_ADIN
C_ADIN
Description
Conditions
Supply voltage Absolute
Supply voltage
Ground voltage
ADC reference
voltage high
Delta to V_DD (V_DD-V_DDA)
Delta to V_SS (V_SS-V_SSA)
Reference
voltage low
Input voltage
Input capacitance • 16 bit modes
• 8/10/12 bit modes
Min.
1.71
-100
-100
1.13
V_SSA
V_REFL
—
—
Typ.¹
—
0
0
V_DDA
V_SSA
—
8
4
Max.
3.6
+100
+100
V_DDA
V_SSA
V_REFH
10
5
Unit
V
mV
mV
V
V
V
pF
Notes
2
2
R_ADIN
R_AS
Input resistance
Analog source
resistance
13/12 bit modes
f_ADCK < 4MHz
—
2
5
kΩ
3
—
—
5
kΩ
f_ADCK
ADC conversion ≤ 13 bit modes
clock frequency
4
1.0
—
18.0
MHz
f_ADCK
ADC conversion 16 bit modes
clock frequency
4
2.0
—
12.0
MHz
C_rate ADC conversion ≤ 13 bit modes
5
rate
No ADC hardware averaging 20.000
—
818.330
Ksps
Continuous conversions
enabled, subsequent
conversion time
C_rate ADC conversion 16 bit modes
5
rate
No ADC hardware averaging 37.037
—
461.467
Ksps
Continuous conversions
enabled, subsequent
conversion time
1. Typical values assume V_DDA = 3.0 V, Temp = 25°C, f_ADCK = 1.0 MHz unless otherwise stated. Typical values are for
reference only and are not tested in production.
2. DC potential difference.
3. This resistance is external to MCU. The analog source resistance should be kept as low as possible in order to achieve the
best results. The results in this datasheet were derived from a system which has <8 Ω analog source resistance. The R_AS/
C_AS time constant should be kept to <1ns.
4. To use the maximum ADC conversion clock frequency, the ADHSC bit should be set and the ADLPC bit should be clear.
5. For guidelines and examples of conversion rate calculation, download the ADC calculator tool: http://cache.freescale.com/
files/soft_dev_tools/software/app_software/converters/ADC_CALCULATOR_CNV.zip?fpsp=1
K40 Sub-Family Data Sheet, Rev. 1, 6/2012.
Freescale Semiconductor, Inc.
Preliminary
35
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