K20P81M100SF2_1109 Datasheet, PDF (41/75 Pages) Freescale Semiconductor, Inc – K20 Sub-Family Data Sheet

6.6.1 ADC electrical specifications
Peripheral operating requirements and behaviors
The 16-bit accuracy specifications listed in Table 27 and Table 28 are achievable on the
differential pins ADCx_DP0, ADCx_DM0, ADCx_DP1, ADCx_DM1, ADCx_DP3, and
ADCx_DM3.
The ADCx_DP2 and ADCx_DM2 ADC inputs are connected to the PGA outputs and are
not direct device pins. Accuracy specifications for these pins are defined in Table 29 and
Table 30.
All other ADC channels meet the 13-bit differential/12-bit single-ended accuracy
specifications.
6.6.1.1 16-bit ADC operating conditions
Table 27. 16-bit ADC operating conditions
Symbol Description
V_DDA Supply voltage
ΔV_DDA Supply voltage
ΔV_SSA Ground voltage
V_REFH
V_REFL
V_ADIN
C_ADIN
ADC reference
voltage high
Reference
voltage low
Input voltage
Input
capacitance
Conditions
Absolute
Delta to V_DD (V_DD-
V_DDA)
Delta to V_SS (V_SS-
V_SSA)
• 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
R_ADIN
R_AS
Input resistance
Analog source
resistance
13/12 bit modes
f_ADCK < 4MHz
—
2
5
kΩ
—
—
5
kΩ
f_ADCK
ADC conversion ≤ 13 bit modes
clock frequency
1.0
—
18.0
f_ADCK
ADC conversion 16 bit modes
clock frequency
2.0
—
12.0
Table continues on the next page...
MHz
MHz
Notes
2
2
3
4
4
K20 Sub-Family Data Sheet Data Sheet, Rev. 6, 9/2011.
Freescale Semiconductor, Inc.
41