K20P120M100SF2 Datasheet, PDF (37/66 Pages) Freescale Semiconductor, Inc – K20 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
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)
ADC reference
voltage low
Input voltage
Input capacitance • 16-bit mode
• 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
R_ADIN
R_AS
Input resistance
Analog source
resistance
13-/12-bit modes
f_ADCK < 4 MHz
—
2
5
—
—
5
f_ADCK
f_ADCK
C_rate
C_rate
ADC conversion
clock frequency
ADC conversion
clock frequency
ADC conversion
rate
ADC conversion
rate
≤ 13-bit mode
16-bit mode
≤ 13 bit modes
No ADC hardware averaging
Continuous conversions
enabled, subsequent
conversion time
16-bit mode
No ADC hardware averaging
Continuous conversions
enabled, subsequent
conversion time
1.0
2.0
20.000
37.037
—
18.0
—
12.0
—
818.330
—
461.467
Unit
V
mV
mV
V
V
V
pF
kΩ
kΩ
MHz
MHz
Ksps
Ksps
Notes
2
2
3
4
4
5
5
K20 Data Sheet Data Sheet, Rev. 6.1, 08/2012.
Freescale Semiconductor, Inc.
37