Peripheral operating requirements and behaviors
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
ZADIN
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
Pad
ZAS
leakage
due to
input
ADC SAR
ENGINE
RAS
RADIN
protection
VADIN
CAS
VAS
RADIN
RADIN
RADIN
INPUT PIN
INPUT PIN
INPUT PIN
CADIN
Figure 6. ADC input impedance equivalency diagram
6.6.1.2 12-bit ADC electrical characteristics
Table 20. 12-bit ADC characteristics (VREFH = VDDA, VREFL = VSSA
)
Symbol Description
Conditions1
Min.
0.215
1.2
Typ.2
Max.
1.7
3.9
6.1
7.3
9.5
Unit
Notes
IDDA_ADC Supply current
—
mA
3
ADC
asynchronous
• ADLPC = 1, ADHSC = 0
• ADLPC = 1, ADHSC = 1
• ADLPC = 0, ADHSC = 0
• ADLPC = 0, ADHSC = 1
2.4
4.0
5.2
6.2
tADACK = 1/
fADACK
MHz
MHz
MHz
MHz
2.4
clock source
fADACK
3.0
4.4
Sample Time
See Reference Manual chapter for sample times
TUE
DNL
Total unadjusted
error
• 12-bit modes
• <12-bit modes
—
—
4
6.8
2.1
LSB4
LSB4
5
5
1.4
Differential non-
linearity
• 12-bit modes
—
0.7
-1.1 to +1.9
-0.3 to 0.5
• <12-bit modes
• 12-bit modes
—
—
0.2
1.0
INL
EFS
Integral non-
linearity
-2.7 to +1.9
-0.7 to +0.5
LSB4
LSB4
5
• <12-bit modes
• 12-bit modes
• <12-bit modes
—
—
—
0.5
-4
Full-scale error
-5.4
-1.8
VADIN =
VDDA
-1.4
5
Table continues on the next page...
KL24 Sub-Family Data Sheet Data Sheet, Rev. 3, 9/19/2012.
32
Freescale Semiconductor, Inc.
FREESCALE [ Freescale ]
