Datasheet

Table 28. 16-bit ADC operating conditions
Symbol Description Conditions Min. Typ.
1
Max. Unit Notes
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. To achieve the best results, the analog source resistance must be kept as low as
possible. The results in this data sheet were derived from a system that had < 8 Ω analog source resistance. The R
AS
/C
AS
time constant should be kept to < 1 ns.
4. To use the maximum ADC conversion clock frequency, CFG2[ADHSC] must be set and CFG1[ADLPC] must be clear.
5. For guidelines and examples of conversion rate calculation, download the ADC calculator tool.
R
AS
V
AS
C
AS
Z
AS
V
ADIN
Z
ADIN
R
ADIN
R
ADIN
R
ADIN
R
ADIN
C
ADIN
Pad
leakage
due to
input
protection
INPUT PININPUT PIN
INPUT PIN
INPUT PIN
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
ADC SAR
ENGINE
Figure 20. ADC input impedance equivalency diagram
6.6.1.2 16-bit ADC electrical characteristics
Table 29. 16-bit ADC characteristics (V
REFH
= V
DDA
, V
REFL
= V
SSA
)
Symbol Description Conditions
1
. Min. Typ. Max. Unit Notes
I
DDA_ADC
Supply current 0.215 — 1.7 mA 3
f
ADACK
ADC
asynchronous
clock source
• ADLPC = 1, ADHSC = 0
• ADLPC = 1, ADHSC = 1
1.2
2.4
3.0
2.4
4.0
5.2
3.9
6.1
7.3
MHz
MHz
MHz
t
ADACK
= 1/
f
ADACK
Table continues on the next page...
Peripheral operating requirements and behaviors
K60 Sub-Family, Rev5, 10/2013.
Freescale Semiconductor, Inc. 47