Datasheet

Table 29. 16-bit ADC operating conditions (continued)
Symbol Description Conditions Min. Typ.
1
Max. Unit Notes
C
rate
ADC conversion
rate
≤ 13-bit modes
No ADC hardware averaging
Continuous conversions
enabled, subsequent
conversion time
20.000 — 818.330 Ksps
5
C
rate
ADC conversion
rate
16-bit mode
No ADC hardware averaging
Continuous conversions
enabled, subsequent
conversion time
37.037 — 461.467 Ksps
5
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 23. ADC input impedance equivalency diagram
6.6.1.2 16-bit ADC electrical characteristics
Peripheral operating requirements and behaviors
K70 Sub-Family Data Sheet, Rev. 5, 10/2013.
52 Freescale Semiconductor, Inc.