Peripheral operating requirements and behaviors
Table 27. 16-bit ADC operating conditions (continued)
Symbol
Crate
Description
ADC conversion
rate
Conditions
16-bit mode
No ADC hardware averaging
Continuous conversions
enabled, subsequent
conversion time
Min.
37.037
Typ.1
Max.
Unit
—
461.467
Ksps
Notes
5
1. Typical values assume VDDA = 3.0 V, Temp = 25 °C, fADCK = 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 RAS/CAS
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.
ZAS
RAS
SIMPLIFIED
INPUT PIN EQUIVALENT
CIRCUIT
Pad
leakage
due to
input
protection
ZADIN
SIMPLIFIED
CHANNEL SELECT
CIRCUIT
RADIN
ADC SAR
ENGINE
VADIN
VAS
CAS
INPUT PIN
INPUT PIN
INPUT PIN
RADIN
RADIN
RADIN
CADIN
Figure 12. ADC input impedance equivalency diagram
6.6.1.2 16-bit ADC electrical characteristics
Table 28. 16-bit ADC characteristics (VREFH = VDDA, VREFL = VSSA)
Symbol Description
Conditions1.
Min.
Typ.2
Max.
Unit
IDDA_ADC Supply current
0.215
—
1.7
mA
Table continues on the next page...
Notes
3
K10 Sub-Family Data Sheet, Rev. 3, 6/2013.
Freescale Semiconductor, Inc.
39