Datasheet
Table 30. 16-bit ADC with PGA operating conditions (continued)
Symbol Description Conditions Min. Typ.
1
Max. Unit Notes
16 bit modes
No ADC hardware
averaging
Continuous conversions
enabled
Peripheral clock = 50
MHz
37.037 — 250 Ksps 8
1. Typical values assume V
DDA
= 3.0 V, Temp = 25°C, f
ADCK
= 6 MHz unless otherwise stated. Typical values are for
reference only and are not tested in production.
2. ADC must be configured to use the internal voltage reference (VREF_OUT)
3. PGA reference is internally connected to the VREF_OUT pin. If the user wishes to drive VREF_OUT with a voltage other
than the output of the VREF module, the VREF module must be disabled.
4. For single ended configurations the input impedance of the driven input is R
PGAD
/2
5. The analog source resistance (R
AS
), external to MCU, should be kept as minimum as possible. Increased R
AS
causes drop
in PGA gain without affecting other performances. This is not dependent on ADC clock frequency.
6. The minimum sampling time is dependent on input signal frequency and ADC mode of operation. A minimum of 1.25µs
time should be allowed for F
in
=4 kHz at 16-bit differential mode. Recommended ADC setting is: ADLSMP=1, ADLSTS=2 at
8 MHz ADC clock.
7. ADC clock = 18 MHz, ADLSMP = 1, ADLST = 00, ADHSC = 1
8. ADC clock = 12 MHz, ADLSMP = 1, ADLST = 01, ADHSC = 1
6.6.1.4 16-bit ADC with PGA characteristics
Table 31. 16-bit ADC with PGA characteristics
Symbol Description Conditions Min. Typ.
1
Max. Unit Notes
I
DDA_PGA
Supply current Low power
(ADC_PGA[PGALPb]=0)
— 420 644 μA 2
I
DC_PGA
Input DC current A 3
Gain =1, V
REFPGA
=1.2V,
V
CM
=0.5V
— 1.54 — μA
Gain =64, V
REFPGA
=1.2V,
V
CM
=0.1V
— 0.57 — μA
G Gain
4
• PGAG=0
• PGAG=1
• PGAG=2
• PGAG=3
• PGAG=4
• PGAG=5
• PGAG=6
0.95
1.9
3.8
7.6
15.2
30.0
58.8
1
2
4
8
16
31.6
63.3
1.05
2.1
4.2
8.4
16.6
33.2
67.8
R
AS
< 100Ω
BW Input signal
bandwidth
• 16-bit modes
• < 16-bit modes
—
—
—
—
4
40
kHz
kHz
Table continues on the next page...
Peripheral operating requirements and behaviors
K60 Sub-Family, Rev5, 10/2013.
Freescale Semiconductor, Inc. 51