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参数资料
| 型号： | MK20X256VMC100 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | FLASH, 100 MHz, RISC MICROCONTROLLER, PBGA121 |
| 封装： | 8 X 8 MM, MAPBGA-121 |
| 文件页数： | 38/68页 |
| 文件大小： | 1818K |
| 代理商： | MK20X256VMC100 |
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Table 26. 16-bit ADC with PGA operating conditions (continued)
Symbol
Description
Conditions
Min.
Max.
Unit
Notes
RPGAD
Differntial input
impedance
Gain = 1, 2, 4, 8
Gain = 16, 32
Gain = 64
—
128
64
32
—
kΩ
IN+ to IN-4
RAS
Analog source
resistance
—
100
—
Ω
TS
ADC sampling
time
1.25
—
s
1. Typical values assume VDDA = 3.0 V, Temp = 25°C, fADCK = 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 (VREFOUT)
3. PGA reference connected to the VREFOUT pin. If the user wishes to drive VREFOUT with a voltage other than the output
of the VREF module, the VREF module must be disabled.
4. For single ended configurations the input impedence of the driven input is 1/2.
5. The analog source resistance (RAS), external to MCU, should be kept as minimum as possible. Increased RAS 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 1.25s
time should be allowed for Fin=4 kHz at 16-bit differential mode. Recommended ADC setting is: ADLSMP=1, ADLSTS=2 at
8 MHz ADC clock.
6.6.1.4 16-bit ADC with PGA characteristics
Table 27. 16-bit ADC with PGA characteristics
Symbol
Description
Conditions
Min.
Typ.1
Max.
Unit
Notes
IDDA_PGA
Supply current
—
590
TBD
μA
IDC_PGA
Input DC current
A
IILKG
Input Leakage
current
PGA disabled
—
TBD
μA
G
Gain4
PGAG=0
PGAG=1
PGAG=2
PGAG=3
PGAG=4
PGAG=5
PGAG=6
TBD
0.98
1.99
3.97
7.95
15.8
31.4
61.2
TBD
RAS < 100Ω
BW
Input signal
bandwidth
16-bit modes
< 16-bit modes
—
4
40
kHz
PSRR
Power supply
rejection ration
Gain=1
TBD
—
dB
VDDA= 3V
±100mV,
fVDDA= 50Hz,
60Hz
Table continues on the next page...
Peripheral operating requirements and behaviors
K20 Sub-Family Data Sheet Data Sheet, Rev. 4, 3/2011.
Freescale Semiconductor, Inc.
Preliminary
43
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