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| 型号： | MK20DX128ZVMD10 |
| 厂商： | FREESCALE SEMICONDUCTOR INC |
| 元件分类： | 微控制器/微处理器 |
| 英文描述： | 32-BIT, FLASH, 100 MHz, RISC MICROCONTROLLER, PBGA144 |
| 封装： | 13 X 13 MM, MAPBGA-144 |
| 文件页数： | 39/74页 |
| 文件大小： | 1023K |
| 代理商： | MK20DX128ZVMD10 |
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6.6.1.3 16-bit ADC with PGA operating conditions
Table 29. 16-bit ADC with PGA operating conditions
Symbol
Description
Conditions
Min.
Max.
Unit
Notes
VDDA
Supply voltage
Absolute
1.71
—
3.6
V
VREFPGA PGA ref voltage
VREF_OU
T
VREF_OU
T
VREF_OU
T
V
VADIN
Input voltage
VSSA
—
VDDA
V
VCM
Input Common
Mode range
VSSA
—
VDDA
V
RPGAD
Differential 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
Crate
ADC conversion
rate
≤ 13 bit modes
No ADC hardware
averaging
Continuous
conversions enabled
Peripheral clock = 50
MHz
18.484
—
450
Ksps
16 bit modes
No ADC hardware
averaging
Continuous
conversions enabled
Peripheral clock = 50
MHz
37.037
—
250
Ksps
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 (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 RPGAD/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.
7. ADC clock = 18 MHz, ADLSMP = 1, ADLST = 00, ADHSC = 1
8. ADC clock = 12 MHz, ADLSMP = 1, ADLST = 01, ADHSC = 1
Peripheral operating requirements and behaviors
K20 Sub-Family Data Sheet Data Sheet, Rev. 5, 5/2011.
44
Preliminary
Freescale Semiconductor, Inc.
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