参数资料
型号: ADUC845BCPZ8-3
厂商: ANALOG DEVICES INC
元件分类: 微控制器/微处理器
英文描述: 8-BIT, FLASH, 12.58 MHz, MICROCONTROLLER, QCC56
封装: 8 X 8 MM, LEAD FREE, MO-220-VLLD-2, LFCSP-56
文件页数: 50/108页
文件大小: 1940K
代理商: ADUC845BCPZ8-3
ADuC845/ADuC847/ADuC848
Rev. B | Page 46 of 108
r the ADC, an
SFR Bit Designations
SF.7
SF.6
SF.5
SF.4
SF.
SF.0
SF (ADC SINC FILTER CONTROL REGISTER)
The SF register is used to configure the decimation factor fo
SFR Address:
D4H
Power-On Default:
45H
d therefore, has a direct influence on the ADC throughput rate.
3
SF.2
SF.1
Bit Addressable:
No
Table 28. Sinc Filter
0
1
0
1
0
1
The bits in this register set the decimation factor of the ADC. This has a d
chop setting. The equations used to determine the ADC throughput rate a
Fadc (Chop On
irect bearing on the throughput rate of the ADC along with the
re
) =
SFword
×
× 8
3
1
× 32.768 kHz
where SFword is in decimal.
Fadc (Chop Off) =
SFword
×
8
1
× 32.768 kHz
where SFword is in decimal.
Table 29. SF SFR Bit Examples
Chop Enabled (ADCMODE.3 = 0)
SF (Decimal)
SF (Hexadecimal)
Fadc (Hz)
Tadc (ms)
Tsettle (ms)
131
0D
105.3
9.52
19.04
69
45
19.79
50.53
101.1
82
52
16.65
60.06
120.1
255
FF
5.35
186.77
373.54
Chop Disabled (ADCMODE.3 = 1)
SF (Decimal)
SF (Hexadecimal)
Fadc (Hz)
Tadc (ms)
Tsettle (ms)
3
03
1365.3
0.73
2.2
69
45
59.36
16.84
50.52
82
52
49.95
20.02
60.06
255
FF
16.06
62.25
186.8
1 With chop enabled, if an SF word smaller than 13 is written to this SF reg
During ADC calibration, the user-programmed value of SF wor
did on previou
ister, the filter au
d is used.
s MicroConverter products. However, for optimum calibrat
t.
tomatically defaults to 13.
The SF word does not default to the maximum setting (255) as it
ion results, it is recommended that the maximum SF word be se
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