ADUC847 Analog Devices, ADUC847 Datasheet - Page 46

• Manufacturer Part Number: ADUC847
• Description: Precision Analog Microcontroller: 12MIPS 8052 Flash MCU + 10-Ch 24-Bit ADC + 12-Bit DAC
• Manufacturer: Analog Devices

Specifications of ADUC847

• Mcu Core: 8052
• Mcu Speed (mips): 12
• Sram (bytes): 2304Bytes
• Gpio Pins: 34
• Adc # Channels: 10
• Other: PWM

ADuC845/ADuC847/ADuC848
SF (ADC SINC FILTER CONTROL REGISTER)
The SF register is used to configure the decimation factor fo
SFR Address:
Power-On Default:
Bit Addressable:
Table 28. Sinc Filter
SF.7
0
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
where SFword is in decimal.
Fadc (Chop Off) =
where SFword is in decimal.
Table 29. SF SFR Bit Examples
Chop Enabled (ADCMODE.3 = 0)
SF (Decimal)
13
69
82
255
Chop Disabled (ADCMODE.3 = 1)
SF (Decimal)
3
69
82
255
1
During ADC calibration, the user-programmed value of SF wor
did on previou
With chop enabled, if an SF word smaller than 13 is written to this SF reg
1
s MicroConverter® products. However, for optimum calibrat
) =
SF (Hexadecimal)
0D
45
52
FF
SF (Hexadecimal)
03
45
52
FF
SF.6
1
3
8
× 8
×
SFR Bit Designations
SFword
D4H
45H
No
×
1
SFword
1
× 32.768 kHz
× 32.768 kHz
SF.5
0
Fadc (Hz)
105.3
19.79
16.65
5.35
Fadc (Hz)
1365.3
59.36
49.95
16.06
Tadc (ms)
9.52
50.53
60.06
Tadc (ms)
0.73
16.84
20.02
186.77
62.25
SF.4
0
r the ADC, an
Rev. B | Page 46 of 108
ister, the filter au
Tsettle (ms)
19.04
101.1
120.1
373.54
Tsettle (ms)
2.2
50.52
60.06
186.8
d is used.
SF.
0
ion results, it is recommended that the maximum SF word be se
3
The SF word does not default to the maximum setting (255) as it
irect bearing on the throughput rate of the ADC along with the
d therefore, has a direct influence on the ADC throughput rate.
re
tomatically defaults to 13.
SF.2
1
0
SF.1
SF.0
1
t.