AD5940
Data Sheet
ADC CIRCUIT REGISTERS
Table 41. ADC Control Registers Summary
Address
Name
Description
Reset
Access
0x00002044
0x00002074
0x00002078
0x0000207C
0x00002080
0x00002084
0x000020D0
0x00002174
0x000021A8
0x000021F0
0x0000238C
ADCFILTERCON
ADCDAT
ADC output filters configuration register
ADC raw result register
0x00000301
0x00000000
0x00000000
0x00000000
0x00000000
0x00000000
0x00000090
0x00000000
0x00000000
0x00000160
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
R/W
DFTREAL
DFT result, real device register
DFT result, imaginary device register
Sinc2 filter result register
DFTIMAG
SINC2DAT
TEMPSENSDAT
DFTCON
Temperature sensor result register
DFT configuration register
TEMPSENS
ADCCON
Temperature sensor configuration register
ADC configuration register
REPEATADCCNV
ADCBUFCON
Repeat ADC conversion control register
ADC buffer configuration register
0x005F3D00 R/W
ADC Output Filters Configuration Register—ADCFILTERCON
Address 0x00002044, Reset: 0x00000301, Name: ADCFILTERCON
Table 42. Bit Descriptions for ADCFILTERCON Register
Bits
Bit Name
Settings Description
Reset Access
[31:19] Reserved
Reserved.
0x0
0x0
R
18
17
16
DFTCLKENB
DFT clock enable.
Enable.
Disable.
0
1
DACWAVECLKENB
SINC2CLKENB
DAC wave clock enable.
Enable.
Disable.
0x0
0x0
0
1
Sinc2 filter clock enable.
Enable.
Disable.
0
1
[15:14] AVRGNUM
These bits set the number of samples used by the averaging function. The average 0x0
output is fed directly to the DFT block and the DFT source is automatically
changed to the average output. The AVRGEN bit must be set to 1 to use these
bits.
R/W
0
1
2 ADC samples used for the average function.
4 ADC samples used for the average function.
10 8 ADC samples used for the average function.
11 16 ADC samples used for the average function.
Sinc3 filter oversampling rate.
[13:12] SINC3OSR
0x0
R/W
Oversampling rate of 5. Use this setting for the 160 kHz sinc3 filter output
update rate and when the ADC update rate is 800 kSPS (default).
Oversampling rate of 4. Use this setting for the 400 kHz sinc3 filter output
update rate and when the ADC update rate is 1.6 MSPS. High power option.
0
1
Oversampling rate of 2. Use this setting for the 400 kHz sinc3 filter output
10 update rate and when the ADC update rate is 800 kSPS.
Oversampling rate of 5. Use this setting for the 160 kHz sinc3 filter output
11 update rate and when the ADC update rate is 800 kSPS.
[11:8]
SINC2OSR
Sinc2 oversampling rate (OSR).
0x3
R/W
0
1
22 samples for this OSR setting.
44 samples for this OSR setting.
10 89 samples for this OSR setting.
11 178 samples for this OSR setting.
100 267 samples for this OSR setting.
101 533 samples for this OSR setting.
110 640 samples for this OSR setting.
Rev. 0 | Page 54 of 130
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