AD5940
Data Sheet
ADC Offset Calibration Auxiliary Input Channel (PGA Gain = 9) Register—ADCOFFSETGN9
Address 0x000022D0, Reset: 0x00000000, Name: ADCOFFSETGN9
The ADCOFFSETGN9 register provides ADC input offset calibration with PGA gain = 9.
Table 67. Bit Descriptions for ADCOFFSETGN9 Register
Bits
Bit Name
Reserved
Value
Settings
Description
Reset
0x0
Access
R
[31:15]
[14:0]
Reserved.
Offset calibration gain = 9. ADC offset correction with PGA gain = 9.
4095.75. Maximum positive offset calibration value.
0.25. Minimum positive offset calibration value.
0. No offset adjustment.
−0.25. Minimum Negative Offset calibration value.
−4096. Maximum Negative Offset calibration value.
0x0
R/W
0x3FFF
0x0001
0x0000
0x7FFF
0x4000
ADC Gain Calibration Auxiliary Input Channel (PGA Gain = 9) Register—ADCGAINGN9
Address 0x00002298, Reset: 0x00004000, Name: ADCGAINGN9
The ADCGAINGN9 register provides gain calibration for the voltage input channels to the ADC, including the AINx channels, when the
PGA is enabled with gain = 9.
Table 68. Bit Descriptions for ADCGAINGN9 Register
Bits
[31:15] Reserved
[14:0] Value
Bit Name
Settings Description
Reset
Access
Reserved.
0x0
R
Gain calibration for PGA gain = 9. These bits provide ADC gain correction for the
0x4000 R/W
auxiliary input channels. These bits are used for all channels except the TIA and
temperature sensor channels when PGA gain = 9. This value is stored as a signed
number. Bit 14 is the sign bit and Bits[13:0] represent the fractional part.
0x0000 0. Illegal value resulting in an ADC result of 0.
0x2000 0.5. ADC result multiplied by 0.5.
0x4000 1.0. ADC result multiplied by 1. No gain adjustment (default value).
0x4001 1.000061. Minimum positive gain adjustment.
0x7FFF 2. Maximum positive gain adjustment.
0x0001 0.000061. Maximum negative gain adjustment.
0x3FFF 0.999939. Minimum negative gain adjustment.
ADC Offset Calibration Temperature Sensor Channel Register—ADCOFFSETTEMPSENS
Address 0x0000223C, Reset: 0x00000000, Name: ADCOFFSETTEMPSENS
Table 69. Bit Descriptions for ADCOFFSETTEMPSENS
Bits
[31:15] Reserved
[14:0] Value
Bit Name Settings Description
Reset Access
Reserved.
0x0
0x0
R
Offset calibration for the temperature sensor. These bits provide ADC offset correction for
the temperature sensor channel, represented as a twos complement number. The
calibration resolution is 0.25 LSB of the ADCDAT LSB size. Therefore, the calibration
resolution is VREF/218. If VREF = 1.82 V, the calibration resolution is: 1.82/217 = 13.73 µV.
R/W
0x3FFF 4095.75. Maximum positive offset calibration value.
0x0001 0.25. Minimum positive offset calibration value.
0x0000 0. No offset adjustment.
0x7FFF −0.25. Minimum negative offset calibration value.
0x4000 −4096. Maximum negative offset calibration value.
Rev. 0 | Page 64 of 130
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