Tews Technologies TXMC638, User Manual

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TXMC638 User Manual Issue 1.0.2 Page 45 of 86
ADC Gain Error:
The gain error is the difference between the ideal gain and the actual gain of the programmable gain
amplifier and the ADC. This error is corrected by multiplying the reading with a correction factor.
All calibration data are determined with a common mode voltage of 0V DC. For a reliable correction
for other common mode voltages, a new calibration of the customer environment is expedient.
7.8.3.2 ADC Calibration Data Values
The 24 ADC channels are realized with twelve dual LTC2323-16 ADC devices. For each device and for each
channel respective correction values are stored.
I2C EEPROM
Address
Description
Size
(Bit)
0x000 ADC Channel 1 Offset
corr
High Byte 8
0x001 ADC Channel 1 Offset
corr
Low Byte 8
0x002 ADC Channel 1 Gain
corr
High Byte 8
0x003 ADC Channel 1 Gain
corr
Low Byte 8
0x004 ADC Channel 2 Offset
corr
High Byte 8
0x005 ADC Channel 2 Offset
corr
Low Byte 8
0x006 ADC Channel 2 Gain
corr
High Byte 8
0x007 ADC Channel 2 Gain
corr
Low Byte 8
0x008 ADC Channel 3 Offset
corr
High Byte 8
0x009 ADC Channel 3 Offset
corr
Low Byte 8
0x00A ADC Channel 3 Gain
corr
High Byte 8
0x00B ADC Channel 3 Gain
corr
Low Byte 8
0x00C ADC Channel 4 Offset
corr
High Byte 8
0x00D ADC Channel 4 Offset
corr
Low Byte 8
0x00E ADC Channel 4 Gain
corr
High Byte 8
0x00F ADC Channel 4 Gain
corr
Low Byte 8
…
0x05C ADC Channel 24 Offset
corr
High Byte 8
0x05D ADC Channel 24 Offset
corr
Low Byte 8
0x05E ADC Channel 24 Gain
corr
High Byte 8
0x05F ADC Channel 24 Gain
corr
Low Byte 8
Table 7-11: ADC Calibration Data Values