Omega Engineering PCI-DAS1200 manual Calibration Register, DAC Channel Cal Function, Cal Source

7.3.4 CALIBRATION REGISTER

As mentioned before, direct register level programming should be attempted only by extremely experienced register level programmers. This is true for register-level calibration. If you’re not sure, don’t attempt it. Call Technical Support for more information.

BADR1 + 6

This register controls all autocal operations. This is a Write-only register.

WRITE

15	14	13	12	11	10	9	8	7	6	5	4	3	2	1	0
SDI	CALEN	CSRC2	CSRC1	CSRC0	-	SEL7376	SEL8800	-	-	-	-	-	-	-	-

SEL8800 This bit enables the 8-bit trim DACs for the following circuits:

DAC Channel	Cal Function
0	DAC0 Fine Gain
1	DAC0 Coarse Gain
2	DAC0 Offset
3	DAC1 Offset
4	DAC1 Fine Gain
5	DAC1 Coarse Gain
6	ADC Coarse Offset
7	ADC Fine Offset

SEL7376 This bit latches the 7-bit serial data stream into the AD7376 digital potentiometer (10KOhm). The AD7376 is used for analog front-end gain calibration.

CSRC[2:0] These bits select the different calibration sources available to the ADC front end.

CSRC2	CSRC1	CSRC0	Cal Source
0	0	0	AGND
0	0	1	7.0V
0	1	0	3.5V
0	1	1	1.75V
1	0	0	0.875V
1	0	1	8.6mV
1	1	0	VDAC0
1	1	1	VDAC1

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