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7.3.4 CALIBRATION REGISTER
See "Calibrating The PCI-DAS1000" document for additional programming details.
BADR1 + 6
This register controls all autocal operations. This is a Write-only register.
WRITE
15
14
13
12
SDI
CALEN
CSRC2
CSRC1
SEL8800
This bit enables the 8-bit trim DACs for the following circuits:
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.
CALEN
This bit is used to enable Cal Mode.
1 = Selected Cal Source, CSRC[2:0], is fed into Analog Channel 0.
0 = Analog Channel 0 functions as normal input.
SDI
Serial Data In. This bit is used to set serial address/data stream for the
DAC8800 TrimDac and 7376 digital potentiometer. Used in conjunction
with SEL8800 and SEL7376 bits.
11
10
9
8
CSRC0
-
SEL7376
SEL8800
DAC Channel
0
1
2
3
4
5
6
7
CSRC2
CSRC1
0
0
0
0
0
1
0
1
1
0
1
0
1
1
1
1
7
6
5
4
-
-
-
-
Cal Function
DAC0 Fine Gain
DAC0 Coarse Gain
DAC0 Offset
DAC1 Offset
DAC1 Fine Gain
DAC1 Coarse Gain
ADC Coarse Offset
ADC Fine Offset
CSRC0
Cal Source
0
AGND
1
7.0V
0
3.5V
1
1.75V
0
0.875V
1
8.6mV
0
VDAC0
1
VDAC1
23
3
2
1
0
-
-
-
-
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