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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
--------
SEL8800SEL7376-CSRC0CSRC1CSRC2CALENSDI
0123456789101112131415
SEL8800
This bit enables the 8-bit trim DACs for the following circuits:
ADC
Fine Offset
7
ADC
Coarse
Offset
6
DAC1
Coarse Gain
5
DAC1
Fine Gain
4
DAC1
Offset
3
DAC0
Offset
2
DAC0
Coarse Gain
1
DAC0
Fine Gain
0
Cal Function DAC Channel
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.
VDAC1111
VDAC0011
8.6mV101
0.875V001
1.75V110
3.5V010
7.0V100
AGND000
Cal SourceCSRC0CSRC1CSRC2
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.
23