Low-Cost Precision Sensor

Signal Conditioner

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17

Table 3. Configuration Register (CONFIG[15:0])

FIELD

NAME

DESCRIPTION

15:13

OSC[2:0]

Oscillator frequency setting. Factory preset, do not change.

12

11

CLK1M EN

Logic ‘1’ enables CLK1M output driver.

10

PGA Sign

Logic ‘1’ inverts INM and INP polarity.

9

IRO Sign

Logic ‘1’ for positive input referred offset (IRO). Logic ‘0’ for negative input referred offset (IRO).

8:6

IRO[2:0]

Input referred coarse offset adjustment.

5:2

PGA[3:0]

Programmable gain amplifier setting.

1

ODAC Sign

Logic ‘1’ for positive offset DAC output. Logic ‘0’ for negative offset DAC output.

0

OTCDAC

Sign

Logic ‘1’ for positive offset TC DAC output. Logic ‘0’ for negative offset TC DAC output.

Table 4. Input Referred Offset (IRO[2:0])

IRO SIGN, IRO[2:0]

INPUT REFERRED OFFSET

CORRECTION AS % OF VDD

INPUT REFERRED OFFSET, CORRECTION

AT VDD = 5VDC IN mV

1,111

+1.25

+63

1,110

+1.08

+54

1,101

+0.90

+45

1,100

+0.72

+36

1,011

+0.54

+27

1,010

+0.36

+18

1,001

+0.18

+9

1,000

0

0

0,000

0

0

0,001

-0.18

-9

0,010

-0.36

-18

0,011

-0.54

-27

0,100

-0.72

-36

0,101

-0.90

-45

0,110

-1.08

-54

0,111

-1.25

-63