ADS1282IPW datasheet(30/52 Pages) TI

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OFC[2:0] Registers

FSC[2:0] Registers

ADS1282

SBAS418E – SEPTEMBER 2007 – REVISED OCTOBER 2008 ........................................................................................................................................ www.ti.com

The offset calibration is a 24-bit word, composed of

The full-scale calibration is a 24-bit word, composed

three 8-bit registers, as shown in Table 17. The offset

of three 8-bit registers, as shown in Table 18. The

full-scale calibration value is 24-bit, straight offset

conversion data. The offset is in twos complement

binary, normalized to 1.0 at code 400000h. Table 16

format with a maximum positive value of 7FFFFFh

summarizes the scaling of the full-scale register. A

and a maximum negative value of 800000h. This

value is subtracted from the conversion data. A

correction (gain = 1). Note that while the full-scale

calibration register value corrects gain errors above 1

(default value). Note that while the offset calibration

(gain correction < 1), the full-scale range of the

analog inputs should not exceed 103% to avoid input

+FS (as shown in Table 15), to avoid input overload,

overload.

the analog inputs cannot exceed the full-scale range.

Table 16. Full-Scale Calibration Register Values

Table 15. Offset Calibration Values

FSC REGISTER

GAIN CORRECTION

OFC REGISTER

FINAL OUTPUT CODE(1)

800000h

2.0

7FFFFFh

80000000h

400000h

1.0

000001h

FFFFFF00h

200000h

0.5

000000h

00000000h

000000h

FFFFFFh

00000100h

800000h

7FFFFF00h

(1) Full 32-bit final output code with zero code input.

Table 17. Offset Calibration Word

BYTE

BIT ORDER

OFC0

LSB

B0 (LSB)

OFC1

MID

B15

B14

B13

B12

B11

B10

OFC2

MSB

B23 (MSB)

B22

B21

B20

B19

B18

B17

B16

Table 18. Full-Scale Calibration Word

BYTE

BIT ORDER

FSC0

LSB

B0 (LSB)

FSC1

MID

B15

B14

B13

B12

B11

B10

FSC2

MSB

B23 (MSB)

B22

B21

B20

B19

B18

B17

B16

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