ADS1282IPWR datasheet(32/52 Pages) TI

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USER CALIBRATION

FSC[2:0]=400000h ´

ExpectedOutputCode

ActualOutputCode

(13)

FSC[2:0]=400000h ´

ExpectedRMSValue

ActualRMSValue

(14)

ADS1282

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

The value written to the FSC registers is calculated

by Equation 13.

System calibration of the ADS1282 can be performed

without

using

the

calibration

commands.

This

DC signal calibration is shown in Equation 13. The

procedure requires the calibration values to be

expected output code is based on 31-bit output data.

externally

calculated

and

then

written

the

calibration registers. The steps for this procedure are:

1. Set

the

OFSCAL[2:0]

and

GANCAL[2:0] = 400000h. These values set the

offset and gain registers to 0 and 1, respectively.

For ac signal calibration, use an RMS value of

collected data (as shown in Equation 14).

2. Apply a zero differential input to the input of the

system. Wait for the system to settle and then

average n output readings. Higher numbers of

averaged readings result in more consistent

calibration. Write the averaged value to the OFC

3. Apply a differential dc signal, or an ac signal

(typically full-scale, but not to exceed 103%

full-scale). Wait for the system to settle and then

average the n output readings.

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