ADS4225 datasheet(36/104 Pages) TI1

36 / 104 page

ADS4222, ADS4225, ADS4226

ADS4242, ADS4245, ADS4246

SBAS533C

– MARCH 2011 – REVISED JUNE 2011

www.ti.com

CH A OFFSET PEDESTAL

Bits[7:2]

CH A OFFSET PEDESTAL: Channel A offset pedestal selection

When the offset correction is enabled, the final converged value after the offset is corrected is the

ADC midcode value. A pedestal can be added to the final converged value by programming these

bits. See the Offset Correction section. Channels can be independently programmed for different

offset pedestals by choosing the relevant register address.

For the ADS424x, the pedestal ranges from

–32 to +31, so the output code can vary from

midcode-32 to midcode+32 by adding pedestal D7-D2.

For the ADS422x, the pedestal ranges from

–8 to +7, so the output code can vary from midcode-8

to midcode+7 by adding pedestal D7-D4.

ADS422x (Program Bits D[7:4])

ADS424x (Program Bits D[7:2])

0111 = Midcode+7

011111 = Midcode+31

0110 = Midcode+6

011110 = Midcode+30

0101 = Midcode+5

011101 = Midcode+29

…

0000 = Midcode

000000 = Midcode

1111 = Midcode-1

111111 = Midcode-1

1110 = Midcode-2

111110 = Midcode-2

1101 = Midcode-3

111101 = Midcode-3

…

1000 = Midcode-8

100000 = Midcode-32

Bits[1:0]

Always write '0'

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Product Folder Link(s): ADS4222 ADS4225 ADS4226 ADS4242 ADS4245 ADS4246

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