AD7225 datasheet(13/24 Pages) AD

13 / 24 page

AD7225

Rev. C | Page 13 of 24

UNIPOLAR OUTPUT OPERATION

This is the basic mode of operation for each channel of the

AD7225, with the output voltage having the same positive

polarity as VREFx. The AD7225 can be operated single supply

(VSS = AGND) or with positive/negative supplies (see the Op

Amp Section, which outlines the advantages of having negative

VSS). Connections for the unipolar output operation are shown

in Figure 16. The voltage at any of the reference inputs must

never be negative with respect to DGND. Failure to observe this

precaution may cause parasitic transistor action and possible

device destruction. The code table for unipolar output

operation is shown in Table 7.

Note,

(

)

( )













−

256

REF

LSB

VREFA VREFB VREFC VREFD

VDD

VSS

AGND

DGND

VOUTA

DAC A

VOUTB

DAC B

VOUTC

DAC C

VOUTD

DAC D

DB7

(MSB)

DB0

(LSB)

LDAC

AD7225

Figure 16. Unipolar Output Circuit

Table 7. Unipolar Code Table

DAC Latch Contents

Analog Output

MSB

LSB

1111

( )

256

255

REF

1000

0001

( )

256

129

REF

1000

0000

( )

256

128

REF

0111

1111

( )

256

127

REF

0000

0001

( )

256

REF

0000

0 V

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