P18/29

Rev. M, May 2010

ML5012

When selecting the AD_Range, it’s actually selecting the reference zero point. For AD_Range is 0 – 4096, the

reference zero point is AGND, when AD_Range is -2047~+2046, the reference zero point is (VR-AGND)/2, so users

can select your target AD_Range based on the above calculation.

If AD_Range = 0

(

)

[

]

VREF

GAIN

PGA

V

V

AGND

VR

OUT

AD

CHB

CHA

+

×

−

×

−

=

_

4096

_

If AD_Range = 1

(

)

[

_

4096

_

−

+

×

−

×

−

=

VREF

GAIN

PGA

V

V

AGND

VR

OUT

AD

CHB

CHA