HT46R46 datasheet(33/77 Pages) HOLTEK

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HT46R46/C46/R47/C47/R48A/C48A/R49

Rev. 1.30

June 5, 2008

A/D Transfer Function

As the HT46R46 device contain an 8-bit A/D converter,

their full-scale converted digitized value is equal to

0FFH. Since the full-scale analog input value is equal to

the voltage, this gives a single bit analog input value of

VDD/256. For the other devices which each contain a

9-bit A/D converter, their full-scale converted digitised

value is equal to 1FFH giving a single bit analog input

value of VDD/512. The following graphs show the ideal

transfer function between the analog input value and the

digitised output value for the A/D converters.

Note that to reduce the quantisation error, a 0.5 LSB off-

set is added to the A/D Converter input. Except for the

digitised zero value, the subsequent digitised values will

change at a point 0.5 LSB below where they would

change without the offset, and the last full scale digitised

value will change at a point 1.5 LSB below the VDD level.

1 F E H

(

)

A / D C o n v e r s i o n

R e s u l t

1 F F H

1 F D H

0 3 H

0 2 H

0 1 H

0 . 5 L S B

5 0 9

5 1 0

5 1 1

5 1 2

A n a l o g I n p u t V o l t a g e

1 . 5 L S B

V D D

5 1 2

Ideal A/D Transfer Function - Other Devices

F E H

(

)

A / D C o n v e r s i o n

R e s u l t

F F H

F D H

0 3 H

0 2 H

0 1 H

0 . 5 L S B

2 5 3

2 5 4

2 5 5

2 5 6

A n a l o g I n p u t V o l t a g e

1 . 5 L S B

V D D

2 5 6

Ideal A/D Transfer Function - HT46R46

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