MB9B320M datasheet(82/108 Pages) CYPRESS

82 / 108 page

Document Number: 002-05652 Rev. *D

Page 82 of 108

MB9B320M Series

Definition of 12-bit A/D Converter Terms

Resolution:

Analog variation that is recognized by an A/D converter.

Integral Nonlinearity:

Deviation of the line between the zero-transition point

(0b000000000000 ←→ 0b000000000001) and the full-scale transition point

(0b111111111110 ←→ 0b111111111111) from the actual conversion characteristics.

Differential Nonlinearity:

Deviation from the ideal value of the input voltage that is required to change the output code

by 1 LSB.

Integral Nonlinearity of digital output N =

VNT - {1LSB × (N - 1) + VZT}

[LSB]

1LSB

Differential Nonlinearity of digital output N =

V(N + 1) T - VNT

- 1 [LSB]

1LSB

1LSB =

VFST - VZT

4094

A/D converter digital output value.

VZT:

Voltage at which the digital output changes from 0x000 to 0x001.

VFST:

Voltage at which the digital output changes from 0xFFE to 0xFFF.

VNT:

Voltage at which the digital output changes from 0x(N − 1) to 0xN.

Integral Nonlinearity

Differential Nonlinearity

Actual conversion

characteristics

Actual conversion

characteristics

Ideal characteristics

(Actually-

measured

value)

Actual conversion

characteristics

Actual conversion characteristics

(Actually-measured

value)

(Actually-measured value)

Ideal characteristics

(Actually-measured

value)

Analog input

(Actually-measured

value)

0x001

0x002

0x003

0x004

0xFFD

0xFFE

0xFFF

AVRL

AVRH

AVRL

AVRH

0x(N-2)

0x(N-1)

0x(N+1)

0xN

{1 LSB(N-1) + VZT}

VNT

VFST

VZT

VNT

V(N+1)T

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