M37271MF-252SP datasheet(28/97 Pages) MITSUBISHI

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MITSUBISHI MICROCOMPUTERS

M37271MF-XXXSP

M37271EF-XXXSP, M37271EFSP

SINGLE-CHIP 8-BIT CMOS MICROCOMPUTER with CLOSED CAPTION DECODER

and ON-SCREEN DISPLAY CONTROLLER

[LSB]

(8) Definition of A-D Conversion Accuracy

The definition of A-D conversion accuracy is described below.

1Relative accuracy

· Zero transition error (V0T)

The deviation of the input voltage at which A-D conversion output

data changes from “0” to “1,” from the corresponding ideal A-D

conversion characteristics between 0 and VREF.

· Non-linearity error

The deviation of the actual A-D conversion characteristics, from the

ideal A-D conversion characteristics between V0 and V254.

(V0 –1/2 ! VREF/256)

1LSB

V0T =

(VREF – 3/2 ! VREF/256) – V254

1LSB

VFST =

Non-linearity error =

[LSB]

· Differential non-linearity error

The deviation of the input voltage required to change output data

by “1,” from the corresponding ideal A-D conversion characteris-

tics between 0 and VREF.

2Absolute accuracy

· Absolute accuracy error

The deviation of the actual A-D conversion characteristics, from the

ideal A-D conversion characteristics between 0 and VREF.

Vn – (1LSB ! n + V0)

1LSB

[LSB]

Differential non-linearity error =

(Vn+1 – Vn) – 1LSB

1LSB

Absolute accuracy error =

1LSBA with respect to absolute accuracy =

1LSB with respect to relative accuracy =

Note: The analog input voltage “Vn” at which A-D conversion output

data changes from “n” to “n + 1” (n ; 0 to 254) is as follows

(refer to Figure 18).

V254 – V0

254

VREF

256

[V]

Fig. 21. Definition of A-D conversion precision

· Full-scale transition error (VFST)

The deviation of the input voltage at which A-D conversion output

data changes from “255” to “254,” from the corresponding ideal A-

D conversion characteristics between 0 and VREF.

Vn – 1LSBA ! (n+1/2)

1LSBA

Output

data

Analog input

voltage (V)

Vn Vn+1

V254

VREF

n+1

254

255

Zero transition error (V 0T)

Differential non-

linearity error

LSBA

Actual A-D

conversion

characteristics

1LSB A

Ideal A-D conversion characteristics

between V0 and V254

LSBA

1LSB

Absolute accuracy

Non-linearity error

Full-scale transition error

(VFST)

1LSB

M37271MF-252SP Datasheet(PDF) 28 Page - Mitsubishi Electric Semiconductor

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