M37274EFSP datasheet(37/148 Pages) RENESAS

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

and ON-SCREEN DISPLAY CONTROLLER

M37274EFSP

PRELIMINARY

Notice:

This

is not

a final

specification.

Some

paramentic

limits

are

subject

to change.

MITSUBISHI MICROCOMPUTERS

[LSB]

(8) Definition of A-D Conversion Accuracy

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

Relative 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.

Absolute accuracy

Absolute accuracy error

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

ideal A-D conversion characteristics between 0 and VREF.

(1LSB

V0)

1LSB

[ LSB]

Differential non-linearity error =

(Vn+1 –

–

Vn)

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 30) :

V254

254

VREF

256

Fig. 30. Definition of A-D Conversion Accuracy

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.

1LSBA

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

––

–

•

–

]

[

V ]

[

)

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