M37225M6_15 datasheet(54/128 Pages) RENESAS

Part #	M37225M6

Description	SNGLE-CHIP 8-BIT CMOS MICROCOMPUTER for VOLTAGE SYNTHESIZER with ON-SCREEN DISPLAY CONTROLLER

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Manufacturer	RENESAS [Renesas Technology Corp]

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54 / 128 page

M37225M6/M8/MA/MC-XXXSP, M37225ECSP

Rev.1.00

Nov 01, 2000

page 52 of 124

REJ03B0136-0100Z

[LSB]

8.8.8 Definition of A-D Conversion Accuracy

The definition of A-D conversion accuracy is described below (refer

to Figure 8.8.4).

(1) 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]

• EDifferential 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.

(2) Absolute Accuracy

• EAbsolute 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

8.8.4) :

V254 – V0

254

VREF

256

[V]

Fig. 8.8.4 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.

Vn – 1LSBA ✕ (n + 1/2)

1LSBA

Output code

0

Analog input voltage (mV)

20

40

80

100

120

140

160

180

200

220

0016

0116

0216

0316

0416

0516

0616

0716

0816

0916

+ 2LSB

– 2LSB

60

Absolute accuracy

Limitless resolution A-D

conversion characteristics

Ideal A-D conversion

characteristics

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