7477 datasheet(229/354 Pages) RENESAS

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HARDWARE

1.20 Electrical characteristics

7470/7471/7477/7478 GROUP USER’S MANUAL

1.20.5 A-D conversion standard characteristic

(1) Relative precision (7470/7471 group)

Figure 1.20.17 to Figure 1.20.18 show the A-D conversion standard characteristics on the relative

precision of the 7470/7471 group.

In the graph, the lower line indicates a deviation from the ideal value at the point where the output

code changes, namely, relative precision error (ERROR). For example, in Figure 1.20.17, the change

of “3F16 to 4016” of the output code occurs ideally at the point of IN0 = 757.32 mV. However, since

the relative precision error is -3.567 mV, “757.32 - 3.567 = 753.753 mV” represents a measuring

change point.

In the graph, the upper line indicates an input voltage width (1 LSB WIDTH) in which the output code

is the same. For example, in Figure 1.20.17, since the measured value of input voltage width, when

the output code is “3F16”, is 10.701 mV, the differential nonlinear error on the relative precision

represents “10.701 -11.89 = -1.189 mV (-0.1 LSB)”.

Fig. 1.20.17 A-D conversion standard characteristics, relative precision error (1)

+1LSB

-1LSB

STEP No.

VCC = 3.1 [V] ,

XIN = 4.0 [MHZ] ,

Temp. = 25.0 [deg. C]

ZERO TRANSITION ERROR

2.25 [mV]

FULL - SCALE TRANSITION ERROR

25.5 [mV]

: 1LSB WIDTH

: ERROR

Relative precision

VREF = 3.072 [V]

ANALOG INPUT

IN0

V V V M37471M8 A/D CONV. ERROR & STEP WIDTH V V V

11.890

-11.89

162432

40485664

72808896

104

112

120

128

+1LSB

-1LSB

STEP No.

11.890

-11.89

136

144

152

160

168

176

184

192

200

208

216

224

232

240

248

256

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