7477 datasheet(231/354 Pages) RENESAS

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HARDWARE

1.20 Electrical characteristics

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

(2) Absolute precision

Figure 1.20.19 to Figure 1.20.23 show the A-D conversion standard characteristics on the absolute

precision of the 7470/7471/7477/7478 group.

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

code changes, namely, absolute 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 = 762 mV. However, since the

absolute precision error is -8.4 mV, “762 - 8.4 = 753.6 mV represents the measuring change point.

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

is the same. For example, since the measured value of input voltage width, when the output code

is “3F16”, is 10.8 mV, the differential nonlinear error represents “10.8 - 12 = -1.2 mV (-0.1 LSB).

Fig. 1.20.19 A-D conversion standard characteristics, absolute precision error (1)

-2LSB

STEP No.

VCC = 3.1 [V] ,

XIN = 4.0 [MHZ] ,

Temp. = 25.0 [deg. C]

: 1LSB WIDTH

: ERROR

Absolute precision

VREF = 3.072 [V]

ANALOG INPUT

IN0

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

-24

-36

-12

-24

-36

-12

162432

40485664

72808896

104

112

120

128

-2LSB

STEP No.

136

144

152

160

168

176

184

192

200

208

216

224

232

240

248

256

24 +2LSB

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