MB90347CEPF datasheet(76/93 Pages) CYPRESS

76 / 93 page

Document Number: 002-04498 Rev. *A

Page 75 of 92

MB90340E Series

(Continued)

11.7 Notes on A/D Converter Section

Use the device with external circuits of the following output impedance for analog inputs :

Recommended output impedance of external circuits are : Approx. 1.5 k

 or lower (4.0 V

 AV

CC 5.5 V,

sampling period

 0.5 s)

If an external capacitor is used, in consideration of the capacitive voltage dividing effect between the external capacitor and the

internal on-chip capacitor, it is recommended that the capacitance of the external capacitor be several thousand times greater than

the capacitance of the internal capacitor.

3FFH

3FEH

3FDH

004H

003H

002H

001H

AVRL

AVRH

AVRL

AVRH

+ 1)H

− 1)H

− 2)H

VOT (actual measurement value)

{1 LSB

× (N − 1)

+ VOT }

Actual conversion

characteristics

VFST (actual

measurement

value)

VNT (actual

measurement value)

Actual conversion

characteristics

Ideal characteristics

Actual conversion

characteristics

Actual conversion

characteristics

Ideal

characteristics

Analog input

VNT

(actual measurement value)

V (N + 1) T

(actual measurement

value)

Non linearity error

Differential linearity error

Non linearity error of digital output N

 VNT  {1 LSB  (N  1)  VOT}

1 LSB

[LSB]

Differential linearity error of digital output N

 V (N+1) T  VNT

1 LSB

1 LSB [LSB]

VFST  VOT

1022

[V]

1 LSB



: Value of the digital output from the A/D converter

VOT : Voltage at which digital output transits from “000H” to “001H.”

VFST : Voltage at which digital output transits from “3FEH” to “3FFH.”

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