MB88101APF datasheet(9/19 Pages) FUJITSU

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MB88101A

(3) Definitions of A/D converter terms

• Resolution

Analog transition identifiable by the A/D converter

• Linearity error

Deviation of the straight line drawn between the zero transition point (0000 0000 0000

↔ 0000 0000 0001)

and the full-scale transition point (1111 1111 1110

↔ 1111 1111 1111) of the device from actual conversion

characteristics

• Differential linearity error

Deviation from the ideal input voltage required to shift output code by one LSB

Notes: • The tolerance of output impedance of an external circuit connected to this A/D converter has an effect on

conversion time (CLK frequency). See “s TYPICAL CHARACTERISTICS”.

• If the output impedance of the external input is too high, the analog voltage sampling time may be short.

• When turning the device on, turn the power supply for the digital system first before turning VREF on.

Digital output

Actual converted value

Ideal converted value

Analog output

1111 1111 1111

1111 1111 1110

0000 0000 0001

0000 0000 0000

0000 0000 0010

VOT

VNT V(N+1)T

VFST

(1 LSB

× N + VOT)

Linearity error

1 LSB

Linearity error

Differential linearity error

- 1

(LSB)

VFST

- VOT

4094

VNT

- (1 LSB

× N + VOT)

1 LSB

V(N+1)T

- VNT

1 LSB

•

Analog input

RON1

RON2

Comparator

⋅ RON1 = About 1.5 kΩ

⋅ RON2 = About 1.5 kΩ

⋅ C0 = About 60 pF

• Analog input equivalent circuit

Note: The above values are reference values.

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