MB88101A Fujitsu Microelectronics, Inc., MB88101A Datasheet - Page 9

• Manufacturer Part Number: MB88101A
• Description: CMOS A/D Converter (with 4-channel Input at 12-bit Resolution)
• Manufacturer: Fujitsu Microelectronics, Inc.

Notes: • The tolerance of output impedance of an external circuit connected to this A/D converter has an effect on
• Analog input equivalent circuit
(3) Definitions of A/D converter terms
• Resolution
• Linearity error
• Differential linearity error
1111 1111 1111
1111 1111 1110
0000 0000 0010
0000 0000 0001
0000 0000 0000
Analog transition identifiable by the A/D converter
Deviation of the straight line drawn between the zero transition point (0000 0000 0000
and the full-scale transition point (1111 1111 1110
characteristics
Deviation from the ideal input voltage required to shift output code by one LSB
• 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 V
conversion time (CLK frequency). See “ TYPICAL CHARACTERISTICS”.
Digital output
Analog input
V
OT
Note: The above values are reference values.
1 LSB
Linearity error
Differential linearity error
R
R
C
ON1
ON2
0
= About 60 pF
= About 1.5 k
= About 1.5 k
(1 LSB
R
ON1
N + V
=
=
=
V
V
NT
NT
OT
– (1 LSB
)
V
V
V
(N+1)T
(N+1)T
FST
1 LSB
1 LSB
4094
R
– V
ON2
– V
OT
N + V
Linearity error
NT
1111 1111 1111) of the device from actual conversion
–1
OT
)
Actual converted value
(LSB)
(LSB)
C
0
V
FST
Analog output
Ideal converted value
Comparator
MB88101A
0000 0000 0001)
REF
on.
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