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MB90583CAPF bảng dữ liệu(PDF) 98 Page - fujitsu semiconductor

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MB90580C Series
98
7.
Notes on Using A/D Converter
Select the output impedance value for the external circuit of analog input according to the following conditions.
Output impedance values of the external circuit of 7 k
Ω or lower are recommended.
When capacitors are connected to external pins, the capacitance of several thousand times the internal capacitor
value is recommended to minimized the effect of voltage distribution between the external capacitor and internal
capacitor.
When the output impedance of the external circuit is too high, the sampling period for analog voltages may not
be sufficient (sampling period = 4.00
µs @machine clock of 16 MHz)
• Error
The smaller the | AVRH - AVRL |, the greater the error would become relatively.
8.
D/A Converter Electrical Characteristics
(VCC
= AVCC = 5.0 V±10%, VSS = AVSS = DVSS = 0.0 V, TA = −40 °C to +85 °C)
*1 : Load capacitance: 20 pF
*2 : In sleep mode
Parameter
Symbol Pin name
Value
Unit
Remarks
Min.
Typ.
Max.
Resolution

8
bit
Differential linearity error

±0.9
LSB
Absolute accuracy

±1.2
%
Linearity error

±1.5
LSB
Conversion time

10
20
µs*1
Analog reference voltage
DVRH
VSS
+ 3.0
AVCC
V
Reference voltage supply
current
IDVR
DVRH
120
300
µA
IDVRS

10
µA*2
Analog output impedance

20
k
Ω
• Equipment of analog input circuit model
C0
C1
Analog input
Comparator
Note: Listed values must be considered as standards.
MB90587, MB90V580B
R
≅ 1.5 kΩ, C ≅ 30 pF
MB90F583B
R
≅ 3.0 kΩ, C ≅ 65 pF
MB90583B
R
≅ 2.2 kΩ, C ≅ 45 pF



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