MB90650A Series
95
5.
A/D Converter Electrical Characteristics
(MB90652A/653A/654A: VCC = 2.2 V to 3.6 V, VSS = AVSS =0.0V, 2.7 V
≤ AVRH – AVRL, TA = –40°C to +85°C)
(MB90F654A: VCC = 2.4 V to 3.6 V, VSS = AVSS = 0.0 V, 2.7 V
≤ AVRH – AVRL, TA = –40°C to +85°C)
*1: For a 12 MHz machine clock
*2: The current when the A/D converter is not operating or the CPU is in stop mode (for VCC = AVCC = AVRH = 3.0 V).
Notes: The error increases proportionally as |AVRH – AVRL| decreases.
The output impedance of the external circuits connected to the analog inputs should be in the following
range.
The output impedance of the external circuit should be less than approximately 7 k
.
When using an external capacitor, it is recommended to have several thousand times the capacitance of
the internal capacitor as a guide, if one takes into consideration the effect of the divided capacitance
between the external capacitor and the internal capacitor.
If the output impedance of the external circuit is too high, the sampling time might be insufficient (sampling
time = 3.75
s at a machine clock of 16 MHz).
VCC = VCC1 = VCC2
Parameter
Symbol
Pin name
Value
Unit
Remarks
Min
Typ
Max
Resolution
—
10
bit
Total error
—
±3.0
LSB
Linearity error
—
±2.0
LSB
Differential
linearity error
——
—
±1.9
LSB
MASK/FLASH
Zero transition
voltage
VOT
AN0 to AN7
AVRL
– 1.5 LSB
AVRL
+ 0.5 LSB
AVRL
+ 2.5 LSB
mV
Full scale
transition voltage
VFST
AN0 to AN7
AVRH
– 4.5 LSB
AVRH
– 1.5 LSB
AVRH
+ 0.5 LSB
mV
Conversion time
—
8.167*1
——
s
MASK/FLASH
Analog port input
current
IAIN
AN0 to AN7
—
0.1
10
A
Analog input
voltage
VAIN
AN0 to AN7
AVRL
—
AVRH
V
Reference voltage
—
AVRH
AVRL + 2.7
—
AVCC
V
AVRL
0
—
AVRH –
2.7
V
Power supply
current
IA
AVCC
—3
—
mA
IAH
AVCC
——
5*2
A
Reference voltage
supply current
IR
AVRH
—
200
—
A
IRH
AVRH
—
5*2
A
Variation between
channels
—
AN0 to AN7
—
4
LSB