Fujitsu MB90M405 Hardware Manual page 27

4. A/D Conversion Unit Electrical Characteristics
Parameter
Resolution
Overall error
Non-linearity error
Differential linearity error
Zero transition voltage
Full scale transition
voltage
Conversion time
(Sampling + Compare)
Sampling time
Compare time
Analog port input current
Analog input voltage
Reference voltage
Power supply current
Reference voltage
supply current
Channel differences
*1: When not operating A/D converter, this is the current (V
stopped.
*2: t means: 1/internal operating frequency. When the internal operating frequency is 16 MHz, t
CP
1/16 MHz = 62.5 ns.
Notes: 1. The reference L value is fixed at AV
The error is relatively large as the AV
2. Analog input external circuit output impedance should use the following conditions.
3. If the external circuit output impedance is too high, there maybe insufficient time for
sampling of the analog voltage.
• Analog input circuit model diagram
Analog input
Note: Numeric values herein should be used as a guide.
(T = –40 to +85°C, V
A CC-CPU
Symbol Pin
— —
— —
— —
— —
AN0 to
V
OT
AN15 –1.5 LSB
AN0 to
V
FST
AN15 –3.5 LSB
— —
98 t
— —
32 t
— — 66 t
AN0 to
I
AIN
AN15
AN0 to
V
AIN
AN15
— AVcc
I AVcc
A
I AVcc
AH
I AVcc
R
I AVcc
RH
AN0 to
—
AN15
External Circuit Output Impedance ≤ 10 kΩ
R
ON
MB90M407/M408
R= About 1.5 kΩ
ON
C= About 30 pF
MB90MF408, MB90MV405
R = About 3.0 kΩ
ON
C = About 65 pF
≤ AVcc = 3.0 V to 3.6 V, V
Rated value
Min. Typ.
— —
— —
— —
— —
Avss A•ss
+0.5 LSB
AVcc AVcc
–1.5 LSB
2
—
*
CP
2
—
*
CP
2
* —
CP
— —
0 —
3.0 —
— —
— —
— 100
— —
— —
= AV = 3.3 V) when the CPU is
CC-CPU CC
; the reference H value is fixed at AV
SS
becomes smaller.
CC
C
= V = AVss = 0 V)
SS-CPU SS-IO
Unit Remarks
Max.
Can switch to 8
10 bit
bits
LSB
±3.0
LSB
±2.5
LSB
±1.9
Avss
mV
+2.5 LSB
1LSB=
AVcc/1022
Avcc
mV
+0.5 LSB
—
ns 16 MHz operation
—
ns 16 MHz operation
— ns 16 MHz operation
µA
10
AVcc V
AVcc V
5 mA
µA 1
5 *
µA
200
1
µA
5 *
4 LSB
.
CC
Comparator
is
CP