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R8C/35M Group
5. Electrical Characteristics
R01DS0021EJ0100 Rev.1.00
Jun 20, 2011
Notes:
1.
VCC/AVCC = Vref = 2.2 to 5.5 V, VSS = 0 V and Topr =
20 to 85°C (N version) / 40 to 85°C (D version), unless otherwise
specified.
2.
The A/D conversion result will be undefined in wait mode, stop mode, when the flash memory stops, and in low-current-
consumption mode. Do not perform A/D conversion in these states or transition to these states during A/D conversion.
3.
When the analog input voltage is over the reference voltage, the A/D conversion result will be 3FFh in 10-bit mode and FFh in
8-bit mode.
Table 5.3
A/D Converter Characteristics
Symbol
Parameter
Conditions
Standard
Unit
Min.
Typ.
Max.
Resolution
Vref = AVCC
10
Bit
Absolute accuracy
10-bit mode
Vref = AVCC = 5.0 V
AN0 to AN7 input,
AN8 to AN11 input
±3
LSB
Vref = AVCC = 3.3 V
AN0 to AN7 input,
AN8 to AN11 input
±5
LSB
Vref = AVCC = 3.0 V
AN0 to AN7 input,
AN8 to AN11 input
±5
LSB
Vref = AVCC = 2.2 V
AN0 to AN7 input,
AN8 to AN11 input
±5
LSB
8-bit mode
Vref = AVCC = 5.0 V
AN0 to AN7 input,
AN8 to AN11 input
±2
LSB
Vref = AVCC = 3.3 V
AN0 to AN7 input,
AN8 to AN11 input
±2
LSB
Vref = AVCC = 3.0 V
AN0 to AN7 input,
AN8 to AN11 input
±2
LSB
Vref = AVCC = 2.2 V
AN0 to AN7 input,
AN8 to AN11 input
±2
LSB
φAD
A/D conversion clock
4.0 V
≤ Vref = AVCC ≤ 5.5 V (2) 2
20
MHz
3.2 V
≤ Vref = AVCC ≤ 5.5 V (2) 2
16
MHz
2.7 V
≤ Vref = AVCC ≤ 5.5 V (2) 2
10
MHz
2.2 V
≤ Vref = AVCC ≤ 5.5 V (2) 2
5MHz
Tolerance level impedance
3
k
tCONV
Conversion time
10-bit mode
Vref = AVCC = 5.0 V,
φAD = 20 MHz
2.2
s
8-bit mode
Vref = AVCC = 5.0 V,
φAD = 20 MHz
2.2
s
tSAMP
Sampling time
φAD = 20 MHz
0.8
s
IVref
Vref current
VCC = 5 V, XIN = f1 =
φAD = 20 MHz
45
A
Vref
Reference voltage
2.2
AVCC
V
VIA
0
Vref
V
OCVREF On-chip reference voltage
2 MHz
≤ φAD ≤ 4 MHz
1.19
1.34
1.49
V