
R01DS0060EJ0100 Rev.1.00
Page 148 of 168
Sep 13, 2011
RX630 Group
5. Electrical Characteristics
Note: When A/D conversion is done during access to the external bus, the accuracy may degrade.
In this case, repeat conversion several times and calculate by software the average of the converted values, excluding the
maximum and minimum values.
Note 1. The conversion time includes the sampling time and the comparison time. As the test conditions, the number of sampling states
is indicated.
Note 2. The value in parentheses indicates the sampling time.
Table 5.22
12-Bit A/D Conversion Characteristics
Conditions: VCC = AVCC0 = VCC_USB = 2.7 to 3.6 V, VREFH/VREFH0 = 2.7 V to AVCC0
VSS = AVSS0 = VREFL/VREFL0 = VSS_USB = 0 V
PCLK = 8 to 50 MHz
Ta = Topr
Item
Min.
Typ.
Max.
Unit
Test
Conditions
Resolution
12
Bit
Conversion
(Operation
at PCLK =
50 MHz)
AN0 to AN7
Permissible signal source impedance
(max.) = 1.0 k
—
s
Sampling
in 20
states
Other channels
Permissible signal source impedance
(max.) = 1.0 k
, AVCC
3.0 V
—
s
Sampling
in 70
states
Permissible signal source impedance
(max.) = 1.0 k
, AVCC
2.7 V
—
s
Sampling
in 250
states
Analog input capacitance
—
30
pF
Offset error
—
±2.0
±7.5
LSB
Full-scale error
—
±2.0
±7.5
LSB
Quantization error
—
±0.5
—
LSB
Absolute accuracy
—
±2.5
±8.0
LSB
DNL differential nonlinearity error
—
±2.0
±4.0
LSB
INL integral nonlinearity error
—
±2.0
±4.0
LSB
Table 5.23
A/D Internal Reference Voltage Characteristics
Conditions: VCC = AVCC0 = VCC_USB = 2.7 to 3.6 V, VREFH/VREFH0 = 2.7 V to AVCC0
VSS = AVSS0 = VREFL/VREFL0 = VSS_USB = 0 V
PCLK = 8 to 50 MHz
Ta = Topr
Item
Min.
Typ.
Max.
Unit
Test
Conditions
A/D Internal reference voltage
1.45
1.50
1.55
V