Datasheet

R01DS0041EJ0150 Rev.1.50 Page 183 of 221
Oct 18, 2013
RX210 Group 5. Electrical Characteristics
5.4 A/D Conversion Characteristics
Note: • PCLKD must be set to 40 MHz or lower when HOCO is to be selected as the A/D conversion clock. The characteristics apply
when no pin functions other than A/D converter input are used. Absolute accuracy includes quantization errors. Offset error,
full-scale error, DNL differential nonlinearity error, and INL integral nonlinearity error do not include quantization errors.
Note: • When using the channel-dedicated sample-and-hold circuit, use the AN000 to AN002 analog input voltage (V
AN
) that satisfies all
the following conditions: 0.25 V ≤ V
AN
≤ AVCC0 - 0.25 V, V
AN
≤ VREFH0, and AVCC0 ≥ 2.7 V.
Note 1. The conversion time is the sum of 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.
Note 3. When using the temperature sensor, use it when AVCC0 = VREFH0.
Figure 5.99 AVCC0 to VREFH0 Voltage Range
Table 5.61 A/D Conversion Characteristics (1)
Conditions: VCC = AVCC0 = 2.7 to 5.5 V, VREFH0 ≥ 2.7 V, AVCC0-0.9 V ≤ VREFH0 ≤ AVCC0*
3
,
VSS = AVSS0 = VREFL = VREFL0 = 0 V, T
a
= –40 to +105°C
Item Min. Typ. Max. Unit Test Conditions
A/D conversion clock frequency (fPCLKD) 1 — 50 MHz
Resolution — — 12 Bit
Conversion time*
1
(Operation at
fPCLKD = 50 MHz)
Permissible signal source
impedance (Max.) = 0.5 kΩ
1.0
(0.4)*
2
— — µs Sampling in 20 states
Permissible signal source
impedance (Max.) = 1 kΩ
1.1
(0.5)*
2
— — Sampling in 25 states
Permissible signal source
impedance (Max.) = 5 kΩ
1.5
(0.9)*
2
— — Sampling in 45 states
Analog input capacitance — — 30 pF
Offset error — ±0.5 ±4.5 LSB High-precision channel
±7.5 Normal-precision channel
Full-scale error — ±0.75 ±4.5 LSB High-precision channel
±7.5 Normal-precision channel
Quantization error — ±0.5 — LSB
Absolute accuracy — ±1.25 ±5.0 LSB High-precision channel
— ±1.25 ±8.0 LSB Normal-precision channel
DNL differential nonlinearity error — ±1.0 — LSB
INL integral nonlinearity error — ±1.0 ±3.0 LSB
1.0 2.0 3.0
4.0
5.0
AVCC0
1.0
2.0
3.0
4.0
5.0
VREFH0
3.6
1.8
1.62
1.8
1.62
2.7
2.7
4.6
Characteristics listed in
Table 5.64
Characteristics listed in
Table 5.61
Characteristics listed
in Table 5.65