Datasheet

R8C/33T Group 5. Electrical Characteristics
R01DS0046EJ0110 Rev.1.10 Page 29 of 47
Apr 26, 2011
Notes:
1. Vcc/AVcc = Vref = 2.2 V to 5.5 V, Vss = 0 V at Topr =
−20°C to 85°C (N 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-consumption
current 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
——±3LSB
Vref = AVcc = 3.3 V AN0 to AN7 input
AN8 to AN11 input
——±5LSB
Vref = AVcc = 3.0 V AN0 to AN7 input
AN8 to AN11 input
——±5LSB
Vref = AVcc = 2.2 V AN0 to AN7 input
AN8 to AN11 input
——±5LSB
8-bit mode Vref = AVcc = 5.0 V AN0 to AN7 input
AN8 to AN11 input
——±2LSB
Vref = AVcc = 3.3 V AN0 to AN7 input
AN8 to AN11 input
——±2LSB
Vref = AVcc = 3.0 V AN0 to AN7 input
AN8 to AN11 input
——±2LSB
Vref = AVcc = 2.2 V AN0 to AN7 input
AN8 to AN11 input
——±2LSB
φAD A/D conversion clock
4.0 V
≤ Vref = AVcc ≤ 5.5 V
(2)
2—20MHz
3.2 V
≤ Vref = AVcc ≤ 5.5 V
(2)
2—16MHz
2.7 V
≤ Vref = AVcc ≤ 5.5 V
(2)
2—10MHz
2.2 V
≤ Vref = AVcc ≤ 5.5 V
(2)
2—5MHz
— Tolerance level impedance — 3 — k
Ω
tCONV Conversion time 10-bit mode Vref = AVcc = 5.0 V, φAD = 20 MHz 2.2 — — µs
8-bit mode Vref = AVcc = 5.0 V,
φAD = 20 MHz 2.2 — — ms
t
SAMP Sampling time φAD = 20 MHz 0.8 — — µs
I
Vref Vref current Vcc = 5.0 V, XIN = f1 = φAD = 20 MHz — 45 — µA
V
ref Reference voltage 2.2 — AVcc V
V
IA
Analog input voltage
(3)
0—VrefV
OCVREF On-chip reference voltage 2 MHz
≤ φAD ≤ 4 MHz 1.19 1.34 1.49 V