R8C datasheet(32/60 Pages) RENESAS

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R8C/38A Group

5. Electrical Characteristics

REJ03B0274-0120 Rev.1.20

Page 32 of 57

Jul 31, 2010

Notes:

1. VCC/AVCC = Vref = 2.2 to 5.5 V, VSS = 0 V, and Topr =

−20 to 85°C (N version), unless otherwise specified.

2. When the CPU and flash memory stop, the A/D conversion result will be undefined.

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

——

Bit

—

Absolute accuracy

10-bit mode

Vref = AVCC = 5.0 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±3

LSB

Vref = AVCC = 3.3 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±5

LSB

Vref = AVCC = 3.0 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±5

LSB

Vref = AVCC = 2.2 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±5

LSB

8-bit mode

Vref = AVCC = 5.0 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±2

LSB

Vref = AVCC = 3.3 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±2

LSB

Vref = AVCC = 3.0 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±2

LSB

Vref = AVCC = 2.2 V

AN0 to AN7 input,

AN8 to AN11 input,

AN12 to AN19 input

—

±2

LSB

φAD

A/D conversion clock

4.0 V

≤ Vref = AVCC ≤ 5.5 V (2)

2—

MHz

3.2 V

≤ Vref = AVCC ≤ 5.5 V (2)

2—

MHz

2.7 V

≤ Vref = AVCC ≤ 5.5 V (2)

2—

MHz

2.2 V

≤ Vref = AVCC ≤ 5.5 V (2)

2—

MHz

—

Tolerance level impedance

—

Ω

DNL

Differential non-linearity error

—

±1

LSB

tCONV

Conversion time

10-bit mode

Vref = AVCC = 5.0 V,

φAD = 20 MHz

2.15

—

µs

8-bit mode

Vref = AVCC = 5.0 V,

φAD = 20 MHz

2.15

—

µs

tSAMP

Sampling time

φAD = 20 MHz

0.75

—

µs

IVref

Vref current

VCC = 5.0 V, XIN = f1 =

φAD = 20 MHz

—

µA

Vref

Reference voltage

2.2

—

AVCC

VIA

Analog input voltage (3)

0—

Vref

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