7547 datasheet(73/91 Pages) RENESAS

73 / 91 page

Rev.1.21

Nov 15, 2006

page 73 of 89

REJ03B0156-0121

7547 Group

A/D Converter Characteristics

A/D Converter characteristics

(VCC = 2.7 to 5.5 V, VSS = 0 V, Ta = –20 to 85 °C, unless otherwise noted)

Resolution

Absolute accuracy

Conversion time

Ladder resistor

Reference power source input current

A/D port input current

Min.

Typ.

Max.

Symbol

Parameter

Limits

Unit

Test conditions

Bits

LSB

tc(XIN)

Ω

µA

± 3

122

200

120

5.0

—

tCONV

RLADDER

IVREF

II(AD)

150

Note: AD conversion accuracy may be low under the following conditions;

(1) When the VREF voltage is set to be lower than the VCC voltage, an analog circuit in this microcomputer is affected by noise.

The accuracy is lower than the case the VREF voltage is the same as VCC voltage.

(2) When the VREF voltage is 3.0 V or less at the low temperature, the AD conversion accuracy may be very lower than at room temperature.

When system is used at low temperature, that VREF is 3.0 V or more is recommended.

Ta = 25 °C

VCC = VREF = 2.7 to 5.5 V

AD conversion clock = f(XIN)/2

AD conversion clock = f(XIN)

VREF = 5.0 V

VREF = 3.0 V

7547 Datasheet(PDF) 73 Page - Renesas Technology Corp

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