M30620FCAFP datasheet(456/615 Pages) RENESAS

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A-D Converter

Mitsubishi microcomputers

M16C / 62A Group

SINGLE-CHIP 16-BIT CMOS MICROCOMPUTER

2-139

2.7.14 Internal Equivalent Circuit of Analog Input

Figure 2.7.28 shows the internal equivalent circuit of analog input.

Figure 2.7.28. Internal equivalent circuit to analog input

ON resistor

approx. 2k

A-D successive conversion

Analog input voltage

AVcc

AVss

Chopper-type

amplifier

ADT/A-D conversion

interrupt request

Vcc

Vss

VIN

A-D control register 0

Comparison voltage

Comparison reference voltage (Vref) generator

VREF

AVss

Vref

b2 b1 b0

Vcc

Vss

AN i

Wiring resistor

approx. 0.2k

ON resistor

approx. 0.6k

SW2

Sampling

control signal

SW1

C = Approx. 3.0pF

SW3

SW4

AMP

ON resistor,

approx. 5k

SW2

Reference control

signal

Resistor

ladder

Control signal

for SW2

Control signal

for SW3

Connect to

Comparison

Connect to

Sampling

i ladder-type

switches

i ladder-type wiring

resistors

ON resistor

approx. 0.6k

AN0

Parasitic

diode

SW1

SW1 conducts only on the ports selected for analog input.

SW2 and SW3 are open when A-D conversion is not in

progress; their status varies as shown by the waveforms in

the diagrams on the left.

SW4 conducts only when A-D conversion is not in progress.

Parasitic

diode

Warning: Use only as a standard for designing this data.

Mass production may cause some changes in device characteristics.

(i = 10)

Ω

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