MB90F474LPF datasheet(109/118 Pages) FUJITSU

109 / 118 page

MB90470 Series

109

Notes :

• VCC = VCC3 = VCC5

• The relative error increases as |AVRH − AVSS| is reduced.

• Observe the following conditions in applying output impedance on the external circuits of the analog

input.

Output impedance on the external circuit is recommended to be 6 k

Ω or less.

If external capacitance is used, it is recommended that this be several thousand times the level of internal

capacitors in view of the effects of voltage division between the external capacitor and the interior of the

chip.

• If the output impedance of the external circuits is too high, the analog voltage sampling time may be

insufficient.

(sampling time

= 3.00 µs at machine clock frequency 20 MHz) .

< Reference Data >

• Analog Input Circuit

• A/D Operating Frequency Restrictions

Supply voltage

A/D conversion time [

µµµµs]

Machine clock frequency

3.6 V

≥ AVCC ≥ 3.0 V

4.650

20 MHz

3.6 V

≥ AVCC ≥ 2.7 V

5.813

16 MHz

2.7 V

> AVCC ≥ 2.6 V

6.643

14 MHz

2.6 V

> AVCC ≥ 2.5 V

7.750

12 MHz

2.5 V

> AVCC ≥ 2.4 V

8.455

11 MHz

2.4 V

> AVCC ≥ 2.3 V

9.300

10 MHz

2.3 V

> AVCC ≥ 2.2 V

11.63

8 MHz

2.2 V

> AVCC ≥ 2.1 V

15.50

6 MHz

2.1 V

> AVCC ≥ 2.0 V

23.25

4 MHz

2.0 V

> AVCC ≥ 1.9 V

46.50

2 MHz

1.9 V

> AVCC ≥ 1.8 V

93.00

1 MHz

RON1

RON2

RON3

RON4

Analog input

Comparator

Sample and hold circuit

Note : Values shown here are intended as guidelines.

• Model analog input circuit

RON1 : approx. 5 k

Ω

RON2 : approx. 617

Ω

RON3 : approx. 617

Ω

RON4 : approx. 473

Ω

C0 : approx. 35 pF

C1 : approx. 2 pF

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