MB90F334APMC datasheet(59/72 Pages) FUJITSU

59 / 72 page

MB90330A Series

DS07-13734-7E

Notes :

• About the external impedance of the analog input and its sampling time

• A/D converter with sample and hold circuit. If the external impedance is too high to keep sufficient sampling

time, the analog voltage charged to the internal sample and hold capacitor is insufficient, adversely affecting

A/D conversion precision.

• To satisfy the A/D conversion precision standard, consider the relationship between the external impedance

and minimum sampling time and either adjust the resistor value and operating frequency or decrease the

external impedance so that the sampling time is longer than the minimum value.

• If the sampling time cannot be sufficient, connect a capacitor of about 0.1 μF to the analog input pin.

• About errors

|AVRH| becomes smaller, values of relative errors grow larger.

Analog input

Comparator

• Analog input circuit model

During sampling : ON

Note : The values are reference values.

MB90333A

MB90F334A

MB90F335A

MB90V330A

1.9 k

Ω (Max)

1.9 k

Ω (Max)

1.9 k

Ω (Max)

1.9 k

Ω (Max)

32.3 pF (Max)

25.0 pF (Max)

32.3 pF (Max)

100

MB90333A/

MB90V330A

MB90F334A

MB90F335A

012

456

MB90333A/

MB90V330A

MB90F334A

MB90F335A

(External impedance

= 0 kΩ to 100 kΩ)

Minimum sampling time [

μs]

(External impedance

= 0 kΩ to 20 kΩ)

Minimum sampling time [

μs]

• The relationship between the external impedance and minimum sampling time

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