BA3131FS

Standard ICs

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!Operation notes

(1) Pin 13 is the reference output pin, from which 1 / 2 Vcc is output. The value for the bypass capacitor should be

determined based on the desired characteristics. A value between 500pF and 1

µF may produce oscillation, so if AC

grounding is being used, always use a bypass capacitor with a value of at least 10

µF.

Also, Pin 12 is designated for reference circuit input, so if reference output is being used, always use a bypass capacitor

for AC grounding. (We recommend a bypass capacitor with a value of 22

µF.)

•Reference data (these values are intended only as a reference, and performance is not guaranteed)

10

– 35

150

22

– 42

300

47

– 48

550

Pin 12 bypass capacitor (

µF)

capacitor 100

µF, output smoothing voltage.

(2) This IC offers stability even at low gain (0 to 20dB), but a capacitance load of 200pF or higher may cause oscillation

(the phase margin at a capacitance of 200pF is 10

° typ. (Ta = 85°C, 0dB point) ). Consequently, please make sure

sufficient care is taken in terms of the capacitance load.

When using a 0dB buffer, as shown in the application example (Figure 13), introducing a bias resistance of several k

Ω to

the negative input (R11 and R12 in Figure 13, indicated as circled items) results in greater stability in terms of the

capacitance load.

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!Truth value table

H

H

Corresponds to

µCOM output

ch1

Conditions

SW1 (8pin)

SW2 (9pin)

H

L

ch2

L

H

ch3

L

L

OFF