BA3131 Ver la hoja de datos (PDF) - ROHM Semiconductor
Número de pieza
componentes Descripción
Fabricante
BA3131
ROHM Semiconductor
BA3131 Datasheet PDF : 9 Pages
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Standard ICs
BA3131FS
!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 1µF may produce oscillation, so if AC
grounding is being used, always use a bypass capacitor with a value of at least 10µF.
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 22µF.)
•Reference data (these values are intended only as a reference, and performance is not guaranteed)
Pin 12 bypass capacitor (µF) Ripple rejection ratio (fIN = 100 Hz) (dB) Output rise time (ms)∗
10
– 35
150
22
– 42
300
47
– 48
550
∗ Test conditions: When power supply is on (VCC = 8V), time equal to 90% of VCC bypass capacitor,Pin 13 bypass
capacitor 100µF, 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 kΩ to
the negative input (R11 and R12 in Figure 13, indicated as circled items) results in greater stability in terms of the
capacitance load.
!Truth value table
ch1
ch2
ch3
OFF
Conditions
SW1 (8pin)
H
H
L
L
Corresponds to
SW2 (9pin)
H
L
H
L
µCOM output
∗ “H†when the applied voltage at pins 8 and 9 is 2.0V or more, and “L†when it is 1.0V or less.
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