BU7242YFVM-C Datasheet, PDF (15/26 Pages) Rohm – Input/Output Full Swing Low Supply Current CMOS Operational Amplifier

BU7242YFVM-C
Datasheet
Application Information – continued
8. Oscillation by Output Capacitor
Please pay attention to the oscillation by output capacitor and in designing an application of negative feedback loop
circuit with these ICs.
When the amplifier is used with a full feedback loop, a capacitive load must be up to 100pF because there is a risk of
oscillation.
The following figure shows the frequency characteristics for each load capacitance.
50
20
40
30
20
150pF
10
100pF
5pF
0
10³
10⁴
10⁵
10⁶
10⁷
Frequency [Hz]
Figure 34. Voltage Gain vs Frequency
(VDD=3.0V, Gv=40dB)
150pF
10
100pF
0
5pF
-10
-20
10³
10⁴
10⁵
10⁶
10⁷
Frequency [Hz]
Figure 35. Voltage Gain vs Frequency
(VDD=3.0V, Gv=0dB)
70
60
50
40
30
20
10
0
10
100
1000
Load Capacitance [pF]
Figure 36. Phase Margin vs Load Capacitance
(VDD=3.0V, Gv=40dB)
70
60
50
40
30
20
10
0
10
100
1000
Load Capacitance [pF]
Figure 37. Phase Margin vs Load Capacitance
(VDD=3.0V, Gv=0dB)
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