NJM2719V データシートの表示（PDF） - Japan Radio Corporation

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NJM2719V

Low Noise, High-Speed Dual Operational Amplifier

Japan Radio Corporation  

NJM2719

■ APPLICATION

●Stability

Generally, when driving a large capacitive load in low closed-loop gain or unity-gain configurations, circuit stability is

reduced. In the case of using the NJM2719 for these configurations, it is necessary to care about unwanted oscillation.

An effective way to improve stability and to avoid oscillation is to add an isolation resistor as shown in Figure 1.

Figure 2 shows required resistor values (RISO) for stability versus load capacitances (CL) in the unity-gain configuration

(Figure 1). To ensure the stability, add a larger isolation resistor in Figure 2. (Resistor values in Figure2 are reference

values when parasitic capacitance of an evaluation board is minimized.)

25

Supply Voltage ±5V

20

-

VIN

+

15

RISO

VOUT

10

CL

5

Supply Voltage ±2.5V

Figure 1.

0

0

20

40

60

80

100

CL [pF]

Figure 2. Required Isolation Resistor values for

stability, RISO[Ω], versus Capacitive Loads,

CL[pF]. (GV=0dB)

Ver.2011-02-04

-9-

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