NJU72014RB2 查看數據表（PDF） - Japan Radio Corporation

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NJU72014RB2

2Vrms Ground Referenced Stereo Line Amplifier with LPF

Japan Radio Corporation  

NJU72014

1.1 External parts

1.1.1 Input coupling capacitors Ci (C2, C8)

The input coupling capacitor (Ci) and the total of the external resistance (R1, R3) and the input

resistance (Rin=218kΩ typ.) for the non-inverted terminal form a high-pass filter with the corner

frequency determined in [fc=1/(2π x (R1+218kΩ) x Ci)). It is necessary to adjust 1uF or more.

1.1.2 Flying capacitor (C4)

Use capacitors with a low-ESR (ex. ceramic capacitors) for optimum performance. Design to provide

low impedance for the wiring between CP terminal (4pin), CN terminal (5pin), and the flying capacitor

(C4).

C4=1uF

CP(4pin)

CN(5pin)

Fig.2 The NJU72014 block diagram (4pin, 5pin)

1.1.3 Hold capacitor (C6)

Use capacitors with a low-ESR (ex. ceramic capacitors) for optimum performance. Design to provide

low impedance for the wiring between the hold capacitor (C6), V- terminal (6pin) and the GND on the

PCB.

Separate the GND pattern connecting to the hold capacitor (C6) from that connecting to the GND

terminal (8pin), thus suppressing the influence of switching noise by removing the common impedance

of the GND wiring.

Design no short-circuits of V- terminal (6pin) and V+ terminal (3pin) on the PCB pattern.

V-(6pin)

C6

GND(8pin)

Fig.3 The NJU72014 block diagram (6pin, 8pin)

–5–

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