NJW1201AFH2 datasheet(29/30 Pages) NISSHINBO

29 / 30 page

NJW1201A

– 29 –

APPLICATION NOTE

[6] 2

nd Volume

nd Volume range is 0dB to –28dB with –2dB steps.

Frequency response of 2

nd Volume depends on capacitor connected to VOL2CAP(pin.16,23).

It shows frequency response of 2

nd Volume in Fing.6-1(2nd Volume=-28dB), Fig6-2(2ndVolume=MUTE).

To flat the frequency response, please choose bigger capacitor.

Fig.6-1

Fig.6-2

But, when power turns on, it takes some charge time to VOL2CAP(pin.16.23)

If 2

nd Volume is switched on charge, Pop noise occurs.

The cause of pop noise is gap of Voltage between Vref and VOL2CAP.

To be fast the charge time, connect smaller capacitor to VOL2CAP.

Fig.6-3.VOL2CAP=1uF

Fig.6-4.VOL2CAP=4.7uF

Fig.6-4.VOL2CAP=10uF

Gain vs Frequency (2nd Volume)

V+=9V, 2ndVOL=-28dB, Vin=1Vrms, Ta=25oC

-60

-50

-40

-30

-20

-10

100

1000

10000

100000

Frequency (Hz)

2ndVOL=MUTE

C=1uF

2ndVOL=MUTE

C=10uF

2ndVOL=MUTE

C=4.7uF

Gain vs Frequency (2nd Volume)

V+=9V, 2ndVOL=MUTE, Vin=1Vrms, Ta=25oC

-120

-100

-80

-60

-40

-20

100

1000

10000

100000

Frequency (Hz)

2ndVOL=MUTE

C=10uF

2ndVOL=MUTE

C=1uF

2ndVOL=MUTE

C=4.7uF

1st&2ndVOL=MUTE

DC Voltage vs time (2nd Volume)

V+=0 ---> 9V, Ta=25oC

-0.5

00.5

11.5

time (s)

VOL2CAP=1uF

Vdc at VOL2CAP

Vref

DC Voltage vs time (2nd Volume)

V+=0 ---> 9V, Ta=25oC

-0.5

0.5

1.5

time (s)

VOL2CAP=4.7uF

Vref

Vdc at VOL2CAP

DC Voltage vs time (2nd Volume)

V+=0 ---> 9V, Ta=25oC

-0.5

0.5

1.5

time (s)

VOL2CAP=10uF

Vdc at VOL2CAP

Vref

NJW1201AFH2 Datasheet(PDF) 29 Page - Nisshinbo Micro Devices Inc.

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