AN7199 Просмотр технического описания (PDF) - Panasonic Corporation

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AN7199

Dual 20 W BTL power IC for car audio

Panasonic Corporation 

ICs for Audio Common Use

AN7199Z

s Technical Information (continued)

[2] Application note (continued)

10. Beep sound input function

1) The application circuit using the beep sound input is shown in figure 8. Connect the beep signals from the

microcomputer to pin 10 via the capacitor C1 for DC cut and the resistor R1 for voltage gain adjustment.

2) The voltage gain of beep sound terminal is approx. −6.2 dB. In the setting value of figure 8, it becomes approx.

−19.7 dB (f = 1 kHz).

3) The beep sound is outputted to the output, terminals pin 2 and pin 15.

AN7198Z

AN7199Z

Rnf

600 Ω

300 Ω

GVA

28 dB

34 dB

Rnf

VREF = 6.3 V

GVA

2

C1 47 kΩ

Beep input

Rnf

0.022 µF R1

2

GVBEEP = 1/jωC1+R1+7.8 Κ+ 15 k+Rnf × GVA

2

10 7.8 kΩ

VREF = 6.3 V

15 kΩ

15 kΩ

Rnf

15

GVA

Figure 8

11. Two IC use

Figure 9 shows the application circuit example when two ICs are used :

Power supply

2 200 µF

10 kΩ

Out(RR)

Standby

10 kΩ

Mute

2.2 µF

22 µF to 47 µF

In(RR)

In(FR)

In(RL)

In(FL)

S-GND

0.022 µF

Beep

47 kΩ

10 kΩ

Out(FR)

10 kΩ

Out(RL)

10 kΩ

Figure 9

Out(FL)

15

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