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