AN7199 Panasonic Semiconductor, AN7199 Datasheet - Page 14

• Manufacturer Part Number: AN7199
• Description: Dual 20 W BTL power IC for car audio
• Manufacturer: Panasonic Semiconductor

AN7199Z
14
[2] Application note (continued)
8. Mute Function
9. Voltage gain
Technical Information (continued)
V
1) The mute-on/off is possible by making pin 7 (the muting terminal) high or low.
2) The muting circuit is as shown in figure 7. The amplifier gain including attenuator block is given in the
3) The threshold voltage of V
4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In
5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output
MUTE
following equation :
figure 7 22 k , 1 F), the above mentioned times are as follows :
microcomputer (5 V), (that is, 13.2 V separate power supply), it is necessary to change CR values because the
above times change.
offset because it may release the shock noise.
those values by the addition of an external resistor.
5 V
0 V
G
From the above equation, the amplifier gain can be made as 0 time by setting I
Mute-off : approx. 1 V or less
Mute-on : approx. 3 V or more
Attack time
Recovery time : Approx. 40 ms
However, the control voltage of V
The voltage gain is fixed at 34 dB for the AN7198Z, and 40 dB for the AN7199Z. It is not possible to change
V
Mute/off
Mute/on
I
I
1
2
50
22 k
: Approx. 30 ms
Original gain
1 F
MUTE
Input
is as follows :
7
MUTE
200
is assumed to be 5 V. When it is not directly controlled by
Figure 7
ICs for Audio Common Use
Attenuator block
I
I
1
1
I
I
1
2
1
at 0 mA at muting.
approx.120 A
approx.120 A
I
I
2
2
Output stage
Output stage