AN7198Z 查看數據表（PDF） - Panasonic Corporation
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AN7198Z Datasheet PDF : 20 Pages
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ICs for Audio Common Use
AN7198Z
s Technical Information (continued)
3. Application note (continued)
11) Two IC use (continued)
(1) Supply terminal
Short-circuit the terminals with each other and insert an electrolytic capacitor of approx. 2200 µF into the
supply terminals. However, if sufficient characteristics of the ripple rejection can not be obtained, use an
even larger capacitor or insert a 2200 µF capacitor into each IC.
The best sound quality can be obtained by inserting a 2200 µF capacitor near the terminal of each IC.
(2) Standby terminal (pin 5)
Even if the standby terminals are connected with each other, there is no abnormal operation. Connect with
the microcomputer after connecting the standby pins with each other. At that time, the current flowing into
the standby terminal is twice as large as the current which is described in 1) Standby function.
(3) Muting terminal (pin 7)
An abnormal operation does not occur even if the muting terminals are short-circuited with each other.
The muting time constant changes when two ICs connection is made. If the CR constants are set at twice or
1/2 time respectively, the time constant value becomes as same as the value when one IC is used.
In terms of safety design, taking advantage of the fact that in mute-on, a large current is difficult to flow
and it is difficult to cause the destruction, it is designed so that the mute terminal will become high when an
abnormality such as short circuit to VCC or short circuit to GND takes place. (To avoid the influence of IC in
an abnormal state in using two ICs).
Do not connect a microcomputer directly to the mute terminal because the mute terminal voltage rises to
approx. 12 V at that time.
(4) Beep sound input terminal (pin 10)
Even if the beep sound input terminals are short circuited each other, that does not result in an abnormal operation.
However, if there is a temperature difference between ICs, there may be a fluctuation of the output offset.
In order to avoid such a phenomenon, connect the ICs with each other through a resistor (47 kΩ).
(5) Ripple filter terminal (pin 12)
Even if the ripple filter terminals are short circuited each other, that does not result in an abnormal operation.
However, if the standby of each IC is individually controlled, the short-circuiting is not allowed. Use the
circuit after connecting a capacitor (33 µF) to each IC.
12) Precautions on misuse
(1) Erroneous connection in the case of short circuit to VCC and short circuit to GND or load short-circuit
The AN7198Z/99Z have the breakdown voltage of 20 V or more when short circuit to VCC or load short-
circuit occur. However, there is a possibility of destruction, then smoke emission and ignition under a special
condition. Avoid misuse and erroneous connection of the circuit.
(2) Power supply surge
The power supply surge breakdown voltage is evaluated by the test circuit shown in Figure 10 and the surge
waveform as shown in Figure 11 is evaluated.
The withstanding capability against power supply surge is 80 V for the AN7198Z/99Z.
1 Ω ±1% 20 W
Surge voltatge
D.U.T
Figure 10. Power supply surge test circuit
VP
0.63 VP
0.37 VP
0V
1 ms
6 ms
100 ms
Figure 11. Surge waveform
17
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