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參數(shù)資料
| 型號(hào)： | AN7199Z |
| 廠商： | PANASONIC CORP |
| 元件分類： | 音頻／視頻放大 |
| 英文描述： | Dual 20 W BTL power IC for car audio |
| 中文描述： | 25 W, 2 CHANNEL, AUDIO AMPLIFIER, PZFM15 |
| 封裝： | ZFM-15 |
| 文件頁數(shù)： | 14/17頁 |
| 文件大?。?/td> | 131K |
| 代理商： | AN7199Z |
AN7199Z
ICs for Audio Common Use
14
I
Technical Information (continued)
[2] Application note (continued)
8. Mute Function
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
following equation :
I
1
×
50
I
2
Original gain
From the above equation, the amplifier gain can be made as 0 time by setting I
1
at 0 mA at muting.
3) The threshold voltage of V
MUTE
is as follows :
Mute-off: approx. 1 V or less
Mute-on : approx. 3 V or more
G
V
=
Figure 7
4) Attack time and recovery time can be changed by the external CR of pin 7. For recommended circuits (In
figure 7 22 k
, 1
μ
F), the above mentioned times are as follows :
Attack time
: Approx. 30 ms
Recovery time : Approx. 40 ms
However, the control voltage of V
MUTE
is assumed to be 5 V. When it is not directly controlled by
microcomputer (5 V), (that is, 13.2 V separate power supply), it is necessary to change CR values because the
above times change.
5) When the attack time and recovery time are set at 20 ms or less, pay attention to the IC with larger output
offset because it may release the shock noise.
9. Voltage gain
The voltage gain is fixed at 34 dB for the AN7198Z, and 40 dB for the AN7199Z. It is not possible to change
those values by the addition of an external resistor.
I
1
=
approx.120
μ
A
I
2
=
approx.120
μ
A
Output stage
Input
Output stage
Attenuator block
Mute/off
Mute/on
200
7
22 k
5 V
0 V
1
μ
F
I
2
I
1
I
2
I
1
V
MUTE
←
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