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參數(shù)資料
| 型號： | MSA180 |
| 廠商： | OKI SEMICONDUCTOR CO., LTD. |
| 英文描述： | Piezo Speaker Amplifier |
| 中文描述： | 壓電揚聲器放大器 |
| 文件頁數(shù)： | 8/17頁 |
| 文件大?。?/td> | 147K |
| 代理商： | MSA180 |
8/16
MSA180
Semiconductor
Supplemental Information When Using a Voice Signal on the MODE1 Pin
When using the voice signal on MODE1, as in the circuit below, care must be taken regarding the
voice input level. Application of the voice signal below V
IH1
level to the MODE1 pin causes the
MSA180 to switch into standby mode, interrupting the voice reproduction flow, and causing
undesired noises.
SP
C1
A
IN
MSA180
V
DD
BASE
MODE2
V
CC
SP
GND
MODE1
PIEZO SPEAKER
R1
Signal
When using a voice signal lower than V
IH
, refer to the circuit below. With a low-pass filter consisting
of R2 and C2, voice levels lower than V
IH1
are passed through. However, select values for R2 and C2
such that the input voltage on MODE1 is greater than V
IH2
.
The cutoff frequency of the low-pass filter is calculated as follows:
f
C
=
2
p ￥
R2
￥
C2
1
[Hz]
For instance, if the cutoff frequency is 50 Hz, C2 is 0.1
m
F and R2 is 30 k
W
. For a lower cutoff frequen-
cy, use a larger value for C2 or R2.
SP
C1
C2
A
IN
MSA180
V
DD
BASE
MODE2
V
CC
SP
GND
MODE1
PIEZO SPEAKER
R2
R1
Signal
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