Maxim > 方案 > 蜂窝手机
麦克风放大器
Maxim提供各种低功耗、高度集成的麦克风放大器，具有业内领先的PSRR指标和超低THD+N。集成麦克风偏置电路省去了额外的电源，简化系统设计、并降低成本。可提供单/双通道、单端或差分输入，Maxim的麦克风放大器是笔记本电脑设计的理想选择。
MAX9890杂音抑制电路消除了音频装置在通/断过程中的瞬态噪声。传统的耳机放大器必需配合一个大尺寸的隔直流电容，在这种设计中增加一个杂音抑制器可以获得“安静”的音频性能。
| Key Specifications:
Microphone Amplifiers |
| Part Number |
Number of Channels |
Supply Voltage (min) (V) |
Supply Voltage (max) (V) |
Quiescent Supply Current (typ) (mA) |
THD+N (%) |
Input Noise-Voltage Density (nV/√Hz) |
PSRR (db) |
Input Type |
External Gain |
Fixed Gain (min) (|V/V|) |
Fixed Gain (max) (|V/V|) |
Microphone Bias |
|
MAX9814
|
1
|
2.7
|
5.5
|
3.1
|
0.04
|
30
|
55
|
Single Ended
|
No
|
100
|
1,000
|
Yes
|
|
MAX9812H
|
1
|
4.5
|
5.5
|
0.23
|
0.015
|
40
|
100
|
Single Ended
|
No
|
10
|
10
|
Yes
|
|
MAX9812L
|
1
|
2.7
|
3.6
|
0.23
|
0.04
|
40
|
100
|
Single Ended
|
No
|
10
|
10
|
Yes
|
|
MAX9813H
|
2
|
4.5
|
5.5
|
0.23
|
0.015
|
40
|
100
|
Single Ended
|
No
|
10
|
10
|
Yes
|
|
MAX9813L
|
2
|
2.7
|
3.6
|
0.23
|
0.04
|
40
|
100
|
Single Ended
|
No
|
10
|
10
|
Yes
|
|
MAX4465
|
1
|
2.4
|
5.5
|
0.024
|
0.02
|
80
|
112
|
Single Ended
|
Yes
|
-
|
-
|
No
|
|
MAX4466
|
1
|
2.4
|
5.5
|
0.024
|
0.03
|
80
|
112
|
Single Ended
|
Yes
|
-
|
-
|
No
|
|
MAX4467
|
1
|
2.4
|
5.5
|
0.024
|
0.02
|
80
|
112
|
Single Ended
|
Yes
|
-
|
-
|
Yes
|
|
MAX4468
|
1
|
2.4
|
5.5
|
0.024
|
0.03
|
80
|
112
|
Single Ended
|
Yes
|
-
|
-
|
Yes
|
|
MAX4469
|
2
|
2.4
|
5.5
|
0.024
|
0.02
|
80
|
112
|
Single Ended
|
Yes
|
-
|
-
|
No
|
| See All Microphone Amplifiers (14) |
|
