参数资料
型号: AS3658F-BCTP
厂商: ams
文件页数: 106/158页
文件大小: 0K
描述: IC PMU POWER/AUDIO 124-CTBGA
标准包装: 2,500
应用: 便携式设备
电流 - 电源: 7mA
电源电压: 3 V ~ 5.5 V
工作温度: -40°C ~ 85°C
安装类型: 表面贴装
封装/外壳: 124-TFBGA
供应商设备封装: 124-CTBGA(8x8)
包装: 带卷 (TR)
AS3658
Data Sheet Confidential
- Detailed Description- Audio Functions
9.8
Microphone Input
General
The audio front-end offers one microphone inputs and a low noise microphone voltage supply (microphone bias), voice
activation, microphone connect detection and push button remote control.
Figure 49. Microphone Input Block diagram and External Circuit
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Gain Stage & Limiter
The integrated pre-amplifier allows 3 preset gain settings. There is also a limiter which attenuates high input signals
from e.g. electret microphones signal to 1Vp. The AGC has 15 steps with a dynamic range of about 29dB. The AGC is
ON by default but can be disabled by a microphone register bit.
Apart from the microphone pre-amplifier the microphone input signal can further be amplified with 32 @1.5dB
programmable logarithmic gain steps and MUTE. All gains and MUTE are independently programmable. The gain can
be set from –40.5dB to +6dB.
The stage is set to mute by default. If the microphone input is not enabled, the volume settings are set to their default
values. Changing the volume and mute control can only be done after enabling the input.
Supply & Detection
The microphone input generates a supply voltage of 1.5V above AGND. The supply is designed for ≤ 2mA and has a
10mA current limit. In OFF mode the MICS terminal is pulled to AVDD with 30k Ω . A current of typically 50μA generates
an interrupt to inform the CPU, that a circuit is connected. When using the MICS terminal as ADC-10 input to monitor
external voltage the 30k Ω pull-up can be disabled.
Remote Control
Fast changes of the supply current of typically 500μA are detected as a remote button press, and an interrupt is
generated.
Voice Activation
Further a built-in voice activation comparator can actuate an interrupt if microphone input voltage of about 5mVRMS is
detected.
www.austriamicrosystems.com
Revision 1v13
105 - 157
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