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| 型號(hào)： | AS3517-T |
| 廠商： | ams |
| 文件頁數(shù)： | 11/94頁 |
| 文件大小： | 0K |
| 描述： | IC CODEC AFE AUDIO STER 81-CTBGA |
| 標(biāo)準(zhǔn)包裝： | 2,000 |
| 類型： | 音頻編解碼器 |
| 應(yīng)用： | 便攜式音頻，電話 |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 81-TFBGA |
| 供應(yīng)商設(shè)備封裝： | 81-CTBGA（9x9） |
| 包裝： | 帶卷 (TR) |
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AS3517 V17
Data Sheet, Confidential
2003-2007, austriamicrosystems AG, 8141 Unterpremstaetten, Austria-Europe. All Rights Reserved.
www.austriamicrosystems.com
9.1.2
Microphone Inputs (2x)
General
The AFE offers two microphone inputs and 2 low noise microphone voltage supply (microphone bias), voice activation, microphone
connect detection and push button remote control.
Figure 6 Microphone Input
Microphone Preamplifier and Gain Stage
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. electrete
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
Each microphone input generates a supply voltage of 1.5V above HPHCM. The supply is designed for
≤2mA and has a 10mA current
limit. In OFF mode the MICS terminal is pulled to AVDD with 30kOhm. A current of typically 50uA generates an interrupt to inform the
CPU, that a circuit is connected. When using HPCM as headset ground the HP–stage gives the interrupt. After enabling the HP-stage
through the CPU the microphone detection interrupt will follow.
When using the MICxS terminals as ADC-10 input to monitor external voltages the 30kOhm pull-up can be disabled.
Remote Control
Fast changes of the supply current of typically 500uA are detected as a remote button press, and an interrupt is generated. Then the CPU
can start the measurement of the microphone supply current with the internal 10-bit ADC to distinguish which button was pressed. As the
current measurement is done via an internal resistor, only two buttons generating a current of about 0.5mA and 1mA can be detected.
With this 1mA as microphone bias is still available.
Voice Activation
Further a built-in voice activation comparator can actuate an interrupt if microphone input voltage of about 5mVRMS is detected.
Revision 1v3
18
- 93
ams
AG
Technical
content
still
valid
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