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參數(shù)資料
| 型號： | AS3510 |
| 廠商： | ams |
| 文件頁數(shù)： | 2/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC CODEC AFE ANALOG 49-CABGA |
| 標準包裝： | 476 |
| 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： | 49-WFBGA |
| 供應(yīng)商設(shè)備封裝： | 49-CSBGA（7x7） |
| 包裝： | 托盤 |
Product Brief AS3510
Rev. 1v2, June 2004
CONFIDENTIAL
Page 9 of 19
Microphone Path
Block Description
This block converts a differential microphone signal into
digital and does a synchronisation to the DAC I2S input
clocks. The SigmaDelta converter clock gets derived from
MCLK. For LRCK=32kHz
MCLK=4.096MHz, the
SD_CLK is 1.024MHz which gives with decimation to 14 bit
a sampling rate of 8kHz. Since the I2S signals for the DAC-
path is 4 times higher, each ADC-output-code will be
presented 4 times in both channels (left, right) the same.
For
LRCK=48kHz
MCLK=6.144MHz,
the
ADC
conversion rate will be 12kHz. Due to this synchronisation
the transfer of the ADC data is possible with just one extra
digital output pin which makes the digital interface very
efficient.
The microphone amplifier can be programmed to three
different gain values 28dB/ 34dB/ 40dB to adjust the circuit
to the used microphone. The microphone amplifier includes
a softclip function that reduces the gain when the input
voltage range of the ADC is violated.
The fullscale ADC input range is 1.157Vp differential with
AVDD=2.9V.
The softclip references are +/-0.434V which gives a
useable ADC-range of 0.868Vp differential. This gives a
nominal mic input voltage range of 34.72 / 17.36 / 8.68mVp
or 24 /12 / 6mVrms for the three micamp gain settings.
SoftClip is done with 15 steps of –1dB.
ams
AG
Technical
content
still
valid
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