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參數(shù)資料
| 型號(hào)： | AK5356VN |
| 廠商： | Asahi Kasei Microsystems Co.,Ltd |
| 元件分類： | 圓形連接器 |
| 英文描述： | Circular Connector; No. of Contacts:42; Series:MS27484; Body Material:Aluminum; Connecting Termination:Crimp; Connector Shell Size:16; Circular Contact Gender:Socket; Circular Shell Style:Straight Plug; Insert Arrangement:16-42 RoHS Compliant: No |
| 中文描述： | 低功耗20位ADC，具有麥克風(fēng)放大器 |
| 文件頁數(shù)： | 14/22頁 |
| 文件大?。?/td> | 156K |
| 代理商： | AK5356VN |
ASAHI KASEI
[AK5356]
MS0171-E-00
2002/08
- 14 -
n
MIC Block
1. Pre-Amp
The Pre-Amp is non-inverting amplifier and internally biased to MVCM voltage with 100k
(typ.). Gain of the
Pre-Amp can select +13dB, +18dB, +28dB or +33dB by PREG1-0 bits.
Pre-Amp gain value of L/R channels change by zero crossing detection or timeout independently. Timeout cycle is fixed
to 2048/fs (=46.8ms @ fs = 44.1kHz). Zero crossing detection is done by IPGA block. When PMADC bit is “0”, gain of
Pre-Amp changes immediately.
An external capacitor is needed to cancel DC gain. The cut-off frequency is determined by an internal resistor (Ri) and
an external capacitor (C1).
+
Pre-Amp
PREL pin
PRER pin
-
+
Rf
Ri
C1
To MICL/MICR pins
Figure 9. Pre-Amp
2. Power Supply for MIC
The power supply for microphone device is supplied from MPWR pin. The output voltage is typically 2.16V(= 0.8 x
MVDD at MVDD=2.7V). MPWR pin can supply the current up to 1mA. When PMMIC bit is “0”, the output current is
not supplied.
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