AK5356VN 데이터 시트보기 (PDF) - Asahi Kasei Microdevices

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AK5356VN

Low Power 20-Bit ADC with MIC-Amp & PGA

Asahi Kasei Microdevices 

ASAHI KASEI

[AK5356]

n MIC Block

1. Pre-Amp

The Pre-Amp is non-inverting amplifier and internally biased to MVCM voltage with 100kΩ (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).

C1

+

To MICL/MICR pins

Rf

Ri

PREL pin

PRER pin

-

+

Pre-Amp

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.

MS0171-E-00

- 14 -

2002/08

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