Cirrus-logic CS53L21 Manuel d'utilisateur télécharger pdf (Page 24)

24 DS700PP1

CS53L21

The MICBIAS series resistor must be selected based on the requirements of the particular microphone

used. The MICBIAS output pin is selected using the MICBIAS_SEL bit.

Software

Controls:

“Interface Control (Address 04h)” on page 43, “MIC Control (Address 05h)” on page 44.

2π 50 kΩ()1 μF()

----------------------------------------------- 3 . 1 8 H z==

MICIN1

MICIN2

MICBIAS

Figure 8. MIC Input Mix w/Common Mode Rejection

Full-Scale Differential Input Level (MICMIX=1)

= (AINxA - AINxB) = 3.6 V

= 1.27 V

RMS

AINxA

AINxB

2.15 V

1.25 V

0.35 V

2.5 V

2.15 V

1.25 V

0.35 V

Figure 9. Differential Input

1 2 ... 19 20 21 22 23 24 25 26 27 28 29 ... 65 66

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Cirrus-logic CS53L21 Manuel d'utilisateur Page 24