CRD42L51 Cirrus Logic Inc, CRD42L51 Datasheet - Page 30

• Manufacturer Part Number: CRD42L51
• Description: Ref Bd Low-voltage Stereo Codec
• Manufacturer: Cirrus Logic Inc

30
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
//
//
Figure 9. MIC Input Mix w/Common Mode Rejection
2.15 V
0.35 V
2.15 V
0.35 V
1.25 V
1.25 V
Full-Scale Differential Input Level (MICMIX=1)
fc
= (AINxA - AINxB) = 3.6 V
=
---------------------------------------------- -
2π 50 kΩ
Figure 10. Differential Input
(
+
1
PP
+
= 1.27 V
MICIN1
) 1 µF
MICIN2
(
RMS
17
18
52,
)
“MIC Control (Address 05h)” on page
=
3.18 Hz
Σ
AINxB
AINxA
MICBIAS
VA
2.5 V
20
53.
CS42L51
DS679F1