Cirrus-logic CRD48L10 Manuel d'utilisateur télécharger pdf (Page 40)

Chapter 12

Using Analog MEMS Microphones

When shipped, the CRD48L10-4in4out is configured to work with ECM microphones. The CS472L73 provides a bias

voltage of +2.0 V to +2.75 V to the MIC1 and MIC2 inputs through the J8 and J9 jumpers. The exact bias voltage is

configurable through the MIC_BIAS_CTRL bit within the CS42L73 registers. The AMEMS microphone provides its own

bias level, so J8 and J9 need to be removed to use the AMEMS Microphone module.

Figure 12-1. MIC Bias Jumpers

The CRD48L10-4in4out includes two styles of Analog MEMS daughter cards. AMEMS BRD 1 and AMEMS BRD 2 are

footprint compatible with the ADMP504. AMEMS BRD 3 and AMEMS BRD 4 are footprint compatible with the ADMP401.

The AMEMS daughter cards are shown in Fig. 12-2.

Figure 12-2. AMEMS Daughter Cards

Microphones are not mounted on these boards. The customer can attach any microphone matching the footprints

provided. Once microphones have been mounted on daughter cards, they can be wired to the AMEMS HDMI daughter

card, as shown in Fig. 12-3, and then connected to the CRD48L10-4in4out using a standard HDMI Type A > HDMI Type

D (Micro) cable, as shown in Fig. 12-4.

Table 12-1. MIC Bias Jumpers

Header Voltage Signal

J8 +2.0 V – +2.75 V MIC1 Bias Voltage from CS42L73 (PIN1), MIC1 (PIN2)

J9 +2.0 V – +2.75 V MIC2 Bias Voltage from CS42L73 (PIN1), MIC2 (PIN2)

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Cirrus-logic CRD48L10 Manuel d'utilisateur Page 40