CS47L35 datasheet(230/300 Pages) CIRRUS

230 / 300 page

230

DS1085F3

CS47L35

5.1 Recommended External Components

Figure 5-3. Single-Ended and Differential Analog MEMS Microphone Connections

DMIC connection to the CS47L35 is shown in Fig. 5-4. Note that ceramic decoupling capacitors at the DMIC power supply

pins may be required—refer to the specific recommendations for the application microphones.

Figure 5-4. DMIC Connection

Each MICBIAS generator can operate in Regulator Mode or in Bypass Mode. See Section 4.19 for details of the MICBIAS

generators.

In Regulator Mode, the MICBIAS regulators are designed to operate without external decoupling capacitors. The

regulators can be configured to support a capacitive load if required (e.g., for DMIC supply decoupling). The compatible

load conditions are detailed in Table 3-11.

If the capacitive load on MICBIAS1 or MICBIAS2 exceeds the specified conditions for Regulator Mode (e.g., due to a

decoupling capacitor or long PCB trace), the respective generator must be configured in Bypass Mode.

The maximum output current for each MICBIAS regulator is noted in Table 3-11. This limit must be observed for each pair

of MICBIASnx outputs, especially if more than one microphone is connected to a single regulator. Note that the maximum

output current differs between Regulator Mode and Bypass Mode. The MICBIAS output voltage can be adjusted using

To ADC

VREF

IN1xN,

IN2xN

IN1xP,

IN2xP

MEMS

Mic

MICBIAS

VDD

OUT

GND

PGA

–

MEMS

Mic

To ADC

VREF

IN1xN,

IN2xN

IN1xP,

IN2xP

MICBIAS

VDD

OUT-P

GND

OUT-N

PGA

–

Digital Mic

MICVDD or MICBIASnx

AGND

Digital Mic

VDD

CLK DATA

VDD CLK DATA

CHAN

VDD

DMICDATn

DMICCLKn

Digital

Microphone

Interface

The DMIC inputs are referenced to

MICVDD, MICBIAS1B, MICBIAS2A, or

MICBIAS2B.

The supply for each digital microphone

should provide the same voltage as the

applicable reference.

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