CS48L32 datasheet(25/192 Pages) CIRRUS

25 / 192 page

DS1219F4

Cirrus Logic

CS48L32

4.2 Input Signal Path

Pseudodifferential connection is also possible—this is similar to the configuration shown in Fig. 4-4, but the GND

connection is directly to the microphone (and IN1xN capacitor), instead of via a resistor. The typical connections for

pseudodifferential input are shown in Fig. 4-5.

Analog MEMS microphones can be connected to the CS48L32 in a similar manner to the ECM configurations. Typical

configurations are shown in Fig. 4-6 and Fig. 4-7. In this configuration, the integrated MICBIAS generator provides a

low-noise power supply for the microphones.

Note: The VOUT_MIC pin can also be used (instead of MICBIAS) as a reference or power supply for external

microphones. The MICBIAS outputs are recommended, because they offer better noise performance and

independent enable/disable control.

Figure 4-3. Single-Ended ECM Input

Figure 4-4. Differential ECM Input

Figure 4-5. Pseudodifferential ECM Input

Figure 4-6. Single-Ended MEMS Input

Figure 4-7. Differential MEMS Input

To ADC

VREF

IN1LN,

IN1RN

IN1LP,

IN1RP

ECM

GND

MICBIAS

PGA

–

To ADC

VREF

ECM

GND

MICBIAS

PGA

–

IN1LN,

IN1RN

IN1LP,

IN1RP

To ADC

VREF

ECM

GND

MICBIAS

PGA

–

IN1LN,

IN1RN

IN1LP,

IN1RP

To ADC

VREF

MEMS

Mic

MICBIAS

VDD

OUT

GND

PGA

–

IN1LN,

IN1RN

IN1LP,

IN1RP

To ADC

VREF

MEMS

Mic

MICBIAS

VDD

OUT-P

GND

OUT-N

PGA

–

IN1LN,

IN1RN

IN1LP,

IN1RP

CS48L32 Datasheet(PDF) 25 Page - Cirrus Logic

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