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CS47L24 Datasheet(PDF) 34 Page - Cirrus Logic

Part # CS47L24
Description  Low Power Audio Hub for Wearable Technology
PDF  256 Pages
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Manufacturer  CIRRUS [Cirrus Logic]
Direct Link  http://www.cirrus.com
Logo CIRRUS - Cirrus Logic

CS47L24 Datasheet(HTML) 34 Page - Cirrus Logic

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CS47L24
34
Rev 4.1
CONDITION
DMICCLK
n FREQUENCY
SIGNAL PASSBAND
INn_OSR = 00
1.536MHz
up to 20kHz
INn_OSR = 01
3.072MHz
up to 20kHz
INn_OSR = 10
6.144MHz
up to 96kHz
INn_OSR = 11
768kHz
up to 8kHz
Table 1 DMICCLK Frequency
The microphone bias (MICBIAS) generators provide a configurable low noise output voltage, suitable for powering digital
microphones. The MICBIAS generators are powered from the MICVDD supply. Powering the microphones directly from
MICVDD (instead of MICBIASn) is also supported. However, the MICBIAS outputs are recommended, as these offer
better noise performance and independent enable/disable control.
The voltage reference for each digital microphone interface is selectable, using the INn_DMIC_SUP registers. Each
interface may be referenced to MICVDD, or to the MICBIAS1 or MICBIAS2 levels.
A pair of digital microphones is connected as illustrated in Figure 10. The microphones must be configured to ensure that
the Left mic transmits a data bit when DMICCLK is high, and the Right mic transmits a data bit when DMICCLK is low.
The CS47L24 samples the digital microphone data at the end of each DMICCLK phase. Each microphone must tri-state
its data output when the other microphone is transmitting.
Note that the CS47L24 provides integrated pull-down resistors on the DMICDAT1 and DMICDAT2 pins. This provides a
flexible capability for interfacing with other devices.
Digital Mic
AGND
Digital Mic
VDD
CLK
DATA
VDD
CLK
DATA
CHAN
CHAN
VDD
DMICDATn
DMICCLKn
Digital
Microphone
Interface
Microphone Bias
Generators
MICVDD
MICBIAS1
MICBIAS2
MICVDD supply
Figure 10 Digital Microphone Input



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