CS47L15 datasheet(34/279 Pages) CIRRUS

34 / 279 page

DS1137F2

CS47L15

4.2 Input Signal Path

Note that the CS47L15 provides an integrated pull-down resistor on the DMICDAT pin. This provides a flexible capability

for interfacing with other devices.

Figure 4-11. DMIC Input

Two DMIC channels are interleaved on DMICDAT. The DMIC interface timing is shown in Fig. 4-12. Each microphone

must tristate its data output when the other microphone is transmitting. See Table 3-14 for a detailed timing specification

of the DMIC interface.

Figure 4-12. DMIC Interface Timing

4.2.4.2 IN2 Digital Input (SPKRXDAT)

The IN2 digital input path forms part of a bidirectional interface for external speaker drivers. If the IN2 path is configured

for digital input, two channels of audio data are multiplexed on the SPKRXDAT pin. A timing reference signal is provided

on the SPKCLK pin, which is common to the input (SPKRXDAT) and output (SPKTXDAT) paths of the digital speaker

(PDM) interface.

The SPKCLK frequency is controlled using the OUT5_OSR field, as described in Table 4-55. The input signal timing is

controlled by the IN2_OSR field—this field must be configured for the same frequency as the OUT5_OSR field.

Digital Mic

MICVDD or MICBIAS1x

AGND

Digital Mic

VDD

CLK DATA

VDD CLK DATA

CHAN

VDD

DMICDAT

DMICCLK

Digital

Microphone

Interface

The DMIC inputs are referenced to

MICVDD or MICBIAS1.

The supply for each digital microphone

should provide the same voltage as the

applicable reference.

DMICCLK pin

DMICDAT pin

(Left and right channels interleaved)

Left mic output

Right mic output

Hi-Z

CS47L15 Datasheet(PDF) 34 Page - Cirrus Logic

CS47L15 Datasheet(HTML) 34 Page - Cirrus Logic

Html Pages

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 ...More

Datasheet Download

Link URL