ADAU1373BCBZ-R7 datasheet(52/296 Pages) AD

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ADAU1373

Rev. 0 | Page 52 of 296

Bits

Bit Name

Settings

Description

DPLLx_LOCKED

DPLLx lock (read-only bit). This bit is stored in Register 0x2E for PLLA (Bit 3) and Register

0x35 for PLLB (Bit 3).

0: DPLLx unlocked (default).

1: DPLLx locked.

PLLx_LOCKED

APLL lock (read-only bit). This bit is stored in Register 0x2E for PLLA (Bit 2) and Register

0x35 for PLLB (Bit 2).

0: APLL unlocked (default).

1: APLL locked.

DPLLx_BYPASS

DPLL bypass bit. This bit is stored in Register 0x2E for PLLA (Bit 1) and Register 0x35 for

PLLB (Bit 1).

0: DPLLx not bypassed (default).

1: DPLLx bypassed.

PLLx_EN

APLL enable bit. This bit is stored in Register 0x2E for PLLA (Bit 0) and Register 0x35 for

PLLB (Bit 0).

0: APLL disabled (default).

1: APLL enabled.

DIGITAL MICROPHONE INPUT INTERFACE

ADAU1373

IOVDD4

DMIC1_2_DATA

DMIC_CLK

DMIC3_4_DATA

DMIC1

DMIC2

0.1µF

The ADAU1373 supports the digital microphone inputs.

The digital microphone output data can be connected at the

DMIC1_2_DATA and DMIC3_4_DATA pins (Ball B4 and Ball C6,

respectively). The bit clock for the digital microphone is avail-

able at the DMIC_CLK pin (Ball A4). The bit clock is fixed at

64 × fS (see Figure 5 for the waveforms).

Four digital microphones or two stereo pairs of digital micro-

phones can be connected to the ADAU1373 (see Figure 95

and Figure 96). The single pair of digital microphones shares

the decimator with ADC; therefore, when using DMIC1_2_DATA,

the ADC is not available. However, DMIC3_4_DATA has a

separate decimator and, therefore, can be used independently.

Figure 96. Digital Microphone Connection Diagram for Two Microphones

To enable digital microphone support, the digital recording engine

must be enabled first, using Register 0xEB. The Digital Micro-

phone 1/Digital Microphone 2 engine can be enabled using Bit 2

of Register 0xEB, and the Digital Microphone Input 3/Digital

Microphone 4 engine can be enabled using Bit 3 of Register 0xEB.

ADAU1373

IOVDD4

DMIC1_2_DATA

DMIC_CLK

DMIC3_4_DATA

DMIC1

DMIC2

0.1µF

DMIC3

DMIC4

After the recording engine is enabled, the digital microphone

input block can be enabled using Register 0xE2, Bit 0 for Input 1/

Input 2 (DMIC1_2_DATA) and Bit 2 for Input 3/Input 4

(DMIC3_4_DATA). The digital microphone data input is then

routed through the decimator and the recording engine to

digital mix/mux.

By default, the digital microphone inputs are configured as a stereo

pair. If using only one microphone, use Register 0xE2, Bit 7, to

set it as mono input.

The bit clock required for the digital microphone is available at

the DMIC_CLK pin (Ball A4), and the drive capability can be

set using Register 0xE9, Bit 3.

Figure 95. Digital Microphone Connection Diagram for Four Microphones

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