Analog Devices Inc. ADAU1381BCBZ-RL

Overview

ADAU1381BCBZ-RL from Analog Devices is a low-noise 24-bit stereo audio codec with integrated 400 mW speaker amplifier, wind noise detection, dual-band ALC, and 6-band equalizer. It supports sampling rates from 8 kHz to 96 kHz, features pseudo-differential microphone inputs and optional PDM digital microphone interface, and targets battery-powered portable audio systems requiring high-fidelity recording and playback.

For engineers reviewing the ADAU1381BCBZ-RL datasheet, ADAU1381BCBZ-RL pinout, ADAU1381BCBZ-RL application, or ADAU1381BCBZ-RL equivalent, key selection considerations include its integrated sound engine for real-time audio processing, 32-lead 5 mm × 5 mm LFCSP package, I²C/SPI control, and configurable analog/digital I/O voltage range (1.8 V–3.3 V).

Technical Context

The ADAU1381BCBZ-RL integrates independent stereo ADC and DAC paths with programmable PGA gain (0–32 dB), digital attenuation (95 dB range, 0.375 dB step), and decimation/interpolation filters supporting 8–96 kHz sample rates. Its sound engine implements wind noise detection, enhanced stereo capture (ESC), and dual-band automatic level control - all configurable via SigmaStudio GUI.

It features dual analog microphone inputs (pseudo-differential or single-ended), optional stereo PDM digital microphone support, stereo line output, and Class-D speaker driver capable of 400 mW into 8 Ω. Clocking is managed by an internal PLL accepting 11–20 MHz master clocks and generating core clocks for all audio rates.

Key Specifications

Pinout & Package

ADAU1381BCBZ-RL is housed in a 32-lead, 5 mm × 5 mm LFCSP (Lead Frame Chip Scale Package) with exposed thermal pad. Pin functions are defined per Analog Devices Rev. B datasheet, including dedicated microphone bias (MICBIAS), speaker differential outputs (SPP/SPN), line outputs (AOUTL/AOUTR), and multi-function GPIOs (GPIO0–GPIO3).

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar stereo audio codec applications.

Compared with AK4642EN and TLV320AIC3106IRHBT, the ADAU1381BCBZ-RL uniquely combines autonomous wind noise mitigation, 400 mW speaker drive, and PDM microphone support - making it optimal for compact, self-contained audio capture systems where host processing resources are constrained.

Availability

ADAU1381BCBZ-RL is available at Aetrix Electronics and suitable for digital still cameras, digital video cameras, portable voice recorders, and smart audio accessories requiring stable component supply, long-term lifecycle support, and consistent parametric performance across production batches.

Supply support for ADAU1381BCBZ-RL includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The ADAU1381BCBZ-RL belongs to Analog Devices' SigmaDSP®-enabled audio codec family, designed specifically for portable consumer electronics demanding low-power, high-SNR audio capture and playback with embedded real-time processing.

FAQ

What is the maximum speaker output power of the ADAU1381BCBZ-RL?

The ADAU1381BCBZ-RL delivers up to 400 mW of continuous output power into an 8 Ω load at 3.3 V AVDD. This is achieved using its integrated Class-D speaker driver with differential outputs (SPP/SPN). Performance remains stable across temperature and supply variations, and the device includes thermal shutdown protection to prevent damage during sustained high-power operation. The ADAU1381BCBZ-RL datasheet specifies −60 dB THD+N at 330 mW and −16 dB at 440 mW into 8 Ω.

Does the ADAU1381BCBZ-RL support digital microphones?

Yes, the ADAU1381BCBZ-RL supports stereo pulse-density modulation (PDM) digital microphone inputs via dedicated MICD1 and MICD2 pins. These inputs accept standard 1-bit PDM streams with programmable clocking and data alignment, enabling direct connection to MEMS microphones without external decimation filters. The ADAU1381BCBZ-RL converts PDM data internally to PCM for processing in its sound engine, preserving signal integrity and reducing PCB layout complexity.

How does the wind noise detection feature work in the ADAU1381BCBZ-RL?

The ADAU1381BCBZ-RL implements a proprietary wind noise detection algorithm within its integrated sound engine that identifies low-frequency pressure fluctuations characteristic of wind interference. Upon detection, it automatically applies adaptive filtering - primarily targeting 20–200 Hz - while preserving speech content above 300 Hz. This function operates autonomously without host intervention and is configurable via SigmaStudio. The ADAU1381BCBZ-RL's wind noise mitigation is validated in real-world portable recording scenarios and contributes directly to its 99.2 dB ADC dynamic range specification.

What package type is used for the ADAU1381BCBZ-RL?

The ADAU1381BCBZ-RL uses a 32-lead, 5 mm × 5 mm LFCSP (Lead Frame Chip Scale Package) with an exposed thermal pad. This RoHS-compliant package provides excellent thermal performance and compact footprint ideal for space-constrained portable devices. Pin assignments match Analog Devices' Rev. B datasheet, and the exposed pad must be soldered to a thermal land on the PCB for optimal power dissipation and EMI reduction. The '-RL' suffix denotes tape-and-reel packaging for automated assembly.

Can the ADAU1381BCBZ-RL operate with different analog and digital supply voltages?

No - the ADAU1381BCBZ-RL requires AVDD1 and AVDD2 to be equal (1.81–3.65 V), and IOVDD must be independently set between 1.63–3.65 V to match host I/O voltage. While analog and digital supplies can differ (e.g., AVDD = 3.3 V, IOVDD = 1.8 V), the two analog rails AVDD1 and AVDD2 must track each other precisely. This constraint ensures proper biasing of the ADC, DAC, and speaker driver stages. The ADAU1381BCBZ-RL datasheet explicitly states "AVDD1 and AVDD2 must always be equal" in the Power Supply Specifications table.