Low Noise Stereo Codec with Enhanced Recording and Playback Processing ADAU1381 FEATURES GENERAL DESCRIPTION 24-bit stereo audio ADC and DAC The ADAU1381 is a low power, 24-bit stereo audio codec. The 400 mW speaker amplifier (into 8 load) low noise DAC and ADC support sample rates from 8 kHz to Built-in sound engine for audio processing 96 kHz. Low current draw and power saving modes make the Wind noise detection and autofiltering ADAU1381 ideal for battery-powered audio applications. Enhanced stereo capture (ESC) Dual-band automatic level control (ALC) A configurable sound engine provides enhanced record and 6-band equalizer, including notch filter playback processing to improve overall audio quality. Sampling rates from 8 kHz to 96 kHz The record path includes two digital stereo microphone inputs Stereo pseudo differential microphone input and an analog stereo input path. The analog inputs can be Optional stereo digital microphone input pulse-density configured for either a pseudo differential or a single-ended modulation (PDM) stereo source. A dedicated analog beep input signal can be Stereo line output mixed into any output path. The ADAU1381 includes a stereo PLL supporting a range of input clock rates line output and speaker driver, which makes the device capable of Analog and digital I/O 1.8 V to 3.3 V supporting dynamic speakers. Software control via SigmaStudio graphical user interface Software-controllable, clickless mute 2 The serial control bus supports the I C or SPI protocols, and Software register and hardware pin standby mode 2 the serial audio bus is programmable for I S, left-justified, right- 32-lead, 5 mm 5 mm LFCSP or 30-ball, 6 5 bump WLCSP justified, or TDM mode. A programmable PLL supports flexible clock generation for all standard rates and available master clocks APPLICATIONS from 11 MHz to 20 MHz. Digital still cameras Digital video cameras FUNCTIONAL BLOCK DIAGRAM ADAU1381 REGULATOR BEEP PGA SOUND ENGINE LMIC/LMICN/ AOUTL DECIMATION MICD1 FILTERS AOUTR LEFT LEFT PGA ADC DAC WIND NOISE LMICP OUTPUT MIXER NOTCH FILTER RMIC/RMICN/ EQUALIZER MICD2 SPP DIGITAL VOLUME RIGHT RIGHT CONTROL PGA ADC DAC SPN RMICP AUTOMATIC LEVEL CONTROL PDN 2 MICROPHONE SERIAL DATA I C/SPI MICBIAS PLL BIAS INPUT/OUTPUT PORTS CONTROL PORT Figure 1. Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. rights of third parties that may result from its use. Specifications subject to change without notice. No Tel: 781.329.4700 www.analog.com license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Fax: 781.461.3113 20092011 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. CM MCKI IOVDD DGND ADC SDATA/ GPIO1 DVDDOUT AVDD1 BCLK/GPIO2 AGND1 LRCLK/GPIO3 AVDD2 AGND2 DAC SDATA/ GPIO0 ADDR0/CDATA ADDR1/CLATCH SCL/CCLK SDA/COUT 08313-001ADAU1381 TABLE OF CONTENTS Features .............................................................................................. 1 Input Signal Path ........................................................................ 30 Applications....................................................................................... 1 Analog-to-Digital Converters................................................... 31 General Description ......................................................................... 1 Digital Dual-Band Automatic Level Control (ALC) ............. 31 Functional Block Diagram .............................................................. 1 Playback Signal Path ...................................................................... 32 Revision History ............................................................................... 3 Output Signal Paths ................................................................... 32 Specifications..................................................................................... 4 Digital-to-Analog Converters................................................... 32 Record Side Performance Specifications................................... 4 Line Outputs ............................................................................... 32 Output Side Performance Specifications................................... 6 Speaker Output........................................................................... 32 Power Supply Specifications........................................................ 8 Control Ports................................................................................... 33 2 Typical Power Management Measurements ............................. 9 I C Port ........................................................................................ 33 Digital Filters................................................................................. 9 SPI Port........................................................................................ 36 Digital Input/Output Specifications......................................... 10 Memory and Register Access.................................................... 36 Digital Timing Specifications ................................................... 11 Serial Data Input/Output Ports .................................................... 38 Absolute Maximum Ratings.......................................................... 14 TDM Modes................................................................................ 38 Thermal Resistance .................................................................... 14 General-Purpose Input/Outputs .................................................. 40 ESD Caution................................................................................ 14 Sound Engine.................................................................................. 41 Pin Configuration and Function Descriptions........................... 15 Signal Processing........................................................................ 41 Typical Performance Characteristics ........................................... 17 Processing Flow .......................................................................... 41 System Block Diagrams ................................................................. 20 Programming.............................................................................. 41 Theory of Operation ...................................................................... 24 Parameter Memory .................................................................... 41 Startup, Initialization, and Power................................................. 25 Applications Information .............................................................. 42 Power-Up Sequence ................................................................... 25 Power Supply Bypass Capacitors.............................................. 42 Clock Generation and Management........................................ 26 GSM Noise Filter ........................................................................ 42 Enabling Digital Power to Functional Subsystems ................ 26 Grounding ................................................................................... 42 Setting Up the Sound Engine.................................................... 26 Speaker Driver Supply Trace (AVDD2) .................................. 42 Power Reduction Modes............................................................ 26 Exposed Pad PCB Design ......................................................... 42 Power-Down Sequence.............................................................. 26 Control Register Map..................................................................... 43 Clocking and Sampling Rates ....................................................... 27 Clock Management, Internal Regulator, and PLL Control... 44 Core Clock................................................................................... 27 Record Path Configuration....................................................... 48 Sampling Rates............................................................................ 27 Serial Port Configuration.......................................................... 53 PLL ............................................................................................... 28 Audio Converter Configuration............................................... 58 Record Signal Path.......................................................................... 30 Playback Path Configuration.................................................... 63 Rev. B Page 2 of 84