WM8711BL

w DESCRIPTION The WM8711BL is an ultra-small, low power stereo DAC with an integrated headphone driver. It is designed specifically for portable audio systems requiring hi-fi stereo playback through headphones. Stereo 24-bit multi-bit sigma delta DACs are used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported. Stereo audio outputs are buffered for driving headphones from a programmable volume control, line level outputs are also provided along with anti-thump mute and power up/down circuitry. The device is controlled via a 2 or 3 wire serial interface. The interface provides access to all features including volume controls, mutes, de-emphasis and extensive power management facilities. The device is available in an ultrasmall 24-lead QFN (4x4x0.9 mm Body) package. A USB clocking mode is provided where all audio rates can be derived from a single 12MHz or 24MHz MCLK, saving on the need for a PLL or multiple crystals. WM8711BL Ultra-Small Audio DAC with Headphone Amplifier FEATURES • • Audio Performance - DAC SNR 97dB (‘A’ weighted) at AVDD = 3.3V - DAC SNR 90dB (‘A’ weighted) at AVDD = 1.8V Low Power Headphone Playback - Down to 6mW at 1.8V - 1.42 – 3.6V Digital Supply Operation - 1.8 – 3.6 V Analogue Supply Operation DAC Sampling Frequency: 8kHz – 96kHz 2 or 3-Wire MPU Serial Control Interface Programmable Audio Data Interface Modes 2 - I S, Left, Right Justified or DSP - 16/20/24/32 bit Word Lengths - Master or Slave Clocking Mode Stereo Audio Outputs Output Volume and Mute Controls Highly Efficient Headphone Driver 24-lead QFN (4x4x0.9 mm) package • • • • • • • APPLICATIONS • • Multimedia Mobile Phones Portable MP3 / CD Players BLOCK DIAGRAM MODE SCLK SDIN CSB AGND AVDD VMID W WM8711B HPVDD CONTROL INTERFACE HPGND RLINEIN MUTE VOL/ MUTE H/P DRIVER RHPOUT DACDAT DACLRC DIGTAL AUDIO INTERFACE DAC +6 to -73dB 1 dB Steps ROUT DIGITAL FILTERS LOUT DAC +6 to -73dB 1 dB Steps VOL/ MUTE MUTE OSC CLKIN DIVIDER (Div x1, x2) CLKIN DIVIDER (Div x1, x2) BCLK H/P DRIVER LHPOUT LLINEIN DCVDD (1.5V) DBVDD (3.3V) XTI/MCLK WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/ CLKOUT DGND XTO Production Data, April 2007, Rev 4.1 Copyright ©2007 Wolfson Microelectronics plc WM8711BL Production Data TABLE OF CONTENTS DESCRIPTION .......................................................................................................1 FEATURES ............................................................................................................1 APPLICATIONS .....................................................................................................1 BLOCK DIAGRAM .................................................................................................1 PIN CONFIGURATION...........................................................................................3 ORDERING INFORMATION ..................................................................................3 PIN DESCRIPTION ................................................................................................4 ABSOLUTE MAXIMUM RATINGS.........................................................................5 RECOMMENDED OPERATING CONDITIONS .....................................................5 ELECTRICAL CHARACTERISTICS ......................................................................6 TERMINOLOGY .....................................................................................................7 POWER CONSUMPTION ......................................................................................8 HEADPHONE SNR VS AVDD ...............................................................................9 ANALOGUE SUPPLY CURRENT VS AVDD.........................................................9 DIGITAL AUDIO INTERFACE – MASTER MODE........................................................ 10 DIGITAL AUDIO INTERFACE – SLAVE MODE ........................................................... 11 MPU INTERFACE TIMING........................................................................................... 11 DEVICE DESCRIPTION .......................................................................................13 INTRODUCTION.......................................................................................................... 13 AUDIO SIGNAL PATH ................................................................................................. 14 DEVICE OPERATION.................................................................................................. 19 AUDIO DATA SAMPLING RATES ............................................................................... 27 ACTIVATING DSP AND DIGITAL AUDIO INTERFACE ............................................... 30 SOFTWARE CONTROL INTERFACE.......................................................................... 30 POWER DOWN MODES ............................................................................................. 32 REGISTER MAP .......................................................................................................... 34 DAC FILTER RESPONSES .................................................................................38 DIGITAL DE-EMPHASIS CHARACTERISTICS ..................................................40 RECOMMENDED EXTERNAL COMPONENTS ..................................................41 PACKAGE DIMENSIONS – QFN.........................................................................42 IMPORTANT NOTICE ..........................................................................................43 ADDRESS:................................................................................................................... 43 w PD, Rev 4.1, April 2007 2 Production Data WM8711BL PIN CONFIGURATION ORDERING INFORMATION DEVICE TEMPERATURE AVDD RANGE RANGE PACKAGE MOISTURE SENSITIVITY LEVEL PEAK SOLDERING TEMPERATURE WM8711BLGEFL/V -25 to 85oC 1.8 to 3.6V 24-lead QFN (Pb-free) 24-lead QFN (Pb-free, tape and reel) MSL3 260oC W M8711BLGEFL/RV Note: Reel quantity = 3500 -25 to 85oC 1.8 to 3.6V MSL3 260oC w PD, Rev 4.1, April 2007 3 WM8711BL PIN DESCRIPTION PIN 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 Note: 1. 2. Pull Up/Down only present when Control Register Interface ACTIVE=0 to conserve power. It is recommended that the QFN ground paddle is connected to analogue ground on the application PCB. NAME XTI/MCLK XTO DCVDD DGND DBVDD CLKOUT BCLK DACDAT DACLRC HPVDD LHPOUT RHPOUT HPGND LOUT ROUT AVDD AGND VMID RLINEIN LLINEIN MODE CSB SDIN SCLK TYPE Digital Input Digital Output Supply Ground Supply Digital Output Digital Input/Output Digital Input Digital Input/Output Supply Analogue Output Analogue Output Ground Analogue Output Analogue Output Supply Ground Analogue Output Analogue Input Analogue Input Digital Input Digital Input Digital Input/Output Digital Input Crystal Output Digital Core VDD Digital GND Digital Buffers VDD Buffered Clock Output Digital Audio Bit Clock, Pull Down (see Note 1) DAC Digital Audio Data Input DESCRIPTION Crystal Input or Master Clock Input (MCLK) Production Data DAC Sample Rate Left/Right Clock, Pull Down (see Note 1) Headphone VDD Left Channel Headphone Output Right Channel Headphone Output Headphone GND Left Channel Line Output Right Channel Line Output Analogue VDD Analogue GND Mid-rail reference decoupling point Right Channel Line Input (AC coupled) Left Channel Line Input (AC coupled) Control Interface Selection, Pull up (see Note 1) 3-Wire MPU Chip Select/ 2-Wire MPU interface address selection, active low, Pull up (see Note 1) 3-Wire MPU Data Input / 2-Wire MPU Data Input 3-Wire MPU Clock Input / 2-Wire MPU Clock Input w PD, Rev 4.1, April 2007 4 Production Data WM8711BL ABSOLUTE MAXIMUM RATINGS Absolute Maximum Ratings are stress ratings only. Permanent damage to the device may be caused by continuously operating at or beyond these limits. Device functional operating limits and guaranteed performance specifications are given under Electrical Characteristics at the test conditions specified. ESD Sensitive Device. This device is manufactured on a CMOS process. It is therefore generically susceptible to damage from excessive static voltages. Proper ESD precautions must be taken during handling and storage of this device. Wolfson tests its package types according to IPC/JEDEC J-STD-020B for Moisture Sensitivity to determine acceptable storage conditions prior to surface mount assembly. These levels are: MSL1 = unlimited floor life at 0.5465fs Table 24 Digital Filter Characteristics 0.5465fs -50 dB f > 0.584fs +/- 0.03dB -6dB 0.584fs -50 0 0.5fs +/- 0.03 dB 0.4535fs dB TEST CONDITIONS +/- 0.03dB -6dB MIN 0 0.5fs +/-0.03 dB TYP MAX 0.416fs UNIT DAC Filter Type 0 (USB mode, 250fs operation) DAC Filter Type 1 (USB mode, 272fs or Normal mode operation) w PD, Rev 4.1, April 2007 37 WM8711BL DAC FILTER RESPONSES 0.04 0 0.03 -20 0.02 Response (dB) Production Data Response (dB) 0.01 0 -0.01 -0.02 -40 -60 -80 -0.03 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.04 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 22 DAC Digital Filter Frequency Response–Type 0 Figure 23 DAC Digital Filter Ripple–Type 0 0.04 0 0.03 -20 0.02 Response (dB) Response (dB) 0.01 0 -0.01 -0.02 -40 -60 -80 -0.03 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.04 0 0.05 0.1 0.15 0.2 0.25 0.3 Frequency (Fs) 0.35 0.4 0.45 0.5 Figure 24 DAC Digital Filter Frequency Response–Type 1 Figure 25 DAC Digital Filter Ripple–Type 1 0.02 0 0.01 -20 0 Response (dB) Response (dB) -0.01 -0.02 -0.03 -0.04 -40 -60 -80 -0.05 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.06 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 26 DAC Digital Filter Frequency Response–Type 2 Figure 27 DAC Digital Filter Ripple–Type 2 w PD, Rev 4.1, April 2007 38 Production Data 0 WM8711BL 0.05 -20 0 Response (dB) -40 Response (dB) -0.05 -0.1 -60 -0.15 -80 -0.2 -100 0 0.5 1 1.5 Frequency (Fs) 2 2.5 3 -0.25 0 0.05 0.1 0.15 Frequency (Fs) 0.2 0.25 Figure 28 DAC Digital Filter Frequency Response–Type 3 Figure 29 DAC Digital Filter Ripple–Type 3 w PD, Rev 4.1, April 2007 39 WM8711BL DIGITAL DE-EMPHASIS CHARACTERISTICS 0 0.4 0.3 -2 0.2 Production Data Response (dB) -4 Response (dB) 0.1 0 -0.1 -0.2 -6 -8 -0.3 -10 0 2000 4000 6000 8000 10000 Frequency (Fs) 12000 14000 16000 -0.4 0 2000 4000 6000 8000 10000 Frequency (Fs) 12000 14000 16000 Figure 30 De-Emphasis Frequency Response (32kHz) Figure 31 De-Emphasis Error (32kHz) 0 0.4 0.3 -2 0.2 Response (dB) Response (dB) -4 0.1 0 -0.1 -0.2 -6 -8 -0.3 -10 0 5000 10000 Frequency (Fs) 15000 20000 -0.4 0 5000 10000 Frequency (Fs) 15000 20000 Figure 32 De-Emphasis Frequency Response (44.1kHz) Figure 33 De-Emphasis Error (44.1kHz) 0 0.4 0.3 -2 0.2 Response (dB) -4 Response (dB) 0.1 0 -0.1 -0.2 -6 -8 -0.3 -10 0 5000 10000 15000 Frequency (Fs) 20000 -0.4 0 5000 10000 15000 Frequency (Fs) 20000 Figure 34 De-Emphasis Frequency Response (48kHz) Figure 35 De-Emphasis Error (48kHz) w PD, Rev 4.1, April 2007 40 Production Data WM8711BL RECOMMENDED EXTERNAL COMPONENTS 3.3V 10µF + 0.1µ F 3.3V DBVDD AVDD 0.1µF + 10µF 3.3V DGND 10 µF 1.5V - 3.3V + 0.1µF AGND DCVDD 5.6k Ω + HPVDD 0.1µF + 10µF 220pF 5.6kΩ 1µF 1M Ω LLINEIN HPGND + 100 Ω 1µF 47k Ω VREF 5.6k Ω + LOUT RLINEIN + 220pF 5.6kΩ 1µF 1M Ω VREF WM8711BL DACLRC DACDAT BCLK ROUT 1µF 100 Ω 47kΩ DAC + Audio Serial Data I/F LHPOUT 220 µF 3-wire Interface 3.3V 10kΩ + 47kΩ 2-wire Interface DGND 3-wire or 2-wire MPU Interface MODE CSB SDIN SCLK RHPOUT 220µF 47k Ω CLKOUT VMID 100 Ω 0.1µF + 10 µF XTI/MCLK XTO *GND_PADDLE Cp Note X1 Cp 1. Where possible, it is recommended that NPO or COG type capacitors should be used for best performance. 2. *Ground Paddle in centre of QFN package back side. 3. X1 should have a CL of around 12pF and Cp should be around 15pF. Figure 36 External Components Diagram w PD, Rev 4.1, April 2007 41 WM8711BL PACKAGE DIMENSIONS – QFN Production Data w PD, Rev 4.1, April 2007 42 Production Data WM8711BL IMPORTANT NOTICE Wolfson Microelectronics plc (“Wolfson”) products and services are sold subject to Wolfson’s terms and conditions of sale, delivery and payment supplied at the time of order acknowledgement. Wolfson warrants performance of its products to the specifications in effect at the date of shipment. Wolfson reserves the right to make changes to its products and specifications or to discontinue any product or service without notice. Customers should therefore obtain the latest version of relevant information from Wolfson to verify that the information is current. Testing and other quality control techniques are utilised to the extent Wolfson deems necessary to support its warranty. Specific testing of all parameters of each device is not necessarily performed unless required by law or regulation. In order to minimise risks associated with customer applications, the customer must use adequate design and operating safeguards to minimise inherent or procedural hazards. Wolfson is not liable for applications assistance or customer product design. The customer is solely responsible for its selection and use of Wolfson products. Wolfson is not liable for such selection or use nor for use of any circuitry other than circuitry entirely embodied in a Wolfson product. Wolfson’s products are not intended for use in life support systems, appliances, nuclear systems or systems where malfunction can reasonably be expected to result in personal injury, death or severe property or environmental damage. Any use of products by the customer for such purposes is at the customer’s own risk. Wolfson does not grant any licence (express or implied) under any patent right, copyright, mask work right or other intellectual property right of Wolfson covering or relating to any combination, machine, or process in which its products or services might be or are used. Any provision or publication of any third party’s products or services does not constitute Wolfson’s approval, licence, warranty or endorsement thereof. Any third party trade marks contained in this document belong to the respective third party owner. Reproduction of information from Wolfson datasheets is permissible only if reproduction is without alteration and is accompanied by all associated copyright, proprietary and other notices (including this notice) and conditions. Wolfson is not liable for any unauthorised alteration of such information or for any reliance placed thereon. Any representations made, warranties given, and/or liabilities accepted by any person which differ from those contained in this datasheet or in Wolfson’s standard terms and conditions of sale, delivery and payment are made, given and/or accepted at that person’s own risk. Wolfson is not liable for any such representations, warranties or liabilities or for any reliance placed thereon by any person. ADDRESS: Wolfson Microelectronics plc Westfield House 26 Westfield Road Edinburgh EH11 2QB United Kingdom Tel :: +44 (0)131 272 7000 Fax :: +44 (0)131 272 7001 Email :: sales@wolfsonmicro.com w PD, Rev 4.1, April 2007 43