WM8952ECS/RV

w WM8952 Mono ADC with Microphone Pre-amplifier DESCRIPTION FEATURES The WM8952 is a low power, high quality mono ADC designed for portable applications such as wireless microphones or headsets. • • • • • The device integrates support for differential or single ended microphone connections. External component requirements are reduced as no separate microphone amplifier is required. An advanced Sigma Delta Converter design is used to give high quality audio at sample rates from 8 to 48ks/s. A selectable high pass filter and four fully-programmable notch filters are also available in the signal path. An advanced mixed signal ALC function with noise gate is provided, supporting readback of PGA gain during ALC operation. The digital audio interface supports A-law and μ-law companding. An on-chip PLL is provided to generate the required Master Clock from an external reference clock. The PLL clock can also be output if required elsewhere in the system. The WM8952 operates at supply voltages from 2.5 to 3.6V, although the digital supplies can operate at voltages down to 1.71V to save power. Different sections of the chip can also be powered down under software control using the selectable two or three wire control interface. The device is supplied in a very small W-CSP package, offering high levels of functionality in minimum board area, with high thermal performance. • • Mono ADC: Audio sample rates:8, 11.025, 16, 22.05, 24, 32, 44.1, 48kHz ADC SNR 94dB, THD -80dB (‘A’-weighted @ 8 – 48ks/s) Mic Preamps : Differential or single end Microphone Interface - Programmable preamp gain - Pseudo differential inputs with common mode rejection - Programmable ALC / Noise Gate in ADC path Low-noise bias supplied for electret microphones Multiple analog or ‘Aux’ inputs with analogue mixing OTHER FEATURES • Programmable high pass filter (wind noise reduction) • 4 notch filters (narrowband noise suppression) • On-chip PLL • Low power, low voltage - 2.5V to 3.6V (digital: 1.71V to 3.6V) • 28 ball W-CSP (2.59 × 2.5 × 0.7mm, 0.4mm pitch) Package APPLICATIONS • • • Headsets Wireless microphones General purpose mono audio ADC BLOCK DIAGRAM WOLFSON MICROELECTRONICS plc To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews Pre Production, Rev 3.1, June 2011 Copyright ©2011 Wolfson Microelectronics plc WM8952 Pre Production TABLE OF CONTENTS DESCRIPTION ................................................................................................................1 FEATURES......................................................................................................................1 APPLICATIONS ..............................................................................................................1 BLOCK DIAGRAM ..........................................................................................................1 TABLE OF CONTENTS ..................................................................................................2 PIN CONFIGURATION ....................................................................................................4 ORDERING INFORMATION ...........................................................................................4 PIN DESCRIPTION .........................................................................................................5 ABSOLUTE MAXIMUM RATINGS ..................................................................................6 RECOMMENDED OPERATING CONDITIONS ..............................................................6 ELECTRICAL CHARACTERISTICS ...............................................................................7 TERMINOLOGY ...................................................................................................................... 8 AUDIO PATHS OVERVIEW ............................................................................................9 POWER CONSUMPTION .............................................................................................10 SIGNAL TIMING REQUIREMENTS ..............................................................................11 SYSTEM CLOCK TIMING ..................................................................................................... 11 AUDIO INTERFACE TIMING – MASTER MODE .................................................................. 11 AUDIO INTERFACE TIMING – SLAVE MODE ...................................................................... 12 CONTROL INTERFACE TIMING – 3-WIRE MODE .............................................................. 13 CONTROL INTERFACE TIMING – 2-WIRE MODE .............................................................. 14 DEVICE DESCRIPTION ................................................................................................15 INTRODUCTION ................................................................................................................... 15 INPUT SIGNAL PATH ........................................................................................................... 16 ANALOGUE TO DIGITAL CONVERTER (ADC) .................................................................... 22 INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .................................................... 27 DIGITAL AUDIO INTERFACES ............................................................................................. 40 AUDIO SAMPLE RATES ....................................................................................................... 43 MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ......................................................... 44 COMPANDING ...................................................................................................................... 47 GENERAL PURPOSE INPUT/OUTPUT ................................................................................ 49 CONTROL INTERFACE ........................................................................................................ 49 3-WIRE SERIAL CONTROL MODE ...................................................................................... 51 READBACK IN 3-WIRE MODE ............................................................................................. 51 2-WIRE SERIAL CONTROL MODE ...................................................................................... 52 RESETTING THE CHIP ........................................................................................................ 52 POWER SUPPLIES .............................................................................................................. 52 POWER MANAGEMENT ...................................................................................................... 54 POP MINIMISATION ............................................................................................................. 55 THERMAL SHUTDOWN ....................................................................................................... 55 REGISTER MAP............................................................................................................56 REGISTER BITS BY ADDRESS ........................................................................................... 57 DIGITAL FILTER CHARACTERISTICS ........................................................................65 TERMINOLOGY .................................................................................................................... 65 ADC FILTER RESPONSES................................................................................................... 65 HIGHPASS FILTER ............................................................................................................... 66 NOTCH FILTERS AND LOW PASS FILTER ......................................................................... 67 RECOMMENDED EXTERNAL COMPONENTS ...........................................................69 PACKAGE DIAGRAM ...................................................................................................70 IMPORTANT NOTICE ...................................................................................................71 w PP, Rev 3.1, June 2011 2 Pre Production WM8952 ADDRESS ............................................................................................................................. 71 REVISION HISTORY .....................................................................................................72 w PP, Rev 3.1, June 2011 3 WM8952 Pre Production PIN CONFIGURATION ORDERING INFORMATION ORDER CODE WM8952ECS/RV TEMPERATURE RANGE -25°C to +85°C PACKAGE 28-ball W-CSP (Pb-free, tape and reel) MOISTURE SENSITIVITY LEVEL MSL3 PACKAGE BODY TEMPERATURE 260oC Note: Reel quantity: WM8952ECS/RV = 3,500 w PP, Rev 3.1, June 2011 4 WM8952 Pre Production PIN DESCRIPTION PIN (WLCSP) NAME TYPE DESCRIPTION B5 MICBIAS Analogue Output Microphone bias B6 AVDD Supply Analogue supply C6 AGND Supply Analogue ground D6 DCVDD Supply Digital Supply (Core) D5 DBVDD Supply Digital supply (Input/Output) E6 DGND Supply Digital ground Digital Output ADC digital audio data output F6 ADCDAT E5 TP E3 Test pin Connect to ground FRAME Digital Input / Output ADC sample rate clock or frame synch F5 BCLK Digital Input / Output Digital audio port clock F4 MCLK Digital Input Master clock input F3 CSB/GPIO E2 Digital Input / Output 3-Wire control interface chip select or GPIO pin SCLK Digital Input Control interface clock input F1 SDIN Digital Input / Output Control interface data input F2 MODE/GPIO A1 Digital Input Control interface mode selection or GPIO pin AGND2 Supply Analogue ground A2 AVDD2 Supply Analogue supply B4 AUX Analogue Input Auxiliary analogue input A4 VMID Reference Decoupling for midrail reference voltage A5 MICN Analogue Input Microphone negative input (common mode) A6 MICP Analogue Input Microphone positive input A3, B1, B2, C1, C2, D1, E1 DNC Do Not Connect Leave these pins floating w PP, Rev 3.1, June 2011 5 WM8952 ABSOLUTE MAXIMUM RATINGS Pre Production 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