DataSheet26.com

WM8978 PDF даташит

Спецификация WM8978 изготовлена ​​​​«Wolfson Microelectronics plc» и имеет функцию, называемую «STEREO CODEC WITH SPEAKER DRIVER».

Детали детали

Номер произв WM8978
Описание STEREO CODEC WITH SPEAKER DRIVER
Производители Wolfson Microelectronics plc
логотип Wolfson Microelectronics plc логотип 

30 Pages
scroll

No Preview Available !

WM8978 Даташит, Описание, Даташиты
w
WM8978
Stereo CODEC with Speaker Driver
DESCRIPTION
FEATURES
The WM8978 is a low power, high quality stereo CODEC
designed for portable applications such as multimedia phone,
digital still camera or digital camcorder.
The device integrates preamps for stereo differential mics, and
includes drivers for speakers, headphone and differential or
stereo line output. External component requirements are
reduced as no separate microphone or headphone amplifiers
are required.
Advanced on-chip digital signal processing includes a 5-band
equaliser, a mixed signal Automatic Level Control for the
microphone or line input through the ADC as well as a purely
digital limiter function for record or playback. Additional digital
filtering options are available in the ADC path, to cater for
application filtering such as ‘wind noise reduction’.
The WM8978 digital audio interface can operate as a master or
a slave. An internal PLL can generate all required audio clocks
for the CODEC from common reference clock frequencies, such
as 12MHz and 13MHz.
The WM8978 operates at analogue supply voltages from 2.5V to
3.3V, although the digital core can operate at voltages down to
1.71V to save power. The speaker outputs and OUT3/4 line
outputs can run from a 5V supply if increased output power is
required. Individual sections of the chip can also be powered
down under software control.
Stereo CODEC:
DAC SNR 98dB, THD -84dB (‘A’ weighted @ 48kHz)
ADC SNR 95dB, THD -84dB (‘A’ weighted @ 48kHz)
On-chip Headphone Driver with ‘capless’ option
- 40mW per channel into 16/ 3.3V SPKVDD
1W output power into 8BTL speaker / 5V SPKVDD
- Capable of driving piezo speakers
- Stereo speaker drive configuration
Mic Preamps:
Stereo Differential or mono microphone Interfaces
- Programmable preamp gain
- Psuedo differential inputs with common mode
rejection
- Programmable ALC / Noise Gate in ADC path
Low-noise bias supplied for electret microphones
Other Features:
Enhanced 3-D function for improved stereo separation
Digital playback limiter
5-band Equaliser (record or playback)
Programmable ADC High Pass Filter (wind noise reduction)
Programmable ADC Notch Filter
Aux inputs for stereo analogue input signals or ‘beep’
On-chip PLL supporting 12, 13, 19.2MHz and other clocks
Support for 8, 11.025, 12, 16, 22.05, 24, 32, 44.1 and
48kHz sample rates
Low power, low voltage
- 2.5V to 3.6V (digital: 1.71V to 3.6V)
5x5mm 32-lead QFN package
APPLICATIONS
BLOCK DIAGRAM
Stereo Camcorder or DSC
Multimedia Phone
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews
Production Data, October 2011, Rev 4.5
Copyright 2011 Wolfson Microelectronics plc









No Preview Available !

WM8978 Даташит, Описание, Даташиты
WM8978
Production Data
TABLE OF CONTENTS
DESCRIPTION....................................................................................................... 1 
BLOCK DIAGRAM ................................................................................................ 1 
FEATURES ............................................................................................................ 1 
APPLICATIONS..................................................................................................... 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 ............................................................................................................ 10 
SPEAKER OUTPUT THD VERSUS POWER...................................................... 11 
POWER CONSUMPTION.................................................................................... 12 
AUDIO PATHS OVERVIEW ................................................................................ 14 
SIGNAL TIMING REQUIREMENTS .................................................................... 15 
SYSTEM CLOCK TIMING ............................................................................................. 15 
AUDIO INTERFACE TIMING – MASTER MODE.......................................................... 15 
AUDIO INTERFACE TIMING – SLAVE MODE ............................................................. 16 
CONTROL INTERFACE TIMING – 3-WIRE MODE ...................................................... 17 
CONTROL INTERFACE TIMING – 2-WIRE MODE ...................................................... 18 
INTERNAL POWER ON RESET CIRCUIT .......................................................... 19 
DEVICE DESCRIPTION ...................................................................................... 21 
INTRODUCTION ........................................................................................................... 21 
INPUT SIGNAL PATH ................................................................................................... 23 
ANALOGUE TO DIGITAL CONVERTER (ADC) ........................................................... 30 
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC)............................................ 36 
OUTPUT SIGNAL PATH ............................................................................................... 47 
3D STEREO ENHANCEMENT...................................................................................... 54 
ANALOGUE OUTPUTS................................................................................................. 54 
DIGITAL AUDIO INTERFACES..................................................................................... 70 
AUDIO SAMPLE RATES............................................................................................... 75 
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ................................................ 75 
LOOPBACK ................................................................................................................... 77 
COMPANDING .............................................................................................................. 77 
GENERAL PURPOSE INPUT/OUTPUT........................................................................ 79 
OUTPUT SWITCHING (JACK DETECT)....................................................................... 80 
CONTROL INTERFACE................................................................................................ 82 
RESETTING THE CHIP ................................................................................................ 83 
POWER SUPPLIES....................................................................................................... 83 
RECOMMENDED POWER UP/DOWN SEQUENCE.................................................... 83 
POWER MANAGEMENT .............................................................................................. 88 
REGISTER MAP .................................................................................................. 89 
REGISTER BITS BY ADDRESS ................................................................................... 91 
DIGITAL FILTER CHARACTERISTICS ............................................................ 108 
TERMINOLOGY .......................................................................................................... 108 
DAC FILTER RESPONSES ........................................................................................ 109 
ADC FILTER RESPONSES ........................................................................................ 109 
HIGHPASS FILTER..................................................................................................... 110 
w
PD, Rev 4.5, October 2011
2









No Preview Available !

WM8978 Даташит, Описание, Даташиты
Production Data
WM8978
5-BAND EQUALISER .................................................................................................. 111 
APPLICATION INFORMATION......................................................................... 115 
RECOMMENDED EXTERNAL COMPONENTS ......................................................... 115 
PACKAGE DIAGRAM ....................................................................................... 116 
IMPORTANT NOTICE ....................................................................................... 117 
ADDRESS ................................................................................................................... 117 
REVISION HISTORY ......................................................................................... 118 
w
PD, Rev 4.5, October 2011
3










Скачать PDF:

[ WM8978.PDF Даташит ]

Номер в каталогеОписаниеПроизводители
WM8971LSTEREO CODEC FOR PORTABLE AUDIO APPLLICATIONSWolfson Microelectronics plc
Wolfson Microelectronics plc
WM8972LMONO CODEC FOR PORTABLE AUDIO APPLICATIONSWolfson Microelectronics plc
Wolfson Microelectronics plc
WM8973STEREO CODEC FOR PORTABLE AUDIO APPLICATIONSWolfson Microelectronics plc
Wolfson Microelectronics plc
WM8973LStereo CODECWolfson Microelectronics
Wolfson Microelectronics

Номер в каталоге Описание Производители
TL431

100 мА, регулируемый прецизионный шунтирующий регулятор

Unisonic Technologies
Unisonic Technologies
IRF840

8 А, 500 В, N-канальный МОП-транзистор

Vishay
Vishay
LM317

Линейный стабилизатор напряжения, 1,5 А

STMicroelectronics
STMicroelectronics

DataSheet26.com    |    2020    |

  Контакты    |    Поиск