WM8978GEFL/RV datasheet, PDF - EEWORLD Datasheet

Datasheet> All Categories > semiconductor> Other integrated circuit (IC)> WM8978GEFL/RV

WM8978GEFL/RV: Descriptionaudio codec str codec w/HP spkr 32-pin; Categorysemiconductor Other integrated circuit (IC); File Size2MB，117 Pages; ManufacturerAll Sensors; Environmental Compliance

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WM8978GEFL/RV Overview

audio codec str codec w/HP spkr 32-pin

WM8978GEFL/RV Parametric

Parameter Name	Attribute value
Maker	All Sensors
Product Category	audio codec
RoHS	yes
Maximum operating temperature	85 C
Installation style	SMD/SMT
Package/box	QFN-32
Encapsulation	Reel
Minimum operating temperature	- 25 C

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Stereo CODEC with Speaker Driver

DESCRIPTION

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.

WM8978

FEATURES

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 16Ω / 3.3V SPKVDD

•

1W output power into 8Ω BTL 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 analog 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

BLOCK DIAGRAM

APPLICATIONS

•

Stereo Camcorder or DSC

Multimedia Phone

WOLFSON MICROELECTRONICS plc

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http://www.wolfsonmicro.com/enews/

Production Data, June 2009, Rev 4.4

Wolfson Microelectronics plc

WM8978

TABLE OF CONTENTS

Production Data

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

DIGITAL FILTER CHARACTERISTICS ............................................................. 108

TERMINOLOGY ........................................................................................................ 108

DAC FILTER RESPONSES....................................................................................... 109

ADC FILTER RESPONSES....................................................................................... 109

HIGHPASS FILTER ................................................................................................... 110

PD Rev 4.4 June 2009

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