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Wolfson Microelectronics
Wolfson Microelectronics

WM8976 Datasheet

Low Power CODEC With Speaker Driver


WM8976 Datasheet Preview


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WM8976
Low Power CODEC With Speaker Driver
DESCRIPTION
FEATURES
The WM8976 is a low power, high quality codec designed for
portable applications such as Digital still camera or Digital
Camcorder.
The device integrates a preamp for a differential mic, 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 WM8976 CODEC 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 WM8976 operates at analogue supply voltages from 2.5V
to 3.6V, although the digital core can operate at voltages down
to 1.8V 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 90dB, THD -80dB (‘A’ weighted @ 48kHz)
On-chip Headphone Driver with ‘capless’ option
- 40mW output power into 16/ 3.3V SPKVDD
0.9W output power into 8BTL speaker / 5V SPKVDD
- Capable of driving piezo speakers
- Stereo speaker drive configuration
Mic Preamps:
Differential or single-ended microphone Interface
- Programmable preamp gain
- Psuedo differential input 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
Low power, low voltage
- 2.5V to 3.6V (digital core: 1.8V to 3.6V)
- power consumption <30mW all-on with 2.5V supplies
5x5mm 32-pin QFN package
APPLICATIONS
Stereo Camcorder or DSC
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Preliminary Technical Data, February 2005, Rev 2.0
Copyright 2005 Wolfson Microelectronics plc.
Page 1

WM8976
Preliminary Technical Data
TABLE OF CONTENTS
DESCRIPTION .......................................................................................................1
FEATURES.............................................................................................................1
APPLICATIONS .....................................................................................................1
PIN CONFIGURATION...........................................................................................3
ORDERING INFORMATION ..................................................................................3
PIN DESCRIPTION ................................................................................................4
ABSOLUTE MAXIMUM RATINGS.........................................................................5
RECOMMENDED OPERATING CONDITIONS .....................................................5
ELECTRICAL CHARACTERISTICS ......................................................................6
TERMINOLOGY ............................................................................................................ 8
SPEAKER OUTPUT THD VERSUS POWER ......................................................10
POWER CONSUMPTION ....................................................................................11
SIGNAL TIMING REQUIREMENTS .....................................................................12
SYSTEM CLOCK TIMING ........................................................................................... 12
AUDIO INTERFACE TIMING – MASTER MODE ........................................................ 12
AUDIO INTERFACE TIMING – SLAVE MODE............................................................ 13
CONTROL INTERFACE TIMING – 3-WIRE MODE .................................................... 14
CONTROL INTERFACE TIMING – 2-WIRE MODE .................................................... 15
INTERNAL POWER ON RESET CIRCUIT ..........................................................16
RECOMMENDED POWER UP/DOWN SEQUENCE .................................................. 18
DEVICE DESCRIPTION.......................................................................................22
INTRODUCTION ......................................................................................................... 22
INPUT SIGNAL PATH ................................................................................................. 24
ANALOGUE TO DIGITAL CONVERTER (ADC).......................................................... 29
INPUT LIMITER / AUTOMATIC LEVEL CONTROL (ALC) .......................................... 32
OUTPUT SIGNAL PATH ............................................................................................. 36
3D STEREO ENHANCEMENT .................................................................................... 42
ANALOGUE OUTPUTS............................................................................................... 43
DIGITAL AUDIO INTERFACES................................................................................... 56
AUDIO SAMPLE RATES ............................................................................................. 63
MASTER CLOCK AND PHASE LOCKED LOOP (PLL) ............................................... 63
GENERAL PURPOSE INPUT/OUTPUT...................................................................... 65
OUTPUT SWITCHING (JACK DETECT)..................................................................... 66
CONTROL INTERFACE.............................................................................................. 68
RESETTING THE CHIP .............................................................................................. 69
POWER SUPPLIES .................................................................................................... 69
POWER MANAGEMENT ............................................................................................ 70
REGISTER MAP...................................................................................................72
DIGITAL FILTER CHARACTERISTICS ...............................................................74
TERMINOLOGY .......................................................................................................... 74
DAC FILTER RESPONSES......................................................................................... 75
ADC FILTER RESPONSES......................................................................................... 75
HIGHPASS FILTER..................................................................................................... 76
5-BAND EQUALISER .................................................................................................. 77
APPLICATIONS INFORMATION .........................................................................81
RECOMMENDED EXTERNAL COMPONENTS .......................................................... 81
IMPORTANT NOTICE ..........................................................................................83
ADDRESS: .................................................................................................................. 83
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PTD Rev 2.0 February 2005
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Page 2

Preliminary Technical Data
PIN CONFIGURATION
WM8976
ORDERING INFORMATION
ORDER CODE
WM8976GEFL/V
TEMPERATURE
RANGE
-25°C to +85°C
WM8976GEFL/RV
-25°C to +85°C
Note:
Reel quantity = 3,500
PACKAGE
32-pin QFN (5 x 5 mm)
(lead free)
32-pin QFN (5 x 5 mm)
(lead free, tape and reel)
MOISTURE
SENSITIVITY LEVEL
MSL3
MSL3
PEAK SOLDERING
TEMPERATURE
260oC
260oC
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PTD Rev 2.0 February 2005
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WM8976
Preliminary Technical Data
PIN DESCRIPTION
PIN NAME
1 LIP
2 LIN
3 L2/GPIO2
4 DNC
5 DNC
6 DNC
7 LRC
8 BCLK
9 ADCDAT
10 DACDAT
11 MCLK
12 DGND
13 DCVDD
14 DBVDD
15 CSB/GPIO1
16 SCLK
17 SDIN
18 MODE
19 AUXL
20 AUXR
21 OUT4
22 OUT3
23 ROUT2
24 SPKGND
25 LOUT2
26 SPKVDD
27 VMID
28 AGND
29 ROUT1
30 LOUT1
31 AVDD
32 MICBIAS
TYPE
Analogue input
Analogue input
Analogue input
Do not connect
Do not connect
Do not connect
Digital Input / Output
Digital Input / Output
Digital Output
Digital Input
Digital Input
Supply
Supply
Supply
Digital Input / Output
Digital Input
Digital Input / Output
Digital Input
Analogue input
Analogue input
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Output
Supply
Reference
Supply
Analogue Output
Analogue Output
Supply
Analogue Output
DESCRIPTION
Left Mic Pre-amp positive input
Left Mic Pre-amp negative input
Left channel line input/secondary mic pre-amp positive input/GPIO pin
Leave this pin floating
Leave this pin floating
Leave this pin floating
DAC and ADC Sample Rate Clock
Digital Audio Port Clock
ADC Digital Audio Data Output
DAC Digital Audio Data Input
Master Clock Input
Digital ground
Digital core logic supply
Digital buffer (I/O) supply
3-Wire MPU Chip Select / General purpose input/output 1
3-Wire MPU Clock Input / 2-Wire MPU Clock Input
3-Wire MPU Data Input / 2-Wire MPU Data Input/Acknowledge
Control Interface Selection
Left Auxillary input
Right Auxillary input
Buffered midrail Headphone pseudo-ground, or Right line output or MONO
mix output
Buffered midrail Headphone pseudo-ground, or Left line output
Second right output, or BTL speaker driver positive output
Speaker ground (feeds speaker amp and OUT3/OUT4)
Second left output, or BTL speaker driver negative output
Speaker supply (feed speaker amp only)
Decoupling for ADC and DAC reference voltage
Analogue ground (feeds ADC and DAC)
Headphone Output Right
Headphone Output Left
Analogue supply (feeds ADC and DAC)
Microphone Bias
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PTD Rev 2.0 February 2005
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Page 4
Part Number WM8976
Manufactur Wolfson Microelectronics
Description Low Power CODEC With Speaker Driver
Total Page 30 Pages
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