Stereo CODEC. WM8988 Datasheet

WM8988 CODEC. Datasheet pdf. Equivalent

Part WM8988
Description Stereo CODEC
Feature WM8988 Stereo CODEC for Portable Audio Applications DESCRIPTION The WM8988 is a low power, high qu.
Manufacture Cirrus Logic
Datasheet
Download WM8988 Datasheet



WM8988
WM8988
Stereo CODEC for Portable Audio Applications
DESCRIPTION
The WM8988 is a low power, high quality stereo CODEC
designed for portable digital audio applications.
The device integrates complete interfaces to 2 stereo
headphone or line out ports. External component
requirements are drastically reduced as no separate
headphone amplifiers are required. Advanced on-chip digital
signal processing performs graphic equaliser, 3-D sound
enhancement and automatic level control for the
microphone or line input.
The WM8988 can operate as a master or a slave, with
various master clock frequencies including 12 or 24MHz for
USB devices, or standard 256fs rates like 12.288MHz and
24.576MHz. Different audio sample rates such as 96kHz,
48kHz, 44.1kHz are generated directly from the master
clock without the need for an external PLL.
The WM8988 operates at supply voltages down to 1.8V,
although the digital core can operate at voltages down to
1.42V to save power, and the maximum for all supplies is
3.6 Volts. Different sections of the chip can also be powered
down under software control.
The WM8988 is supplied in a very small and thin 4x4mm
COL package, ideal for use in hand-held and portable
systems.
BLOCK DIAGRAM
FEATURES
DAC SNR 100dB (‘A’ weighted), THD –90dB at 48kHz, 3.3V
ADC SNR 93dB (‘A’ weighted), THD -81dB at 48kHz, 3.3V
Programmable ALC / Noise Gate
2x On-chip Headphone Drivers
- >40mW output power on 16/ 3.3V
- THD 80dB at 20mW, SNR 90dB with 16load
Digital Graphic Equaliser
Low Power
- 7mW stereo playback (1.8V / 1.5V supplies)
- 14mW record and playback (1.8V / 1.5V supplies)
Low Supply Voltages
- Analogue 1.8V to 3.6V
- Digital core: 1.42V to 3.6V
- Digital I/O: 1.8V to 3.6V
256fs / 384fs or USB master clock rates: 12MHz, 24MHz
Audio sample rates: 8, 11.025, 16, 22.05, 24, 32, 44.1, 48,
88.2, 96kHz generated internally from master clock
4x4mm COL package
APPLICATIONS
Portable Multimedia players
Multimedia handsets
Handheld gaming
DGND
DCVDD
DBVDD
HPGND HPVDD
LINPUT1
LINPUT2
RINPUT2
RINPUT1
DIFF.
INPUT
L1-R1 OR
L2-R2
M LMIXSEL
U
X
DC MEASUREMENT
M PGA
U + MIC
X BOOST
LINSEL
ANALOGUE
MONO MIX
RINSEL
M PGA
U + MIC
X BOOST
DC MEASUREMENT
M
U
X RMIXSEL
50K 50K
WM8988
ADC
ADC
DIGITAL
FILTERS
VOLUME
DIGITAL
MONO MIX
DIGITAL
FILTERS
GRAPHIC
EQUALISER
BASS
BOOST
DAC
DAC
LEFT
LD2LO MIXER
LI2LO
RD2LO
RI2LO
RIGHT
LD2RO MIXER
LI2RO
RD2RO
RI2RO
AUDIO
INTERFACE
CLOCK
CIRCUITRY
CONTROL
INTERFACE
LOUT1
(headphone / line output
LOUT1VOL
HPCOM
ROUT1
ROUT1VOL (headphone / line output
LOUT2
LOUT2VOL (headphone / line output
LCOM
ROUT2
(headphone / line output
ROUT2VOL
http://www.cirrus.com
Copyright Cirrus Logic, Inc., 20082016
(All Rights Reserved)
Rev 4.2
DEC ‘16



WM8988
WM8988
TABLE OF CONTENTS
DESCRIPTION................................................................................................................ 1
FEATURES ..................................................................................................................... 1
APPLICATIONS.............................................................................................................. 1
BLOCK DIAGRAM ......................................................................................................... 1
TABLE OF CONTENTS.................................................................................................. 2
PIN CONFIGURATION ................................................................................................... 3
ORDERING INFORMATION........................................................................................... 3
PIN DESCRIPTION......................................................................................................... 4
ABSOLUTE MAXIMUM RATINGS ................................................................................. 5
RECOMMENDED OPERATING CONDITIONS.............................................................. 5
ELECTRICAL CHARACTERISTICS .............................................................................. 6
POWER CONSUMPTION............................................................................................. 10
SIGNAL TIMING REQUIREMENTS ............................................................................. 11
SYSTEM CLOCK TIMING........................................................................................................11
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
DEVICE DESCRIPTION ............................................................................................... 17
INTRODUCTION ......................................................................................................................17
INPUT SIGNAL PATH ..............................................................................................................17
AUTOMATIC LEVEL CONTROL (ALC) ...................................................................................23
OUTPUT SIGNAL PATH ..........................................................................................................27
ANALOGUE OUTPUTS ...........................................................................................................32
ENABLING THE OUTPUTS .....................................................................................................34
THERMAL SHUTDOWN ..........................................................................................................34
DIGITAL AUDIO INTERFACE..................................................................................................35
AUDIO INTERFACE CONTROL ..............................................................................................38
CLOCKING AND SAMPLE RATES..........................................................................................40
CONTROL INTERFACE...........................................................................................................42
POWER SUPPLIES .................................................................................................................44
POWER MANAGEMENT .........................................................................................................44
REGISTER MAP ........................................................................................................... 47
DIGITAL FILTER CHARACTERISTICS ....................................................................... 48
TERMINOLOGY .......................................................................................................................48
DAC FILTER RESPONSES .....................................................................................................49
ADC FILTER RESPONSES .....................................................................................................50
DE-EMPHASIS FILTER RESPONSES ....................................................................................51
HIGHPASS FILTER .................................................................................................................52
APPLICATIONS INFORMATION ................................................................................. 53
RECOMMENDED EXTERNAL COMPONENTS ......................................................................53
LINE INPUT CONFIGURATION...............................................................................................54
HEADPHONE OUTPUT CONFIGURATION............................................................................54
LINE OUTPUT CONFIGURATION...........................................................................................54
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS....................................................55
POWER MANAGEMENT EXAMPLES.....................................................................................55
2 Rev 4.2





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