WM8750L
Stereo CODEC for Portable Audio Applications
DESCRIPTION
The WM8750L is a low power, high quality stereo codec
designed for portable digital audio applications.
The device integrates complete interfaces to stereo or mono
microphones and a stereo headphone. External component
requirements are drastically reduced as no separate
microphone or 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 WM8750L can operate as a master or a slave, with
various master clock frequencies including 12 or 24MHz for
USB devices, or standard 256f
s
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 WM8750L 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 WM8750L is supplied in a very small and thin 5x5mm
QFN package, ideal for use in hand-held and portable
systems.
FEATURES
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DAC SNR 98dB (‘A’ weighted), THD -95B at 48kHz, 3.3V
ADC SNR 95dB (‘A’ weighted), THD -90dB at 48kHz, 3.3V
Complete Stereo / Mono Microphone Interface
- Programmable ALC / Noise Gate
On-chip 400mW BTL Speaker Driver (mono)
On-chip Headphone Driver
- >40mW output power on 16Ω / 3.3V
- THD –80dB at 20mW, SNR 90dB with 16Ω load
- No DC blocking capacitors required (capless mode)
Separately mixed mono output
Digital Graphic Equaliser
Low Power
- 7mW stereo playback (1.8V / 1.5V supplies)
- 14mW record & 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
5x5x0.9mm QFN package
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APPLICATIONS
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•
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MP3 Player / Recorder
AAC/WMA/Multi-Format Player / Recorder
Minidisc Player / Recorder
Portable Digital Music Systems
BLOCK DIAGRAM
DGND
M
U
X
LMIXSEL
DC MEASUREMENT
LINPUT1
LINPUT2
LINPUT3
M
U
X
LINSEL
DIFF.
INPUT
L1-R1 OR
L2-R2
RINSEL
PGA
+ MIC
BOOST
ADC
DIGITAL
FILTERS
Å
WM8750L
AUDIO
INTERFACE
BCLK
ADCLRC
ADCDAT
DACLRC
DACDAT
DCVDD
DBVDD
HPGND
HPVDD
OUT3SW
VREF
ROUT1
LEFT
LD2LO MIXER
MONOOUT
LI2LO
M
U
X
-1
OUT3
LOUT1
RD2LO
DAC
MONO
LD2MO MIXER
RI2LO
LI2MO
LOUT1VOL
DIGITAL
FILTERS
GRAPHIC
EQUALISER
BASS
BOOST
VOLUME
ANALOGUE
MONO MIX
DIGITAL
MONO MIX
MONOOUT
(phone TX)
RD2MO
RI2MO
LI2RO
MONOVOL
RINPUT3/
HPDETECT
RINPUT2
RINPUT1
M
U
X
PGA
+ MIC
BOOST
ADC
3D
ENHANCE
DAC
RIGHT
LD2RO MIXER
ROUT1
RD2RO
RI2RO
ROUT1VOL
DC MEASUREMENT
M
U
X
RMIXSEL
LOUT2VOL
LOUT2
L - (-R)
= L+R
ROUT2
ROUT2VOL
MICBIAS
50K
50K
-1
CLOCK
CIRCUITRY
CONTROL
INTERFACE
ROUT2
INV
AGND
VREF
MODE
SCLK
SDIN
CSB
MCLK
AVDD
VMID
WOLFSON MICROELECTRONICS plc
www.wolfsonmicro.com
Product Preview, May 2003, Rev 1.77
Copyright
2003
Wolfson Microelectronics plc
WM8750L
TABLE OF CONTENTS
Product Preview
DESCRIPTION ......................................................................................................1
FEATURES ...........................................................................................................1
APPLICATIONS ....................................................................................................1
BLOCK DIAGRAM................................................................................................1
PIN CONFIGURATION .........................................................................................4
ORDERING INFORMATION .................................................................................4
PIN DESCRIPTION ...............................................................................................4
ABSOLUTE MAXIMUM RATINGS........................................................................5
RECOMMENDED OPERATION CONDITIONS ....................................................5
ELECTRICAL CHARACTERISTICS .....................................................................6
HEADPHONE / SPEAKER OUTPUT THD VERSUS POWER......................................8
POWER CONSUMPTION ...................................................................................11
SIGNAL TIMING REQUIREMENTS....................................................................12
SYSTEM CLOCK TIMING ..........................................................................................12
AUDIO INTERFACE TIMING – MASTER MODE........................................................12
AUDIO INTERFACE TIMING – SLAVE MODE ...........................................................13
DEVICE DESCRIPTION......................................................................................16
INTRODUCTION ........................................................................................................16
INPUT SIGNAL PATH ................................................................................................16
AUTOMATIC LEVEL CONTROL (ALC) ......................................................................22
3D STEREO ENHANCEMENT ...................................................................................25
OUTPUT SIGNAL PATH.............................................................................................26
ANALOGUE OUTPUTS ..............................................................................................31
ENABLING THE OUTPUTS........................................................................................33
HEADPHONE SWITCH ..............................................................................................33
THERMAL SHUTDOWN.............................................................................................35
HEADPHONE OUTPUT..............................................................................................35
DIGITAL AUDIO INTERFACE ....................................................................................36
PP Rev 1.77 May 2003
2
Product Preview
WM8750L
AUDIO INTERFACE CONTROL .................................................................................39
MASTER CLOCK AND AUDIO SAMPLE RATES .......................................................40
CONTROL INTERFACE .............................................................................................42
POWER SUPPLIES....................................................................................................43
POWER MANAGEMENT............................................................................................44
REGISTER MAP .................................................................................................46
DIGITAL FILTER CHARACTERISTICS..............................................................47
TERMINOLOGY .........................................................................................................47
DAC FILTER RESPONSES ................................................................................48
ADC FILTER RESPONSES ................................................................................49
DE-EMPHASIS FILTER RESPONSES ...............................................................50
HIGHPASS FILTER ............................................................................................51
APPLICATIONS INFORMATION ........................................................................52
RECOMMENDED EXTERNAL COMPONENTS .........................................................52
LINE INPUT CONFIGURATION .................................................................................53
MICROPHONE INPUT CONFIGURATION .................................................................53
MINIMISING POP NOISE AT THE ANALOGUE OUTPUTS .......................................54
POWER MANAGEMENT EXAMPLES........................................................................54
PACKAGE DIMENSIONS ...................................................................................55
IMPORTANT NOTICE........................................................................................ 54
ADDRESS: .................................................................................................................56
PP Rev 1.77 May 2003
3
WM8750L
PIN CONFIGURATION
RINPUT3 /
HPDETECT
Product Preview
ORDERING INFORMATION
ORDER CODE
WM8750LEFL
16
15
14
13
12
11
10
9
LINPUT3
MICBIAS
HPVDD
AGND
AVDD
VREF
VMID
TEMPERATURE
RANGE
-25°C to +85°C
PACKAGE
32-pin QFN
(5x5x0.9mm)
32-pin QFN
(5x5x0.9mm)
(lead free)
32-pin QFN
(5x5x0.9mm)
(tape and reel)
32-pin QFN
(5x5x0.9mm)
(lead free, tape and
reel)
24
23
22
21
20
19
18
17
RINPUT2
25
LINPUT2
26
RINPUT1
27
LINPUT1
28
LOUT2
ROUT2
HPGND
LOUT1
ROUT1
OUT3
MONOOUT
ADCLRC
WM8750LSEFL
-25°C to +85°C
MODE
29
CSB
30
SDIN
31
SCLK
32
1
2
3
4
5
6
7
8
WM8750LEFL/R
-25°C to +85°C
WM8750LSEFL/R
-25°C to +85°C
DACDAT
DACLRC
ADCDAT
DCVDD
DBVDD
DGND
MCLK
BCLK
Note:
Reel quantity = 3500
PIN DESCRIPTION
PIN #
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
NAME
MCLK
DCVDD
DBVDD
DGND
BCLK
DACDAT
DACLRC
ADCDAT
ADCLRC
MONOOUT
OUT3
ROUT1
LOUT1
HPGND
ROUT2
LOUT2
HPVDD
AVDD
AGND
VREF
VMID
MICBIAS
RINPUT3 /
HPDETECT
LINPUT3
RINPUT2
LINPUT2
RINPUT1
LINPUT1
MODE
CSB
SDIN
SCLK
Supply
Supply
Supply
Digital Input / Output
Digital Input
Digital Input / Output
Digital Output
Digital Input / Output
Analogue Output
Analogue Output
Analogue Output
Analogue Output
Supply
Analogue Output
Analogue Output
Supply
Supply
Supply
Analogue Output
Analogue Output
Analogue Output
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Analogue Input
Digital Input
Digital Input
Digital Input/Output
Digital Input
TYPE
Digital Input
Master Clock
Digital Core Supply
Digital Buffer (I/O) Supply
Digital Ground (return path for both DCVDD and DBVDD)
Audio Interface Bit Clock
DAC Digital Audio Data
Audio Interface Left / Right Clock/Clock Out
ADC Digital Audio Data
Audio Interface Left / Right Clock
Mono Output
Analogue Output 3 (can be used as Headphone Pseudo Ground)
Right Output 1 (Line or Headphone)
Left Output 1 (Line or Headphone)
Supply for Analogue Output Drivers (LOUT1/2, ROUT1/2)
Right Output 1 (Line or Headphone or Speaker)
Left Output 1 (Line or Headphone or Speaker)
Supply for Analogue Output Drivers (LOUT1/2, ROUT1/2,
MONOUT)
Analogue Supply
Analogue Ground (return path for both AVDD and MVDD)
Reference Voltage Decoupling Capacitor
Midrail Voltage Decoupling Capacitor
Microphone Bias
Right Channel Input 3 or Headphone Plug-in Detection
Left Channel Input 3
Right Channel Input 2
Left Channel Input 2
Right Channel Input 1
Left Channel Input 1
Control Interface Selection
Chip Select / Device Address Selection
Control Interface Data Input / 2-wire Acknowledge output
Control Interface Clock Input
PP Rev 1.77 May 2003
4
DESCRIPTION
Product Preview
WM8750L
ABSOLUTE MAXIMUM RATINGS
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.
The WM8750L has been classified as MSL1, which has an unlimited floor life at <30 C / 85% Relative Humidity and therefore will
not be supplied in moisture barrier bags.
CONDITION
Supply voltages
Voltage range digital inputs
Voltage range analogue inputs
Operating temperature range, T
A
Storage temperature prior to soldering
Storage temperature after soldering
Package body temperature (soldering 10 seconds)
Package body temperature (soldering 2 minutes)
Notes
1.
2.
3.
Analogue and digital grounds must always be within 0.3V of each other.
All digital and analogue supplies are completely independent from each other.
DCVDD must be less than or equal to AVDD & DBVDD.
MIN
-0.3V
DGND -0.3V
AGND -0.3V
-25°C
-65°C
MAX
+3.63V
DBVDD +0.3V
AVDD +0.3V
+85°C
+150°C
+260°C
+183°C
o
30°C max / 85% RH max
RECOMMENDED OPERATION CONDITIONS
PARAMETER
Digital supply range (Core)
Digital supply range (Buffer)
Analogue supplies range
Ground
SYMBOL
DCVDD
DBVDD
AVDD, HPVDD
DGND,AGND, HPGND
MIN
1.42
1.8
1.8
TYP
2.0
2.0
2.0
0
MAX
3.6
3.6
3.6
UNIT
V
V
V
V
PP Rev 1.77 May 2003
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