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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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
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
