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WM8731 Datasheet(PDF) 1 Page - Wolfson Microelectronics plc

Part No. WM8731
Description  Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates
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Maker  WOLFSON [Wolfson Microelectronics plc]
Homepage  http://www.wolfsonmicro.com
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WM8731 Datasheet(HTML) 1 Page - Wolfson Microelectronics plc

 
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WM8731 / WM8731L
Portable Internet Audio CODEC with Headphone Driver
and Programmable Sample Rates
WOLFSON MICROELECTRONICS plc
To receive regular email updates, sign up at http://www.wolfsonmicro.com/enews/
Production Data, August 2006, Rev 4.3
Copyright
©2006 Wolfson Microelectronics plc
DESCRIPTION
The WM8731 or WM8731L (WM8731/L) are low power
stereo CODECs with an integrated headphone driver. The
WM8731/L is designed specifically for portable MP3 audio
and speech players and recorders. The WM8731 is also
ideal for MD, CD-RW machines and DAT recorders.
Stereo line and mono microphone level audio inputs are
provided, along with a mute function, programmable line
level volume control and a bias voltage output suitable for
an electret type microphone.
Stereo 24-bit multi-bit sigma delta ADCs and DACs are
used with oversampling digital interpolation and decimation
filters. Digital audio input word lengths from 16-32 bits and
sampling rates from 8kHz to 96kHz are supported.
Stereo audio outputs are buffered for driving headphones
from a programmable volume control, line level outputs are
also provided along with anti-thump mute and power
up/down circuitry.
The device is controlled via a 2 or 3 wire serial interface.
The interface provides access to all features including
volume controls, mutes, de-emphasis and extensive power
management facilities. The device is available in a small 28-
lead SSOP package or the smaller 28 lead quad flat
leadless package (QFN).
FEATURES
Highly Efficient Headphone Driver
Audio Performance
-
ADC SNR 90dB (‘A’ weighted) at 3.3V, 85dB at 1.8V
-
DAC SNR 100dB
(‘A’ weighted) at 3.3V, 95dB at 1.8V
Low Power
-
Playback only 22mW, 8mW (‘L’ Variant)
-
Analogue Pass Through 12mW, 3.5mW (‘L’ variant)
-
1.42 – 3.6V Digital Supply Operation
-
2.7 – 3.6V Analogue Supply Operation
-
1.8 – 3.6V Analogue Supply Operation (‘L’ Variant)
ADC and DAC Sampling Frequency: 8kHz – 96kHz
Selectable ADC High Pass Filter
2 or 3-Wire MPU Serial Control Interface
Programmable Audio Data Interface Modes
-
I
2S, Left, Right Justified or DSP
-
16/20/24/32 bit Word Lengths
-
Master or Slave Clocking Mode
Microphone Input and Electret Bias with Side Tone Mixer
Available in 28-lead SSOP or 28-lead QFN package
APPLICATIONS
Portable MP3 Players and Recorders
CD and Minidisc Recorders
PDAs / smartphones
BLOCK DIAGRAM
MUX
MUX
VOL
VOL
ADC
ADC
DIGITAL
FILTERS
DIGTAL AUDIO INTERFACE
CONTROL INTERFACE
DAC
DAC
VOL/
MUTE
VOL/
MUTE
H/P
DRIVER
H/P
DRIVER
Σ
Σ
RHPOUT
LHPOUT
ROUT
LOUT
RLINEIN
LLINEIN
VMID
AVDD
AGND
0dB/
20dB
MICIN
+12 to -34.5dB, 1.5dB
Steps
+6 to -73dB
1 dB Steps
HPVDD
HPGND
+6 to -73dB
1 dB Steps
OSC
MICBIAS
MUTE
Bypass
Bypass
CLKIN
DIVIDER
(Div x1, x2)
CLKOUT
DIVIDER
(Div x1, x2)
ATTEN/
MUTE
MUTE
MUTE
ATTEN/
MUTE
MUTE
MUTE
MUTE
MUTE
MUTE
+12 to -34.5dB, 1.5dB
Steps
Side Tone
Side Tone
W
WM8731


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