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Stereo Audio CODEC
DESCRIPTION
The WM8734 is a low power stereo CODEC ideal for MD,
CD-RW machines and DAT recording applications.
Stereo line inputs are provided, along with a mute function
and programmable line level volume control.
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 line level outputs are 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 level
controls, mutes, de-emphasis and power management
facilities. The device is available in 20-lead SSOP or 28-
lead, 5x5mm QFN packages.
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WM8734
FEATURES
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Audio Performance
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90dB SNR (‘A’ weighted @ 48kHz) ADC
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100dB SNR (‘A’ weighted @ 48kHz) DAC
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2.7 – 3.6V Digital Supply Operation
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2.7 – 3.6V Analogue Supply Operation
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
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I S, Left, Right Justified or DSP
16/20/24/32 bit Word Lengths
Master or Slave Clocking Mode
2
Stereo Audio Inputs and Outputs
20-lead SSOP or 5x5mm QFN Package Options
APPLICATIONS
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CD and Minidisc Recorder
MP3 Player / Recorder
BLOCK DIAGRAM
CSB
SDIN
MODE
SCLK
AVDD
CONTROL INTERFACE
VMID
AGND
W
WM8734
RLINEIN
VOL
ADC
DAC
MUTE
ROUT
+12 to -34.5dB,
1.5dB Steps
DIGITAL
FILTERS
LLINEIN
VOL
ADC
DAC
MUTE
LOUT
+12 to -34.5dB,
1.5dB Steps
CLKIN
DIVIDER
(Div x1, x2)
DIGTAL AUDIO INTERFACE
DBVDD
MCLK
DACDAT
DACLRC
WOLFSON MICROELECTRONICS plc
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ADCLRC
ADCDAT
Production Data, November 2006, Rev 4.1
Copyright
2006
Wolfson Microelectronics plc
DCVDD
DGND
BCLK
WOLFSON [ WOLFSON MICROELECTRONICS PLC ]
