WM8731SEFL Wolfson Microelectronics, WM8731SEFL Datasheet
WM8731SEFL
Manufacturer Part Number
WM8731SEFL
Description
Audio CODECs Stereo Codec with H/P
Manufacturer
Wolfson Microelectronics
Specifications of WM8731SEFL
Number Of Adc Inputs
1
Number Of Dac Outputs
1
Conversion Rate
96 KSPS
Interface Type
Serial (2-Wire, 3-Wire, I2S)
Operating Supply Voltage
- 0.3 V to + 3.63 V
Maximum Operating Temperature
+ 85 C
Mounting Style
SMD/SMT
Package / Case
QFN EP
Minimum Operating Temperature
- 40 C
Number Of Channels
2 ADC/2 DAC
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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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).
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FEATURES
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APPLICATIONS
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Highly Efficient Headphone Driver
Audio Performance
-
-
Low Power
-
-
-
-
-
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
-
-
-
Microphone Input and Electret Bias with Side Tone Mixer
Available in 28-lead SSOP or 28-lead QFN package
Portable MP3 Players and Recorders
CD and Minidisc Recorders
PDAs / smartphones
WM8731 / WM8731L
ADC SNR 90dB (‘A’ weighted) at 3.3V, 85dB at 1.8V
DAC SNR 100dB
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)
I
16/20/24/32 bit Word Lengths
Master or Slave Clocking Mode
2
S, Left, Right Justified or DSP
Copyright ©2009 Wolfson Microelectronics plc
(‘A’ weighted) at
Production Data, April 2009, Rev 4.8
3.3V, 95dB at 1.8V
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