XWM8739SEDS/V Ver la hoja de datos (PDF) - Cirrus Logic
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XWM8739SEDS/V Datasheet PDF : 37 Pages
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WM8739
Stereo Audio ADC
DESCRIPTION
The WM8739 is a stereo audio ADC. The WM8739 is
designed specifically for portable MP3 audio and speech
players and recorders. The WM8739 is also ideal for MD,
CD-RW machines and DAT recorders.
Stereo line-level audio inputs are provided, along with a
mute and volume function, and master or slave mode
clocking schemes. The device also has a programmable
high pass filter to remove residual DC offsets.
Stereo 24-bit multi-bit sigma delta ADCs are used with
oversampling digital interpolation and digital filters. Digital
audio output word lengths from 16-32 bits and sampling
rates from 8kHz to 96kHz are supported.
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 20-lead
SSOP package.
BLOCK DIAGRAM
FEATURES
• 90dB SNR (‘A’ weighted @ 48kHz) ADC
• Low Power
- Recording: 37mW (WM8739) / 12mW
- Standby and Powerdown modes down to 1µA
• Low Supply Voltages
- 2.7 – 3.6V Analogue Supply
- 1.42 – 3.6V Digital Supply
• Selectable Sample Rate: 8kHz – 96kHz
• Selectable ADC High Pass Filter
• 2 or 3-Wire MPU Serial Control Interface
• Programmable Audio Data Interface Modes
- I2S, Left, Right Justified or DSP
- 16/20/24/32 bit Word Lengths
- Master or Slave Clocking Mode
• 20-lead SSOP
APPLICATIONS
• CD, Minidisc and DAT Recorders
• General Purpose Audio Digitisation
AVDD
VMID
AGND
RLINEIN
VOL/
MUTE
+12 to -34.5dB,
1.5dB Steps
LLINEIN
VOL/
MUTE
+12 to -34.5dB,
1.5dB Steps
CONTROL INTERFACE
ADC
ADC
DIGITAL
FILTERS
W
WM8739
ADCDAT
ADCLRC
BCLK
OSC
DIV2
WOLFSON MICROELECTRONICS plc
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Production Data, July 2008, Rev 4.2
Copyright ©2008 Wolfson Microelectronics plc
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