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WM8731CLSEFL Datasheet(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8731CLSEFL Datasheet(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 65 page  w WM8731 / WM8731L Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates WOLFSON MICROELECTRONICS plc Production Data, October 2012, Rev 4.9 Copyright 2012 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 RHPOUT LHPOUT ROUT LOUT RLINEIN LLINEIN VMID AVDD AGND 0dB / 20 dB MICIN + 12 to - 34 .5 dB , 1.5 dB Steps +6 to - 73 dB 1 dB Steps HPVDD HPGND +6 to - 73 dB 1 dB Steps OSC MICBIAS MUTE Bypass Bypass CLKIN DIVIDER ( Div x 1 , x 2) CLKOUT DIVIDER ( Div x 1 , 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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