PDF WM8731 Data sheet ( Hoja de datos )

Número de pieza	WM8731
Descripción	Portable Internet Audio CODEC
Fabricantes	Wolfson Microelectronics plc
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No Preview Available ! w WM8731 / WM8731L Portable Internet Audio CODEC with Headphone Driver and Programmable Sample Rates 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). BLOCK DIAGRAM 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 - I2S, 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 AVDD VMID AGND MICBIAS RLINEIN MICIN VOL + 12 to - 34 .5 dB , 1 .5 dB Steps 0 dB / 20 dB LLINEIN VOL + 12 to - 34 .5 dB , 1 . 5 dB Steps MUTE MUTE MUX MUTE MUTE MUX ADC ADC OSC CLKIN DIVIDER ( Div x 1 , x 2) CLKOUT DIVIDER ( Div x 1 , x 2 ) CONTROL INTERFACE DIGITAL FILTERS DAC DAC DIGTAL AUDIO INTERFACE Bypass MUTE ATTEN / MUTE Side Tone MUTE MUTE Side Tone ATTEN / MUTE MUTE Bypass W WM8731 + 6 to - 73 dB 1 dB Steps VOL / MUTE H/P DRIVER VOL / MUTE + 6 to - 73 dB 1 dB Steps H/P DRIVER HPVDD HPGND RHPOUT ROUT LOUT LHPOUT WOLFSON MICROELECTRONICS plc Production Data, October 2012, Rev 4.9 Copyright 2012 Wolfson Microelectronics plc 1 page WM8731 / WM8731L Production Data PIN DESCRIPTION 28 PIN SSOP 28 PIN QFN NAME TYPE DESCRIPTION 1 5 DBVDD Supply Digital Buffers VDD 2 6 CLKOUT Digital Output Buffered Clock Output 37 BCLK Digital Input/Output Digital Audio Bit Clock, Pull Down, (see Note 1) 4 8 DACDAT Digital Input DAC Digital Audio Data Input 5 9 DACLRC Digital Input/Output DAC Sample Rate Left/Right Clock, Pull Down (see Note 1) 6 10 ADCDAT Digital Output ADC Digital Audio Data Output 7 11 ADCLRC Digital Input/Output ADC Sample Rate Left/Right Clock, Pull Down (see Note 1) 8 12 HPVDD Supply Headphone VDD 9 13 LHPOUT Analogue Output Left Channel Headphone Output 10 14 RHPOUT Analogue Output Right Channel Headphone Output 11 15 12 16 HPGND LOUT Ground Analogue Output Headphone GND Left Channel Line Output 13 17 14 18 ROUT AVDD Analogue Output Supply Right Channel Line Output Analogue VDD 15 19 AGND Ground Analogue GND 16 20 VMID Analogue Output Mid-rail reference decoupling point 17 21 MICBIAS Analogue Output Electret Microphone Bias 18 22 MICIN 19 23 RLINEIN Analogue Input Analogue Input Microphone Input (AC coupled) Right Channel Line Input (AC coupled) 20 24 LLINEIN 21 25 MODE Analogue Input Digital Input Left Channel Line Input (AC coupled) Control Interface Selection, Pull Up (see Note 1) 22 26 CSB Digital Input 3-Wire MPU Chip Select/ 2-Wire MPU interface address selection, active low, Pull up (see Note 1) 23 27 SDIN Digital Input/Output 3-Wire MPU Data Input / 2-Wire MPU Data Input 24 28 SCLK 25 1 XTI/MCLK 26 2 XTO Digital Input Digital Input Digital Output 3-Wire MPU Clock Input / 2-Wire MPU Clock Input Crystal Input or Master Clock Input (MCLK) Crystal Output 27 3 28 4 DCVDD DGND Supply Ground Digital Core VDD Digital GND Note: 1. Pull Up/Down only present when Control Register Interface ACTIVE=0 to conserve power. 2. It is recommended that the QFN ground paddle is connected to analogue ground on the application PCB. w PD, Rev 4.9, October 2012 5 5 Page WM8731 / WM8731L Production Data ELECTRICAL CHARACTERISTICS – WM8731L Test Conditions AVDD, HPVDD, DBVDD = 1.8V, AGND = 0V, DCVDD = 1.5V, DGND = 0V, TA = +25oC, Slave Mode, fs = 48kHz, XTI/MCLK = 256fs unless otherwise stated. PARAMETER SYMBOL TEST CONDITIONS MIN TYP MAX UNIT Digital Logic Levels (CMOS Levels) Input LOW level Input HIGH level Output LOW VIL VIH VOL 0.7 x DBVDD 0.3 x DBVDD 0.10 x DBVDD V V V Output HIGH VOH Power On Reset Threshold (DCVDD) 0.9 x DBVDD V DCVDD Threshold On -> Off Hysteresis DCVDD Threshold Off -> On Analogue Reference Levels Vth VIH VOL 0.9 V 0.3 V 0.6 V Reference voltage (VMID) Potential divider resistance Line Input to ADC VVMID RVMID AVDD/2 50k V Ω Input Signal Level (0dB) VINLINE 1.0 AVDD/3.3 Vrms Signal to Noise Ratio (Note 1,3) SNR A-weighted, 0dB gain @ fs = 48kHz A-weighted, 0dB gain @ fs = 96kHz 75 85 85 dB Dynamic Range (Note 3) DR A-weighted, -60dB full 80 scale input 88 dB Total Harmonic Distortion THD -1dB input, 0dB gain -76 -60 dB Power Supply Rejection Ratio PSRR 1kHz, 100mVpp 50 dB 20Hz to 20kHz, 100mVpp 45 ADC channel separation 1kHz input 90 dB Programmable Gain 1kHz input -34.5 0 +12 dB Rsource < 50Ω Programmable Gain Step Size Guaranteed Monotonic 1.5 dB Mute attenuation 0dB, 1kHz input 80 dB Input Resistance RINLINE 0dB gain 20k 30k Ω 12dB gain 10k 15k Input Capacitance CINLINE 10 pF w PD, Rev 4.9, October 2012 11 11 Page

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