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전자부품 데이터시트 검색엔진 |
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전자부품 데이터시트 검색엔진 |
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WM8774IFT 데이터시트(PDF) 1 Page - Wolfson Microelectronics plc |
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WM8774IFT 데이터시트(HTML) 1 Page - Wolfson Microelectronics plc |
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1 / 42 page  WM8774 24-bit, 192kHz 8-Channel Input Stereo Codec WOLFSON MICROELECTRONICS LTD w :: www.wolfsonmicro.com Product Preview, June 2002, Rev 1.0 Copyright 2002 Wolfson Microelectronics Ltd. DESCRIPTION The WM8774 is a high performance, stereo audio codec with an 8 channel input selector. The WM8774 is ideal for surround sound processing applications for home hi-fi, automotive and other audio visual equipment. A stereo 24-bit multi-bit sigma delta ADC is used with an eight stereo channel input selector. Each channel has analogue domain mute and programmable gain control. Digital audio output word lengths from 16-32 bits and sampling rates from 8kHz to 96kHz are supported. A stereo 24-bit multi-bit sigma delta DAC is used with oversampling digital interpolation filters. Digital audio input word lengths from 16-32 bits and sampling rates from 8kHz to 192kHz are supported. Each DAC channel has independent analogue volume and mute control, with a set of input multiplexors allowing selection of an external analogue input into these volume controls. The audio data interface supports I 2S, left justified, right justified and DSP digital audio formats. The device is controlled via a 3 wire serial interface. The interface provides access to all features including channel selection, volume controls, mutes, de-emphasis and power management facilities. The device is available in a 64-pin TQFP package. FEATURES • Audio Performance − 106dB SNR (‘A’ weighted @ 48kHz) DAC − 101dB SNR (‘A’ weighted @ 48kHz) ADC • DAC Sampling Frequency: 8kHz – 192kHz • ADC Sampling Frequency: 8kHz – 96kHz • 3-Wire SPI Compatible Serial Control Interface • Master or Slave Clocking Mode • Programmable Audio Data Interface Modes − I 2S, Left, Right Justified or DSP − 16/20/24/32 bit Word Lengths • Stereo DAC with independent analogue and digital volume controls • Analogue Bypass Path Feature • Selectable AUX input to the volume controls • Eight stereo ADC inputs with analogue gain adjust from +19dB to –12dB in 1dB steps • 2.7V to 5.5V Analogue, 2.7V to 3.6V Digital supply Operation • 5V tolerant digital inputs APPLICATIONS BLOCK DIAGRAM • Surround Sound AV Processors and Hi-Fi systems • Automotive Audio VOUTL VOUTR STEREO ADC AUDIO INTERFACE AND DIGITAL FILTERS STEREO DAC AIN2R AIN3L AIN3R AIN4L AIN4R AIN5L AIN5R AIN6L AIN6R RECL RECR AINOPR AINOPL CONTROL INTERFACE AIN2L AIN1R AIN1L AIN7L AIN7R AIN8L AIN8R WM8774 MUTE LOW PASS FILTERS |
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