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PCM1791A Datasheet(PDF) 36 Page - Texas Instruments |
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PCM1791A Datasheet(HTML) 36 Page - Texas Instruments |
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36 / 58 page  PCM1791A SLES071A − MARCH 2003 − REVISED JANUARY 2004 www.ti.com 36 APPLICATION FOR EXTERNAL DIGITAL FILTER INTERFACE SCK 24 23 22 21 20 19 18 17 16 15 5 6 7 8 9 10 11 12 13 14 PCM1791A RST VDD DGND AGNDF VCCR AGNDR VOUTR− VOUTR+ VCOM MSEL VOUTL− ZEROL ZEROR VCCF VCCL VOUTL+ AGNDC AGNDL LRCK 1 2 3 4 BCK DATA MUTE 28 27 26 25 MS MC MDI MDO VCCC Mode Control WDCK (Word Clock) BCK DATA-L SCK Analog Output Stage (Same as Standard Application) Analog Output Stage (Same as Standard Application) DF1704 DF1706 PMD200 DATA-R Figure 38. Connection Diagram for External DIgital Filter (Internal DF Bypass Mode) Application Application for Interfacing With an External Digital Filter For some applications, it may be desirable to use an external digital filter to perform the interpolation function, as it can provide improved stop-band attenuation when compared to the internal digital filter of the PCM1791A. The PCM1791A supports several external digital filters, including: D Texas Instruments DF1704 and DF1706 D Pacific Microsonics PMD200 HDCD filter/decoder IC D Programmable digital signal processors The external digital filter application mode is accessed by programming the following bit in the corresponding control register: D DFTH = 1 (register 20) The pins used to provide the serial interface for the external digital filter are shown in the connection diagram of Figure 38. The word clock (WDCK) signals must be operated at 8 × or 4× the desired sampling frequency, fS. Pin Assignments When Using the External Digital Filter Interface D LRCK (pin 1): WDCK as word clock input D BCK (pin 2): BCK as bit clock for audio data D DATA (pin 3): DATAL as L-channel audio data input D MUTE (pin 4): DATAR as R-channel audio data input |
Similar Part No. - PCM1791A |
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Similar Description - PCM1791A |
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