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M4334 Datasheet(PDF) 9 Page - Unisonic Technologies |
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M4334 Datasheet(HTML) 9 Page - Unisonic Technologies |
9 / 9 page M4334 CMOS IC UNISONICTECHNOLOGIESCO.,LTD 9 of 9 www.unisonic.com.tw QW-R502-441A SYSTEM CLOCK The M4334 accepts data at standard audio sample rates including 48, 44.1 and 32 kHz in BRM and 96, 88.2 and 64 kHz in HRM. The LRCK chooses the channel and delineation of data, and the SCLK clocks audio data into the input data buffer. MCLK MCLK must be either 256x, 384x or 512x the desired input sample rate in BRM and either 128x or 192x the desired input sample rate in HRM. The LRCK frequency is equal to Fs, the frequency at which words for each channel are input to the device. The MCLK-to-LRCK frequency ratio is detected automatically during the initialization sequence by counting the number of MCLK transitions during a single LRCK period. Internal dividers are set to generate the proper clocks. The MCLK, LRCK and SCLK must be synchronous. Table 1 illustrates several standard audio sample rates and the required MCLK and LRCK frequencies. MCLK(MHz) HRM BRM LRCK(kHz) 128x 192x 256x 384x 512x 32 4.0960 6.1440 8.1920 12.2880 16.3840 44.1 5.6448 8.4672 11.2896 16.9344 22.5792 48 6.1440 9.2160 12.2880 18.4320 24.5760 64 8.1920 12.2880 88.2 11.2896 16.9344 96 12.2880 18.4320 Table 1. Common Clock Frequencies SCLK The SCLK controls the shifting of data into the input data buffers. The M4334 supports both internal and external SCLK generation modes. Internal SCLK Mode In the Internal SCLK Mode, the SCLK is internally derived and synchronous with MCLK and LRCK. The SCLK/LRCK frequency ratio is either 32, 48, or 64 depending upon data format. Operation in this mode is identical to operation w- ith an external SCLK synchronized with LRCK. This mode allows access to the digital de-emphasis function. While the Internal SCLK Mode is provided to allow access to the de-emphasis filter, the Internal SCLK Mode also eliminates possible clock interference from an external SCLK. External SCLK Mode The M4334 will enter the external SCLK mode when 16 low to high transitions are detected on the DEM/SCLK pin during any phase of the LRCK period. When this mode is enabled, the Internal SCLK Mode and de-emphasis filter cannot be accessed. The M4334 will switch to Internal SCLK Mode if no low to high transitions are detected on the DEM/SCLK pin for 2 consecutive frames of LRCK. UTC assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other parameters) listed in products specifications of any and all UTC products described or contained herein. UTC products are not designed for use in life support appliances, devices or systems where malfunction of these products can be reasonably expected to result in personal injury. Reproduction in whole or in part is prohibited without the prior written consent of the copyright owner. The information presented in this document does not form part of any quotation or contract, is believed to be accurate and reliable and may be changed without notice. |
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