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SSM6515 Datasheet(PDF) 16 Page - Analog Devices |
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SSM6515 Datasheet(HTML) 16 Page - Analog Devices |
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16 / 40 page ![]() Data Sheet SSM6515 THEORY OF OPERATION analog.com Rev. 0 | 16 of 40 Table 13. BCLK_RATE Selection Table1, 2 LRCLK (kHz) BCLK_RATE: Bits[4:0] of Register Address 0x05 00001 00010 00011 00100 00101 00110 00111 01000 01001 01010 01011 01100 01101 01110 01111 10000 10001 BCLK: FSYNC Ratio 83 N/A 256 400 500 512 600 768 800 1000 1024 1536 1600 2000 2048 3072 4000 4096 124 200 256 400 500 512 600 768 800 1000 1024 1536 1600 2000 2048 3072 4000 4096 163 N/A 128 200 250 256 300 384 400 500 512 768 800 1000 1024 1536 1600 2048 244 100 128 200 250 256 300 384 400 500 512 768 800 1000 1024 1536 1600 2048 323 N/A 64 100 125 128 150 192 200 250 256 384 400 500 512 768 800 1024 44.15 50 64 100 125 128 150 192 200 250 256 384 400 500 512 768 800 1024 485 50 64 100 125 128 150 192 200 250 256 384 400 500 512 768 800 1024 88.25 N/A 32 50 N/A 64 75 96 100 125 128 192 200 250 256 384 400 512 964 N/A 32 50 N/A 64 75 96 100 125 128 192 200 250 256 384 400 512 176.45 N/A N/A N/A N/A 32 N/A 48 50 N/A 64 96 100 125 128 192 200 256 1924 N/A N/A N/A N/A 32 N/A 48 50 N/A 64 96 100 125 128 192 200 256 3844 N/A N/A N/A N/A N/A N/A N/A N/A N/A 32 48 50 N/A 64 96 N/A N/A 7684 N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A N/A 32 48 N/A N/A 1 Table 13 assumes a minimum of two channels. 2 N/A means not applicable. 3 32 kHz, 44.1 kHz, and 48 kHz are the sampling rates used to scale the ratio calculations for the SSM6515. 8 kHz and 16 kHz are scaled as 4x and 2x the 32 kHz settings, respectively. 4 32 kHz, 44.1 kHz, and 48 kHz, are the sampling rates used to scale the ratio calculations for the SSM6515. 12 kHz, 24 kHz, 96 kHz, 192 kHz, 384 kHz, and 768 kHz are scaled as 4x, 2x, 1/2, 1/4, 1/8, and 1/16 of the 48 kHz settings, respectively. 5 32 kHz, 44.1 kHz, and 48 kHz are the sampling rates used to scale the ratio calculations for the SSM6515. 88.2 kHz and 176.4 kHz are scaled as 1/2 and 1/4 of the 44.1 kHz settings, respectively. STEREO (I2S/LEFT JUSTIFIED) OPERATING MODE Stereo modes use both edges of the FSYNC signal to determine placement of data. Stereo mode is enabled when SPT_SAI_MODE = 0, and the I2S or left justified format is determined by the SPT_DATA_FORMAT register. The I2S or left justified formats accepts any number of BCLK cycles per FSYNC cycle as long as it is a supported BCLK rate. Right justified operation can be achieved by using the delay by 8, 12, and 16 BCLK selections in the SPT_DATA_FORMAT register. The amount of delay to achieve this is dependent on the number of BCLK cycles per channel. The SPT_SLOT_SEL register can select which channel of I2S is routed to the DAC. Sample rates from 8 kHz to 768 kHz are accepted. TDM OPERATING MODE The TDM operating mode allows more channels to use a single serial interface bus. The FSYNC signal operates at the desired sample rate. A rising edge of the FSYNC signal indicates the start of a new frame. Each chip on the TDM bus can occupy 16, 24, or 32 BCLK cycles. This is set with the SPT_SLOT_WIDTH register and all chips on the bus must have the same setting. Up to 32 SSM6515 chips can be used on a single TDM bus, but only four unique I2C device addresses are available. The SSM6515 automatically determines how many possible chips can be placed on the bus from the BCLK rate. There is no limit to the total number of BCLK cycles per FSYNC pulse, except for the maximum 50 MHz frequency of BCLK. The TDM slot data the SSM6515 device routes to the DAC is determined by the SPT_SLOT_SEL bits. PDM OPERATING MODE By setting the PDM_MODE bit to 1, the DAC can be driven with 1-bit PDM data on SDATAI. In this case, a 2.8224 MHz to 3.072 MHz, 5.6448 MHz to 6.144 MHz, or 11.2896 MHz to 12.288 MHz CLK must be provided on the BCLK pin. The frequency range is selected via the PDM_FS register. PDM input data is latched on both edges of the clock. The PDM_CHAN_SEL register state determines which channel (CH0/ CH1) is sent to the DAC. The PDM_PHASE_SEL register determines which two edges of PDM_CLK are in phase, either falling then rising or rising then falling. |
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