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WM8716 Datasheet(PDF) 10 Page - Wolfson Microelectronics plc |
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WM8716 Datasheet(HTML) 10 Page - Wolfson Microelectronics plc |
10 / 26 page WM8716 Production Data w PD, Rev 4.2,August 2008 10 AUDIO DATA INTERFACE Data may be input at a rate corresponding to the system clock having a rate of 256fs or 384fs or 512fs or 768fs, in which case an oversampling ratio of 128x is selected. Alternatively a rate of 128fs or 192fs may be used, in which case the first filter stage is bypassed and an oversampling ratio of 64x results. Finally, in MODE8X, data may be input at 8x the normal rate, in which case separate input pins are used to input the two stereo channels of data (unless DIFFHW mode and MODE8X are both selected, in which case only a mono channel is converted differentially). In MODE8X all filter stages are by-passed, prior to the sigma delta modulator. Data is input MSB first in all modes. NORMAL SAMPLE RATE In normal mode, the data is input serially on one pin for both left and right channels. Data can be “right justified” meaning that the last 16, 20 or 24 bits (depending on chosen PCM word length) that were clocked in prior to the transition on LRCIN are valid. Alternatively data can be “left justified” (20 and 24-bit PCM data only), where the bits are clocked in as the first 20 or 24 bits after a transition on LRCIN. For the three I2S modes supported (16-bit, 20-bit and 24-bit PCM data), data is clocked “left justified” except with one additional preceding clock cycle. LRCIN (PIN 1) 16-BIT RIGHT JUSTIFIED DIN (PIN 2) 20-BIT RIGHT JUSTIFIED DIN (PIN 2) 24-BIT RIGHT JUSTIFIED DIN (PIN 2) 24-BIT LEFT JUSTIFIED DIN (PIN 2) 20-BIT LEFT JUSTIFIED DIN (PIN 2) BCKIN (PIN 3) B2 B1 B0 B2 B1 B0 B2 B1 B0 B0 B0 B23 B22 B21 B19 B18 B17 B23 B22 B21 B20 B19 B4 B3 B2 B1 B0 B0 B19 B18 B17 B15 B2 B1 B0 B2 B1 B0 B2 B1 B0 B23 B22 B21 B19 B18 B17 B0 B4 B3 B2 B1 B0 B23 B22 B21 B20 B19 B19 B18 B17 B15 B2 B1 B0 B2 B1 B0 B2 B1 B0 RIGHT LEFT 1/fs LRCIN (PIN 1) 16-BIT I2S DIN (PIN 2) 24-BIT I2S DIN (PIN 2) 20-BIT I2S DIN (PIN 2) BCKIN (PIN 3) B2 B1 B0 B0 B2 B1 B0 B3 B2 B1 RIGHT LEFT B15 B23 B19 B6 B5 B4 B2 B1 B0 B3 B2 B1 B15 B23 B19 B6 B5 B4 B0 B2 B1 B0 B23 B19 B15 Figure 4 Audio Data Input Format |
Número de pieza similar - WM8716_08 |
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Descripción similar - WM8716_08 |
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