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RT5508 Datasheet(PDF) 16 Page - Richtek Technology Corporation |
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RT5508 Datasheet(HTML) 16 Page - Richtek Technology Corporation |
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16 / 57 page  RT5508 Copyright © 2017 Richtek Technology Corporation. All rights reserved. is a registered trademark of Richtek Technology Corporation www.richtek.com DS5508-01 March 2017 16 Data (I 2S) Interface Data Format The I2S formats supported by the RT5508 are listed below : Interface Data Format BCK Frequency I2S Standard up to 16-bit 32fs I2S Standard up to 24-bit 48fs I2S Standard up to 24-bit 64fs MSB-justified up to 16-bit 32fs MSB-justified up to 24-bit 48fs MSB-justified up to 24-bit 64fs LSB-justified(16-bit) 16-bit 32fs LSB-justified(16-bit) 16-bit 48fs LSB-justified(16-bit) 16-bit 64fs LSB-justified(20-bit) 20-bit 48fs LSB-justified(20-bit) 20-bit 64fs LSB-justified(24-bit) 24-bit 48fs LSB-justified(24-bit) 24-bit 64fs fs : 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz I 2S Sampling Rate I2S can support sampling rate of 8kHz, 11.025kHz, 12kHz, 16kHz, 22.05kHz, 24kHz, 32kHz, 44.1kHz, 48kHz, 88.2kHz, 96kHz. As shown in Figure 10, the sampling rate conversion block is applied to convert the data to internal working sampling rate, that is 44.1kHz or 48KHz. In stereo mode, the gain between two paths can be passed through each other. SRC D I sense PreFilter SPK Protect I 2 S gain SRC gain signal Figure 10. Sampling Rate Setting I2SFORMAT/I2SRATE I2S data format and fs can be set by I2SFOMAT and I2SRATE at register 0x04 to 0x05. RT5508 should be configured to power down or suspend mode before changing I2SFORMAT/ I2SRATE. Input Path I2S input interface is shown in Figure 11. An internal mux select for two audio sources are supported. DATAI is used to provide stereo or pass-through application and uses BCK1/2, LRCK1/2 as its clock and word select signal. The active I2S input is selected by I2SDIS and I2SCHS at register 0x06. After selecting I2S input source, I2SLRS can be used to decide which channel (left, right or mixed) is sent to bi-quads. |
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