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PCM1795 Datasheet(PDF) 29 Page - Texas Instruments |
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PCM1795 Datasheet(HTML) 29 Page - Texas Instruments |
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29 / 68 page  Register 18 R/W 0 0 1 0 0 1 0 ATLD FMT2 FMT1 FMT0 DMF1 DMF0 DME MUTE B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Register 16 R/W 0 0 1 0 0 0 0 ATL7 ATL6 ATL5 ATL4 ATL3 ATL2 ATL1 ATL0 Register 17 R/W 0 0 1 0 0 0 1 ATR7 ATR6 ATR5 ATR4 ATR3 ATR2 ATR1 ATR0 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 PCM1795 www.ti.com SLES248A – MAY 2009 – REVISED MARCH 2015 Table 10. Mode Control Register Map (continued) REGISTER B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 Register 20 R/W 0 0 1 0 1 0 0 RSV SRST DSD DFTH MONO CHSL OS1 OS0 Register 21 R/W 0 0 1 0 1 0 1 RSV RSV RSV RSV RSV DZ1 DZ0 PCMZ Register 22 R 0 0 1 0 1 1 0 RSV RSV RSV RSV RSV RSV ZFGR ZFGL Register 23 R 0 0 1 0 1 1 1 RSV RSV RSV ID4 ID3 ID2 ID1 ID0 7.6.1.3 Register Definitions 7.6.1.3.1 R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. When R/W = 1, a read operation is performed. Default value: 0 7.6.1.3.2 ATx[7:0]: Digital Attenuation Level Setting These bits are available for read and write. Default value: 1111 1111b Each DAC output has a digital attenuator associated with it. The attenuator can be set from 0 dB to –120 dB, in 0.5-dB steps. Alternatively, the attenuator can be set to infinite attenuation (or mute). The attenuation data for each channel can be set individually. However, the data load control (the ATLD bit of control register 18) is common to both attenuators. ATLD must be set to '1' in order to change an attenuator setting. The attenuation level can be set using Equation 1. Attenuation level (dB) = 0.5 dB × (ATx[7:0]DEC – 255) where ATx[7:0]DEC = 0 through 255 (1) For ATx[7:0]DEC = 0 through 14, the attenuator is set to infinite attenuation. Table 11 lists the attenuation levels for various settings. Table 11. Attenuation Levels ATx[7:0] DECIMAL VALUE ATTENUATION LEVEL SETTING 1111 1111b 255 0 dB, no attenuation (default) 1111 1110b 254 –0.5 dB 1111 1101b 253 –1.0 dB — — — 0001 0000b 16 –119.5 dB 0000 1111b 15 –120.0 dB 0000 1110b 14 Mute — — — 0000 0000b 0 Mute 7.6.1.3.3 R/W: Read/Write Mode Select When R/W = 0, a write operation is performed. Copyright © 2009–2015, Texas Instruments Incorporated Submit Documentation Feedback 29 Product Folder Links: PCM1795 |
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