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PCM1691 Datasheet(PDF) 35 Page - Texas Instruments |
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PCM1691 Datasheet(HTML) 35 Page - Texas Instruments |
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35 / 47 page  PCM1691 www.ti.com.............................................................................................................................................................................................. SBAS450 – OCTOBER 2008 DEC HEX B7 B6 B5 B4 B3 B2 B1 B0 71 47 RSV RSV RSV RSV RSV RSV RSV RSV 72 48 ATDA17 ATDA16 ATDA15 ATDA14 ATDA13 ATDA12 ATDA11 ATDA10 73 49 ATDA27 ATDA26 ATDA25 ATDA24 ATDA23 ATDA22 ATDA21 ATDA20 74 4A ATDA37 ATDA36 ATDA35 ATDA34 ATDA33 ATDA32 ATDA31 ATDA30 75 4B ATDA47 ATDA46 ATDA45 ATDA44 ATDA43 ATDA42 ATDA41 ATDA40 76 4C ATDA57 ATDA56 ATDA55 ATDA54 ATDA53 ATDA52 ATDA51 ATDA50 77 4D ATDA67 ATDA66 ATDA65 ATDA64 ATDA63 ATDA62 ATDA61 ATDA60 78 4E ATDA77 ATDA76 ATDA75 ATDA74 ATDA73 ATDA72 ATDA71 ATDA70 79 4F ATDA87 ATDA86 ATDA85 ATDA84 ATDA83 ATDA82 ATDA81 ATDA80 RSV Reserved Reserved; do not use. ATDAx[7:0] Digital attenuation level setting Where x = 1 to 8, corresponding to the DAC output (VOUTx). Each DAC output (VOUT1 through VOUT8) has a digital attenuation function. The attenuation level can be set from 0 dB to R dB, in S-dB steps. Changes in attenuator levels are made by incrementing or decrementing one step (S dB) for every 8/fS time interval until the programmed attenuator setting is reached. Alternatively, the attenuation level can be set to infinite attenuation (or mute). R (range) and S (step) is –63 and 0.5 for DAMS = 0, and –100 and 1.0 for DAMS = 1, respectively. The DAMS bit is defined in register 70 (46h). Table 17 shows attenuation levels for various settings. The attenuation level for each channel can be set individually using the following formula: Attenuation level (dB) = S × (ATDAx[7:0]DEC – 255) where ATDAx[7:0]DEC = 0 through 255. For ATDAx[7:0]DEC = 0 through 128 with DAMS = 0, or 0 through 154 with DAMS = 1, attenuation is set to infinite attenuation (mute). Default value: 1111 1111. Table 17. Attenuation Levels for Various Settings ATDAx[7:0] ATTENUATION LEVEL SETTING BINARY DECIMAL DAMS = 0 DAMS = 1 1111 1111 255 0 dB, no attenuation (default) 0 dB, no attenuation (default) 1111 1110 254 –0.5 dB –1 dB 1111 1101 253 –1.0 dB –2 dB ... ... ... ... 1001 1100 156 –45.9 dB –99 dB 1001 1011 155 –50.0 dB –100 dB 1001 1010 154 –50.5 dB Mute ... ... ... ... 1000 0010 130 –62.5 dB Mute 1000 0001 129 –63.0 dB Mute 0000 0000 128 Mute Mute ... ... ... ... 0000 0000 0 Mute Mute Copyright © 2008, Texas Instruments Incorporated Submit Documentation Feedback 35 Product Folder Link(s): PCM1691 |
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