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PCM1680 Datasheet(PDF) 23 Page - Texas Instruments |
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PCM1680 Datasheet(HTML) 23 Page - Texas Instruments |
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23 / 33 page  www.ti.com REGISTER DEFINITIONS ATx[7:0]: Digital Attenuation Level Setting PCM1680 SLES133 – MARCH 2005 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 REGISTER 1 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT17 AT16 AT15 AT14 AT13 AT12 AT11 AT10 REGISTER 2 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT27 AT26 AT25 AT24 AT23 AT22 AT21 AT20 REGISTER 3 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT37 AT36 AT35 AT34 AT33 AT32 AT31 AT30 REGISTER 4 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT47 AT46 AT45 AT44 AT43 AT42 AT41 AT40 REGISTER 5 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT57 AT56 AT55 AT54 AT53 AT52 AT51 AT50 REGISTER 6 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT67 AT66 AT65 AT64 AT63 AT62 AT61 AT60 REGISTER 16 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT77 AT76 AT75 AT74 AT73 AT72 AT711 AT70 REGISTER 17 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT87 AT86 AT85 AT84 AT83 AT82 AT81 AT80 where x = 1–8, corresponding to the DAC output VOUTx. Default value: 1111 1111b ATx[7:0] DECIMAL VALUE ATTENUATION LEVEL SETTING DAMS = 0 DAMS = 1 1111 1111b 255 0 dB, no attenuation (default) 0 dB, no attenuation (default) 1111 1110b 254 –0.5 dB –1 dB 1111 1101b 253 –1 dB –2 dB : : : : 1001 1100b 156 –49.5 dB –99 dB 1001 1011b 155 –50 dB –100 dB 1001 1010b 154 –50.5 dB Mute : : : : 1000 0010b 130 –62.5 dB Mute 1000 0001b 129 –63 dB Mute 1000 0000b 128 Mute Mute : : : : 0000 0000b 0 Mute Mute 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 attenuation levels are made by incrementing or decrementing by one step (S-dB) for every 8/fS time interval until the programmed attenuation setting is reached. Alternatively, the attenuation level can be set to infinite attenuation (or mute). Range (R) and step (S) are –63 and 0.5, respectively, for DAMS = 0 and –100 and 1, respectively, for DAMS = 1. The DAMS bit is defined in register 13. The attenuation data for each channel can be set individually. The attenuation level can be calculated using the following formula: Attenuation level (dB) = S • (ATx[7:0] DEC – 255) where ATx[7:0]DEC = 0 through 255. For ATx[7:0]DEC = 0 through 128 with DAMS = 0 or for ATx[7:0]DEC = 0 through 154 with DAMS = 1, the attenuation is set to infinite attenuation (mute). 23 |
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