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PCM1609A Datasheet(PDF) 22 Page - Texas Instruments |
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PCM1609A Datasheet(HTML) 22 Page - Texas Instruments |
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22 / 43 page  www.ti.com REGISTER DEFINITIONS PCM1609A SLES145A – AUGUST 2005 – REVISED AUGUST 2006 B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 REGISTER 1 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT17 AT16 AT15 AT14 AT13 AT12 AT11 AT10 REGISTER 2 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT27 AT26 AT25 AT24 AT23 AT22 AT21 AT20 REGISTER 3 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT37 AT36 AT35 AT34 AT33 AT32 AT31 AT30 REGISTER 4 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT47 AT46 AT45 AT44 AT43 AT42 AT41 AT40 REGISTER 5 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT57 AT56 AT55 AT54 AT53 AT52 AT51 AT50 REGISTER 6 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT67 AT66 AT65 AT64 AT63 AT62 AT61 AT60 REGISTER 16 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT77 AT76 AT75 AT74 AT73 AT72 AT71 AT70 REGISTER 17 R/W IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 AT87 AT86 AT85 AT84 AT83 AT82 AT81 AT80 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 ATx[7:0] – Digital Attenuation Level Setting where x = 1 through 8, corresponding to the DAC output VOUTx. These bits are read/write. Default value: 1111 1111b Each DAC output, VOUT1 through VOUT8, includes a digital attenuator function. The attenuation level can be set from 0 dB to –63 dB in 0.5-dB steps. Changes in attenuation levels are made by incrementing or decrementing by one step (0.5 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. The attenuation level is calculated using the following formula: Attenuation level (dB) = 0.5 (ATx[7:0]DEC – 255) where ATx[7:0]DEC = 0 through 255. For ATx[7:0]DEC = 0 through 128, the attenuator is set to infinite attenuation. The following table shows attenuation levels for various settings. ATx[7:0] DECIMAL VALUE ATTENUATOR LEVEL SETTING 1111 1111b 255 0 dB, no attenuation (default) 1111 1110b 254 –0.5 dB 1111 1101b 253 –1 dB : : : 1000 0011b 131 –62 dB 1000 0010b 130 –62.5 dB 1000 0001b 129 –63 dB 1000 0000b 128 Mute : : : 0000 0000b 0 Mute 22 Submit Documentation Feedback |
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