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PCM1681PWPR Datasheet(PDF) 31 Page - Texas Instruments |
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PCM1681PWPR Datasheet(HTML) 31 Page - Texas Instruments |
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31 / 44 page  PCM1681, PCM1681-Q1 www.ti.com SLES211C – FEBRUARY 2008 – REVISED JULY 2015 8.6.2.13 FLTx: Digital Filter Roll-Off Control per DATA Group Where x = 1 – 4, corresponding to the DATAx. Default value: 1 FLTx DIGITAL FILTER ROLL-OFF CONTROL PER DATA GROUP 0 Sharp roll-off 1 Slow roll-off (default) The FLTx bit allows the user to select the digital filter roll-off characteristic per 2 channels when FLT = 1 is set, so that it is best suited to the application. Two filter roll-off sections are available: sharp or slow. The filter responses for these selections are shown in the Typical Characteristics section. B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 REGISTER 13 0 IDX IDX IDX IDX IDX IDX IDX DAMS AZRO1 AZRO0 RSV RSV RSV RSV RSV 6 5 4 3 2 1 0 8.6.2.14 DAMS: Digital Attenuation Mode Select Default value: 0 DAMS DIGITAL ATTENUATION MODE SELECT 0 Fine step, 0.5 dB/step for 0 to –63 dB range (default) 1 Wide range, 1 dB/step for 0 to –100 dB range The DAMS bit is used to select the digital attenuation mode. 8.6.2.15 AZRO[1:0]: Zero-Flag Channel-Combination Select Default value: 00b AZRO[1:0] ZERO-FLAG CHANNEL-COMBINATION SELECT 00 Combination A (ZR1: DATA1 L-ch, ZR2: DATA1 R-ch) (default) 01 Combination B (ZR1: DATA1–DATA4, ZR2: DATA1–DATA4) 10 Combination C (ZR1: DATA4, ZR2: DATA1–DATA3) 11 Combination D (ZR1: DATA1, ZR2: DATA2–DATA4) The AZRO[1:0] bits are used to select the zero-flag channel combinations for ZR1 and ZR2. B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0 REGISTER 14 0 IDX IDX IDX IDX IDX IDX IDX ZERO8 ZERO7 ZERO6 ZERO5 ZERO4 ZERO3 ZERO2 ZERO1 6 5 4 3 2 1 0 8.6.2.16 ZERO[8:1]: Zero-Detect Status (Read-Only, I2C Interface Only) Default value: N/A The ZERO[8:1] bits show the status of zero detect for each channel. The status is set to 1 by detecting a zero state without regard to the ZREV bit setting. Copyright © 2008–2015, Texas Instruments Incorporated Submit Documentation Feedback 31 Product Folder Links: PCM1681 PCM1681-Q1 |
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