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Register Definitions
PCM1774
SLAS551 – JULY 2007
Registers 64 and 65
B15 B14 B13 B12 B11 B10 B9 B8 B7 B6 B5 B4 B3 B2 B1 B0
Register 64 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV HMUL HLV5 HLV4 HLV3 HLV2 HLV1 HLV0
Register 65 0 IDX6 IDX5 IDX4 IDX3 IDX2 IDX1 IDX0 RSV HMUR HRV5 HRV4 HRV3 HRV2 HRV1 HRV0
IDX[6:0]: 100 0000b (40h): Register 64
IDX[6:0]: 100 0001b (41h): Register 65
HMUL: Analog Mute Control for HPL (Line or Headphone L-Channel)
HMUR: Analog Mute Control for HPR (Line or Headphone R-Channel)
Default value: 1
HPOL/LOL and HPOR/LOR can be independently muted to zero level when HMUL and HMUR = 1. These
settings take precedence over analog volume level settings.
HMUL, HMUR = 0 Mute disabled
HMUL, HMUR = 1 Mute enabled (default)
HLV[5:0]: Analog Volume for HPL (Headphone L-Channel)
HRV[5:0]: Analog Volume for HPR (Headphone R-Channel)
Default value: 00 0000.
HPOL/LOL and HPOR/LOR can be independently controlled between 6 dB and –70 dB, with step size
depending on the gain level as shown in Table 7 . Outputs may have zipper noise while changing levels. This
noise can be reduced by selecting zero-cross detection (register 86, ZCRS).
Table 7. Headphone Gain Level Setting
HLV[5:0], GAIN LEVEL HLV[5:0], GAIN LEVEL HLV[5:0], GAIN LEVEL
STEP STEP STEP
HRV[5:0] SETTING HRV[5:0] SETTING HRV[5:0] SETTING
11 1111 3F 6 dB 10 1001 29 –5 dB 01 0011 13 –21 dB
11 1110 3E 5.5 dB 10 1000 28 –5.5 dB 01 0010 12 –22 dB
1 dB
11 1101 3D 5 dB 10 0111 27 –6 dB 01 0001 11 –23 dB
11 1100 3C 4.5 dB 10 0110 26 –6.5 dB 01 0000 10 –24 dB
11 1011 3B 4 dB 10 0101 25 –7 dB 00 1111 0F –26 dB
11 1010 3A 3.5 dB 10 0100 24 –7.5 dB 00 1110 0E –28 dB
11 1001 39 3 dB 10 0011 23 0.5 dB –8 dB 00 1101 0D –30 dB
11 1000 38 2.5 dB 10 0010 22 –8.5 dB 00 1100 0C –32 dB
11 0111 37 2 dB 10 0001 21 –9 dB 00 1011 0B 2 dB –34 dB
11 0110 36 1.5 dB 10 0000 20 –9.5 dB 00 1010 0A –36 dB
11 0101 35 1 dB 01 1111 1F –10 dB 00 1001 09 –38 dB
0.5 dB
11 0100 34 0.5 dB 01 1110 1E –10.5 dB 00 1000 08 –40 dB
11 0011 33 0 dB 01 1101 1D –11 dB 00 0111 07 –42 dB
11 0010 32 –0.5 dB 01 1100 1C –12 dB 00 0110 06 –46 dB
11 0001 31 –1 dB 01 1011 1B –13 dB 00 0101 05 –50 dB
11 0000 30 –1.5 dB 01 1010 1A –14 dB 00 0100 04 –54 dB
10 1111 2F –2 dB 01 1001 19 –15 dB 00 0011 03 4 dB –58 dB
10 1110 2E –2.5 dB 01 1000 18 1 dB –16 dB 00 0010 02 –62 dB
10 1101 2D –3 dB 01 0111 17 –17 dB 00 0001 01 –66 dB
10 1100 2C –3.5 dB 01 0110 16 –18 dB 00 0000 00 –70 dB
10 1011 2B –4 dB 01 0101 15 –19 dB
10 1010 2A –4.5 dB 01 0100 14 –20 dB
24
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