PCM3793A
PCM3794A
www.ti.com
SLAS529A–JANUARY 2007–REVISED FEBRUARY 2007
Registers 68 and 69
B15
B14
IDX6
IDX6
B13
IDX5
IDX5
B12
IDX4
IDX4
B11
IDX3
IDX3
B10
IDX2
IDX2
B9
B8
B7
B6
B5
B4
B3
B2
B1
B0
Register 68
Register 69
0
IDX1
IDX1
IDX0
IDX0
RSV
RSV
PMUL
PMUR
ATL5
ATR5
ATL4
ATR4
ATL3
ATR3
ATL2
ATR2
ATL1
ATR1
ATL0
ATR0
0
IDX[6:0]: 100 0100b (44h): Register 68
IDX[6:0]: 100 0101b (45h): Register 69
PMUL: Digital Soft Mute Control for DAL (DAC, L-Channel)
PMUR: Digital Soft Mute Control for DAR (DAC R-Channel)
Default value: 0
The digital inputs of the DAC can be independently muted by setting PMUL and PMUR = 1. The digital data is
changed from the current attenuation level to mute level by a 1-dB step for every 8/fS time period. When PMUL
and PMUR are set to 0, the digital data is changed from the mute level to the current attenuation level by a 1-dB
step for every 8/fS time period. In the PCM3793A/94A, audible zipper noise can be reduced by selecting
zero-cross detection (register 86, ZCRS).
PMUL, PMUR = 0
PMUL, PMUR = 1
Mute disabled (default)
Mute enabled
ATL[5:0]: Digital Attenuation Setting for DAL (L-Channel DAC)
ATR[5:0]: Digital Attenuation Setting for DAR (R-Channel DAC)
Default value: 11 1111b
The digital inputs of the DAC can be independently attenuated. The attenuation of the digital input is changed by
a 1-dB step for every 8/fS time period. Audible zipper noise in the PCM3793A/94A can be reduced by selecting
zero-cross detection (register 86, ZCRS).
Table 9. Digital Attenuation Setting
ATL[5:0],
ATR[5:0]
ATTENUATION LEVEL
SETTING
ATL[5:0],
ATR[5:0]
ATTENUATION LEVEL
SETTING
ATL[5:0],
ATR[5:0]
ATTENUATION LEVEL
SETTING
11 1111
3F
3E
3D
3C
3B
3A
39
38
37
36
35
34
33
32
31
30
2F
2E
2D
2C
2B
2A
0 dB (default)
–1 dB
10 1001
29
28
27
26
25
24
23
22
21
20
1F
1E
1D
1C
1B
1A
19
18
17
16
15
14
–22 dB
–23 dB
–24 dB
–25 dB
–26 dB
–27 dB
–28 dB
–29 dB
–30 dB
–31 dB
–32 dB
–33 dB
–34 dB
–35 dB
–36 dB
–37 dB
–38 dB
–39 dB
–40 dB
–41 dB
–42 dB
–43 dB
01 0011
13
12
11
10
0F
0E
0D
0C
0B
0A
09
08
07
06
05
04
03
02
01
00
–44 dB
–45 dB
–46 dB
–47 dB
–48 dB
–49 dB
–50 dB
–51 dB
–52 dB
–53 dB
–54 dB
–55 dB
–56 dB
–57 dB
–58 dB
–59 dB
–60 dB
–61 dB
–62 dB
Mute
11 1110
11 1101
11 1100
11 1011
11 1010
11 1001
11 1000
11 0111
11 0110
11 0101
11 0100
11 0011
11 0010
11 0001
11 0000
10 1111
10 1110
10 1101
10 1100
10 1011
10 1010
10 1000
10 0111
10 0110
10 0101
10 0100
10 0011
10 0010
10 0001
10 0000
01 1111
01 1110
01 1101
01 1100
01 1011
01 1010
01 1001
01 1000
01 0111
01 0110
01 0101
01 0100
01 0010
01 0001
01 0000
00 1111
00 1110
00 1101
00 1100
00 1011
00 1010
00 1001
00 1000
00 0111
00 0110
00 0101
00 0100
00 0011
00 0010
00 0001
00 0000
–2 dB
–3 dB
–4 dB
–5 dB
–6 dB
–7 dB
–8 dB
–9 dB
–10 dB
–11 dB
–12 dB
–13 dB
–14 dB
–15 dB
–16 dB
–17 dB
–18 dB
–19 dB
–20 dB
–21 dB
34
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