WM5102 Datasheet, PDF (165/334 Pages) Wolfson Microelectronics plc – Audio Hub CODEC with Voice Processor DSP

Production Data
WM5102
OUTPUT SIGNAL PATH DIGITAL VOLUME LIMIT
A digital limit control is provided on each of the output signal paths. Any signal which exceeds the
applicable limit will be clipped at that level. The limit control is implemented in the digital domain,
before the output path DACs.
For typical applications, a limit of 0dBFS is recommended for the analogue output paths (OUT1,
OUT2, OUT3 and OUT4).
The digital speaker output (OUT5) can handle signal levels up to +3dBFS; a maximum setting of
+3dBFS is recommended for this output path.
Caution is advised when selecting other limits, as the output signal may clip in the digital and/or
analogue stages of the respective signal path(s).
The digital limit register fields are described in Table 66 and Table 67.
REGISTER BIT
ADDRESS
LABEL
R1042
(0412h
7:0 OUT1L_VOL_LIM
[7:0]
DAC
Volume
Limit 1L
R1046
(0416h
DAC
Volume
Limit 1R
7:0 OUT1R_VOL_LI
M [7:0]
R1050
(041Ah
DAC
Volume
Limit 2L
7:0 OUT2L_VOL_LIM
[7:0]
DEFAULT
DESCRIPTION
81h
Output Path 1 (Left) Digital Limit
-6dBFS to +6dBFS in 0.5dB steps
00h to 73h = Reserved
74h = -6.0dBFS
75h = -5.5dBFS
… (0.5dB steps)
80h = 0.0dBFS
… (0.5dB steps)
8Bh = +5.5dBFS
8Ch = +6.0dBFS
8Dh to FFh = Reserved
(see Table 67 for limit range)
81h
Output Path 1 (Right) Digital Limit
-6dBFS to +6dBFS in 0.5dB steps
00h to 73h = Reserved
74h = -6.0dBFS
75h = -5.5dBFS
… (0.5dB steps)
80h = 0.0dBFS
… (0.5dB steps)
8Bh = +5.5dBFS
8Ch = +6.0dBFS
8Dh to FFh = Reserved
(see Table 67 for limit range)
81h
Output Path 2 (Left) Digital Limit
-6dBFS to +6dBFS in 0.5dB steps
00h to 73h = Reserved
74h = -6.0dBFS
75h = -5.5dBFS
… (0.5dB steps)
80h = 0.0dBFS
… (0.5dB steps)
8Bh = +5.5dBFS
8Ch = +6.0dBFS
8Dh to FFh = Reserved
(see Table 67 for limit range)
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PD, June 2014, Rev 4.2
165