WM8998 Datasheet, PDF (62/307 Pages) Wolfson Microelectronics plc – High Performance Audio Hub CODEC

WM8998
Production Data
SLIMTXnMIX_SRC
SLIMTXnMIX_VOL
SLIMbus TXn
WM8998 supports 6 SLIMbus Output (TX) paths, ie. n = 1, 2, 3, 4, 5 or 6
Figure 24 Digital Core SLIMbus Outputs
5-BAND PARAMETRIC EQUALISER (EQ)
The digital core provides four EQ processing blocks as illustrated in Figure 25. The input source for
each EQ is selectable, and a digital volume control is provided for each path. Each EQ block supports
1 input and 1 output.
The EQ provides selective control of 5 frequency bands as described below.
The low frequency band (Band 1) filter can be configured either as a peak filter or a shelving filter.
When configured as a shelving filter, is provides adjustable gain below the Band 1 cut-off frequency.
As a peak filter, it provides adjustable gain within a defined frequency band that is centred on the
Band 1 frequency.
The mid frequency bands (Band 2, Band 3, Band 4) filters are peak filters, which provide adjustable
gain around the respective centre frequency.
The high frequency band (Band 5) filter is a shelving filter, which provides adjustable gain above the
Band 5 cut-off frequency.
EQnMIX_SRC
EQnMIX_VOL
EQ
5-band Equaliser
EQ1 (50h)
EQ2 (51h)
EQ3 (52h)
EQ4 (53h)
WM8998 supports 4 EQ blocks, ie. n = 1, 2, 3 or 4
Figure 25 Digital Core EQ Blocks
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PD, October 2014, Rev 4.0
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