Datasheet

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SBFS026B − JUNE 2004 − REVISED SEPTEMBER 2007
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Register 2. Digital Filter Control Register
D7
(MSB)
D6 D5 D4 D3 D2 D1
D0
(LSB)
0 0 0 DEM1 DEM0 DDN LGRP1 LGRP0
LGRP0 Interpolation Filter Group Delay
LGRP1 These bits are used to select the number of input samples to be stored in the data buffer before the re-sampler
starts to process the data. This has a direct impact on the group delay or latency of the interpolation filter.
LGRP1 LGRP0 GROUP DELAY
0 0 64 Samples (default)
0 1 32 Samples
1 0 16 Samples
1 1 8 Samples
DDN Decimation Filtering/Direct DownSampling
The DDN bit is used to enable or disable the direct downsampling function of the decimation block.
DDN DECIMATION FILTER OPERATION
0 Decimation filter enabled. (default)
(Must be used when f
sOUT
is less than or equal to f
sIN
.)
1 Direct downsampling enabled without filtering.
(May be enabled when f
sOUT
is greater than f
sIN
.)
DEM0 Digital De-Emphasis Filtering
DEM1 These bits are used to configure the digital de-emphasis filter function.
DEM1 DEM0 DE-EMPHASIS FILTER
0 0 Disabled (default)
0 1 48kHz Input Sampling Rate
1 0 44.1kHz Input Sampling Rate
1 1 32kHz Input Sampling Rate