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SM5843AS1 数据表(PDF) 14 Page - Nippon Precision Circuits Inc

部件名 SM5843AS1
功能描述  Audio Multi-function Digital Filter
PDF  24 Pages
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制造商  NPC [Nippon Precision Circuits Inc]
网页  http://www.npc.co.jp/en
标志 NPC - Nippon Precision Circuits Inc

SM5843AS1 数据表(HTML) 14 Page - Nippon Precision Circuits Inc

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SM5843A
×1
NIPPON PRECISION CIRCUITS—14
FUNCTIONAL DESCRIPTION
The basic arithmetic block is shown in figure 1, and
the function of each block is described in the follow-
ing sections.
8-times Oversampling (Interpolation)
The interpolation arithmetic block is comprised of 3
cascaded, 2-times FIR interpolation filters, as shown
in figure 1.
The input signal is sampled at rate fs, and then 8-
times oversampling data is output. Sampling noise in
the 0.5465fs to 7.4535fs stopband for the sharp roll-
off (response 1) characteristic, 0.745fs to 7.255fs for
the slow roll-off (response 2) characteristic, is
removed by the interpolation filter.
Digital Deemphasis
The digital deemphasis filter has the same construc-
tion as analog filters. It is implemented as an IIR fil-
ter to faithfully reproduce the gain and phase
characteristics of standard analog deemphasis filters.
The three sets of filter coefficients for the three fs =
32.0/44.1/48.0
kHz
sampling
frequencies
are
selected by FSEL1 and FSEL2 when the sampling
frequency is specified, as shown in the following
table. Deemphasis is ON when DEMP is HIGH, and
OFF when DEMP is LOW.
Note that test mode is not available for operation.
Figure 1. Arithmetic block diagram
Input
fs
2 - times oversampling
153 - tap (response 1 )or
25 - tap (response 2 )
FIR
2fs
2 - times oversampling
29 - tap FIR
4fs
Deemphasis IIR
filter
Deemphasis ON
4fs
Mute function
4fs
8fs
Output
Deemphasis OFF
2 - times oversampling
17 - tap FIR
FSEL1
FSEL2
Sampling frequency (fs)
LOW
LOW
44.1 kHz
LOW
HIGH
48 kHz
HIGH
LOW
Test mode
HIGH
HIGH
32 kHz



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