SM5846AP_06 Datasheet, PDF (19/36 Pages) Nippon Precision Circuits Inc – Multi-function Digital Filter

SM5846AP
Other control settings
Input data length select
ISB1 and ISB2 flags are used to set the input data
length.
IBS2
HIGH
HIGH
LOW
LOW
IBS1
HIGH
LOW
HIGH
LOW
Input data
length
20 bits
24 bits
16 bits
32 bits
Notes
The length is set to the
default value of 16 bits
(IBS2 = LOW and IBS1 =
HIGH) after a reset.
LRCI input polarity select
Pin LRS is used to set the LRCI input polarity.
LRS
HIGH
HIGH
LOW
LOW
LRCI
HIGH
LOW
HIGH
LOW
Input channel
Left
Right
Right
Left
Sync mode select
The SYNC pin or flag setting can be used to select
either jitter-free mode or sync mode to control syn-
chronization between input data and internal arith-
metic blocks.
Filter Stage
Operating mode
The SM5846A supports 3 different operating modes
to control output data rate switching. The operating
mode is selected by the state of HS, ASEL1 and
ASEL2.
HS ASEL1 ASEL2
Operating mode¹
Speed
Oversampling
HIGH
LOW
HIGH
Normal-speed
sampling
8-times
HIGH
LOW HIGH
LOW
High-speed
sampling
8-times
4-times
1. Only the above 3 modes are valid.
Operating speed and sampling frequency
The SM5846AP supports sampling frequencies of
32/44.1/48kHz (normal-speed sampling mode) and
64/88.2/96kHz (high-speed sampling mode).
Operating speed
Normal-speed sampling
High-speed sampling
Input sampling frequency
32/44.1/48kHz
64/88.2/96kHz
Deemphasis filter
The SM5846AP contains a digital deemphasis filter
controlled by DEEM.
SYNC
HIGH
LOW
Mode
Notes
Jitter-free mode _{The SYNC flag is set HIGH}
Sync mode ^{(default) after a reset.}
DEEM
HIGH
LOW
Deemphasis
ON
OFF
The sampling frequency is selected by FSEL1 and
FSEL2.
FSEL2 FSEL1
HIGH
HIGH
LOW
LOW
HIGH
LOW
HIGH
LOW
Sampling frequency fs [kHz]
Normal-speed
sampling
High-speed
sampling
44.1
88.2
48
96
44.1
88.2
32
64
Digital attenuator
The digital attenuator is controlled by serial data
from the microprocessor interface. This data can set
attenuation and muting. Note that the digital attenua-
tor is only enabled when MDS is LOW. ATT1 and
ATT2 are used to set the attenuation in normal-speed
sampling and high-speed sampling, respectively.
SEIKO NPC CORPORATION —19