SM5846AP_06 Datasheet, PDF (16/36 Pages) Nippon Precision Circuits Inc – Multi-function Digital Filter

SM5846AP
FUNCTIONAL DESCRIPTION
Mode Switching and Function Switching
The SM5846AP supports several operating modes and function switches. Internal control flags, set by the dig-
ital inputs or serial data input signal from a microprocessor, determine the status of those function switches.
Mode switching/function switch controls
Stage
System
Operating mode switch
Clock switch
Filter switch
Input interface switch
Output interface switch
Name
MDS
HS
ASEL2
ASEL1
CKS
CKEN
DEEM
FSEL2
FSEL1
MUTE
DITH
SYNC
LRS
IBS2
IBS1
OBS
Control request
Input
Control flag
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Yes
(pos. logic) (neg. logic)
Yes
Yes
Yes
Yes
Yes
Yes
Yes
Function
IC control request switch (input pin/control flag)
Operating mode switching
Input clock frequency switching
Crystal oscillator operating control switching
Deemphasis ON/OFF switching
Deemphasis filter sampling frequency set
Mute ON/OFF control
Dither ON/OFF control
Jitter-free/sync mode switching
LRCI (LR clock) input polarity switching
Input data length set
Output data length set
Control request switching
MDS input and device control
Mode switching/function switching is performed
under input pin control when MDS is HIGH, and
under internal flag control when MDS is LOW.
MDS¹
HIGH
LOW
Control request
Input pins
Control flags
1. Switching MDS during device operation is prohibited.
Input pin functions when MDS is LOW
All pins that are part of the microprocessor interface
can be used whenever MDS is LOW.
Pin name
Function
Notes
HS/MDT
Serial data transfer data
clock
ASEL2/MDCK
Serial data transfer clock
input
SYNC/MDLE
Serial data transfer latch
enable input
Used for the
microprocessor
interface
CKS
CKEN
LRS
CKS function switch input
CKEN function switch input
LRS function switch input
Input pin control only
because there is no
corresponding
control flag.
SEIKO NPC CORPORATION —16