SM5846AP Datasheet, PDF (1/36 Pages) Nippon Precision Circuits Inc – Multi-function Digital Filter

NIPPON PRECISION CIRCUITS INC.
SM5846AP
Multi-function Digital Filter
OVERVIEW
The SM5846AP is a multi-function digital filter that
incorporates 4/8 times oversampling digital audio
signal reproduction, digital deemphasis, digital
attenuation and soft mute functions. The I/O inter-
face allows serial data transmission of 16/20/24/32-
bit input data and 20/24-bit output data.
FEATURES
Functions
s 8-times oversampling (interpolation)
s Switchable 8/4 times oversampling output
s Two master clock frequencies
(refer to Clock Functions)
• 384fs/512fs (normal-speed sampling)
• 192fs/256fs (high-speed sampling)
s Digital deemphasis
• Compatible with 32/44.1/48 kHz (normal-
speed) and 64/88.2/96 kHz (high-speed) input
sampling frequencies
• ON/OFF control
s Digital attenuator
• 128-step attenuation using linear 7-bit data set-
ting
s Soft muting
• 1016/fs (normal-speed sampling)
• 2032/fs (high-speed sampling)
s Output data round-off operation (normal round-off
or rectangular distribution dither round-off)
s Selectable LR clock polarity
s Microprocessor controllable
s Input data format
• 2s complement, MSB first, alternating L/R
serial
• 16/20/24/32-bit data selectable
s Output data format
• 2s complement, MSB first, simultaneous L/R
serial
• 20/24-bit data selectable.
s 24-bit internal data processing
s Jitter-free mode/synchronous mode selectable
s Crystal oscillator circuit built-in
s TTL-compatible outputs
s Molybdenum-gate CMOS
Filter Construction
s Interpolation filter (linear 3-stage FIR filter)
• Normal-speed sampling mode
1st stage (fs to 2fs) 121st order
2nd stage (2fs to 4fs) 21st order
3rd stage (4fs to 8fs) 13th order
• High-speed sampling mode:
1st stage (fs to 2fs) 177th order
2nd stage (2fs to 4fs) 29th order
3rd stage (4fs to 8fs) 17th order
s Deemphasis filter (IIR filter)
s Arithmetic units
• 25× 24-bit parallel adder
• 32-bit accumulator
s Overflow limiter built-in
Applications
s Digital audio equipment
PINOUT (TOP VIEW)
DIN 1
BCKI 2
VDD1 3
DITH 4
CKEN 5
XTI 6
XTO 7
VSS1 8
CKO 9
CKS 10
ASEL2/MDCK 11
HS/MDT 12
SYNC/MDLE 13
RST 14
28 LRCI
27 MDS
26 BCKO
25 WCKO
24 DOL
23 DOR
22 VDD2
21 VSS2
20 ASEL1
19 OBS
18 TEST2
17 TEST1
16 DEEM
15 LRS
ORDERING INFOMATION
Device
SM5846AP
Package
28pin DIP
Audio
ICs
NIPPON PRECISION CIRCUITS—1