SM5846AP_06 Datasheet, PDF(1/36 Page) Nippon Precision Circuits Inc

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SM5846AP_06 Datasheet, PDF (1/36 Pages) Nippon Precision Circuits Inc – Multi-function Digital Filter

SM5846AP

Multi-function Digital Filter

OVERVIEW

The SM5846AP is a multi-function digital ï¬lter that incorporates 4/8 times oversampling digital audio signal

reproduction, digital deemphasis, digital attenuation and soft mute functions. The I/O interface allows serial

data transmission of 16/20/24/32-bit input data and 20/24-bit output data.

FEATURES

Functions

I 8-times oversampling (interpolation)

I Switchable 8/4 times oversampling output

I Two master clock frequencies

(refer to Clock Functions)

â¢ 384fs/512fs (normal-speed sampling)

â¢ 192fs/256fs (high-speed sampling)

I Digital deemphasis

â¢ Compatible with 32/44.1/48kHz (normal-

speed) and 64/88.2/96kHz (high-speed) input

sampling frequencies

â¢ ON/OFF control

I Digital attenuator

â¢ 128-step attenuation using linear 7-bit data set-

ting

I Soft muting

â¢ 1016/fs (normal-speed sampling)

â¢ 2032/fs (high-speed sampling)

I Output data round-off operation (normal round-off

or rectangular distribution dither round-off)

I Selectable LR clock polarity

I Microprocessor controllable

I Input data format

â¢ 2s complement, MSB ï¬rst, alternating L/R

serial

â¢ 16/20/24/32-bit data selectable

I Output data format

â¢ 2s complement, MSB ï¬rst, simultaneous L/R

serial

â¢ 20/24-bit data selectable.

I 24-bit internal data processing

I Jitter-free mode/synchronous mode selectable

I Crystal oscillator circuit built-in

I TTL-compatible outputs

I Molybdenum-gate CMOS

Filter Construction

I Interpolation ï¬lter (linear 3-stage FIR ï¬lter)

â¢ 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

â¢ 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

I Deemphasis ï¬lter (IIR ï¬lter)

I Arithmetic units

â¢ 25Ã 24-bit parallel adder

â¢ 32-bit accumulator

I Overï¬ow limiter built-in

APPLICATIONS

I Digital audio equipment

ORDERING INFOMATION

Device

SM5846AP

Package

28-pin DIP

SEIKO NPC CORPORATION â1

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