Table of Contents
Advertisement
CIRCUIT DESCRIPTION
U404: Digital filter for CD players (SM5807ES)
General
e
2-channel filtering.
The SM5807ES
is a quadruple-oversampling digital filter for
e
Built-in overflow limiter.
CD players, developed using molybdenum-gate CMOS tech-
e
16-bit serial input/output (2°s complement,
MSB first).
nology. This LSI incorporates digital filters for both channels
©
Built-in X'tal oscillator circuit.
and outputs quadruple-oversampling signals for both channels,
e
XT terminal input clock buffer output.
thereby making it possible to simplify the analog filters in sub-
Structure
sequent stages.
¢
16-pin plastic SOP.
Features
Filter configuration
¢
TTL-compatible inputs/outputs.
e
Linear-phase FIR filter, in a 2-stage successive connection
©
Single power supply of 5 V+0.5 V.
(61-order + 13-order).
®
Serial inputs/outputs that allow the production of a com-
Filter Characteristics
pact system.
e
Pass band and ripple
O to 20 kHz: 0.05 cB or less
Functions
e
Stopping band and attenuation
*
Quadruple oversampling.
24.1 kHz or more: 45 dB or more
e
Linear phase (No group delay distortion).
Block Diagram
OGR
Coefficient
OGL
ROM
o
8
Ped
DOUT
input
2
Inter-face
|
Shift register
2
5
,
E
i
w0co
4
P]
G
2
°o
Shift register |
Po
y
BCKO
oO
LRCO
55
Advertisement
Table of Contents
