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PDF SM5852DS Data sheet ( Hoja de datos )
| Número de pieza | SM5852DS | |
| Descripción | Digital Audio Processor LSI | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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NIPPON PRECISION CIRCUITS INC.
SM5852DS
Digital Audio Processor LSI
OVERVIEW
The SM5852DS is a digital signal processor IC that
performs XBS (extra bass system), LIVE (pseudo-
sound field) and ASC (train position) processing for
use in digital audio reproduction equipment. It is
designed for use with a 44.1 kHz sampling
frequency.
FEATURES
s 2-channel processing
s XBS/LIVE functions
s XBS/LIVE processing bypass mode
s ASC function ON/OFF switching
s Input-level dependent dynamic gain characteris-
tics
s Serial input/output interface
2s complement, MSB first, 16-bit
s 384fs system clock
s 23 × 23-bit multiplier/30-bit high-precision
accumulator
s TTL-compatible input/output
s 3.2 to 5.5 V operating voltage range
s 16-pin SOP
s Molybdenum-gate CMOS
ORDERING INFOMATION
PINOUT
LRCI 1
BCKI 2
DI 3
CLK 4
VSS 5
RSTN 6
TESTN 7
MUTEN 8
16 DB/DS
15 MOD2
14 MOD1
13 OPT
12 VDD
11 LRCO
10 BCKO
9 DOUT
PACKAGE DIMENSIONS
16-pin SOP (Unit: mm)
0.17±0.05
Device
SM5852DS
Package
16pin SOP
10.16±0.3
10.5 MAX
0 to 15
0.635±0.15
1.27±0.15
0.4±0.15
NIPPON PRECISION CIRCUITS—1
1 page  
SM5852DS
AC Characteristics
Standard voltage: VDD = 4.5 to 5.5 V, VSS = 0 V, Ta = −20 to 80 °C
Low voltage: VDD = 3.2 to 4.5 V, VSS = 0 V, Ta = −20 to 70 °C
CLK (384fs)
Parameter
Clock pulsewidth
Clock cycle time
Symbol
tCW
tCY
Condition
min
24
55
Rating
typ
–
59
max
500
1000
Unit
ns
ns
CLK
RSTN
Parameter
Reset LOW-level pulsewidth
tcy
tCW tCW
VIH
1.5VDD
VIL
Symbol
Condition
At power-ON
tRST
At all other times
Rating
min typ max
1––
50 – 1000
Unit
µs
ns
VDD
3.2V
tRST 1µsec
RSTN
tRST
1.5V
RSTN should be set LOW at power-ON and after
reacquiring synchronization. Note that if RSTN is
LOW for longer than 1 µs, a through-current flows in
the internal dynamic circuits because the internal
clock is stopped. The through-current has no rated
value, so the reset pulse should be kept as short as
possible at all times other than at power-ON.
NIPPON PRECISION CIRCUITS—5
5 Page 
FUNCTIONAL DESCRIPTION
Signal Flow
SM5852DS
Lch. IN
ASC
Rch. IN
ASC
LIVE
Soft Mute
Lch. OUT
XBS
Soft Mute
Rch. OUT
ASC Function
The ASC (train position) function uses a 7 kHz band-
limited filter to cut-off sound leakage from
headphones. The ASC function is OFF when OPT is
HIGH, and ON when OPT is LOW.
LIVE Function
The LIVE (pseudo-sound field) function emphasizes
the extent of the sound field by adding an inverse
phase component from the opposite channel of the
input signal. When used with the XBS function, low-
frequency components of the spectrum are further
emphasized.
The LIVE function is OFF when DB/DS is HIGH,
and ON when DB/DS is LOW. Note that the function
is also OFF when both MOD1 and MOD2 are HIGH.
XBS Function
The XBS (extra bass system) function emphasizes
the low-frequency end of the spectrum by changing
the gain for low-frequency components of the input
signal. The XBS gain is set by the states of MOD1
and MOD2. Note that the gain changes when the
XBS function is used together with the LIVE
function.
DB/DS
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
MOD1
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
MOD2
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
Maximum gain
+13 dB
0 dB
+4 dB
0 dB
+10 dB
+13 dB
+6 dB
0 dB
Mode
XBS + LIVE
LIVE
XBS + LIVE
Off
XBS
XBS
XBS
Off
Soft Muting
Soft muting is active when MUTEN is LOW. When
MUTEN is LOW, the attenuation changes smoothly
from 0 to −∞ dB in 1024/fs, or approximately 23.2
ms.
When MUTEN goes HIGH, soft muting is released
and the attenuation changes smoothly from −∞ to 0
dB, again taking approximately 23.2 ms.
Also, if a MUTEN transition occurs while the
attenuation is changing, the attenuation then changes
smoothly in the direction specified by the new level
of MUTEN.
DB/DS, OPT Switching Shock Noise
The soft muting function is also activated to
eliminate switching shock noise when DB/DS or
OPT change state. When DB/DS or OPT change
state, the attenuation changes to −∞ dB, the internal
circuit settings are activated and then soft muting is
released. Therefore, a maximum time of
approximately 46.4 ms is required to change the
compression mode. Of course, if the attenuation is
already −∞ dB after soft muting using MUTEN, then
no time is required to change compression mode.
Reset Initialization
RSTN should be set LOW at power-ON and after
reacquiring synchronization. Note that if RSTN is
LOW for longer than 1 µs, a through-current flows in
the LSI’s internal dynamic circuits because the
internal clock is stopped. The through-current has no
rated value, so the reset pulse should be kept as short
as possible at all times other than at power-ON.
When RSTN goes from LOW to HIGH, initialization
hold is released and the initialization routine first
resets the internal data over an interval of 4fs. During
the initialization routine, the output data is forcibly
muted so that there is no output signal.
NIPPON PRECISION CIRCUITS—11
11 Page | ||
| Páginas | Total 14 Páginas | |
| PDF Descargar | [ Datasheet SM5852DS.PDF ] | |
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