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PDF SM6451 Data sheet ( Hoja de datos )
| Número de pieza | SM6451 | |
| Descripción | Audio Variable Volume IC | |
| Fabricantes | Nippon Precision Circuits Inc | |
| Logotipo |  |
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Hay una vista previa y un enlace de descarga de SM6451 (archivo pdf) en la parte inferior de esta página. Total 12 Páginas | ||
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NIPPON PRECISION CIRCUITS INC.
SM6451BV
Audio Variable Volume IC
OVERVIEW
The SM6451BV is a 3-wire serial-controlled electronic variable volume IC for audio applications. It provides
electronic volume control for a stereo system (left and right channels), and independent channel attenuation
and muting, with greatly enhanced digital zip noise suppression. The chip address function allows up to four
SM6451BV devices to be connected and individually controlled over the 3-wire control interface from a single
CPU. It is available in 16-pin VSOP packages.
FEATURES
s Stereo inputs and outputs
s Attenuation function
• 2-channel independent control
• 1.0 dB/step over 80 steps
• 0 to −80 dB range
s Mute function
s 3-wire serial data control (MDT, MCK, MLEN)
s Chip addressing (up to 4 devices can be connected
in parallel)
s Low noise
• 0.003 % THD + noise
• 12 µVrms residual noise
s 2.5 to 3.6 V single power supply
s Silicon-gate CMOS process
PINOUT
(Top View)
RSTN
ADRS1
ADRS2
DVDD
LOUT
LIN
AVDD
VRL
1
8
16 MDT
MCK
MLEN
DVSS
ROUT
RIN
AVSS
9 VRR
APPLICATIONS
s Audio equipment
ORDERING INFORMATION
PACKAGE DIMENSIONS
(Unit: mm)
16 pin VSOP
Device
SM6451BV
Package
16-pin VSOP
0.275TYP
5.1 0.2
0.65
0.10
0.22+-
0.10
0.05
0.12 M
0.15+-00..105
0 10
0.5 0.2
NIPPON PRECISION CIRCUITS—1
1 page  
SM6451BV
AC Analog Characteristics
VDD = 3.0 V, 0.8 Vrms amplitude, 1 kHz input frequency, 100 kΩ output load resistance, Ta = 25 °C,
AC-coupled inputs
Analog inputs (LIN, RIN)
Parameter
Reference input amplitude
Input resistance
Input clipping voltage
Symbol
VAI
R IN
VCLP
Condition
THD + N = 1%, ATT = 0 dB
min
–
40
–
Rating
typ
0.8
50
1.1
max
–
60
–
Unit
Vrms
kΩ
Vrms
Analog outputs (LOUT, ROUT)
Parameter
Residual noise voltage
Signal-to-noise ratio
Total harmonic distortion + noise
Gain control range
Step size
Attenuation error (1k to 20kHz)
Absolute attenuation (1 kHz)
Mute attenuation (1 kHz)
Channel crosstalk
Frequency response
Quiescent output zip noise voltage
(while ATT value adjusting)
Minimum driver load resistance
Symbol
VNS
SNR
THD + N
RCNT
Step
ERR1
ERR2
AT 0
AT 2
AT 4
AT 6
AT 8
Mute
CT
FR
NJ
RML
Condition
Input signal: 0 Vrms,
A - weight filter, 0 dBr = 0.8
Vr m s , ATT = 0 dB
ATT = 0 dB, 20 kHz
lowpass filter
0 to −60 dB
−61 to −80 dB
ATT = 0 dB
ATT = −20 dB
ATT = −40 dB
ATT = −60 dB
ATT = −80 dB
ATT = Mute
ATT = 0 dB
ATT = 0 dB, f = 200 kHz
0 Vrms input
ATT = 0 dB, THD + N = 1%
min
–
92
–
– 80
0.8
–2
–6
–
–
–
–
–
– 85.0
– 103
– 10
–
–
Rating
typ
12
96
0.0025
–
1.0
–
–
– 0.0
– 20.0
– 40.0
– 60.4
– 84.2
– 88.0
– 105
–8
–
8
max
20
–
0.005
0
1.8
1
0
–
–
–
–
–
–
–
–
3
12
Unit
µVr m s
dBr
%
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
dB
mV
kΩ
Reference voltage (VRL, VRR)
Parameter
Reference voltage output
Symbol
VREF
Condition
min
0.45VDD
Rating
typ
0.5VDD
max
0.55VDD
Unit
V
NIPPON PRECISION CIRCUITS—5
5 Page 
SM6451BV
TYPICAL APPLICATIONS
Connection Guidelines
Decoupling capacitors of approximately 10 µF should be connected from AVDD, VRL, VRR to AVSS, and
from DVDD to DVSS.
In addition, approximately 0.01 µF capacitors should also be connected from AVDD, VRL, VRR to AVSS, and
from DVDD to DVSS to suppress digital switch noise.
An approximately 0.001 µF capacitor connected from RSTN to DVSS will force a system reset when power is
applied.
Connection 1 (to DAC)
CPU
DAC
MDT MCK MLEN
LPF LIN LOUT
LPF RIN ROUT
2.5 to 3.6V
SM6451
DVDD
DVSS
AVDD
ADRS1
AVSS
ADRS2
L-ch OUT
R-ch OUT
Connection 2
When there is a possibility that the input peak-to-peak amplitude will exceed the supply voltage, input protec-
tion diodes should be connected to prevent device breakdown.
L-ch Input
R-ch Input
AVDD
LIN LOUT
SM6451
RIN ROUT
AVSS
L-ch Output
R-ch Output
NIPPON PRECISION CIRCUITS—11
11 Page | ||
| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet SM6451.PDF ] | |
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