SM6451B
Audio Variable Volume IC
OVERVIEW
The SM6451B 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
SM6451B devices to be connected and individually controlled over the 3-wire control interface from a single
CPU. It is available in 16-pin TSSOP packages.
FEATURES
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PINOUT
(Top view)
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Stereo inputs and outputs
Attenuation function
• 2-channel independent control
• 1.0dB/step over 80 steps
• 0 to
−
80dB range
Mute function
3-wire serial data control (MDT, MCK, MLEN)
Chip addressing (up to 4 devices can be connected
in parallel)
Low noise
• 0.003% THD + noise
• 12
µ
Vrms residual noise
2.5 to 3.6V single power supply
Silicon-gate CMOS process
Package: 16-pin TSSOP (Pb free)
RSTN
ADRS1
ADRS2
DVDD
LOUT
LIN
AVDD
VRL
1
16
MDT
MCK
MLEN
DVSS
ROUT
RIN
AVSS
8
9
VRR
APPLICATIONS
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PACKAGE DIMENSIONS
(Unit: mm)
Weight: 0.07g
Audio equipment
ORDERING INFORMATION
Device
SM6451BT
Package
16-pin TSSOP
4.40 ± 0.1
6.40 ± 0.2
0.44TYP
1.00TYP
0 to 8
0.225TYP
0.65
0.08
+ 0.08
0.22
−
0.07
0.50 ± 0.10
5.20MAX
5.00 ± 0.08
0.17 ± 0.05
+ 0.03
0.07
−
0.04
0.13 M
NIPPON PRECISION CIRCUITS INC.—1
+ 0.03
1.07
−
0.07
1.00 ± 0.05
NPC [ NIPPON PRECISION CIRCUITS INC ]
