SM6451AV
NIPPON PRECISION CIRCUITS INC.
Audio Variable Volume IC
OVERVIEW
The SM6451AV is a 3-wire serial-controlled elec-
tronic variable volume IC for audio applications. It
provides electronic volume control for a stereo sys-
tem (left and right channels), and independent chan-
nel attenuation and muting, with greatly enhanced
digital zip noise suppression. The chip address func-
tion allows up to four SM6451AV devices to be con-
nected and individually controlled over the 3-wire
control interface from a single CPU. It is available in
16-pin VSOP packages.
PINOUT
(Top View)
RSTN
ADRS1
ADRS2
DVDD
LOUT
LIN
AVDD
VRL
1
16
MDT
MCK
MLEN
DVSS
ROUT
RIN
AVSS
6451AV
FEATURES
s
s
8
9
VRR
s
s
s
s
s
s
APPLICATIONS
s
4.4 0.2
6.4 0.2
Stereo inputs and outputs
Attenuation function
• 2-channel independent control
• 1.0 dB/step over 80 steps
• 0 to
−
80 dB range
Mute function
3-wire serial data control (MDT, MCK, MLEN)
Chip addressing (up to 4 devices can be connected
in parallel)
Low noise
•
≤
0.002% THD + noise
• 10 µVrms residual noise
5 V single power supply
Silicon-gate CMOS process
PACKAGE DIMENSIONS
(Unit: mm)
16 pin VSOP
Audio equipment
0.275TYP
5.1 0.2
0.15
-
+ 0.1 5
0.0
ORDERING INFORMATION
0 10
0.10
+ 0.10
0.22
- 0.05
SM6451AV
16-pin VSOP
0.10 0.05
1.15 0.1
Device
Package
0.65
0.12
M
0.5 0.2
NIPPON PRECISION CIRCUITS—1
NPC [ NIPPON PRECISION CIRCUITS INC ]
