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SM6451AVNIPPON

Audio Variable Volume IC

Nippon Precision Circuits  

NIPPON PRECISION CIRCUITS INC.

SM6451AV

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.

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

• ≤ 0.002% THD + noise

• 10 µVrms residual noise

s 5 V single power supply

s Silicon-gate CMOS process

PINOUT

(Top View)

RSTN 1

ADRS1

ADRS2

DVDD

LOUT

LIN

AVDD

VRL 8

16 MDT

MCK

MLEN

DVSS

ROUT

RIN

AVSS

9 VRR

PACKAGE DIMENSIONS

(Unit: mm)

16 pin VSOP

APPLICATIONS

s Audio equipment

ORDERING INFORMATION

Device

SM6451AV

Package

16-pin VSOP

0.275TYP

5.1 0.2

0.65

0.10

+ 0.10

0.22 - 0.05 0.12 M

0.15+-00..105

0 10

0.5 0.2

NIPPON PRECISION CIRCUITS—1

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