SM6451BV

NIPPON PRECISION CIRCUITS—1

NIPPON PRECISION CIRCUITS INC.

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

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Stereo inputs and outputs

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Attenuation function

• 2-channel independent control

• 1.0 dB/step over 80 steps

• 0 to

−80 dB range

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Mute function

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3-wire serial data control (MDT, MCK, MLEN)

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Chip addressing (up to 4 devices can be connected

in parallel)

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Low noise

• 0.003 % THD + noise

• 12

µVrms residual noise

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2.5 to 3.6 V single power supply

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Silicon-gate CMOS process

APPLICATIONS

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Audio equipment

ORDERING INFORMATION

PINOUT

(Top View)

PACKAGE DIMENSIONS

(Unit: mm)

16 pin VSOP

D e vice

P a ck ag e

SM6451BV

16-pin VSOP

1

9

16

8

RSTN

ADRS1

ADRS2

DVDD

LOUT

LIN

AVDD

MDT

MCK

MLEN

DVSS

ROUT

RIN

AVSS

VRL

VRR

5.1 0.2

0.22

+ 0.10

- 0.05

010

0.5 0.2

0.275TYP

0.65

0.10

0.15

+ 0.1

- 0.05