SM6453AB

NIPPON PRECISION CIRCUITS—1

NIPPON PRECISION CIRCUITS INC.

3-wire Serial Data Volume Control for Headphone Amplifiers IC

OVERVIEW

The SM6453AB is a 3-wire serial data volume control for headphone amplifiers with built-in electronic vol-

ume control. Two switchable input systems are supported. It features bass boost function, auto gain control

function (AGC), power-down function, and beep input, making it ideal for use in portable electronic products.

FEATURES

I

2 stereo system inputs, 1 output system

I

12mW + 12mW output (standard, 16

Ω load, 2.0V

supply voltage)

I

Attenuation function

• 1.0dB step width

• 80-step

• + 12 to – 68dB variable range

I

Mute function

I

Low current consumption (2.3mA total, 2.4V sup-

ply voltage)

I

12dB voltage gain

I

Bass boost function (2 boost characteristics con-

trolled by external RC network)

I

Auto gain control function (AGC)

I

Beep sound input/output circuit

I

Power-down function

I

1.9 to 3.6V operating supply voltage range

I

Silicon-gate CMOS process

ORDERING INFORMATION

PINOUT

(Top view)

PACKAGE DIMENSIONS

(Unit: mm)

32-pin QFN

Device

Package

SM6453AB

32-pin QFN

1

2

3

4

5

13

12

11

10

16

15

14

28

29

30

31

32

26

27

MLEN

MCK

MDT

RSTN

MUTEN

6

7

8

25

24

23

22

21

20

19

18

PDN

BEEPI

VREF1

9

VREF2

BSTO

BEEPLO

LOUT

AVSS2

AVDD2

AVDD3

AVSS3

ROUT

17

BEEPRO

TBD