NPC SM6453AB Datasheet

preliminary

SM6453AB

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 vol­ume 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

■

2 stereo system inputs, 1 output system

■

12mW + 12mW output (standard, 16 Ω load, 2.0V

PINOUT

(Top view)

supply voltage)

■

Attenuation function

• 1.0dB step width

• 80-step

• + 12 to – 68dB variable range

■

Mute function

■

Low current consumption (2.3mA total, 2.4V sup­ply voltage)

■

12dB voltage gain

■

Bass boost function (2 boost characteristics con­trolled by external RC network)

■

Auto gain control function (AGC)

■

Beep sound input/output circuit

■

Power-down function

■

1.9 to 3.6V operating supply voltage range

■

Silicon-gate CMOS process

MLEN

MCK
MDT

RSTN

MUTEN

PDN

BEEPI
VREF1
VREF2

1

2

3

4

5

6

7

8

9

10

DVDD1

11

AVDD1

DVSS

DVDD2

1312

LIN2

LIN1

AGCTC

LRMXO

BSTC

2829303132 2627

RIN2

RIN1

AVSS1

BSTN

25

24

23

22

21

20

19

18

17

161514

VBIAS

BSTO
BEEPLO
LOUT
AVSS2
AVDD2
AVDD3
AVSS3
ROUT
BEEPRO

PACKAGE DIMENSIONS

ORDERING INFORMATION

(Unit: mm)

Device Package

SM6453AB 32-pin QFN

32-pin QFN

TBD

NIPPON PRECISION CIRCUITS—1

preliminary

=

=

=

PIN DESCRIPTION

−

−

−

−

−

−

−

−

−

SM6453AB

Number Name I/O

1 MLEN Ip Microcontroller latch enable input

2 MCK Ip Microcontroller clock input

3 MDT Ip Microcontroller data input

4 RSTN Ip System reset (LOW-level reset)

5 MUTEN I Mute input (LOW-level mute)

6 PDN I Power-down mode select (LOW-level power-down)

7 BEEPI I Beep signal input

8 VREF1 O Reference voltage 1

9 VREF2 O Reference voltage 2

10 AVDD1

11 LIN1 I Left-channel analog input 1

12 LIN2 I Left-channel analog input 2

13 AVSS1

14 RIN1 I Right-channel analog input 1

15 RIN2 I Right-channel analog input 2

16 VBIAS O EVR-stage bias voltage

17 BEEPRO O Right-channel beep signal output

18 ROUT O Right-channel output

19 AVSS3

20 AVDD3

21 AVDD2

22 AVSS2

23 LOUT O Left-channel output

24 BEEPLO O Left-channel beep signal output

25 BSTO O Bass boost auxiliary output

26 BSTN I Bass boost auxiliary input

27 BSTC O Bass boost capacitor connection

28 AGCTC O AGC time constant capacitor connection

29 LRMXO O Left + right-channel mix detector output

30 DVSS

31 DVDD2

32 DVDD1

1. Ip = input with pull-up

1

EVR-stage analog V

EVR-stage analog V

Headphone amplifier right-channel analog V

Headphone amplifier right-channel analog V

Headphone amplifier left-channel analog V

Headphone amplifier left-channel analog V

Digital V

SS

Digital V

DD2

Digital V

DD1

DD

SS

Description V

SS

DD

DD

SS

DD

V

DD2

V

DD1

V

DD2

V

, V

, V

DD1

V

DD1

V

DD2

V

DVSS = AVSS1 = AVSS2 = AVSS3

SS

definition:

DD2

SS

DVDD2 = AVDD1 = AVDD2 = AVDD3
DVDD1

NIPPON PRECISION CIRCUITS—2

preliminary

BLOCK DIAGRAM

MLEN

MCK

SM6453AB

VREF1

VDD1

+

1µF

DVDD1

DVDD231DVSS30LRMXO29AGCTC28BSTC27BSTN

32

1

2

AGC

0.1µF

22µF

26

BSTO

25

BST

BEEPLO

24

VDD2

VDD2

MDT

RSTN

MUTEN

PDN

BEEPI

VREF1

VREF2

3

4

5

6

7

8

9

AVDD1

10µF

10µF

Level Shifter

+

+

Interface

Microcontroller

40kΩ

40kΩ

EVR

EVR

VREF1

VREF2

10 11 12 13 14 15 16

LIN1

10µF

VDD1

LIN2

10µF

+

10µF

Selector

AVSS1

RIN1

220µF 16Ω

LOUT

HPA

1.6kΩ

1.6kΩ

HPA

BEEP

RIN2

10µF

10µF

+

10µF

23

22

21

20

19

18

17

VBIAS

AVSS2

AVDD2

AVDD3

AVSS3

ROUT

BEEPRO

+

0.47µF

220µF

+

+

220µF

0.47µF

+

220µF 16Ω

10Ω

VDD1

VDD1

10Ω

NIPPON PRECISION CIRCUITS—3

preliminary

SPECIFICATIONS

Absolute Maximum Ratings

Parameter Symbol Rating Unit

V

, V

DD1

Supply voltage

Digital system input voltage V

Analog system input voltage V

Storage temperature T

Recommended Operating Conditions

V

DVSS = AVSS1 = AVSS2 = AVSS3 = 0V, V

SS

V

DD2

DVDD1

V

DD2

SS

IND

INA

STG

=

=

=

SM6453AB

0.3 to 4.6 V

0V

DVSS − 0.3 to V

AVSS − 0.3 to V

55 to 125

DD1

0.3 V

DD1

0.3 V

DD2

DVDD2 = AVDD1 = AVDD2 = AVDD3,

−

+

+

−

° C

−

°

Parameter Symbol Conditions Unit

Supply voltage 1 V

Supply voltage 2 V

Operating temperature T

Voltages between DVDD2, AVDD1, AVDD2, AVDD3 should be less ± 0.1V.

DD1

DD2

OPR

1.9 to 3.6 V

1.9 to 3.6 V

40 to 85

C

NIPPON PRECISION CIRCUITS—4