SM6453AB Datasheet, PDF (1/12 Pages) Nippon Precision Circuits Inc – 3-wire Serial Data Volume Control for Headphone Amplifiers IC

NIPPON PRECISION CIRCUITS INC.
SM6453AB
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, 16Ω 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
Device
SM6453AB
Package
32-pin QFN
PINOUT
(Top view)
MLEN
MCK
MDT
RSTN
MUTEN
PDN
BEEPI
VREF1
VREF2
32 31 30 29 28 27 26
1
25
2
24
3
23
4
22
5
21
6
20
7
19
8
18
9
17
10 11 12 13 14 15 16
BSTO
BEEPLO
LOUT
AVSS2
AVDD2
AVDD3
AVSS3
ROUT
BEEPRO
PACKAGE DIMENSIONS
(Unit: mm)
32-pin QFN
TBD
NIPPON PRECISION CIRCUITS—1