SM6453AB
3-wire Serial Data Volume Control for Headphone Amplifier IC
OVERVIEW
The SM6453AB is a stereo headphone amplifier IC with built-in electronic volume controlled by 3-wire serial
data. Two switchable input systems are supported. It features bass boost function, automatic gain control
(AGC) function, power-down function, and beep sound input/output function, making it ideal for use in porta-
ble electronic products.
FEATURES
I
I
PINOUT
(Top view)
I
I
I
I
I
I
I
I
I
I
I
2 stereo system inputs, selectable 1 output system
Headphone amplifier function
• +12dB to -68dB output voltage gain range
(G
CNT
)
• +12dB headphone amplifier gain (G
HPA
)
Attenuation function
• 1.0dB step width, 81 steps, 0 to –80dB range
(G
EVR
)
Mute function
Bass boost function (2 boost characteristics con-
trolled by external RC network)
Auto gain control function (AGC)
Beep sound input/output circuit
26mW+26mW maximum output power
(1kHz, THD + N = 10%, 16
Ω
load, 2.0V supply
voltage)
Power-down function
1.8 to 3.6V operating supply voltage range
Low current consumption
(2.3mA total, 2.4V supply voltage)
Silicon-gate CMOS process
32-pin QFN package
DVDD1
DVDD2
DVSS
LRMXO
AGCTC
BSTC
BSTN
MLEN
MCK
MDT
RSTN
MUTEN
PDN
BEEPI
VREF1
VREF2
1
2
3
4
5
6
7
8
9
32 31 30 29 28 27 26
25
24
23
22
21
20
19
18
17
10 11 12 13 14 15 16
BSTO
BEEPLO
LOUT
AVSS2
AVDD2
AVDD3
AVSS3
ROUT
BEEPRO
PACKAGE DIMENSIONS
(Unit: mm)
ORDERING INFORMATION
Device
SM6453AB
Package
5.00 ± 0.05
5.20 ± 0.1
(Top view)
6.00 ± 0.05
−
C0
AVDD1
LIN1
LIN2
AVSS1
RIN1
RIN2
VBIAS
(Bottom view)
.2
0
6.20 ± 0.1
3
3.22TYP
32
1.00
0.50
32-pin QFN
2.68TYP
.7
0
1
0.22 ± 0.05
0.50
1.00
0.90 ± 0.05
0.60 ± 0.10
C0
0.05
0.22 ± 0.05
0.05
M
NIPPON PRECISION CIRCUITS INC.—1
0.005MIN
0.02TYP
0.04MAX
0.60 ± 0.10
NPC [ NIPPON PRECISION CIRCUITS INC ]
