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| SM6453AB_02 Datasheet, PDF (1/19 Pages) Nippon Precision Circuits Inc – 3-wire Serial Data Volume Control for Headphone Amplifier IC | |||
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SM6453AB
3-wire Serial Data Volume Control for Headphone Ampliï¬er IC
OVERVIEW
The SM6453AB is a stereo headphone ampliï¬er 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 2 stereo system inputs, selectable 1 output system
I Headphone ampliï¬er function
⢠+12dB to -68dB output voltage gain range
(GCNT)
⢠+12dB headphone ampliï¬er gain (GHPA)
I Attenuation function
⢠1.0dB step width, 81 steps, 0 to â80dB range
(GEVR)
I Mute function
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 26mW+26mW maximum output power
(1kHz, THD + N = 10%, 16⦠load, 2.0V supply
voltage)
I Power-down function
I 1.8 to 3.6V operating supply voltage range
I Low current consumption
(2.3mA total, 2.4V supply voltage)
I Silicon-gate CMOS process
I 32-pin QFN package
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)
ORDERING INFORMATION
Device
SM6453AB
Package
32-pin QFN
(Top view)
6.20 ± 0.1
6.00 ± 0.05
(Bottom view)
3.22TYP
1
0.50 1.00
0.22 ± 0.05
0.05
0.05 M
0.60 ± 0.10
NIPPON PRECISION CIRCUITS INC.â1
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