Owner manual

MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
24 ______________________________________________________________________________________
0 TO 100dB
ATTENUATOR
I
2
C INTERFACE/CONTROL LOGIC
1.8V TO 3.6V
CHARGE PUMP
SV
SS
PV
SS
PGND
SGND
C1P
C1N
SDA
SCL
OUTR
BMR
BML
23
11
10
9
6
7
21
12
3
16 17 18 19
TO I
2
C
MASTER
R1 47kΩ
R
BASS-BOOST CIRCUIT CONFIGURED FOR A
V_BOOST
= +8.8dB, f
POLE
= 38Hz, f
ZERO
= 106Hz.
() USCP PACKAGE
SV
SS
V
DD
V
DD
SV
SS
V
DD
R
R
V
DD
SV
SS
R
R
R
13
RIGHT AUDIO
INPUT 1
RIGHT AUDIO
INPUT 2
RIGHT AUDIO
INPUT 3
BEEP
BEEP INPUT
SGND
PGND
BEEP_EN
20
25
INL1
INL2
INL3
26
27
25kΩ 25kΩ 25kΩ
25kΩ
28
INR1 INR2 INR3
1 2
C
IN
1μF
LEFT AUDIO
INPUT 1
LEFT AUDIO
INPUT 2
LEFT AUDIO
INPUT 3
24
14
ADD
5
BEEP ENABLE
BEEP
ENABLE
BassMax ENABLE
C
IN
1μF
C
IN
1μF
C
IN
1μF
C
IN
1μF
C
IN
1μF
V
DD
C
IN
1μF
C2 1μF
SVSS
10kΩ 10kΩ
R
V
DD
SV
SS
V
DD
SV
SS
OUTL
V
DD
C3 1μF
C1 1μF
R2 22kΩ
R2 22kΩ
R1 47kΩ
C6 0.1μF
C6 0.1μF
V
DD
SV
SS
1μF
25kΩ 25kΩ 25kΩ
MAX9729
V
DD
SHDN
P
VDD
Functional Diagram/Typical Operating Circuit