Functional diagram/typical operating circuit – Rainbow Electronics MAX9729 User Manual
Page 24
MAX9729
Stereo Headphone Amplifier with BassMax,
Volume Control, and Input Mux
24
______________________________________________________________________________________
0 TO 100dB
ATTENUA
TOR
I
2
C INTERF
ACE/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
47k
Ω
R
BASS-BOOST CIRCUIT CONFIGURED FOR A
V_BOOST
= +8.8dB, f
POLE
= 38Hz, f
ZERO
= 106Hz.
() USCP P
ACKAGE
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
25k
Ω
25k
Ω
25k
Ω
25k
Ω
28
INR1
INR2
INR3
1
2
C
IN
1μ
F
LEFT AUDIO
INPUT 1
LEFT AUDIO
INPUT 2
LEFT AUDIO
INPUT 3
24
14
ADD
5
BEEP ENABLE
BEEP
ENABLE
BassMax
ENABLE
C
IN
1μ
F
C
IN
1μ
F
C
IN
1μ
F
C
IN
1μ
F
C
IN
1μ
F
V
DD
C
IN
1μ
F
C2
1μ
F
SVSS
10k
Ω
10k
Ω
R
V
DD
SV
SS
V
DD
SV
SS
OUTL
V
DD
C3
1μ
F
C1
1μ
F
R2
22k
Ω
R2
22k
Ω
R1
47k
Ω
C6
0.1
μ
F
C6
0.1
μ
F
V
DD
SV
SS
1μ
F
25k
Ω
25k
Ω
25k
Ω
MAX9729
V
DD
SHDN
P
VDD
Functional Diagram/Typical Operating Circuit