Rainbow Electronics MAX9729 - 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