2.6W Stereo Audio Power Amplifiers and
DirectDrive Headphone Amplifiers
Block Diagrams (continued)
4.5V TO 5.5V
0.1µF
V
DD
25
(1)
6, 16
(10, 20)
PV
DD
4.5V TO 5.5V
0.1µF
MAX9755
4
(8)
C
1µF
2
OUTL+
OUTL-
IN
INL (6)
BTL
AMPLIFIER
5
(9)
LEFT CHANNEL
AUDIO INPUT
18
(22)
28
OUTR+
C
IN
(4)
1µF
INR
BTL
AMPLIFIER
RIGHT CHANNEL
AUDIO INPUT
17
(21) OUTR-
21
(25)
BIAS
15
C
1µF
BIAS
(19)
HPV
HPS
DD
3V TO 5.5V
0.1µF
20
(24)
GAIN
CONTROL
24
(28)
GAIN
V
V
DD
14
(18)
HEADPHONE
DETECTION
HPOUTL
22
(26)
SHDN
DD
SHUTDOWN
CONTROL
13
(17)
HPOUTR
7
CPV
(11)
DD
3V TO 5.5V
1µF
8
(12)
C1P
C1
1µF
10
(14)
CHARGE
PUMP
C1N
9
(13)
CPGND
23, 26
(2, 27)
3, 19
(7, 23)
11 12
(15) (16)
CPV
V
SS
GND
PGND
SS
C2
1µF
( ) TSSOP PIN.
LOGIC PINS CONFIGURED FOR:
GAIN = 1, 9dB SPEAKER GAIN/0dB HEADPHONE GAIN.
SHDN = 1, PART ACTIVE.
______________________________________________________________________________________ 25
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
