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
MAX9751
1
(5)
C
1µF
4
(8)
IN
INL1
OUTL+
OUTL-
LEFT CHANNEL
AUDIO INPUT
BTL
AMPLIFIER
5
(9)
C
1µF
2
INPUT
MUX
IN
INL2 (6)
LEFT CHANNEL
AUDIO INPUT
27
(3)
C
1µF
18
(22)
IN
INR1
RIGHT CHANNEL
AUDIO INPUT
OUTR+
OUTR-
BTL
AMPLIFIER
INPUT
MUX
28
(4)
17
(21)
C
1µF
IN
INR2
RIGHT CHANNEL
AUDIO INPUT
21
(25)
BIAS
15
C
1µF
BIAS
(19)
HPV
HPS
DD
3V TO 5.5V
0.1µF
20
(24)
MUX AND
GAIN
CONTROL
24
(28)
GAIN
IN1/2
SHDN
V
V
DD
23
(27)
14
(18)
HPOUTL
HEADPHONE
DETECTION
DD
22
(26)
V
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
26
(2)
3, 19
(7, 23)
11 12
(15) (16)
CV
SS
V
SS
GND
PGND
C2
1µF
( ) TSSOP PIN.
LOGIC PINS CONFIGURED FOR:
GAIN = 1, 9dB SPEAKER GAIN/0dB HEADPHONE GAIN.
IN1/2 = 1, SELECTED INPUT LINE 1.
SHDN = 1, PART ACTIVE.
24 ______________________________________________________________________________________
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
