Datasheet
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
28 ______________________________________________________________________________________
MAX9791A
MAX9791B
LDO_EN
8
HP_INL
3
HP_INR
2
LDO_OUT
6
HP_EN 22
BEEP 21
SPKR_EN
27
STEREO
CLASS D
AMPLIFIER
CONTROL
CHARGE
PUMP
LDO BLOCK
TO HPVDD
TO CPVSS
1
19 OUTL+
OUTL-
OUTR+
OUTR-
HPL
HPR
HPVDD
C1P
C1N
CPGND
18
24
25
10
9
16
15
14
13
12
CPVSS
C2
1.0µF
20, 23
PGNDGND
5
SPKR_INL
SPKR_INR
28
1.0µF
1.0µF
2.7V TO 5.5V
2.7V TO 5.5V
TO CODEC
NOTE: LOGIC PINS CONFIGURED FOR:
LDO_EN = 1, LDO ENABLED
SPKR_EN = 0, SPEAKER AMPLIFIERS ENABLED
HP_EN = 1, HEADPHONE AMPLIFIER ENABLED
C1
1.0µF
0.1µF
PVDD
17, 26
2.7V TO 5.5V
AVDD
7
0.1µF
1.0µF1.0µF
10µF
C3
10µF
R
IN3
RIN1
C
IN3
C
IN1
RIN1
CIN1
R
IN3
C
IN3
R
IN2
C
IN2
R
IN2
C
IN2
11
SENSE
40.2kΩ
40.2kΩ
40.2kΩ
TO HPVDD
20kΩ
20kΩ
4
C
COM
R
COM
µC BEEP INPUT
COM
MAX9791A/MAX9791B Block Diagram