Max9791 pin description – Rainbow Electronics MAX9792 User Manual
Page 16
MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
16
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MAX9791 Pin Description
PIN
NAME
FUNCTION
1
SPKR_INL
Left-Channel Speaker Amplifier Input
2
HP_INR
Right-Channel Headphone Amplifier Input
3
HP_INL
Left-Channel Headphone Amplifier Input
4
COM
Common-Mode Voltage Sense Input
5
GND
Signal Ground. Star connect to PGND.
6
LDO_OUT
LDO Output. Bypass with two 1µF ceramic low ESR capacitors to GND.
7
AVDD
Positive Power-Supply and LDO Input. Bypass with a 0.1µF and two 1µF capacitors to GND.
8
LDO_EN
LDO Enable. Connect LDO_EN to AVDD to enable the LDO.
9
HPR
Right-Channel Headphone Amplifier Output
10
HPL
Left-Channel Headphone Amplifier Output
11
SENSE
Headphone Ground Sense
12
CPVSS
H ead p hone Am p l i fi er N eg ati ve P ow er S up p l y. C onnect a 1µF cap aci tor b etw een C P V S S and P G N D .
13
C1N
C har g e- P um p Fl yi ng C ap aci tor N eg ati ve Ter m i nal . C onnect a 1µF cap aci tor b etw een C 1P and C 1N .
14
CPGND
Charge-Pump Ground. Connect directly to PGND plane.
15
C1P
Charge-Pump Flying Capacitor Positive Terminal. Connect a 1µF capacitor between C1P and C1N.
16
HPVDD
H ead p hone Am p l i fi er P osi ti ve P ow er S up p l y. C onnect a 10µF cap aci tor b etw een H P V D D and P GN D .
17, 26
PVDD
Speaker Amplifier Power-Supply Input. Bypass with a 0.1µF capacitor to PGND.
18
OUTL-
Left-Channel Speaker Amplifier Output, Negative Phase
19
OUTL+
Left-Channel Speaker Amplifier Output, Positive Phase
20, 23
PGND
Power Ground. Star connect to GND.
21
BEEP
PC Beep Input. Connect to GND if beep detection function is disabled.
22
HP_EN
Active-High Headphone Amplifier Enable
24
OUTR+
Right-Channel Speaker Amplifier Output, Positive Phase
25
OUTR-
Right-Channel Speaker Amplifier Output, Negative Phase
27
SPKR_EN
Active-Low Speaker Amplifier Enable
28
SPKR_INR
Right-Channel Speaker Amplifier Input
—
EP
Exposed Pad. Connect to GND.