Datasheet

MAX9791/MAX9792
Windows Vista-Compliant Class D Speaker
Amplifiers with DirectDrive Headphone Amplifiers
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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 the MAX9791A/MAX9791B with two 1µF ceramic low ESR capacitors to GND.
Bypass the MAX9791C with two 2µs 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 Headphone Amplifier Negative Power Supply. Connect a 1µF capacitor between CPVSS and PGND.
13 C1N Charge-Pump Flying Capacitor Negative Terminal. Connect a 1µF capacitor between C1P and C1N.
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 Headphone Amplifier Positive Power Supply. Connect a 10µF capacitor between HPVDD and PGND.
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.