19-4315; Rev 0; 10/08
MAX9791A Evaluation Kit
Evluates:MX791A
General Description
Features
♦ No DC-Blocking Output Capacitors Required at
The MAX9791A evaluation kit (EV kit) demonstrates the
MAX9791A IC, which combines a stereo Class D power
amplifier, a DirectDrive® stereo headphone amplifier,
and a 120mA, 4.75V low-dropout regulator (LDO) for
notebook, tablet PC, and portable media player appli-
cations. Maxim’s DirectDrive technology eliminates the
need for bulky DC-blocking capacitors at the output of
the headphone amplifier.
Headphone Output
♦ Speaker and Headphone Operation
Speaker: 2W Stereo Output
Headphone: 180mW DirectDrive Stereo Output
♦ Wake-on-Beep Function
♦ 120mA, 4.75V LDO
♦ Lead-Free and RoHS Compliant
♦ Fully Assembled and Tested
The EV kit is configured for a 12dB speaker amplifier
gain and a 0dB headphone amplifier gain. It is designed
to operate from a 4.5V to 5.5V speaker supply and an
optional separate 2.7V to 5.5V headphone supply. The
EV kit is capable of delivering up to 2W into a pair of 4Ω
speakers and 180mW into a 32Ω headphone load.
Ordering Information
PART
TYPE
MAX9791AEVKIT+
EV Kit
+Denotes lead-free and RoHS compliant.
Component List
DESIGNATION
QTY
DESCRIPTION
DESIGNATION
QTY
DESCRIPTION
OPTIONAL COMPONENTS
REQUIRED COMPONENTS
1μF 10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
AVDD, HPVDD,
PGND,
SPOUTL+,
SPOUTL-,
SPOUTR+,
SPOUTR-
C1, C2, C5, C6,
C25–C28
8
3
3
3
7
Binding posts
1μF 10%, 50V X7R ceramic
capacitors (0805)
Murata GRM21BR71H105K
C3, C4, C29
C7, C8, C9
0.1μF 10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
C11–C24, C32,
C33
Not installed, ceramic capacitors
(0603)
0
0
HPL, HPR,
10μF 10%, 10V X7R ceramic
capacitors (0805)
Murata GRM21BR71A106K
PGND, SENSE,
SPOL+, SPOL-,
SPOR+, SPOR-
Not installed, small PCB test
points
C10, C30, C31
R1, R2
2
3
20kꢀ 1% resistors (0603)
40.2kꢀ 1% resistors (0603)
HPINL, SPINL
HPINR, SPINR
HPOUT
2
2
1
3
2
0
White side-entry phono jacks
Red side-entry phono jacks
3.5mm stereo headphone jack
3-pin headers
R3, R4, R13
Speaker and headphone amplifier
with LDO (28 TQFN-EP*)
Maxim MAX9791AETI+
U1
—
1
1
JU1, JU2, JU3
JU4, JU6
2-pin headers
PCB: MAX9791A Evaluation Kit+
JU5
Not installed, 2-pin header
Not installed, inductors (6.4mm x
6mm x 1.5mm)
L1–L4
R5–R8
0
4
0
0ꢀ 5% resistors (0805)
R9–R12,
R14, R15
Not installed, resistors (0603)
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
R16
0
5
Not installed, resistor (0805)
Shunts (JU1–JU5)
—
*EP = Exposed pad.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim Direct at 1-888-629-4642,
or visit Maxim’s website at www.maxim-ic.com.