General Description
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.
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 4
Ω
speakers and 180mW into a 32
Ω
headphone load.
Features
♦
No DC-Blocking Output Capacitors Required at
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
Evaluates: MAX9791A
MAX9791A Evaluation Kit
________________________________________________________________
Maxim Integrated Products
1
19-4315; Rev 0; 10/08
Component List
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.
Ordering Information
DESIGNATION
QTY
DESCRIPTION
REQUIRED COMPONENTS
C1, C2, C5, C6,
C25–C28
8
1μF ±10%, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
C3, C4, C29
3
1μF ±10%, 50V X7R ceramic
capacitors (0805)
Murata GRM21BR71H105K
C7, C8, C9
3
0.1μF ±10%, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
C10, C30, C31
3
10μF ±10%, 10V X7R ceramic
capacitors (0805)
Murata GRM21BR71A106K
R1, R2
2
20k
±1% resistors (0603)
R3, R4, R13
3
40.2k
±1% resistors (0603)
U1 1
Speaker and headphone amplifier
with LDO (28 TQFN-EP*)
Maxim MAX9
—
1
PCB: MAX9791A Evaluation Kit+
DESIGNATION
QTY
DESCRIPTION
OPTIONAL COMPONENTS
AVDD, HPVDD,
PGND,
,
SPOUTL-,
,
SPOUTR-
7 Binding
posts
C11–C24, C32,
C33
0
Not installed, ceramic capacitors
(0603)
HPL, HPR,
PGND, SENSE,
SPOL+, SPOL-,
SPOR+, SPOR-
0
Not installed, small PCB test
points
HPINL, SPINL
2
White side-entry phono jacks
HPINR, SPINR
2
Red side-entry phono jacks
HPOUT 1
3.5mm
stereo
headphone
jack
JU1, JU2, JU3
3
3-pin headers
JU4, JU6
2
2-pin headers
JU5
0
Not installed, 2-pin header
L1–L4 0
Not installed, inductors (6.4mm x
6mm x 1.5mm)
R5–R8 4
0
±5% resistors (0805)
R9–R12,
R14, R15
0
Not installed, resistors (0603)
R16
0
Not installed, resistor (0805)
— 5
Shunts
(JU1–JU5)
PART
TYPE
MAX979 EV
Kit
+
Denotes lead-free and RoHS compliant.
*
EP = Exposed pad.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
