Maxim MAX9791A Manual

19-4315; Rev 0; 10/08
General Description
The MAX9791A evaluation kit (EV kit) demonstrates the
MAX9791A IC, which combines a stereo Class D power
®
amplifier, a DirectDrive
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 4Ω
speakers and 180mW into a 32Ω headphone load.
DESIGNATION QTY
REQUIRED COMPONENTS
1μF ±10%, 10V X7R ceramic
C1, C2, C5, C6,
8 capacitors (0603)
C25–C28
Murata GRM188R71A105K
1μF ±10%, 50V X7R ceramic
C3, C4, C29 3 capacitors (0805)
Murata GRM21BR71H105K
0.1μF ±10%, 16V X7R ceramic
C7, C8, C9 3 capacitors (0603)
Murata GRM188R71C104K
10μF ±10%, 10V X7R ceramic
C10, C30, C31 3 capacitors (0805)
Murata GRM21BR71A106K
R1, R2 2 20k
R3, R4, R13 3 40.2k
Speaker and headphone amplifier
U1 1 with LDO (28 TQFN-EP*)
Maxim MAX9791AETI+
— 1 PCB: MAX9791A Evaluation Kit+
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
________________________________________________________________ Maxim Integrated Products
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.
stereo headphone amplifier,
DESCRIPTION
±1% resistors (0603)
±1% resistors (0603)
MAX9791A Evaluation Kit
♦ 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
PART
MAX9791AEVKIT+
+ Denotes lead-free and RoHS compliant.
DESIGNATION QTY
OPTIONAL COMPONENTS
AVDD, HPVDD,
PGND,
SPOUTL+,
SPOUTL-,
SPOUTR+,
SPOUTR-
C11–C24, C32,
C33
HPL, HPR,
PGND, SENSE,
SPOL+, SPOL-,
SPOR+, SPOR-
HPINL, SPINL
HPINR, SPINR
HPOUT
JU1, JU2, JU3
JU4, JU6
JU5
L1–L4
R5–R8
R9–R12,
R14, R15
R16
—
* EP = Exposed pad.
Features
Ordering Information
TYPE
EV Kit
Component List
DESCRIPTION
7 Binding posts
Not installed, ceramic capacitors
0
(0603)
Not installed, small PCB test
0
points
2 White side-entry phono jacks
2 Red side-entry phono jacks
1 3.5mm stereo headphone jack
3 3-pin headers
2 2-pin headers
0 Not installed, 2-pin header
Not installed, inductors (6.4mm x
0
6mm x 1.5mm)
4 0 ±5% resistors (0805)
0 Not installed, resistors (0603)
0 Not installed, resistor (0805)
5 Shunts (JU1–JU5)
1