19-0591; Rev 1; 11/06
MAX9789A Evaluation Kit
General Description
Features
The MAX9789A evaluation kit (EV kit) is a fully assem-
bled and tested circuit board that evaluates the
MAX9789A IC. The MAX9789A combines a stereo 2W
Class AB speaker power amplifier, a stereo 85mW
DirectDrive™ headphone amplifier, and a 120mA low-
dropout (LDO) linear regulator in a single device. The
MAX9789A is designed for use with the Windows
Vista™ operating system and is fully compliant with
Microsoft’s premium mobile Vista specifications.
♦ Windows Premium Mobile Vista Compliant
♦ 2W Stereo Class AB BTL Speaker Amplifier
♦ Stereo 100mW DirectDrive Headphone Amplifier
♦ Integrated 120mA Low-Dropout Linear Regulator
♦ Fully Assembled and Tested
♦ Evaluates the MAX9790A (Replacement IC
The speaker amplifier operates from a 4.5V to 5.5V DC
power supply and delivers 2 x 2W output power into a
pair of 4Ω speakers. The headphone amplifier operates
from a 3.0V to 5.5V DC power supply and delivers
100mW output power into a 16Ω stereo headphone.
Required)
Ordering Information
The MAX9789A provides separate stereo speaker and
headphone amplifier inputs. Control pins provide inde-
pendent shutdown of the speaker and headphone
amplifiers, allowing speaker and headphone amplifiers
to reproduce separate audio streams simultaneously.
PART
TEMP RANGE
IC PACKAGE
MAX9789AEVKIT+
0°C to +70°C*
32 TQFN-EP**
*This limited temperature range is for the EV kit PC board only.
The MAX9789A IC temperature range is -40°C to +85°C.
The MAX9789A features an internal 120mA LDO. The
LDO output voltage is internally set at 4.75V, or can be
externally adjusted between 1.21V and 4.75V using a
simple resistor-divider. The LDO can be enabled inde-
pendently of the audio amplifiers.
**EP = Exposed paddle.
+Denotes a lead-free and RoHS-compliant EV kit.
The MAX9789A EV kit can be used to evaluate the
MAX9790A. See the Evaluating the MAX9790A section
for more details.
Windows Vista is a trademark of Microsoft Corp.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
REQUIRED COMPONENTS
MAX9789AETJ+
(32-pin TQFN, 5mm x 5mm x 0.8mm)
MAX9789A EV kit PCB
U1
—
1
1
1.0µF 10ꢀ, 6.3V X5R ceramic
capacitors (0402)
C1, C2, C3, C9,
C11–C14
8
1
2
2
3
2
TDK C1005X5R0J105K
OPTIONAL COMPONENTS
10µF 20ꢀ, 6.3V X5R ceramic
capacitor (0805)
TDK C2012X5R0J106M
Not installed, ceramic capacitor
(0402)
C19
1
7
C4
C5, C6
J1–J4, J6, J7,
J8
1.0µF 10ꢀ, 10V X7R ceramic
capacitors (0603)
3-pin headers
J5
J9
R1
R2
—
1
1
1
1
8
2-pin header
TDK C1608X7R1A105K
3.5mm stereo jack
47kΩ 1ꢀ resistor (0402)
27kΩ 1ꢀ resistor (0402)
Shunts
1.0µF 10ꢀ, 25V X7R ceramic
capacitors (1206)
C7, C8
TDK C3216X7R1E105K
0.1µF 10ꢀ, 10V X5R ceramic
capacitors (0402)
TDK C1005X5R1A104K
C10, C15, C17
C16*, C18*
*System-level requirement.
+Denotes lead-free package.
33µF 20ꢀ, 6.3V X5R ceramic
capacitors (1206)
TDK C3216X5R0J336M
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.
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