MAX9792AEVKIT+ [MAXIM]
Wake-on-Beep Function;
| 型号： | MAX9792AEVKIT+ |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Wake-on-Beep Function |
| 文件： | 总11页 (文件大小：295K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-4450; Rev 0; 2/09
MAX9792A Evaluation Kit
Evluates:MX792A
General Description
Features
The MAX9792A evaluation kit (EV kit) demonstrates the
MAX9792A IC, which combines a mono 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.
♦ No DC-Blocking Output Capacitors Required at
Headphone Output
♦ Speaker and Headphone Operation
Speaker: 3W Mono Class D Output
Headphone: 180mW Stereo DirectDrive Output
♦ Wake-on-Beep Function
♦ 120mA, 4.75V LDO
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 sup-
ply and an optional separate 2.7V to 5.5V headphone
supply. The EV kit is capable of delivering up to 3W into
a 3Ω speaker and 180mW into a 32Ω headphone load.
♦ Lead(Pb)-Free and RoHS Compliant
♦ Fully Assembled and Tested
Ordering Information
PART
TYPE
MAX9792AEVKIT+
EV Kit
+Denotes lead(Pb)-free and RoHS compliant.
Component List
DESIGNATION QTY
DESCRIPTION
DESIGNATION QTY
DESCRIPTION
OPTIONAL COMPONENTS
REQUIRED COMPONENTS
1µF 10ꢀ, 10V X7R ceramic
capacitors (0603)
Murata GRM188R71A105K
AVDD, HPVDD,
PGND,
C1, C5, C6,
C25–C28
7
3
3
3
5
Binding posts
SPOUT+,
SPOUT-
1µF 10ꢀ, 50V X7R ceramic
capacitors (0805)
Murata GRM21BR71H105K
C3, C4, C29
C7, C8, C9
C13, C14, C19,
C20, C23, C24,
C33
Not installed, ceramic capacitors
(0603)
0
0
0.1µF 10ꢀ, 16V X7R ceramic
capacitors (0603)
Murata GRM188R71C104K
Not installed, ceramic capacitor
(0805)
C16
10µF 10ꢀ, 10V X7R ceramic
capacitors (0805)
Murata GRM21BR71A106K
HPINL
1
2
White side-entry phono jack
Red side-entry phono jacks
C10, C30, C31
HPINR, SPIN
HPL, HPR,
PGND, SENSE,
SPO+, SPO-
R1
1
3
20kΩ 1ꢀ resistor (0603)
0
Not installed, small PCB test points
R3, R4, R13
40.2kΩ 1ꢀ resistors (0603)
Speaker and headphone amplifiers
with LDO (28 TQFN-EP*)
Maxim MAX9792AETI+
HPOUT
JU1, JU2, JU3
JU4, JU5
1
3
2
3.5mm stereo headphone jack
3-pin headers
U1
—
1
1
2-pin headers
PCB: MAX9792A Evaluation Kit+
Not installed, inductors (6.4mm x
6mm x 1.5mm)
L3, L4
0
*EP = Exposed pad.
R7, R8
R11, R12, R15
—
2
0
5
0Ω 5ꢀ resistors (0805)
Not installed, resistors (0603)
Shunts (JU1–JU5)
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
________________________________________________________________ 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.
MAX9792A Evaluation Kit
Component Supplier
SUPPLIER
PHONE
WEBSITE
Murata Electronics North America, Inc.
770-436-1300
www.murata-northamerica.com
Note: Indicate that you are using the MAX9792A when contacting this component supplier.
Quick Start
Required Equipment
Detailed Description of Hardware
The MAX9792A EV kit demonstrates the MAX9792A IC
in a 28-pin TQFN package with an exposed pad. The
IC combines a mono Class D amplifier, a stereo
DirectDrive headphone amplifier, and a 120mA, 4.75V
LDO for notebook, tablet PC, and portable media play-
er applications. The EV kit demonstrates Maxim’s
DirectDrive technology, which eliminates bulky DC-
blocking capacitors at the headphone amplifier output.
The MAX9792A IC features adjustable gain.
•
•
•
•
One 5V, 3A DC Supply
One 3Ω speaker
One stereo headphone
Two audio signal sources: one mono and another
stereo
Procedure
The MAX9792A EV kit is fully assembled and tested.
Follow the steps below to verify board operation.
Caution: Do not turn on the power supply until all
connections are completed.
The MAX9792A EV kit is configured for a 12dB speaker
amplifier gain and 0dB headphone amplifier gain. The
gains can be adjusted by modifying the corresponding
gain-setting resistors (R1, R3, and R4). R1 sets the
speaker amplifier gain while R3 and R4 set the head-
phone amplifier gain. The EV kit is designed to operate
from a 4.5V to 5.5V speaker supply providing 3A. To use
the LDO, AVDD must range from 4.9V to 5.5V. An
optional separate 2.7V to 5.5V headphone supply can
power the headphone amplifier. The EV kit is capable of
delivering up to 3W into a 3Ω speaker, 180mW into a
32Ω headphone load, and 120mA from the 4.75V LDO
output.
Evluates:MX792A
1) Verify that shunts are installed as follows:
JU1: Pins 2-3 (speaker amplifier enabled)
JU2: Pins 1-2 (headphone amplifier enabled)
JU3: Pins 1-2 (LDO enabled)
JU4: Installed (HPVDD connected to AVDD)
JU5: Installed (wake-on-beep function disabled)
2) Set the power-supply output to 5V.
3) Disable the power-supply output.
In applications where the speaker leads exceed
225mm, replace resistors R7 and R8 with surface-
mount 0805 ferrite beads and install surface-mount
0603 capacitors for C13 and C14. Refer to the Optional
Ferrite Bead Filter section of the MAX9791/MAX9792 IC
data sheet for more information. The speaker outputs
do not require an output filter as the MAX9792A relies
on the inherent inductance of the speaker coil and the
natural filtering of an attached speaker. For optimum
results, use a speaker with a series inductance > 10µH.
The EV kit layout shows an optional speaker output filter
for evaluation purposes only.
4) Connect the power-supply ground to the PGND
binding post and the power-supply positive output
to the AVDD binding post.
5) Verify that the audio source output is disabled.
6) Connect the stereo audio source’s right channel to
the HPINR phono jack and the left channel to the
HPINL phono jack.
7) Connect the mono audio source to the SPIN phono
jack.
8) Plug the headphone into the HPOUT headphone jack.
9) Connect the speaker across the SPOUT+ and
SPOUT- binding posts.
10) Enable the power-supply output.
11) Enable the audio sources.
12) Verify that the headphones and speakers are play-
ing the audio source signals.
2
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MAX9792A Evaluation Kit
Evluates:MX792A
Speaker/Headphone Amplifier Shutdown
Jumpers JU1 and JU2 enable or disable the speaker
amplifier (SPKR_EN) and headphone amplifier
(HP_EN), respectively. See Tables 1 and 2 for jumper
JU1 and JU2 configuration to shut down or enable the
respective amplifier.
Table 2. Headphone Amplifier (JU2)
SHUNT
POSITION
HEADPHONE
AMPLIFIER
HP_EN PIN
1-2*
2-3
Connected to AVDD
Enabled
Connected to PGND Disabled
LDO Shutdown
Jumper JU3 enables or disables the LDO (LDO_EN).
To use the LDO, AVDD must range between 4.9V and
5.5V. See Table 3 for jumper JU3 configuration to shut
down or enable the LDO.
*Default position.
Table 3. LDO (JU3)
SHUNT
POSITION
LDO_EN PIN
4.75V LDO
Optional Headphone Supply Configuration
Jumper JU4 configures the source for the headphone
power supply (HPVDD). To power HPVDD using AVDD,
install a shunt on jumper JU4. To use an optional sepa-
rate supply for HPVDD, do not install a shunt on jumper
JU4 and connect a 2.7V to 5.5V supply across the
HPVDD and PGND binding posts. See Table 4 for
jumper JU4 configuration.
1-2*
Connected to AVDD
Enabled
2-3
Connected to PGND Disabled
*Default position.
Table 4. Headphone Supply (JU4)
SHUNT
POSITION
HPVDD POWER-
SUPPLY SOURCE
HPVDD PIN
Wake-on-Beep
Jumper JU5 controls the MAX9792A EV kit’s wake-on-
beep feature. A qualified BEEP signal overrides HP_EN
and SPKR_EN enabling the speaker and headphone
amplifiers. Refer to the Wake-on-Beep section of the
MAX9791/MAX9792 IC data sheet for more information.
To use the wake-on-beep feature, remove the shunt
from jumper JU5, connect a user-supplied BEEP signal
across the BEEP and nearby PGND PCB pads. Note:
Do not leave the BEEP pin unconnected. The LDO must
be enabled to use the wake-on-beep feature. See Table
5 for jumper JU5 configuration.
Installed*
Connected to AVDD
AVDD supply
Connected to HPVDD Optional separate 2.7V
binding post
Not installed
to 5.5V supply
*Default position.
Table 5. Wake-on-Beep (JU5)
SHUNT
POSITION
WAKE-ON-BEEP
FEATURE
BEEP PIN
Installed*
Connected to PGND Disabled
Enabled with a user-
Table 1. Speaker Amplifier (JU1)
Connected to BEEP
PCB pad
supplied BEEP output;
the LDO must be
enabled (see Table 4)
Not installed
SHUNT
SPEAKER
SPKR_EN PIN
POSITION
AMPLIFIER
1-2
Connected to AVDD
Disabled
*Default position.
2-3*
Connected to PGND Enabled
*Default position.
_______________________________________________________________________________________
3
MAX9792A Evaluation Kit
Speaker and Headphone Gain Setting
The default gain-setting resistor (R1) configures the
speaker amplifier gain to 12dB, while the default gain-
setting resistors (R3 and R4) configure the headphone
amplifier gain to 0dB. The gain can be changed by
replacing these resistors with other surface-mount 0603
resistors. Use 1ꢀ tolerance resistors for optimum per-
formance. See Table 6 and the following equations to
select new gain-setting resistors in kilohms for the cor-
responding channel:
Table 6. Component Function
CHANNEL
Speaker
RIN
R1
Headphone right
Headphone left
R3
R4
⎛
⎞
20kΩ
RIN
kΩ = −4×
[
]
SPKR
⎜
⎟
A
⎝
⎠
VSPKR
where A
is the desired speaker voltage gain and
VSPKR
RIN
is the speaker amplifier’s input resistor (R1).
SPKR
⎛
⎞
40.2kΩ
RIN
kΩ = −
[
]
HP
⎜
⎟
A
⎝
⎠
VHP
where A
is the desired headphone voltage gain
VHP
Evluates:MX792A
and RIN
is the headphone amplifier input resistors
HP
(R3 or R4).
4
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MAX9792A Evaluation Kit
Evluates:MX792A
Figure 1. MAX9792A EV Kit Schematic
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5
MAX9792A Evaluation Kit
Evluates:MX792A
Figure 2. MAX9792A EV Kit Component Placement Guide—Component Side
6
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MAX9792A Evaluation Kit
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Figure 3. MAX9792A EV Kit PCB Layout—Component Side
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MAX9792A Evaluation Kit
Evluates:MX792A
Figure 4. MAX9792A EV Kit PCB Layout—Layer 2
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MAX9792A Evaluation Kit
Evluates:MX792A
Figure 5. MAX9792A EV Kit PCB Layout—Layer 3
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MAX9792A Evaluation Kit
Evluates:MX792A
Figure 6. MAX9792A EV Kit PCB Layout—Solder Side
10 ______________________________________________________________________________________
MAX9792A Evaluation Kit
Evluates:MX792A
Figure 7. MAX9792A EV Kit Component Placement Guide—Solder Side
Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are
implied. Maxim reserves the right to change the circuitry and specifications without notice at any time.
Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 11
© 2009 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
SPRINGER
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