MAX98309EWL [MAXIM]
Mono 1.4W Class AB Audio Amplifiers 2.5V to 5.5V Supply Operation; 1.4W单声道AB类音频放大器2.5V至5.5V电源工作
| 型号： | MAX98309EWL |
| 厂家： | 
MAXIM INTEGRATED PRODUCTS |
| 描述： | Mono 1.4W Class AB Audio Amplifiers 2.5V to 5.5V Supply Operation |
| 文件： | 总8页 (文件大小：691K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
19-5979; Rev 0; 7/11
Evaluates: MAX98309/MAX98310
Ordering Information appears at end of data sheet.
Component List
Component Suppliers
Note: Indicate that you are using the MAX98309 when contacting these component suppliers.
_________________________________________________________________ Maxim Integrated Products
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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.
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
Shutdown Mode (SHDN)
The EV kit features 2-pin jumper JU1 to control the active-
Quick Start
low shutdown input of the IC. Drive SHDN high to place
Recommended Equipment
the device in normal operation; drive SHDN low to place
the device in the low-power shutdown mode. See Table 1
for shunt positions.
•ꢀ MAX98309 EV kit
•ꢀ 2.5V to 5.5V DC supply
•ꢀ 8I speaker
Turn-On Time
The MAX98309/MAX98310 have excellent click-and-pop
performance with respect to the SHDN pin activation/
deactivation.
•ꢀ Mono audio signal source
Procedure
The 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.
Jumper JU2 demonstrates the IC’s selectable turn-on-
time feature for optimized click-and-pop performance.
Connect TON to GND for a 10ms turn-on time. Connect
TON to VDD for a 100ms turn-on time. See Table 2 for
selectable turn-on times.
1) Verify that shunts are installed as follows:
JU1: Pins 2-3 (device enabled)
JU2: Pins 1-2 (turn-on time of 100ms)
JU3: Installed (single-ended input)
The MAX98310 has a preset 5ms turn-on time.
Amplifier Gain
The EV kit provides resistors R1–R4 to externally set the
differential gain. The default gain is 1V/V or 0dB. Set the
gain of the amplifier as follows:
2) Connect the positive terminal of the power supply
to the VDD PCB pad on the EV kit. Connect the
negative terminal of the power supply to the GND
PCB pad on the EV kit.
R
F
A
=
4) Verify that the audio source output is disabled.
V
R
IN
5) Connect the single-ended mono audio source to the
IN phono jack or between the IN+ and IN- PCB pads
on the EV kit.
where A is the desired voltage gain, R is the value of
V
F
feedback resistors R2 and R4, and R is the value of
IN
input resistors R1 and R3.
6) Connect the speaker across the OUT+ and OUT-
test pads.
When evaluating the MAX98310, jumper JU2 controls
the GAIN input pin and selects the four internally fixed
differential gain options. See Table 2 for selectable gain
options.
7) Set the power-supply output to 3.7V.
8) Enable the power-supply output.
9) Enable the audio source.
Input Mode
Jumper JU3 provides the option to select between a
differential or single-ended input mode for the EV kit. See
Table 3 for jumper JU3 configurations.
10) Verify that the speaker is playing the audio source
signal.
Detailed Description of Hardware
The MAX98309 EV kit is a fully assembled and tested
circuit board that evaluates the MAX98309 mono 1.4W
Class AB audio amplifier. The amplifier gain can be set
through external resistors.
Table 1. Shutdown Mode (JU1)
SHUNT
DEVICE
OPERATION
SHDN PIN
POSITION
The EV kit can also evaluate the MAX98310 internally fixed
gain mono 1.4W Class AB audio amplifier. To evaluate
the MAX98310, remove R2 and R4, and replace R1 and
R3 with 0I resistors.
1-2
Connected to GND
Connected to VDD
Disabled
Enabled
2-3*
*Default position.
_________________________________________________________________ Maxim Integrated Products
2
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
Table 2. Turn-On Time (JU2)
TON PIN (MAX98309)
MAX98309
TURN-ON TIME (ms)
MAX98310
GAIN (dB)
SHUNT POSITION
GAIN PIN (MAX98310)
Connected to VDD
Connected to BIAS
Connected to GND
Unconnected
1-2*
1-3
100
N/A
10
0
9
3
6
1-4
Open
N/A
*Default position.
Table 3. Input Mode Setting (JU3)
SHUNT POSITION
IN- PCB PAD
INPUT MODE
Single-ended input
Differential input
Installed*
Connected to GND
Not installed
*Default position.
Connected to a user-supplied negative differential input
_________________________________________________________________ Maxim Integrated Products
3
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
Figure 1. MAX98309 EV Kit Schematic
_________________________________________________________________ Maxim Integrated Products
4
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
1.0’’
1.0’’
Figure 3. MAX98309 EV Kit PCB Layout—Component Side
Figure 2. MAX98309 EV Kit Component Placement Guide—
Component Side
1.0’’
Figure 4. MAX98309 EV Kit PCB Layout—GND Layer 2
_________________________________________________________________ Maxim Integrated Products
5
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
1.0’’
1.0’’
Figure 5. MAX98309 EV Kit PCB Layout—VDD Layer 3
Figure 6. MAX98309 EV Kit PCB Layout—Solder Side
_________________________________________________________________ Maxim Integrated Products
6
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
Ordering Information
PART
TYPE
MAX98309EVKIT#
EV Kit
#Denotes RoHS compliant.
_________________________________________________________________ Maxim Integrated Products
7
MAX98309 Evaluation Kit
Evaluates: MAX98309/MAX98310
Revision History
REVISION
NUMBER
REVISION
DATE
PAGES
DESCRIPTION
CHANGED
0
7/11
Initial release
—
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
8
©
2011 Maxim Integrated Products
Maxim is a registered trademark of Maxim Integrated Products, Inc.
相关型号：
MAX98309EWL+
Audio Amplifier, 2.7W, 1 Channel(s), 1 Func, PBGA9, 1 X 1 MM, 0.30 MM PITCH, ROHS COMPLIANT, WLP-9
MAXIM
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