Datasheet

Evaluates: MAX9737
MAX9737 Evaluation Kit
2 _______________________________________________________________________________________
Component List (continued)
DESIGNATION QTY DESCRIPTION
OUT+, OUT-, PC 3
PCB mini test points, 20mA
Keystone 5000
R1, R2 2 20kΩ ±1% resistors (0603)
R3, R4 2 0Ω ±5% resistors (0805)
R5, R6 2 15Ω ±5% resistors (1206)
R7 1 10kΩ ±5% resistor (0603)
DESIGNATION QTY DESCRIPTION
R8 1 100kΩ ±5% resistor (0603)
U1 1
Mono 7W Class D amplifier
(24 TQFN-EP*)
Maxim MAX9737ETJ+
— 1 PCB: MAX9737 Evaluation Kit+
* EP = Exposed pad.
Note: Indicate that you are using the MAX9737 when contacting these component suppliers.
Component Suppliers
SUPPLIER PHONE WEBSITE
Central Semiconductor Corp. 631-435-1110 www.centralsemi.com
Murata Electronics North America, Inc. 770-436-1300 www.murata-northamerica.com
Panasonic Corp. 800-344-2112 www.panasonic.com
SANYO Electric Co., Ltd. 619-661-6835 www.sanyodevice.com
Sumida Corp. 847-545-6700 www.sumida.com
TDK Corp. 847-803-6100 www.component.tdk.com
Quick Start
Recommended Equipment
Before beginning, the following equipment is needed:
• 8V to 28V, 5A DC power supply
• Audio source with volume control (e.g., CD player,
etc.)
•8Ω speaker
Procedure
The MAX9737 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.
1) Install a shunt across pins 1-2 of jumper JU2
(DVDD = 5V).
2) Install a shunt across jumper JU1 (MUTE = high,
output enabled).
3) Connect a speaker across the FOUT+ and FOUT-
PCB binding posts.
4) Connect the positive terminal of the power supply
to the VDD binding post and the power-supply
ground terminal to the PGND binding post.
5) Connect the output terminal of the audio source to
the IN RCA phono jack.
6) Turn on the audio source at minimum volume.
7) Turn on the power supply.
8) Gradually increase the audio source volume until
audio is heard through the loud speaker.
Detailed Description of Hardware
Gain-Setting Resistors
The MAX9737 EV kit features adjustable gain setting
through external resistors R1 and R2. The output stage
provides a fixed internal gain in addition to the external-
ly set input stage gain. The fixed output stage gain is
set at +13.6dB (4.8V/V). Set overall gain by using resis-
tors R1 and R2 as follows:
where A
V
is the desired voltage gain. Choose R2
between 10kΩ and 50kΩ. Choose R1 using the follow-
ing equation:
R
R
A
V
1
48 2
=
×.
A
R
R
VV
V
= −
⎛
⎝
⎜
⎞
⎠
⎟
48
2
1
.