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MAX9768BETG

Description
10W Mono Class D Speaker Amplifier with Volume Control
File Size336KB,25 Pages
ManufacturerMaxim
Websitehttps://www.maximintegrated.com/en.html
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10W Mono Class D Speaker Amplifier with Volume Control

19-0854; Rev 0; 9/07
10W Mono Class D Speaker
Amplifier with Volume Control
General Description
The MAX9768 mono 10W Class D speaker amplifier
provides high-quality, efficient audio power with an inte-
grated volume control function.
The MAX9768 features a 64-step dual-mode (analog or
digitally programmable) volume control and mute func-
tion. The audio amplifier operates from a 4.5V to 14V
single supply and can deliver up to 10W into an 8Ω
speaker with a 14V supply.
A selectable spread-spectrum mode reduces EMI-radiat-
ed emissions, allowing the device to pass EMC testing
with ferrite bead filters and cable lengths up to 1m. The
MAX9768 can be synchronized to an external clock,
allowing synchronization of multiple Class D amplifiers.
The MAX9768 features high 77dB PSRR, low 0.08%
THD+N, and SNR up to 97dB. Robust short-circuit and
thermal-overload protection prevent device damage
during a fault condition. The MAX9768 is available in a
24-pin thin QFN-EP (4mm x 4mm x 0.8mm) package
and is specified over the extended -40°C to +85°C tem-
perature range.
Features
10W Output (8Ω, PV
DD
= 14V, THD+N = 10%)
Patented Spread-Spectrum Modulation
Meets EN55022B EMC with Ferrite Bead Filters
Amplifier Operation from 4.5V to 14V Supply
64-Step Integrated Volume Control (I
2
C or Analog)
Low 0.08% THD+N (R
L
= 8Ω, P
OUT
= 6W)
High 77dB PSRR
Two t
ON
Times Offered
MAX9768—220ms
MAX9768B—15ms
Low-Power Shutdown Mode (0.5µA)
Short-Circuit and Thermal-Overload Protection
MAX9768
Ordering Information
PART
MAX9768ETG+
MAX9768BETG+
PIN-PACKAGE
24 TQFN-EP*
24 TQFN-EP*
t
ON
(ms)
220
15
PKG
CODE
T2444+4
T2444+4
Applications
Notebook Computers
Flat-Panel Displays
Multimedia Monitors
GPS Navigation
Systems
Security/Personal
Mobile Radio
Note:
All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+Denotes
lead-free package.
*EP
= Exposed pad.
Pin Configuration located at end of data sheet.
Simplified Block Diagram
3.3V
4.5V TO 14V
MAX9768 EMI WITH FERRITE BEAD FILTERS
(V
DD
= 12V, 1m CABLE, 8Ω LOAD)
40
35
AMPLITUDE (dBµV/m)
30
25
20
15
10
5
OVER 20dB MARGIN
TO EN55022B LIMIT
SPEAKER
AUDIO
INPUT
FILTERLESS
CLASS D
SPEAKER
OUTPUT
SHDN
MUTE
ANALOG OR
I
2
C VOLUME
CONTROL
MAX9768
0
0 100 200 300 400 500 600 700 800 900 1000
FREQUENCY (MHz)
________________________________________________________________
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.

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