Rainbow Electronics MAX9768 - Manual

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 8
Ω
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.
Applications
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 = 8 Ω, 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
10W Mono Class D Speaker
Amplifier with Volume Control
________________________________________________________________ Maxim Integrated Products 1
19-0854; Rev 0; 9/07
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.
EVALUATION KIT
AVAILABLE
Pin Configuration located at end of data sheet.
Ordering Information
Note: All devices are specified over the -40°C to +85°C oper-
ating temperature range.
+
Denotes lead-free package.
* EP = Exposed pad.
PART PIN-PACKAGE t ON (ms)
PKG
CODE
MAX9768ETG+ 24 TQFN-EP* 220 T2444+4
MAX9768BETG+ 24 TQFN-EP* 15 T2444+4
MUTE
SHDN
SPEAKER
AUDIO
INPUT
FILTERLESS
CLASS D
SPEAKER
OUTPUT
ANALOG OR
I 2 C VOLUME
CONTROL
3.3V 4.5V TO 14V
MAX9768
Simplified Block Diagram
MAX9768 EMI WITH FERRITE BEAD FILTERS
(V DD = 12V, 1m CABLE, 8 Ω LOAD)
FREQUENCY (MHz)
900 800 100 200 300 500 600 400 700
5
10
15
20
AMPLITUDE (dB
μ
V/m) 25
30
35
40
0
0 1000
OVER 20dB MARGIN
TO EN55022B LIMIT
Notebook Computers
Flat-Panel Displays
Multimedia Monitors
GPS Navigation
Systems
Security/Personal
Mobile Radio