19-3882; Rev 0; 10/05
2.2W Stereo Audio Power Amplifier
with Analog Volume Control
General Description
Features
♦ Class AB, 2.2W, Stereo BTL Speaker Amplifiers
♦ Analog Volume Control
The MAX9787 combines a stereo, 2.2W audio power
amplifier with an analog volume control in a single device.
A high 90dB PSRR and low 0.01% THD+N ensures clean,
low-distortion amplification of the audio signal.
♦ BEEP Input with Glitch Filter
♦ 5V Single-Supply Operation
The analog volume control can be driven with a poten-
tiometer, an RC-filtered PWM source, or a DAC output.
A BEEP input allows the addition of alert signals from
the controller to the audio path.
♦ High 90dB PSRR
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Low 0.01% THD+N at 1kHz
Industry-leading, click-and-pop suppression eliminates
audible transients during power and shutdown cycles.
Other features include single-supply voltage, a shut-
down mode, logic-selectable gain, thermal-overload,
and output short-circuit protection.
♦ Short-Circuit and Thermal Protection
♦ Selectable-Gain Settings
♦ Space-Saving 28-Pin TQFN (5mm x 5mm x 0.8mm)
The MAX9787 is offered in a space-saving, thermally
efficient, 28-pin, thin QFN (5mm x 5mm x 0.8mm) pack-
age, and is specified over the extended -40°C to +85°C
temperature range.
Applications
Ordering Information
Portable DVD Players
Notebook PCs
Flat-Panel TVs
Tablet PCs
PART
PIN-PACKAGE
PKG CODE
LCD Projectors
MAX9787ETI+
28 TQFN-EP*
T2855N-1
Multimedia Monitors
Note: This device is specified for -40°C to +85°C operation.
+Denotes lead-free package.
*EP = Exposed paddle.
PC Displays
Typical Operating Circuit
Pin Configuration
TOP VIEW
+5V
21 20
19 18
17 16
15
SHDN 22
GAIN2 23
GAIN1 24
14 N.C.
13 N.C.
Σ
12
V
SS
MAX9787
V
25
11 CPV
10 C1N
DD
SS
Σ
GND 26
INR 27
VOL 28
9
8
CPGND
C1P
BEEP
*EP
MAX9787
VOLUME
+
1
2
3
4
5
6
7
THIN QFN
*EXPOSED PAD.
________________________________________________________________ Maxim Integrated Products
1
For pricing, delivery, and ordering information, please contact Maxim/Dallas Direct! at
1-888-629-4642, or visit Maxim’s website at www.maxim-ic.com.