Rainbow Electronics MAX9758 - Manual

General Description
The MAX9756/MAX9757/MAX9758 combine dual, 2.3W,
bridge tied load (BTL) stereo audio power amplifiers and
a DirectDrive
TM headphone amplifier in a single device.
These devices feature single-supply voltage operation,
shutdown mode, logic-selectable gain, a headphone
sense input, a 31-step analog volume control, and indus-
try-leading click-and-pop suppression. The headphone
amplifier uses Maxim’s patent-pending DirectDrive archi-
tecture that produces a ground-referenced output from a
single supply, eliminating the need for large DC-blocking
capacitors.
The MAX9756/MAX9757 feature automatic level control
(ALC) that automatically limits output power to the speak-
er in the event of an overpowered output.
The MAX9756/MAX9758s’ 150mA internal linear regula-
tor provides a complete solution for DAC- or CODEC-
based designs.
The MAX9756/MAX9757/MAX9758 are offered in space-
saving, thermally efficient 32-pin (5mm x 5mm x 0.8mm)
and 36-pin thin QFN (6mm x 6mm x 0.8mm) packages.
All devices are specified over the extended -40°C to
+85°C temperature range.
Features
♦ Automatic Level Control—Protects Speakers
♦ Analog Volume Control
♦ 120mW DirectDrive Headphone Amplifiers (16Ω)
♦ 150mA Adjustable LDO
♦ Class AB, 2.3W, Stereo BTL Speaker Amplifiers
(3
Ω)
♦ High 95dB PSRR
♦ Low-Power Shutdown Mode
♦ Industry-Leading Click-and-Pop Suppression
♦ Short-Circuit and Thermal Protection
♦ Beep Input
MAX9756/MAX9757/MAX9758
2.3W Stereo Speaker Amplifiers and DirectDrive
Headphone Amplifiers with Automatic Level Control
________________________________________________________________ Maxim Integrated Products 1
VOL
ALC
SINGLE SUPPLY 4.5V TO 5.5V SINGLE SUPPLY 4.5V TO 5.5V SINGLE SUPPLY 4.5V TO 5.5V
1.2V TO 5V
HPS
BEEP
MAX9756
LDO
ALC
VOL
ALC
HPS
BEEP
MAX9757
ALC
VOL
1.2V TO 5V
HPS
BEEP
MAX9758
LDO
Simplified Block Diagrams
Ordering Information
Applications
PART ALC LDO PIN-PACKAGE
MAX9756ETX+ √ √ 36 Thin QFN-EP**
MAX9757ETJ+* √ — 32 Thin QFN-EP**
MAX9758ETJ+* — √ 32 Thin QFN-EP**
19-3782; Rev 0; 8/05
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.
EVALUATION KIT
AVAILABLE
Notebook PCs
Tablet PCs
Portable DVD
Players
Flat-Panel TVs
PC Displays
LCD Projectors
Portable Audio
Note: All devices specified for -40°C to +85°C operating
temperature range.
+Denotes lead-free package.
*Future product—contact factory for availability.
**EP = Exposed paddle.