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Rainbow Electronics MAX9755 User Manual

General description, Applications, Features

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General Description

The MAX9750/MAX9751/MAX9755 combine a stereo,
2.6W audio power amplifier and stereo DirectDrive
110mW headphone amplifier in a single device. The
headphone amplifier uses Maxim’s patented DirectDrive
architecture that produces a ground-referenced output
from a single supply, eliminating the need for large DC-
blocking capacitors, saving cost, space, and component
height. A high 90dB PSRR and low 0.01% THD+N
ensures clean, low-distortion amplification of the audio
signal.

The MAX9750 features an analog volume control, and a
BEEP input. The MAX9751 features a 2:1 input multiplexer,
allowing multiple audio sources to be selected. All devices
feature a single-supply voltage, a shutdown mode, logic-
selectable gain, and a headphone sense input. Industry-
leading click-and-pop suppression eliminates audible
transients during power and shutdown cycles.

The MAX9750/MAX9751/MAX9755 are offered in space-
saving, thermally efficient 28-pin thin QFN (5mm x 5mm
x 0.8mm) and 28-pin TSSOP packages. Both devices
have thermal-overload and output short-circuit protec-
tion, and are specified over the extended -40°C to +85°C
temperature range.

Applications

Notebook PCs

Flat-Panel TVs

Tablet PCs

PC Displays

Portable DVD Players LCD Projectors

Features

No DC-Blocking Capacitors Required—Provides

Industry’s Most Compact Notebook Audio
Solution

PC2001 Compliant

5V Single-Supply Operation

Class AB 2.6W Stereo BTL Speaker Amplifiers

110mW DirectDrive Headphone Amplifiers

High 90dB PSRR

Low-Power Shutdown Mode

Industry-Leading Click-and-Pop Suppression

Low 0.01% THD+N at 1kHz

Short-Circuit and Thermal Protection

Selectable Gain Settings

Analog Volume Control (MAX9750)

Beep Input with Glitch Filter (MAX9750)

2:1 Stereo Input MUX (MAX9751)

±8kV ESD-Protected Headphone Driver Outputs

Available in Space-Saving, Thermally Efficient

Packages

28-Pin Thin QFN (5mm x 5mm x 0.8mm)
28-Pin TSSOP

MAX9750/MAX9751/MAX9755

2.6W Stereo Audio Power Amplifiers and

DirectDrive Headphone Amplifiers

________________________________________________________________

Maxim Integrated Products

1

Ordering Information

19-3006; Rev 1; 2/04

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.

PART

TEMP RANGE

PIN-
PACKAGE

M A XIM U M

G A I N ( d B )

MAX9750

AETI

-40°C to +85°C

28 Thi n QFN

13.5

MAX9750AEUI*

-40°C to +85°C

28 TSSOP

13.5

MAX9750BETI

-40°C to +85°C

28 Thi n QFN

19.5

MAX9750BEUI*

-40°C to +85°C

28 TSSOP

19.5

MAX9750CETI

-40°C to +85°C

28 Thi n QFN

10.5

MAX9750CEUI*

-40°C to +85°C

28 TSSOP

10.5

MAX9751

ETI

-40°C to +85°C

28 Thi n QFN

10.5

MAX9751EUI*

-40°C to +85°C

28 TSSOP

10.5

MAX9755

AETI

-40°C to +85°C

28 Thi n QFN

10.5

MAX9755AEUI*

-40°C to +85°C

28 TSSOP

10.5

*Future product—contact factory for availability.

Lead-free package.

VOL

BEEP

MAX9750

Simplified Block Diagrams

Simplifed Block Diagrams continued at end of data sheet.