MAX9750AETI+ Maxim Integrated Products, MAX9750AETI+ Datasheet

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MAX9750AETI+

Manufacturer Part Number
MAX9750AETI+
Description
IC AMP AUDIO PWR 2.6W AB 28TQFN
Manufacturer
Maxim Integrated Products
Series
DirectDrive™r
Type
Class ABr
Datasheet
1.MAX9750AEUI.pdf (30 pages)

Specifications of MAX9750AETI+

Output Type
2-Channel (Stereo) with Stereo Headphones
Max Output Power X Channels @ Load
2.6W x 2 @ 3 Ohm; 110mW x 2 @ 16 Ohm
Voltage - Supply
4.5 V ~ 5.5 V
Features
Depop, Short-Circuit and Thermal Protection, Shutdown, Volume Control
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
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 DirectDrive architec-
ture 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 a
space-saving, thermally efficient 28-pin thin QFN (5mm
x 5mm x 0.8mm) package. These devices have thermal-
overload and output short-circuit protection, and are
specified over the extended -40°C to +85°C tempera-
ture range.
19-3006; Rev 8; 6/08
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.
Simplified Block Diagrams continued at end of data sheet.
Notebook PCs
Tablet PCs
Portable DVD Players LCD Projectors
MAX9750
BEEP
Simplified Block Diagrams
VOL
________________________________________________________________ Maxim Integrated Products
2.6W Stereo Audio Power Amplifiers and
General Description
EVALUATION KIT
AVAILABLE
Flat-Panel TVs
PC Displays
DirectDrive Headphone Amplifiers
Applications
®
♦ No DC-Blocking Capacitors Required—Provides
♦ 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
+
* All devices specified over the -40°C to +85°C temperature
range.
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
MAX9750AETI
MAX9750BETI
MAX9750CETI
MAX9751ETI
MAX9755ETI
Denotes a lead-free/RoHS-compliant package.
Industry’s Most Compact Notebook Audio
Solution
28-Pin Thin QFN (5mm x 5mm x 0.8mm) Package
PART*
+
+
+
+
+
Ordering Information
PIN-
PACKAGE
28 Thi n QFN
28 Thi n QFN
28 Thi n QFN
28 Thi n QFN
28 Thi n QFN
M A XIM U M GA IN
Features
( d B )
13.5
19.5
10.5
10.5
10.5
1

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MAX9750AETI+ Summary of contents

Page 1

... Simplified Block Diagrams VOL BEEP MAX9750 Simplified Block Diagrams continued at end of data sheet. ________________________________________________________________ Maxim Integrated Products 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. ♦ No DC-Blocking Capacitors Required—Provides ® Industry’s Most Compact Notebook Audio Solution ♦ ...

Page 2

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ABSOLUTE MAXIMUM RATINGS Supply Voltage ( HPV , CPV GND to PGND.....................................................................±0.3V CPV , C1N GND .........................-6.0V to (GND + 0.3V ...

Page 3

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued CPV = HPV = 5V terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND ...

Page 4

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued CPV = HPV = 5V terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND ...

Page 5

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued CPV = HPV = 5V terminated between OUT_+ and OUT_-, headphone load terminated between HPOUT_ and GND ...

Page 6

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE 3Ω 10.5dB V 1 ...

Page 7

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz OUTPUT POWER vs. LOAD RESISTANCE (SPEAKER MODE) 3.5 3.0 THD+N = 10% 2.5 2.0 THD 1.5 1.0 0 ...

Page 8

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz TURN-OFF RESPONSE (SPEAKER MODE) SHDN OUT_+ AND OUT_- OUT_+ - OUT_ 8Ω L 20ms/div TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY ...

Page 9

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER (HEADPHONE MODE) 1000 32Ω L 100 A = 3dB ...

Page 10

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers (Measurement BW = 22Hz to 22kHz HEADPHONE OUTPUT SPECTRUM 0 -20 -40 -60 -80 -100 -120 -140 FREQUENCY (Hz) TURN-OFF RESPONSE (HEADPHONE MODE) SHDN HPOUT_ R ...

Page 11

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers PIN MAX9750 MAX9751 MAX9755 1 — — — ...

Page 12

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750 ONLY IN_ BIAS BIAS VOLUME VOL CONTROL BIAS GND Figure 1. MAX9750/MAX9751 Signal Path Detailed Description The MAX9750/MAX9751/MAX9755 combine a 2.6W BTL speaker amplifier and a 110mW DirectDrive headphone amplifier ...

Page 13

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers significant amount of DC current flows to the headphone, resulting in unnecessary power dissipation and possible damage to both headphone and headphone amplifier. Maxim’s DirectDrive architecture uses a charge pump to ...

Page 14

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers ADDITIONAL THD+N DUE TO DC-BLOCKING CAPACITORS 10 1 0.1 TANTALUM 0.01 0.001 ALUM/ELEC 0.0001 10 100 1k FREQUENCY (Hz) Figure 4. Distortion Contributed by DC-Blocking Capacitors parasitic bond wire and trace ...

Page 15

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 1. MAX9750 Maximum Gain Settings SPEAKER MODE GAIN (dB) GAIN2 GAIN1 MAX9750A 10 13.5 Table 2. MAX9751/MAX9755 Gain Settings SPEAKER ...

Page 16

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 3A. MAX9750A Volume Levels V (V) VOL GAIN1 = HPV * MIN MAX DD GAIN2 = 0 0 0.49 0.074 0.49 0.5673 0.160 0.5673 0.6447 ...

Page 17

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 3B. MAX9750B Volume Levels V (V) VOL HPV * MIN MAX DD 0 0.49 0.074 0.49 0.5673 0.160 0.5673 0.6447 0.183 0.6447 0.722 0.207 0.722 0.7994 ...

Page 18

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 3C. MAX9750C Volume Levels V (V) VOL HPV * MIN MAX DD 0 0.49 0.074 0.49 0.5673 0.160 0.5673 0.6447 0.183 0.6447 0.722 0.207 0.722 0.7994 ...

Page 19

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MAX9750A VOLUME CONTROL TRANSFER FUNCTION 20 GAIN1 = GAIN2 = SPEAKER MODE -10 -20 -30 -40 -50 HEADPHONE MODE -60 -70 -80 0 0.5 1.0 1.5 2.0 2.5 ...

Page 20

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers +1 -1 Figure 9. Bridge-Tied Load Configuration Applications Information BTL Speaker Amplifiers The MAX9750/MAX9751/MAX9755 feature speaker amplifiers designed to drive a load differentially, a con- figuration referred to as bridge-tied load ...

Page 21

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers Table 4. Suggested Capacitor Manufacturers SUPPLIER PHONE Taiyo Yuden 800-348-2496 TDK 807-803-6100 Thermal-overload protection limits total power dissipa- tion in these devices. When the junction temperature exceeds +160°C, the thermal-protection circuitry ...

Page 22

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers reduces both ripple and output resistance. Lower capacitance values can be used in systems with low maximum output power levels. See the Output Power vs. Charge-Pump Capacitance and Load Resistance graph ...

Page 23

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers MUX MAX9751 ______________________________________________________________________________________ Simplified Block Diagrams (continued) MAX9755 23 ...

Page 24

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers C IN 1μF INL LEFT-CHANNEL AUDIO INPUT C IN 1μF INR RIGHT-CHANNEL AUDIO INPUT BIAS C BIAS 1μF VOL GAIN1 V DD GAIN2 1μF 47kΩ BEEP SHDN ...

Page 25

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 0.1μF MAX9751 1μF INL1 LEFT CHANNEL AUDIO INPUT C INPUT IN 1μF INL2 2 MUX LEFT CHANNEL AUDIO INPUT C IN 1μF 27 INR1 RIGHT CHANNEL AUDIO INPUT ...

Page 26

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers C IN 1μF INL LEFT CHANNEL AUDIO INPUT C IN 1μF INR RIGHT CHANNEL AUDIO INPUT BIAS C BIAS 1μF GAIN V DD SHDN V DD CPV 5.5V ...

Page 27

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 1μF AUX_IN OUT CODEC 2kΩ MAX4060 BIAS 2kΩ μC 1μF IN+ 1μF IN 5.5V 1μF ______________________________________________________________________________________ System Diagrams 4. 5.5V 0.1μ HPV DD ...

Page 28

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers 1μF AUX_IN 2kΩ MAX4060 BIAS 2kΩ 1μF IN+ 1μF IN- 28 ______________________________________________________________________________________ System Diagrams (continued) 4.5V TO 5.5V 0.1μ 1μF INL1 CODEC INL2 MAX9751 1μF INR1 OUT INR2 ...

Page 29

Stereo Audio Power Amplifiers and DirectDrive Headphone Amplifiers TOP VIEW SHDN 22 GAIN2 23 GAIN1 GND 26 INR 27 VOL THIN QFN Package Information For the latest package ...

Page 30

... Maxim cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a Maxim product. No circuit patent licenses are implied. Maxim reserves the right to change the circuitry and specifications without notice at any time. 30 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2008 Maxim Integrated Products DESCRIPTION is a registered trademark of Maxim Integrated Products, Inc ...

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