MAX9779ETI+ Maxim Integrated Products, MAX9779ETI+ Datasheet

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MAX9779ETI+

Manufacturer Part Number
MAX9779ETI+
Description
IC AMP AUDIO PWR 2.6W AB 28TQFN
Manufacturer
Maxim Integrated Products
Series
DirectDrive™r
Type
Class ABr
Datasheet
1.MAX9779ETI.pdf (19 pages)

Specifications of MAX9779ETI+

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
Mounting Type
Surface Mount
Package / Case
28-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9779 combines a stereo, 2.6W audio power
amplifier and stereo DirectDrive™ 110mW headphone
amplifier in a single device. The headphone amplifier
uses Maxim’s DirectDrive architecture that produces a
ground-referenced output from a single supply, eliminat-
ing 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 through the Class AB
speaker amplifiers.
The MAX9779 features a single-supply voltage, a shut-
down mode, logic-selectable gain, and a headphone
sense input. Industry-leading click-and-pop suppres-
sion eliminates audible transients during power and
shutdown cycles.
The MAX9779 is offered in a space-saving, thermally effi-
cient 28-pin thin QFN (5mm x 5mm x 0.8mm) package.
The device has thermal-overload and output short-circuit
protection, and is specified over the extended -40°C to
+85°C temperature range.
19-3766; Rev 0; 7/05
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.
Notebook PCs
Tablet PCs
Portable DVD Players LCD Projectors
MAX9779
GAIN
Simplified Block Diagram
________________________________________________________________ Maxim Integrated Products
2.6W Stereo Audio Power Amplifier and
General Description
AB
AB
Flat-Panel TVs
Multimedia Monitors
Applications
DirectDrive Headphone Amplifier
♦ 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-Overload Protection
♦ Selectable Gain Settings (15dB, 16.5dB, 18dB,
♦ ±8kV ESD-Protected Headphone Driver Outputs
♦ Available in Space-Saving, Thermally Efficient
+
*EP = Exposed paddle.
Pin Configuration appears at end of data sheet.
MAX9779ETI
Denotes lead-free package.
Industry’s Most Compact Notebook Audio
Solution
and 19.5dB)
Package
28-Pin Thin QFN (5mm x 5mm x 0.8mm)
PART
+
-40°C to +85°C
TEMP RANGE
Ordering Information
PIN-PACKAGE
28 Thi n QFN - E P *
Features
1

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MAX9779ETI+ Summary of contents

Page 1

... Portable DVD Players LCD Projectors Simplified Block Diagram AB AB MAX9779 GAIN ________________________________________________________________ Maxim Integrated Products 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. DirectDrive Headphone Amplifier ♦ No DC-Blocking Capacitors Required—Provides Industry’s Most Compact Notebook Audio Solution ♦ ...

Page 2

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier 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 Amplifier and ELECTRICAL CHARACTERISTICS (continued) = 5V, GND = PGND = CPGND = 0V, SHDN = CPV = HPV terminated between OUT_+ and OUT_-, headphone load terminated ...

Page 4

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier ELECTRICAL CHARACTERISTICS (continued) = 5V, GND = PGND = CPGND = 0V, SHDN = CPV = HPV terminated between OUT_+ and OUT_-, ...

Page 5

Stereo Audio Power Amplifier and (Measurement BW = 22Hz to 22kHz TOTAL HARMONIC DISTORTION PLUS NOISE vs. FREQUENCY (SPEAKER MODE 3Ω OUTPUT POWER = 1.5W 0.1 0.01 OUTPUT ...

Page 6

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier (Measurement BW = 22Hz to 22kHz, T CROSSTALK vs. FREQUENCY (SPEAKER MODE - 200mV RIPPLE P-P - 4Ω L -30 -40 -50 ...

Page 7

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

Page 8

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier (Measurement BW = 22Hz to 22kHz OUTPUT POWER vs. CHARGE-PUMP CAPACITANCE AND LOAD RESISTANCE 200 180 160 140 120 2.2µF 100 ...

Page 9

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier PIN NAME 1 INL Left-Channel Audio Input 2 N.C. No Connection. Not internally connected PGND Power Ground 4 OUTL+ Left-Channel Positive Speaker Output 5 OUTL- Left-Channel Negative Speaker Output ...

Page 10

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier IN_ BIAS BIAS BIAS GND Figure 1. MAX9779 Signal Path Detailed Description The MAX9779 combines a 2.6W BTL speaker amplifier and a 110mW DirectDrive headphone amplifier with integrated headphone sensing and ...

Page 11

Stereo Audio Power Amplifier and allows the MAX9779 headphone amplifier output to be biased about GND, almost doubling the dynamic range while operating from a single supply. With no DC compo- nent, there is no need for the large ...

Page 12

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier 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 Headphone Sense Input (HPS) The ...

Page 13

Stereo Audio Power Amplifier and Table 1. MAX9779 Maximum Gain Settings GAIN2 GAIN1 Headphone Amplifier In conventional single-supply headphone amplifiers, the output-coupling capacitor is a major contributor of audible clicks and ...

Page 14

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier 1000 16Ω L 100 A = 3dB V 10 OUTPUTS IN PHASE 1 0.1 0.01 OUTPUTS 180° OUT OF PHASE 0.001 ...

Page 15

Stereo Audio Power Amplifier and Table 2. Suggested Capacitor Manufacturers SUPPLIER PHONE Taiyo Yuden 800-348-2496 TDK 807-803-6100 BIAS is the output of the internally generated DC bias voltage. The BIAS bypass capacitor, C PSRR and THD+N by reducing power ...

Page 16

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier For example, when compared to a 0Ω trace, a 100mΩ trace reduces the power delivered to a 4Ω load from 2.1W to 2W. Large output, supply, and GND traces also improve ...

Page 17

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier Pin Configuration TOP VIEW SHDN 22 GAIN2 23 GAIN1 24 MAX9779 GND 26 INR 27 GND ...

Page 18

Stereo Audio Power Amplifier and DirectDrive Headphone Amplifier (The package drawing(s) in this data sheet may not reflect the most current specifications. For the latest package outline information www.maxim-ic.com/packages.) D D/2 MARKING XXXXX PIN # 1 I.D. ...

Page 19

... 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. Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 ____________________ 19 © 2005 Maxim Integrated Products ...

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