MAX9791AETI+T Maxim Integrated Products, MAX9791AETI+T Datasheet

IC AMP AUDIO 2.2W STER D 28TQFN

MAX9791AETI+T

Manufacturer Part Number
MAX9791AETI+T
Description
IC AMP AUDIO 2.2W STER D 28TQFN
Manufacturer
Maxim Integrated Products
Series
DirectDrive™r
Type
Class Dr
Datasheet
1.MAX9791AETI.pdf (34 pages)

Specifications of MAX9791AETI+T

Output Type
2-Channel (Stereo) with Stereo Headphones and Subwoofer
Max Output Power X Channels @ Load
2.2W x 2 @ 4 Ohm; 180mW x 2 @ 32 Ohm
Voltage - Supply
4.5 V ~ 5.5 V
Features
Depop, LDO, 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 MAX9791 combines a stereo 2W Class D power
amplifier, a stereo 180mW DirectDrive
amplifier, and a 120mA low-dropout (LDO) linear regu-
lator in a single device. The MAX9792 combines a
mono 3W Class D power amplifier, a stereo 180mW
DirectDrive headphone amplifier, and a 120mA LDO
linear regulator in a single device.
The MAX9791/MAX9792 feature Maxim’s DirectDrive
headphone amplifier architecture that produces a
ground-referenced output from a single supply, eliminat-
ing the need for large DC-blocking capacitors, saving
cost, board space, and component height. High 107dB
DC PSRR and low 0.006% THD+N ensure clean, low-
distortion amplification of the audio signal.
The ground sense feature senses and corrects for the
voltage difference between the output jack ground and
device signal ground. This feature minimizes head-
phone amplifier crosstalk by sensing the impedance in
the ground return trace and correcting for it at the out-
put jack. This feature also minimizes ground-loop noise
when the output socket is used as a line out connection
to other grounded equipment (for example, a PC con-
nected to a home hi-fi system).
The MAX9791/MAX9792 feature low RF susceptibility,
allowing the amplifiers to successfully operate in close
proximity to wireless applications. The MAX9791/
MAX9792 Class D amplifiers feature Maxim’s spread-
spectrum modulation and active emissions limiting cir-
cuitry. Industry-leading click-and-pop suppression
eliminates audible transients during power-up and shut-
down cycles.
The MAX9791/MAX9792 wake-on-beep feature wakes
up the speaker and headphone amplifiers when a qual-
ified beep signal is detected at the BEEP input.
For maximum flexibility, separate speaker and head-
phone amplifier control inputs provide independent
shutdown of the speaker and headphone amplifiers.
Additionally the LDO can be enabled independently of
the audio amplifiers.
The MAX9791/MAX9792 feature thermal-overload and
output short-circuit protection. The devices are avail-
able in 28-pin TQFN packages and are specified over
the -40°C to +85°C extended temperature range.
19-4217; Rev 1; 6/10
DirectDrive is a registered trademark of Maxim Integrated
Products, Inc.
Windows Vista is a registered trademark of Microsoft Corp.
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.
Amplifiers with DirectDrive Headphone Amplifiers
Notebook Computers
Tablet PCs
Portable Multimedia Players
Windows Vista-Compliant Class D Speaker
________________________________________________________________ Maxim Integrated Products
General Description
Applications
®
headphone
o Windows Vista® Premium Compliant
o Low EMI Filterless Class D Speaker Amplifiers
o 180mW DirectDrive Headphone Amplifier
o Excellent RF Immunity
o Integrated 120mA LDO
o Eliminates Headphone Ground Loop Noise
o Wake-on-Beep Function
o Click-and-Pop Suppression
o Short-Circuit and Thermal-Overload Protection
o Thermally Efficient, Space-Saving Package
Note: All devices are specified over the -40°C to +85°C
extended temperature range.
+ Denotes a lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
MAX9791AETI+
MAX9791BETI+
MAX9791CETI+
MAX9792AETI+
MAX9792CETI+
Simplified Block Diagrams continued at end of data sheet.
Pass EN55022B Emissions Limit with 30cm of
Speaker Cable
28-Pin TQFN-EP (4mm x 4mm x 0.75mm)
PART
Simplified Block Diagrams
SPEAKER AND LDO
MAX9791
SPKR_EN
2.7V TO 5.5V
HP_EN
LDO_EN
BEEP
SUPPLY
STEREO/
MONO
Stereo
Stereo
Stereo
Mono
Mono
Ordering Information
HEADPHONE SUPPLY
2.7V TO 5.5V
AVDD
LDO
CLASS D
CLASS D
AMP
AMP
OUTPUT
4.75V
4.75V
LDO
3.3V
1.8V
1.8V
1.8V, 3.3V, OR 4.75V
PIN-PACKAGE
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
28 TQFN-EP*
Features
1

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MAX9791AETI+T Summary of contents

Page 1

... Portable Multimedia Players DirectDrive is a registered trademark of Maxim Integrated Products, Inc. Windows Vista is a registered trademark of Microsoft Corp. ________________________________________________________________ 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. o Windows Vista® Premium Compliant ® ...

Page 2

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ABSOLUTE MAXIMUM RATINGS Supply Voltage (AVDD, PVDD, HPVDD to GND)........................-0.3V to +6.0V (AVDD to PVDD) .............................................................±0.3V GND to PGND, CPGND ......................................................±0.3V CPVSS, C1N to GND ............................................-6. 0.3V HPL, ...

Page 3

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V, V AVDD PVDD HPVDD GND = ∞, unless otherwise specified 1µ ...

Page 4

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V, V AVDD PVDD HPVDD GND = ∞, unless otherwise specified 1µ ...

Page 5

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V, V AVDD PVDD HPVDD GND = ∞, unless otherwise specified 1µ ...

Page 6

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ELECTRICAL CHARACTERISTICS (continued 5V, V AVDD PVDD HPVDD GND = ∞, unless otherwise specified 1µ ...

Page 7

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 8

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 9

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 10

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 11

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 12

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 13

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 14

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 15

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 16

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers ( 5V, V AVDD PVDD HPVDD GND erwise specified 20kΩ (A IN1 VSPKR = +25°C, unless otherwise noted. Speaker mode: SPKR_EN = 0, ...

Page 17

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers PIN NAME 1 SPKR_INL Left-Channel Speaker Amplifier Input 2 HP_INR Right-Channel Headphone Amplifier Input 3 HP_INL Left-Channel Headphone Amplifier Input 4 COM Common-Mode Voltage Sense Input 5 GND Signal Ground. ...

Page 18

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers PIN NAME 1, 5 GND Signal Ground. Star connect to PGND. 2 HP_INR Right-Channel Headphone Amplifier Input 3 HP_INL Left-Channel Headphone Amplifier Input 4 COM Common-Mode Voltage Sense Input 6 ...

Page 19

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers Table 1. Windows Premium Mobile Vista Specifications vs. MAX9791/MAX9792 Specifications DEVICE TYPE REQUIREMENT THD+N Analog Line-Out Jack Dynamic range with signal (R = 10kΩ present 0.707V ) ...

Page 20

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers CLASS D EMI PLOT 40 EN55022B LIMIT 100 FREQUENCY (MHz) Figure 2. EMI with 30cm of Speaker Cable In addition to active ...

Page 21

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers R FHP C IN2 HP_INL R IN2 C COM R FHP COM R COM C IN2 HP_INR R IN2 R FHP Figure 4. Connecting COM for Ground Sense Common-Mode Sense ...

Page 22

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers A qualified BEEP signal consists of a 3.3V typical, 215Hz minimum signal that is present at BEEP for four consecutive cycles. Once the first rising edge transition is detected at ...

Page 23

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers MAX9791 MAX9792 SINGLE SPKR_EN CONTROL HP_EN Figure 8. Enabling Either the Speaker or Headphone Amplifier with a Single Control Pin Click-and-Pop Suppression The MAX9791/MAX9792 feature a common-mode bias voltage of ...

Page 24

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers Setting Speaker Amplifier Gain External input resistors in conjunction with the internal feedback resistors (R ) set the speaker amplifier FSPKR gain of the MAX9791/MAX9792. Set gain by using resistor ...

Page 25

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers INPUT COUPLING CAPACITOR-INDUCED THD+N vs. FREQUENCY (HEADPHONE MODE) -50 0402 6.3V X5R 10% 1µF -60 -70 0603 10V X5R 10% 1µF -80 0805 50V X7R 10% 1µF -90 0603 10V ...

Page 26

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers Charge-Pump Output Capacitor (C2) Connect a 1µF capacitor between CPVSS and PGND. LDO Output Capacitor (CLDO) Connect 2 x 1µF capacitors between LDO_OUT and GND for 4.75V and 3.3V LDO ...

Page 27

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers TOP VIEW HP_EN 22 PGND 23 24 OUTR+ 25 OUTR- MAX9791 26 PVDD 27 SPKR_EN + 28 SPKR_INR TQFN (4mm x 4mm ...

Page 28

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers 1.0µF C IN3 R IN3 C RIN1 IN1 SPKR_INL CIN1 RIN1 SPKR_INR C R IN3 IN3 C IN2 R IN2 HP_INL IN2 IN2 HP_INR 2 2.7V TO ...

Page 29

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers 1.0µF C IN3 R IN3 C RIN1 IN1 SPKR_INL CIN1 RIN1 SPKR_INR C R IN3 IN3 C IN2 R IN2 HP_INL 3 C IN2 R IN2 HP_INR 2 2.7V TO ...

Page 30

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers 1.0µF C IN3 R IN3 C RIN1 IN1 SPKR_IN C IN2 R IN2 HP_INL 3 C IN2 R IN2 HP_INR 2 2.7V TO 5.5V LDO_EN 8 HP_EN 22 BEEP 21 ...

Page 31

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers 1.0µF C IN3 R IN3 C RIN1 IN1 SPKR_IN C IN2 R IN2 HP_INL 3 C IN2 R IN2 HP_INR 2 2.7V TO 5.5V LDO_EN 8 HP_EN 22 BEEP 21 ...

Page 32

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may ...

Page 33

Windows Vista-Compliant Class D Speaker Amplifiers with DirectDrive Headphone Amplifiers For the latest package outline information and land patterns www.maxim-ic.com/packages. Note that a “+”, “#”, or “-” in the package code indicates RoHS status only. Package drawings may ...

Page 34

... 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. 34 ____________________Maxim Integrated Products, 120 San Gabriel Drive, Sunnyvale, CA 94086 408-737-7600 © 2010 Maxim Integrated Products DESCRIPTION Maxim is a registered trademark of Maxim Integrated Products, Inc ...

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