MAX9728AETC+T Maxim Integrated Products, MAX9728AETC+T Datasheet

IC AMP AUDIO .06W STER AB 12TQFN

MAX9728AETC+T

Manufacturer Part Number
MAX9728AETC+T
Description
IC AMP AUDIO .06W STER AB 12TQFN
Manufacturer
Maxim Integrated Products
Series
DirectDrive™r
Type
Class ABr
Datasheet

Specifications of MAX9728AETC+T

Output Type
Headphones, 2-Channel (Stereo)
Max Output Power X Channels @ Load
60mW x 2 @ 32 Ohm
Voltage - Supply
4.5 V ~ 5.5 V
Features
Depop, Short-Circuit and Thermal Protection, Shutdown
Mounting Type
Surface Mount
Package / Case
12-TQFN Exposed Pad
Lead Free Status / RoHS Status
Lead free / RoHS Compliant
The MAX9728A/MAX9728B stereo headphone ampli-
fiers are designed for display and notebook applica-
tions or portable equipment where board space is at a
premium. These devices use a unique DirectDrive
architecture to produce a ground-referenced output
from a single supply, eliminating the need for large DC-
blocking capacitors, saving cost, board space, and
component height. The MAX9728A offers an externally
adjustable gain, while the MAX9728B has an internally
preset gain of -1.5V/V. The MAX9728A/MAX9728B
deliver up to 60mW per channel into a 32Ω load and
have low 0.02% THD+N. An 80dB at 1kHz power-sup-
ply rejection ratio (PSRR) allows these devices to oper-
ate from noisy digital supplies without an additional
linear regulator. Comprehensive click-and-pop circuitry
suppresses audible clicks and pops on startup and
shutdown.
The MAX9728A/MAX9728B operate from a single 4.5V
to 5.5V supply, consume only 3.5mA of supply current,
feature short-circuit and thermal-overload protection,
and are specified over the extended -40°C to +85°C
temperature range. The devices are available in tiny 12-
pin Thin QFN (3mm x 3mm x 0.8mm) and 14-pin
TSSOP packages (5mm x 4.4mm x 1.1mm).
19-3963; Rev 1; 7/09
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.
DirectDrive is a registered trademark of Maxim Integrated
Product, Inc.
Notebook PCs
DVD Players
LCD/PDP Displays
AUDIO
AUDIO
RIGHT
INPUT
INPUT
LEFT
SHDN
________________________________________________________________ Maxim Integrated Products
General Description
Headphone Amplifiers with Shutdown
MAX9728A
CRT TVs
Multimedia Monitors
Applications
ELIMINATE DC-BLOCKING
DirectDrive OUTPUTS
CAPACITORS
60mW, DirectDrive, Stereo
®
♦ No Bulky DC-Blocking Capacitors Required
♦ Low-Power Shutdown Mode, < 0.1µA
♦ Adjustable Gain (MAX9728A) or Fixed -1.5V/V
♦ Low 0.02% THD+N
♦ High PSRR (80dB at 1kHz) Eliminates LDO
♦ Integrated Click-and-Pop Suppression
♦ 4.5V to 5.5V Single-Supply Operation
♦ Low Quiescent Current (3.5mA)
♦ Available in Space-Saving Packages
Note: All devices specified over the -40°C to +85°C operating
range.
+ Denotes lead(Pb)-free/RoHS-compliant package.
* EP = Exposed pad.
Pin Configurations appear at end of data sheet.
MAX9728AETC+
MAX9728AEUD+
MAX9728BETC+
MAX9728BEUD+
Gain (MAX9728B)
AUDIO
AUDIO
INPUT
RIGHT
INPUT
SHDN
LEFT
12-Pin Thin QFN (3mm x 3mm x 0.8mm)
14-Pin TSSOP (5mm x 4.4mm x 1.1mm)
PART
GAIN (V/V) PIN-PACKAGE
MAX9728B
Adj.
Adj.
-1.5
-1.5
Ordering Information
12 TQFN-EP*
14 TSSOP
12 TQFN-EP*
14 TSSOP
Block Diagrams
FIXED GAIN ELIMINATES
ELIMINATE DC-BLOCKING
EXTERNAL RESISTOR
DirectDrive OUTPUTS
CAPACITORS
NETWORK
Features
TOP MARK
ABC
ABD
1

Related parts for MAX9728AETC+T

MAX9728AETC+T Summary of contents

Page 1

... AUDIO INPUT SHDN RIGHT AUDIO INPUT ________________________________________________________________ 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. 60mW, DirectDrive, Stereo ♦ No Bulky DC-Blocking Capacitors Required ♦ Low-Power Shutdown Mode, < 0.1µA ♦ Adjustable Gain (MAX9728A) or Fixed -1.5V/V ® ...

Page 2

DirectDrive, Stereo Headphone Amplifiers with Shutdown ABSOLUTE MAXIMUM RATINGS V to PGND............................................................-0. .........................................................-0.3V to +0. PGND to SGND .....................................................-0.3V to +0.3V C1P to PGND..............................................-0. C1N to PGND............................................(PV PV and ...

Page 3

DirectDrive, Stereo Headphone ELECTRICAL CHARACTERISTICS (continued) = 5V, PGND = SGND, SHDN = 5V 1µ 20kΩ 30kΩ); for MAX9728B gain = -1.5V/V (internally set are ...

Page 4

DirectDrive, Stereo Headphone Amplifiers with Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T TOTAL HARMONIC DISTORTION PLUS NOISE vs. OUTPUT POWER ...

Page 5

DirectDrive, Stereo Headphone = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T OUTPUT POWER vs. LOAD RESISTANCE 100 90 THD+N = 10% 80 ...

Page 6

DirectDrive, Stereo Headphone Amplifiers with Shutdown = 5V, PGND = SGND = 0V, SHDN = THD+N measurement bandwidth = 22Hz to 22kHz, both outputs driven in phase, T EXITING SHUTDOWN V SHDN 5V/div V IN_ 1V/div ...

Page 7

DirectDrive, Stereo Headphone Detailed Description The MAX9728A/MAX9728B stereo headphone ampli- fiers feature Maxim’s DirectDrive architecture, eliminat- ing the large output-coupling capacitors required by conventional single-supply headphone amplifiers. These devices consist of two 60mW Class AB head- phone amplifiers, undervoltage ...

Page 8

DirectDrive, Stereo Headphone Amplifiers with Shutdown Since the MAX9728A/MAX9728B do not require output- coupling capacitors, this problem does not arise. Additionally, the MAX9728A/MAX9728B feature exten- sive click-and-pop suppression that eliminates any audible transient sources internal to the device. Typically, ...

Page 9

DirectDrive, Stereo Headphone Charge-Pump Capacitor Selection Use ceramic capacitors with a low ESR for optimum performance. For optimal performance over the extend- ed temperature range, select capacitors with an X7R dielectric. Table 1 lists suggested manufacturers. Flying Capacitor (C1) ...

Page 10

DirectDrive, Stereo Headphone Amplifiers with Shutdown Lineout Amplifier and Filter Block The MAX9728A can be used as an audio line driver capable of providing 2V into 10kΩ loads with a sin- RMS gle 5V supply (see Figure 3 for ...

Page 11

DirectDrive, Stereo Headphone LEFT AUDIO INPUT STEREO DAC RIGHT AUDIO INPUT Figure 4. MAX9728A Line-Out Amplifier and Filter Block Configuration MAX9728A ACTIVE FILTER GAIN vs. FREQUENCY -10 -15 -20 -25 -30 -35 1k 10k 100k ...

Page 12

DirectDrive, Stereo Headphone Amplifiers with Shutdown μCONTROLLER STEREO DAC 12 ______________________________________________________________________________________ V DD 0.1μF 15kΩ 1μF 15kΩ INR OUTR OUTR- BIAS 1μF MAX9710 GND PGND MUTE OUTL- 0.1μF SHDN 15kΩ OUTL+ INL 15kΩ 100kΩ 0.1μF ...

Page 13

DirectDrive, Stereo Headphone 4.5V TO 5.5V C3 OFF 1μ (3) C1P SHUTDOWN CONTROL CHARGE C1 PUMP 1μF 3 (5) C1N PV SV PGND (7) (4) (12) C2 1μF *R ...

Page 14

DirectDrive, Stereo Headphone Amplifiers with Shutdown Functional Diagram/Typical Operating Circuits (continued) 4.5V TO 5.5V C3 1μ (3) C1P CHARGE C1 PUMP 1μF 3 (5) C1N (7) (12) C2 ...

Page 15

DirectDrive, Stereo Headphone TOP VIEW OUTR MAX9728A OUTL 11 MAX9728B TQFN ______________________________________________________________________________________ Amplifiers with Shutdown TOP VIEW 6 INL PGND 5 SHDN TRANSISTOR COUNT: 993 ...

Page 16

DirectDrive, Stereo Headphone Amplifiers with Shutdown 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 show a different ...

Page 17

DirectDrive, Stereo Headphone 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 show a different suffix character, but ...

Page 18

DirectDrive, Stereo Headphone Amplifiers with Shutdown 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 show a different ...

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 © 2009 Maxim Integrated Products ...

Related keywords